GFS looks like typical fall weather for late September into early October. Compared to average I’d say we go through this period near normal to slightly below.
There are some truisms that you can usually hang your hat on with medium range forecasting. One, cold fronts always arrive later than forecast. Two, cold air always has a tough time getting past the mountains. Three, air masses are typically modeled colder than they turn out to be. It’s a pronounced modeling bias.
None of this is new.
Your regular programming will now continue.