Amelia Island in September
Key facts
September on Amelia Island averages 86°F by day and 73.2°F at night, with the ocean at 82.4°F — bath-warm. Expect 7.19″ of rain across about 9.1 wet days: near-daily afternoon thunderstorms rather than all-day rain.
- Average daily high to low
- Ocean temperature
- Rainfall, inches
What September actually feels like
September is the best-value weather month on the island and the one with the largest asterisk. Days are still in the mid-eighties, the water is still bath-warm, the crowds have gone home — and the statistical peak of the Atlantic hurricane season falls in the first half of the month. It is also the wettest month of the year.
Warm ocean with an empty beach is a September-only combination here. The fishing also turns on as the bait moves.
The ocean in September
At 82.4°F the water is 9.8°F above the island’s annual average of 72.6°F. No cooling effect at all — shade and water matter more than the sea. The air reaches 86°F, a gap of 3.6°F over the sea — small enough that the water gives you no relief from the heat at all. Ocean figures are means of hourly readings at the nearest NOAA sensor with a long record, 30 km south at Mayport — see ocean temperature by month.
Rain and storms
September averages 7.19″ across about 9.1 wet days, against 49.93″ for the year. That is near-daily afternoon thunderstorms rather than all-day rain. September falls inside the Atlantic hurricane season, which runs 1 June to 30 November with its statistical peak in early September. That is a season, not a forecast — see our hurricane season guide for what it actually means for a booking.
What to pack
- nothing warm at all — the evening stays in the seventies
- a light rain shell rather than an umbrella; the storms arrive with wind
- sun cover that works at midday: hat, shirt, and more water than you think
- swimwear you will actually use — the ocean is warm this month
- insect repellent for dusk near the marsh
If the weather does not co-operate
Buy the refundable rate, watch the National Hurricane Center rather than a forecast app, and read our hurricane season guide before booking. The tide matters more than the forecast for a beach day — a high tide on a narrow access leaves very little sand — so check today's tides before you commit to a stretch of beach.
Crowds and cost
Low for the weather you get. Rates drop noticeably after Labor Day. We do not publish rates: they move constantly and we will not quote a figure we have not verified.
September against the months either side
| August | September | October | |
|---|---|---|---|
| Average high | 89.5°F | 86°F | 80.1°F |
| Average low | 74.9°F | 73.2°F | 65.3°F |
| Ocean | 84.6°F | 82.4°F | 76°F |
| Rain | 6.39″ | 7.19″ | 4.97″ |
Next and previous months
Planning a September trip
Part of Amelia Island weather month by month.
Frequently asked questions
- How warm is Amelia Island in September?
- September averages a high of 86°F and a low of 73.2°F, for a daily mean of 79.6°F. Those are NOAA 1991–2020 normals for the station on the island itself, not the airport inland.
- Can you swim in the ocean at Amelia Island in September?
- The ocean averages 82.4°F in September — bath-warm. No cooling effect at all — shade and water matter more than the sea.
- Does it rain much in September?
- September averages 7.19″ across about 9.1 days receiving 0.10″ or more, out of 49.93″ for the year. Expect near-daily afternoon thunderstorms rather than all-day rain.
- Is September a risky month for hurricanes on Amelia Island?
- September falls inside the Atlantic hurricane season, 1 June to 30 November, with the statistical peak in early September. Risk in any single week is low, but it is not zero — take the refundable rate and follow the National Hurricane Center rather than a consumer forecast app.