September 2025 OBS-Discussion centered NYC subforum

[SACRUS]

 

Highs
 

 

EWR: 83
PHL: 83
New Brnswck: 82
ISP: 82
TEB: 81
JFK: 81
TTN: 81
NYC: 81
LGA: 80
ACY: 79
BLM: 77

[Sundog]

The 18z GFS has tons of below normal temps for much of the run.  

I choose to believe it for no other reason than I simply like what it shows. 

[SACRUS]

 

 

Sep Dep's

ISP: +2.6
EWR: +2.4
TTN: +1.6
NYC: +1.3
JFK: +1.0
LGA: +0.6

[Sundog]

1 minute ago, SACRUS said:

 

 

Sep Dep's

EWR: +2.4
NYC: +1.3
JFK: +1.0
LGA: +0.6

The spread between LGA and Newark is pretty significant for a monthly anomaly no?

[psv88]

5 minutes ago, Sundog said:

The spread between LGA and Newark is pretty significant for a monthly anomaly no?

Lots of northeast winds this month. Makes sense 

[FPizz]

1 hour ago, Sundog said:

The spread between LGA and Newark is pretty significant for a monthly anomaly no?

Newarks temps are pristine and represent all of the tri-state.  All the others look too low and suspicious to me minus isp.  

[NorthShoreWx]

September 30 max here was 77° (76.6°).  Unusual spread with temps south of the LIE (must have been the wind off the sound).   ISP is less than 10 miles southeast of here.

The most recent temperatures in the 80s were on 9/26 and 9/28 (both 83°)

September rainfall here was 3.23"

Warmest for the month was 84° on the 9/6 and again on the 9/19.

September temperatures on the whole were similar to the last 2 weeks of August

Coolest was 49° on September 22.

[NorthShoreWx]

7 hours ago, Roger Smith said:

The 88 _ 90 _ 94 of Oct 4 to 6 1941 was the latest not quite a heatwave by official definitions, and mid-October 1954 had three in a row over 84 F. 

The wet September is a typo, it was actually 1882. And what caused it was mainly a slow-moving tropical storm (TS 4 of 1892) moving up the east coast 22nd to 24th. About three quarters of the month's massive total occurred in that time frame. The TS crossed Long Island with a landfall at Mastic Beach.  

2007 wasn't a heatwave, but it was a pretty warm run for early October.  Just missed 6 (arguably 7) consecutive 80° days.  Very warm nights too.  This is from Central Park:

Day	Max	Min	Rain
2007 10 01	69	59	0
2007 10 02	75	58	0
2007 10 03	78	65	0.03
2007 10 04	84	69	0
2007 10 05	83	67	0
2007 10 06	83	66	0
2007 10 07	82	67	0
2007 10 08	87	67	0
2007 10 09	79	60	0.52

[winterwarlock]

83

 

7th straight day of 80 and above

[donsutherland1]

Final September mean temperature in New York City: 70.6°

September 2025 had the second smallest standard deviation in temperatures for any September.

Lowest Standard Deviations:
1. 1968 3.43°
2. 2025 3.63°
3. 1870 3.81°
4. 2024 3.94°
5. 1908 4.08°

Standard Deviations in the New York City Area:

Bridgeport: 3.60° (old record: 3.72°, 2024)
Islip: 4.11° (3rd lowest)
New York City-Central Park: 3.63° (2nd lowest)
New York City-JFK Airport: 3.64° (2nd lowest)
New York City-LaGuardia Airport: 3.82° (2nd lowest)
Newark: 4.19° (3rd lowest)
White Plains: 4.02° (old record: 4.28°, 1968)

 

[bluewave]

12 hours ago, LibertyBell said:

This is weird even without any extreme heat it's the warmest week-- because of the elevated mins? I'd expect at least one or more heatwaves have occurred in the history of NYC in the last week of September.  

Several stations came within a few degrees of their warmest high for the last week of September.
 

Time Series Summary for SUSSEX AIRPORT, NJ
Click column heading to sort ascending, click again to sort descending.

