For many locales across the United States, the last week of July is the hottest time of the year. And given the prolonged heat over much of the country this summer, just the idea that there is cooler weather ahead may be reason to rejoice.
But a few locations, especially along the West Coast, wait until August and even September to peak. And San Francisco is certainly the latest of any major United States city by not reaching its normal highest maximum temperature of 70.4 degrees until September 24th. Yet, just 40 miles away, San Jose has one of the earlier hottest days on average, peaking out at 83.8 degrees on July 10th.
US Daily Normals can be found at: https://ggweather.com/normals/daily.htm
Jan Null, CCM
Certified Consulting Meteorologist
Golden Gate Weather Services