JACKSONVILLE, Fla. – What started out as one of the coolest Septembers on record at Jacksonville International Airport (JAX), ended as one of the driest. Plus, 90-degree days continue climbing toward a record year.
Summer came to a crisp end
Remember when the beginning of September felt, dare I say, cool? The numbers speak for themselves as it was the 5th coolest start to the month of September, through Sept. 17, with an average temp of 76.8 degrees (-3.1°F below normal) in JAX (records for Jacksonville date back to 1871). The coolest low in September was 60 degrees on the 15th.
Fall started out hot!
The ninth month of 2025 helped inch JAX closer to the all-time annual record of 114 days at or above 90-degree highs. Currently, JAX is at 113 days, just shy of tying the record with only 92 days to go!
According to the National Weather Service Jacksonville office, the annual average is 80 days. October usually averages two days that reach 90 degrees, so the all-time record is not out of reach, but temperatures are expected to remain below 90 degrees over the first week of October. The warmest temperature of the month was 93 degrees on both Sept. 25 and 26.
Where’s the rain?
JAX finished September as the 18th driest September on record with only 2.74 inches of rainfall (-4.82 inches below normal) and the driest since 2019.
The clouds have been quiet, too
In addition to the cooler and drier than normal conditions in JAX this past September, there were only two days with thunderstorm (TS) activity reported, which is tied for the third lowest total on record (since 1871), and the lowest total since September 1984. The average number of TS days in September is seven.
Not all areas are created equally
While JAX is the official reporting and recording spot for our vast region, some folks saw above-average rainfall, along with windy conditions and tidal flooding in September.
The nor’easter effects of gusty winds at the coast and rainy conditions are looking to continue well into the first week of October.
Thankfully, the tropics have remained mostly quiet with less than two months to go in the hurricane season.