1	2017-09-30	89	0
2	2014-09-30	88	0
-	2007-09-30	88	0
3	2025-09-30	87	0
4	2010-09-30	85	0
5	2018-09-30	82	0
-	2011-09-30	82	0

Time Series Summary for NEWARK LIBERTY INTL AP, NJ
Click column heading to sort ascending, click again to sort descending.

1	2017-09-30	92	0
-	1959-09-30	92	0
-	1881-09-30	92	0
2	1998-09-30	91	0
-	1970-09-30	91	0
3	2010-09-30	90	0
-	2007-09-30	90	0
-	1968-09-30	90	0
-	1958-09-30	90	0
-	1895-09-30	90	0
4	2025-09-30	89	0
-	1986-09-30	89	0
-	1945-09-30	89	0
-	1933-09-30	89	0

 

Time Series Summary for ISLIP-LI MACARTHUR AP, NY
Click column heading to sort ascending, click again to sort descending.

1	2017-09-30	89	0
2	2010-09-30	87	0
3	1998-09-30	86	0
4	2025-09-30	85	0
-	1970-09-30	85	0
5	2009-09-30	83	0
-	1972-09-30	83	0

[LibertyBell]

1 hour ago, bluewave said:

Several stations came within a few degrees of their warmest high for the last week of September.
 

Time Series Summary for SUSSEX AIRPORT, NJ
Click column heading to sort ascending, click again to sort descending.

1	2017-09-30	89	0
2	2014-09-30	88	0
-	2007-09-30	88	0
3	2025-09-30	87	0
4	2010-09-30	85	0
5	2018-09-30	82	0
-	2011-09-30	82	0

Time Series Summary for NEWARK LIBERTY INTL AP, NJ
Click column heading to sort ascending, click again to sort descending.

1	2017-09-30	92	0
-	1959-09-30	92	0
-	1881-09-30	92	0
2	1998-09-30	91	0
-	1970-09-30	91	0
3	2010-09-30	90	0
-	2007-09-30	90	0
-	1968-09-30	90	0
-	1958-09-30	90	0
-	1895-09-30	90	0
4	2025-09-30	89	0
-	1986-09-30	89	0
-	1945-09-30	89	0
-	1933-09-30	89	0

 

Time Series Summary for ISLIP-LI MACARTHUR AP, NY
Click column heading to sort ascending, click again to sort descending.

1	2017-09-30	89	0
2	2010-09-30	87	0
3	1998-09-30	86	0
4	2025-09-30	85	0
-	1970-09-30	85	0
5	2009-09-30	83	0
-	1972-09-30	83	0

The odd thing is the first week of October has been warmer, I know of at least two occasions in my life when I experienced 90+ in October. And even 95 a few years ago.

Warmer over several days but nothing too extreme.  80+ is what we got last year in November too (and as late as November 15 in 1993.)

 

 

[LibertyBell]

6 hours ago, NorthShoreWx said:

2007 wasn't a heatwave, but it was a pretty warm run for early October.  Just missed 6 (arguably 7) consecutive 80° days.  Very warm nights too.  This is from Central Park:

Day	Max	Min	Rain
2007 10 01	69	59	0
2007 10 02	75	58	0
2007 10 03	78	65	0.03
2007 10 04	84	69	0
2007 10 05	83	67	0
2007 10 06	83	66	0
2007 10 07	82	67	0
2007 10 08	87	67	0
2007 10 09	79	60	0.52

Yes indeed this was the other 90+ day I remember from October.

The even more extreme one was October 2, 2019 when it hit 95-96 here with a HI of 100 lol

[LibertyBell]

6 hours ago, NorthShoreWx said:

2007 wasn't a heatwave, but it was a pretty warm run for early October.  Just missed 6 (arguably 7) consecutive 80° days.  Very warm nights too.  This is from Central Park:

Day	Max	Min	Rain
2007 10 01	69	59	0
2007 10 02	75	58	0
2007 10 03	78	65	0.03
2007 10 04	84	69	0
2007 10 05	83	67	0
2007 10 06	83	66	0
2007 10 07	82	67	0
2007 10 08	87	67	0
2007 10 09	79	60	0.52

JFK hit 90 on 10/8/2007 I think Ed?

