The hottest month in Jacksonville is July. Temperatures most days in the month are 90 degrees or higher. The end of July begins the start of summer and First Coast locals always sweat out hot afternoons waiting for cooling thunderstorms. In fact, over a 30 year average of July months, 23 days are above 89 degrees.
Get ready for a return to ninety's all week long into next week. June is often a scorcher. In 2008, June had 21 days at 90 or above. That was also the hottest month out of the '08 summer. The average for 90 degree days in June is 16. The onset to this upcoming heat wave is due to a lack of forecasted rain and a ridge of high pressure in the Gulf.
The 500 mb ridge in the Gulf results in sinking air over Jacksonville which suppresses thunderstorms. The blue vectors show NW winds around the right side of the Gulf ridge.
Looks like the pool or river will be the best places to cool off.
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