How hot and humid has the past day been in Sioux City?

Here's a look at the new hourly records for heat index and dew point.

We've now tied or broken 12 hours of hourly dew point records in the past day, with some of the warmest overnight heat index values on record. pic.twitter.com/P5yb9GBVr5

— NWS Sioux Falls (@NWSSiouxFalls) August 22, 2023