[LibertyBell]

11 hours ago, SACRUS said:

 

Highs
 

 

EWR: 83
PHL: 83
New Brnswck: 82
ISP: 82
TEB: 81
JFK: 81
TTN: 81
NYC: 81
LGA: 80
ACY: 79
BLM: 77

Yay JFK closes out the month over 80

[bluewave]

2 minutes ago, LibertyBell said:

The odd thing is the first week of October has been warmer, I know of at least two occasions in my life when I experienced 90+ in October. And even 95 a few years ago.

Warmer over several days but nothing too extreme.  80+ is what we got last year in November too (and as late as November 15 in 1993.)

 

 

It just works out that the first week of October has warmer record highs than the last week of September.

Newark Area, NJ
Period of record: 1931-01-01 through 2025-09-30DateHighest maximum temperatures (degrees F)Top Record 2nd Record 3rd Record

 

9/24	92 in 2017	92 in 1959	89 in 1970
9/25	91 in 1970	90 in 2017	90 in 2010+
9/26	90 in 2007	90 in 1958	88 in 1970
9/27	91 in 1998	89 in 1933	88 in 2017
9/28	89 in 2025	87 in 2014	86 in 2019
9/29	89 in 1945	83 in 1959	82 in 2015+
9/30	89 in 1986	85 in 1954	83 in 2025
10/1	85 in 1986	85 in 1950	84 in 2019+
10/2	96 in 2019	86 in 2013	86 in 2002+
10/3	85 in 2023	85 in 1950	84 in 2021+
10/4	89 in 2013	87 in 2007	87 in 1959
10/5	93 in 1941	87 in 1967	86 in 2017
10/6	91 in 1959	90 in 1941	88 in 1997+
10/7	88 in 1944	87 in 1946	85 in 199

[LibertyBell]

13 hours ago, Roger Smith said:

In Sept 1882 as indicated the massive rainfalls 22nd-23rd were in advance of landfalling TS4, and the 2.57" on the 11th plus 0.66" on 12th was due to passage of Hurricane Two (by then only a TS) across the Delmarva Peninsula after a landfall near Mobile (Navarre FL) on the night of 10th-11th. Between those, TS3 of 1882 was a weaker event that moved into TX around the 16th. 

how strong was the September 1882 TS4 when it made landfall on Long Island, Roger?

[LibertyBell]

13 hours ago, SACRUS said:

Thanks

 

September 1882 New York City Weather

Day	High (°F)	Low (°F)	Precip. (inches)	Snow (inches)
September 1	81	69	0.07	0.0
September 2	85	70	0.00	0.0
September 3	80	72	0.00	0.0
September 4	82	72	0.64	0.0
September 5	79	68	0.00	0.0
September 6	76	65	0.00	0.0
September 7	79	63	0.00	0.0
September 8	82	66	0.00	0.0
September 9	73	63	0.16	0.0
September 10	68	62	0.00	0.0
September 11	67	59	2.57	0.0
September 12	70	57	0.66	0.0
September 13	69	53	0.00	0.0
September 14	77	64	0.09	0.0
September 15	73	63	0.00	0.0
September 16	76	58	0.00	0.0
September 17	74	60	0.00	0.0
September 18	80	65	0.00	0.0
September 19	87	69	0.00	0.0
September 20	84	72	0.29	0.0
September 21	72	62	1.21	0.0
September 22	72	62	2.34	0.0
September 23	66	55	8.28	0.0
September 24	69	55	0.02	0.0
September 25	62	55	0.04	0.0
September 26	63	56	0.05	0.0
September 27	62	51	0.00	0.0
September 28	55	48	0.16	0.0
September 29	60	48	0.27	0.0
September 30	68	50	0.00	0.0

8.28 in one day has to be a monthly record, Tony??

[LibertyBell]

1 minute ago, bluewave said:

It just works out that the first week of October has warmer record highs than the last week of September.

