St. Augustine weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Good
Best time to visit: May – July, October
What is the weather like in St. Augustine in September?
In September, St. Augustine is hot: daytime highs average 28 °C, and even at night it stays warm at around 25 °C. The sea averages 28.0 °C – lovely and warm for swimming. Expect around 6 hours of sunshine a day. It rains often – on about 18 days, adding up to 156 mm. The air is often humid and muggy. All in all, September is a good month for a holiday in St. Augustine.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 74 | 71 | 82 |
| Day | 30° | 28° | 25° |
| Night | 26° | 25° | 22° |
| Sea | 28° | 28° | 26° |
| Sun | 7 h | 6 h | 6 h |
| Rain days | 21 | 18 | 10 |
More details for September
- Daylight
- 12 h 23 min07:09 – 19:32
- UV index
- 9 · very highclear sky, noon (estimate)All months
- Muggy days
- 29 daysdew point 18 °C or moreAll months
- Wind
- 19 km/haverage daily peakAll months
- Cloud cover
- 60 %on averageAll months
- Hot days
- 3 days30 °C or moreAll months
- Time zone
- UTC−4America/New_York
How the score comes together
- Temperatureweight 35 %100 %
- Seaweight 25 %100 %
- Sunshineweight 20 %52 %
- Few rainy daysweight 20 %1 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Sun, sea & sand”.
What to pack in September
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Insect repellent
- Rain jacket or umbrella
St. Augustine in September: quick answers
Is St. Augustine hot in September?
Yes. In September, St. Augustine is hot: daytime highs average 28 °C and nights stay around 25 °C. On about 3 days the thermometer climbs to 30 °C or more.
Can you swim in St. Augustine in September?
Yes. In September the sea averages 28.0 °C – lovely and warm for swimming.
Does it rain much in St. Augustine in September?
It rains often – on about 18 days, adding up to 156 mm.
St. Augustine month by month
The whole year in St. AugustineAll destinations: USAFlorida weather in SeptemberWhere to go in SeptemberSea temperature 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