Jacksonville weather in September
Temperature, rain and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Fair
Best time to visit: October – May
What is the weather like in Jacksonville in September?
In September, Jacksonville is hot: daytime highs average 29 °C, and even at night it stays warm at around 23 °C. Expect around 6 hours of sunshine a day. It rains often – on about 16 days, adding up to 144 mm. On about 9 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, September is a so-so month for a holiday in Jacksonville.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 39 | 51 | 79 |
| Day | 31° | 29° | 26° |
| Night | 24° | 23° | 19° |
| Sun | 7 h | 6 h | 6 h |
| Rain days | 21 | 16 | 9 |
More details for September
- Daylight
- 12 h 23 min07:10 – 19:34
- UV index
- 9 · very highclear sky, noon (estimate)All months
- Muggy days
- 28 daysdew point 18 °C or moreAll months
- Wind
- 18 km/haverage daily peakAll months
- Cloud cover
- 59 %on averageAll months
- Hot days
- 9 days30 °C or moreAll months
- Time zone
- UTC−4America/New_York
How the score comes together
- Temperatureweight 50 %75 %
- Sunshineweight 20 %47 %
- Few rainy daysweight 30 %14 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Water bottle – drink plenty
- Insect repellent
- Rain jacket or umbrella
Jacksonville in September: quick answers
Is Jacksonville hot in September?
Yes. In September, Jacksonville is hot: daytime highs average 29 °C and nights stay around 23 °C. On about 9 days the thermometer climbs to 30 °C or more.
Does it rain much in Jacksonville in September?
It rains often – on about 16 days, adding up to 144 mm.
Jacksonville month by month
The whole year in JacksonvilleAll destinations: USAFlorida weather in SeptemberWhere to go in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences