Climate averages 1991–2020
Jacksonville weather
in September.
A hot, wet month: the joint 4th warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Jacksonville: daytime highs average 29.0°C and nights cool to about 22.8°C. By daytime temperature it is the joint 4th warmest of the 12 months.
Expect about 121 mm of rain on roughly 16 days, which makes September a wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 22 min on an average September day.
The nearest other city in this atlas is Palm Coast (94 km away). In September its highs average 28.7°C, about as warm as Jacksonville, with 137 mm of rain.
Among the 498 cities listed in the United States, Jacksonville ranks joint 171st of 498 for the warmest September highs and joint 451st of 498 for the driest September (rainfall, lowest first). The mean September high of those 498 cities is 26.9°C; Jacksonville is 2.1°C warmer than that mean.
From September to October, average highs fall by 3.3°C to 25.7°C, and monthly rainfall falls from 121 mm to 70 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Jacksonville climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 17.3°C8.8°C | 8.8°C | 66 | 7.3 | 10.410 h |
| February | 19.2°C10.3°C | 10.3°C | 63 | 6.9 | 11.111 h |
| March | 22.2°C12.6°C | 12.6°C | 76 | 7.5 | 12.012 h |
| April | 25.6°C15.9°C | 15.9°C | 58 | 6.9 | 12.913 h |
| May | 29.0°C19.6°C | 19.6°C | 66 | 8.9 | 13.714 h |
| June | 30.7°C22.9°C | 22.9°C | 131 | 18.9 | 14.114 h |
| July | 31.7°C24.1°C | 24.1°C | 125 | 20.4 | 13.914 h |
| August | 30.9°C24.1°C | 24.1°C | 141 | 21.6 | 13.213 h |
| September, selected | 29.0°C22.8°C | 22.8°C | 121 | 15.8 | 12.412 h |
| October | 25.7°C18.7°C | 18.7°C | 70 | 9.2 | 11.511 h |
| November | 21.6°C13.7°C | 13.7°C | 42 | 6.0 | 10.711 h |
| December | 18.6°C10.6°C | 10.6°C | 58 | 6.5 | 10.210 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Palm Coast in SeptemberUnited States · 94 kmHigh 28.7°C · Low 24.0°C · 137 mm rain
- Gainesville in SeptemberUnited States · 99 kmHigh 29.9°C · Low 22.2°C · 107 mm rain
- Daytona Beach in SeptemberUnited States · 139 kmHigh 29.3°C · Low 23.7°C · 140 mm rain
- Deltona in SeptemberUnited States · 164 kmHigh 29.8°C · Low 23.1°C · 146 mm rain
- Alafaya in SeptemberUnited States · 201 kmHigh 29.6°C · Low 23.2°C · 143 mm rain
- Orlando in SeptemberUnited States · 201 kmHigh 29.8°C · Low 23.0°C · 142 mm rain
- Savannah in SeptemberUnited States · 202 kmHigh 28.4°C · Low 21.8°C · 122 mm rain
- Spring Hill in SeptemberUnited States · 223 kmHigh 30.1°C · Low 23.0°C · 144 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Jacksonville) is explained once on the Jacksonville year overview and on the Sources, method and limits page.