Newark Area, NJ
Period of record: 1931-01-01 through 2025-09-30DateHighest maximum temperatures (degrees F)Top Record 2nd Record 3rd Record

 

9/24	92 in 2017	92 in 1959	89 in 1970
9/25	91 in 1970	90 in 2017	90 in 2010+
9/26	90 in 2007	90 in 1958	88 in 1970
9/27	91 in 1998	89 in 1933	88 in 2017
9/28	89 in 2025	87 in 2014	86 in 2019
9/29	89 in 1945	83 in 1959	82 in 2015+
9/30	89 in 1986	85 in 1954	83 in 2025
10/1	85 in 1986	85 in 1950	84 in 2019+
10/2	96 in 2019	86 in 2013	86 in 2002+
10/3	85 in 2023	85 in 1950	84 in 2021+
10/4	89 in 2013	87 in 2007	87 in 1959
10/5	93 in 1941	87 in 1967	86 in 2017
10/6	91 in 1959	90 in 1941	88 in 1997+
10/7	88 in 1944	87 in 1946	85 in 199

wow this is very interesting and sort of like how the first week of April has more snow than the last week of March lol

[LibertyBell]

2 minutes ago, bluewave said:

It just works out that the first week of October has warmer record highs than the last week of September.

Newark Area, NJ
Period of record: 1931-01-01 through 2025-09-30DateHighest maximum temperatures (degrees F)Top Record 2nd Record 3rd Record

 

9/24	92 in 2017	92 in 1959	89 in 1970
9/25	91 in 1970	90 in 2017	90 in 2010+
9/26	90 in 2007	90 in 1958	88 in 1970
9/27	91 in 1998	89 in 1933	88 in 2017
9/28	89 in 2025	87 in 2014	86 in 2019
9/29	89 in 1945	83 in 1959	82 in 2015+
9/30	89 in 1986	85 in 1954	83 in 2025
10/1	85 in 1986	85 in 1950	84 in 2019+
10/2	96 in 2019	86 in 2013	86 in 2002+
10/3	85 in 2023	85 in 1950	84 in 2021+
10/4	89 in 2013	87 in 2007	87 in 1959
10/5	93 in 1941	87 in 1967	86 in 2017
10/6	91 in 1959	90 in 1941	88 in 1997+
10/7	88 in 1944	87 in 1946	85 in 199

Chris when did it hit 90 the other time at JFK in October, was that 10/8/2007? Did Newark hit 90 on that date too?

I think the two 90s I remember in October happened on 10/2/2019 (95) and 10/7/2007 (90).

 

[SACRUS]

1 minute ago, LibertyBell said:

Chris when did it hit 90 the other time at JFK in October, was that 10/8/2007? Did Newark hit 90 on that date too?

I think the two 90s I remember in October happened on 10/2/2019 (95) and 10/7/2007 (90).

 

 

 

10/8/07 : 90

[SACRUS]

2 minutes ago, LibertyBell said:

Chris when did it hit 90 the other time at JFK in October, was that 10/8/2007? Did Newark hit 90 on that date too?

I think the two 90s I remember in October happened on 10/2/2019 (95) and 10/7/2007 (90).

 

JFK did get to 86 in 2016 on Oct 19th.

[LibertyBell]

4 minutes ago, SACRUS said:

 

 

10/8/07 : 90

 

4 minutes ago, SACRUS said:

JFK did get to 86 in 2016 on Oct 19th.

Thanks I remember the one in 2007 but had forgotten the one in 2016.

86 F is 30 C, is this the latest such temperature at JFK Tony?

And was that 80+ temperature at JFK last year in November the latest 80+ reading there?

[SACRUS]

1 minute ago, LibertyBell said:

 

Thanks I remember the one in 2007 but had forgotten the one in 2016.

86 F is 30 C, is this the latest such temperature at JFK Tony?

 

Warmest so late it did hit 80 (latest) last year

 

JFK;
11/1/2024: 82
11/7/2022: 80

[lee59]

57 this morning, back to normal.

[bluewave]

Another very warm start to fall around the area. Numerous stations finishing within top 10 warmest for September. Islip had their 3rd warmest September on record. The last top 3 coldest September there was in 1978. The last top 10 coldest was 2009 at 9th coldest.
 

Time Series Summary for SUSSEX AIRPORT, NJ - Month of Sep
Click column heading to sort ascending, click again to sort descending.

1	2018	66.8	0
2	2015	66.5	0
3	2011	65.9	0
4	2025	65.8	0
5	2021	65.7	0
6	2005	65.5	0
7	2014	65.2	0
8	2017	65.1	0
9	2019	65.0	0
10	2016	64.6	8

 

Time Series Summary for SOMERSET AIRPORT, NJ - Month of Sep
Click column heading to sort ascending, click again to sort descending.

