Monthly climate guide
Jacksonville weather in September
Expect hot weather in Jacksonville in September: afternoons reach about 31°C (87°F), while nights drop to around 22°C (71°F). Around 148 mm of rain falls over the month (wet), and skies are often cloudy. Daytime highs are 2°C cooler than August and 4°C warmer than October.
What stands out in September
- Just 400 km apart, but Jacksonville runs about 2°C warmer than Panama City Beach this month.
- In Jacksonville, September is early autumn.
- Humidity near 82% makes 31°C feel stickier than it sounds.
Avg high
31°C
87°F
Avg low
22°C
71°F
Rainfall
148 mm
wet
Humidity
82%
relative
Sky
60%
cloud · often cloudy
Jacksonville weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 18°C / 64°F | 6°C / 43°F | 79 mm | 80% | 66% |
| February | 21°C / 70°F | 9°C / 48°F | 78 mm | 81% | 62% |
| March | 24°C / 75°F | 11°C / 52°F | 67 mm | 75% | 52% |
| April | 28°C / 82°F | 15°C / 59°F | 90 mm | 73% | 48% |
| May | 31°C / 88°F | 19°C / 66°F | 106 mm | 69% | 45% |
| June | 32°C / 90°F | 22°C / 72°F | 194 mm | 76% | 58% |
| July | 33°C / 92°F | 23°C / 74°F | 155 mm | 78% | 55% |
| August | 33°C / 91°F | 24°C / 74°F | 173 mm | 81% | 59% |
| September | 31°C / 87°F | 22°C / 71°F | 148 mm | 82% | 60% |
| October | 27°C / 81°F | 17°C / 63°F | 83 mm | 80% | 51% |
| November | 23°C / 73°F | 12°C / 53°F | 65 mm | 80% | 60% |
| December | 21°C / 69°F | 9°C / 49°F | 81 mm | 84% | 67% |
What to pack for September
- Light, breathable clothing (cotton or linen)
- A sun hat and high-SPF sunscreen
- A refillable water bottle
- A compact umbrella or packable rain jacket
- Water-resistant shoes
- Quick-dry fabrics — it feels stickier than the temperature suggests
Is September a good time to visit Jacksonville?
Compare the months in the chart above to find your ideal window.
Best time to visit Jacksonville →Other United States cities in September
Cite or embed this data
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Jacksonville weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/usa/jacksonville/september
<a href="https://weathercompare.eu/weather/usa/jacksonville/september">Jacksonville weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/usa/jacksonville" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Jacksonville weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/usa/jacksonville/september">Jacksonville weather in September</a> – WeatherCompare</p>
Jacksonville in September: quick answers
Is September a good time to visit Jacksonville?
September is one of the wetter months in Jacksonville, with about 148 mm of rain. You can still go: pack a rain jacket and keep plans flexible.
How warm is Jacksonville in September?
Average highs are about 31°C (87°F) and average lows about 22°C (71°F), based on 10 years of daily data.
Does it rain a lot in Jacksonville in September?
Jacksonville typically gets around 148 mm of rain in September — wet.
Figures are long-term averages for the area around Jacksonville (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.