Jacksonville Weather in September
September in Jacksonville typically sees daytime highs of 31°C (88°F) and nighttime lows of 21°C (70°F). Rainfall is also possible this month, so it's worth packing an umbrella.
Rainfall in Jacksonville in September
Typically around 15 days of rainfall are expected, averaging 156 mm (6.1 in) for the month. When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.
Temperature in Jacksonville in September
September in Jacksonville sees highs of 31°C (88°F) and lows of 21°C (70°F) overnight. For most visitors, the main thing to prepare for is the heat during the day. Nights remain mild at 21°C (70°F), making evenings a pleasant time to be outdoors.
Sunshine in Jacksonville in September
The month enjoys around 231 hours of sunshine, creating mostly sunny days with good weather conditions.
Wind Speed in Jacksonville in September
Wind speeds average 3 m/s (6 knots) during September. At this speed, light breezes keep leaves and small twigs in gentle motion while the wind also provides natural cooling. Since this is an average, some days are more tranquil while others have more persistent light winds that are more noticeable.
Average water temperature in September
At 28°C (82°F), the water is warm and comfortable for swimming. Most people find this temperature ideal for spending longer periods in the water.If you prefer enjoying temperate temperatures and rain-free days, February, March, April, October, November and December typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Jacksonville's climate page.
Jacksonville Temperature in September
Min Temperature
21°C (70°F)
Max Temperature
31°C (88°F)
Water Temperature
28°C (82°F)
Chance of Rain
49%
Precipitation
156 mm (6.1 in)
Rainy days
15 days
Humidity
81%
Windspeed
3 m/s (6 knots)
Sunshine
231 hours
Percentage Sunshine
62%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Jacksonville typically stay consistent throughout September, with daily highs averaging around 31°C (88°F). Nights are warm, with lows typically ranging from 20°C (68°F) to 23°C (73°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Jacksonville in September
Browse day-by-day weather records for Jacksonville spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Jacksonville historical weather extremes in September
Our historical data for Jacksonville spans 1976 to 2025, revealing these weather extremes.
- The warmest day in September was on September 8, 1990, with a maximum of 37°C (99°F).
- The coldest September day was on September 29, 2022, with a maximum of 21°C (70°F).
- The lowest overnight temperature recorded in September was 9°C (48°F) (September 19, 1981).
Best Places in the United States of America in September
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in September →
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What to Wear in Jacksonville in September
Warm but pleasant conditions in Jacksonville in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. It's going to pour! Pack a good poncho and prepare for very wet conditions. With water temperatures around 28°C (82°F), swimming conditions are excellent. Pack your swimsuit, goggles, and maybe some water shoes. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.What To Do in Jacksonville in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Jacksonville's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Jacksonville climate overview or explore weather in the United States of America.
