SeasonMapSt. Augustine weather in September
United States
September in St. Augustine: sweltering, rainy, with clean air — a gamble, with sticky heat.
#10 of 12 months in St. Augustine · #1063 of 1383 destinations to visit in September · comfort 63/100 (tier C)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on St. Augustine in September
Other months in St. Augustine
St. Augustine's forum calls mid-March usually beautiful — mid-70s°F highs, low-60s°F overnight, mostly sunny. Regulars are honest the water itself is still too cold for swimming even when the beach is warm enough for shorts, and that a late-season cool snap can still turn up, so a layer is worth packing.
Add your own note from St. Augustine's card on the map.
St. Augustine climate normals — September
| Daytime high | 29°C / 85°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 23°C / 74°F | |
| Feels like (high) | 34°C / 93°F | |
| Sea temperature | 29°C / 84°F | ♨️ bath-warm |
| Rainfall | 143 mm / 5.6 in | 🌧 rainy |
| Rainy days | 13 days | |
| Humidity | 81% | 💦 very humid |
| Dew point | 23°C / 73°F | |
| Sunshine | 9.7 h/day | |
| Daylight | 12.3 h | |
| Wind | 19 km/h / 12 mph | |
| Air quality (US AQI) | 44 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in St. Augustine in September
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
BusySummer break in United States(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for St. Augustine's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Toughest weatherSt. Augustine's weather peaks February–April, best around March.
September coincides with Hurricane season.
Best weatherFair weatherToughest weather
What's on in St. Augustine in September
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Nature
Sea turtle nesting
1 May – 31 OctLoggerheads nest along the county's beaches from May, with hatchlings running into October. Beach driving is restricted and the dune-line lighting rules are enforced through the whole season. Source ↗
- Hazard
Hurricane season
1 Jun – 30 NovThe Atlantic season runs June to November. The old town sits barely above the Matanzas and has flooded to the doorsteps twice in the last decade, from storms that never made landfall here. Source ↗
- Hazard
Summer heat
15 Jun – 10 Sep · usuallyExtreme heatHot and heavy with an afternoon storm most days, and the narrow old streets hold it. The fort and the walking tours are morning things in these months, whatever the schedule says. Source ↗
Nearby, and something's on
Within 300 km of St. Augustine — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is St. Augustine?
St. Augustine in September — FAQ
- Is September a good time to visit St. Augustine?
- September in St. Augustine: sweltering, rainy, with clean air — a gamble, with sticky heat. It ranks #10 of 12 months for St. Augustine on SeasonMap's comfort score (63/100).
- What is the weather like in St. Augustine in September?
- In September, St. Augustine averages a daily high of 29.3°C and a low of 23.3°C, with about 143 mm of rain over roughly 12.5 rainy days.
- What is the air quality in St. Augustine in September?
- St. Augustine has a mean US Air Quality Index of about 44 in September.
Other months in St. Augustine
Compare St. Augustine in September
Warmer or cooler than St. Augustine in September
Similar destinations in North America — September
Within 300 km: Jacksonville's Loggerhead nesting on 1 May – 31 Oct, and Clearwater's Sea turtle nesting on 1 May – 31 Oct.