Historical weather data, all-time temperature records, and monthly climate averages for Keystone, FL. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Keystone sits right in that sweet spot of spring — 132 years of data put the average high at 81° with just a 16% chance of rain. This date has seen a wild range, from a frigid 43° low back in 1943 all the way to a scorching 92° high just this year in 2025.
Keystone's weather has real teeth at both ends of the thermometer — the all-time high hit 102° in July 1997, while January 1981 brought a bone-chilling 19°. The wettest single day on record dumped 11.72 inches on June 24, 2012, a reminder that Florida's summer storms don't mess around.
Keystone runs hot from June through September, with average highs peaking at 91° in late July and early August — and that's also when the heaviest rain falls, averaging 2.46 inches in a single week at the end of July. If you're after cooler, drier weather, January is your best bet, with highs hovering around a comfortable 70°.