Jacksonville weather in September
September in Jacksonville: hot, rainy, with clean air — a good time to visit.
#9 of 12 months in Jacksonville · #677 of 897 destinations to visit in September · comfort 69/100 (tier C)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Jacksonville in September
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Jacksonville climate normals — September
| Daytime high | 29°C / 85°F | 🥵 hot |
|---|---|---|
| Nighttime low | 23°C / 74°F | |
| Rainfall | 106 mm / 4.2 in | 🌧 rainy |
| Rainy days | 16 days | |
| Humidity | 78% | 💦 very humid |
| Dew point | 21°C / 70°F | |
| Sunshine | 9.7 h/day | |
| Daylight | 12.3 h | |
| Wind | 15 km/h / 9 mph | |
| Air quality (US AQI) | 47 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Jacksonville in September — FAQ
- Is September a good time to visit Jacksonville?
- September in Jacksonville: hot, rainy, with clean air — a good time to visit. It ranks #9 of 12 months for Jacksonville on SeasonMap's comfort score (69/100).
- What is the weather like in Jacksonville in September?
- In September, Jacksonville averages a daily high of 29.4°C and a low of 23.1°C, with about 105.8 mm of rain over roughly 16 rainy days.
- What is the air quality in Jacksonville in September?
- Jacksonville has a mean US Air Quality Index of about 47 in September.