1	2015	69.8	0
2	2018	69.4	0
3	2016	68.7	0
-	2005	68.7	0
4	2025	68.2	0
5	2011	67.9	0
6	2019	67.8	0
7	2017	67.6	0
8	2023	67.4	0
9	2021	67.3	0
10	2010	67.0	0
-	2004	67.0	0

 

Time Series Summary for WESTCHESTER CO AP, NY - Month of Sep
Click column heading to sort ascending, click again to sort descending.

1	1961	71.0	0
2	2015	69.9	0
3	2016	68.8	0
4	2005	68.4	0
-	1959	68.4	1
5	1983	68.2	0
6	1985	68.1	3
7	2018	68.0	0
-	1971	68.0	0
8	2017	67.9	0
9	1970	67.8	0
10	2025	67.7	0
-	2011	67.7	0

 

Time Series Summary for NEWARK LIBERTY INTL AP, NJ - Month of Sep
Click column heading to sort ascending, click again to sort descending.

1	1961	74.5	0
2	1881	73.9	0
3	2005	73.5	0
4	2015	73.4	0
5	2021	72.5	0
6	2016	71.8	0
-	1971	71.8	0
7	2025	71.7	0
-	1921	71.7	6
8	2010	71.6	0
9	1959	71.5	0
10	2018	71.4	0

 

Time Series Summary for ISLIP-LI MACARTHUR AP, NY - Month of Sep
Click column heading to sort ascending, click again to sort descending.

1	2015	70.9	0
2	2005	70.2	0
3	2025	69.8	0
-	2018	69.8	0
4	2021	69.6	0
-	1980	69.6	0
5	2017	69.0	0
-	2011	69.0	0
6	2016	68.9	0
7	2023	68.6	0
-	1998	68.6	0
8	2010	68.3	0
9	2022	68.2	0
10	1983	68.1	0
-	1971	68.1	0

 

Time Series Summary for NEW HAVEN TWEED AP, CT - Month of Sep
Click column heading to sort ascending, click again to sort descending.

1	2000	75.0	26
2	1961	70.2	0
3	2021	70.1	0
4	2018	69.4	0
5	2025	69.2	0
-	2023	69.2	0
6	2015	69.1	0
-	2011	69.1	0
7	2010	68.9	0
8	2022	68.7	0
9	1971	68.5	0
10	1977	68.3	0

 

[steve392]

52 degree's in Mahwah this morning. Crystal clear skies

[bluewave]

First time since 1982 that New Brunswick had a colder monthly minimum temperature in August than September.

Monthly Lowest Min Temperature for New Brunswick Area, NJ (ThreadEx)
Click column heading to sort ascending, click again to sort descending.

2025	48	49	48
2024	51	45	45
2023	55	49	49
2022	55	41	41
2021	55	50	50
2020	56	38	38
2019	55	42	42
2018	55	50	50
2017	53	46	46
2016	52	43	43
2015	53	47	47
2014	50	42	42
2013	51	40	40
2012	54	42	42
2011	52	42	42
2010	52	44	44
2009	56	43	43
2008	53	46	46
2007	55	43	43
2006	51	40	40
2005	55	40	40
2004	52	44	44
2003	53	45	45
2002	55	47	47
2001	54	43	43
2000	49	36	36
1999	54	44	44
1998	50	39	39
1997	53	36	36
1996	55	43	43
1995	52	45	45
1994	50	44	44
1993	56	36	36
1992	50	38	38
1991	53	37	37
1990	56	40	40
1989	51	35	35
1988	51	45	45
1987	45	39	39
1986	42	39	39
1985	53	42	42
1984	50	38	38
1983	51	37	37
1982	40	44	40

[anthonymm]

1 hour ago, LibertyBell said:

wow this is very interesting and sort of like how the first week of April has more snow than the last week of March lol

Is this really true?

[Stormlover74]

14 minutes ago, anthonymm said:

Is this really true?

I can't really think of many storms in the final week of March while early April has produced a few. Very small sample size though. 1982 and 2003 probably skewing the results