Amelia Island water temperature in April
Key facts
The Atlantic off Amelia Island averages 71.2°F in April — comfortable. Swimmable for most people without any neoprene. That is right at the island’s annual average, and 6.5°F up on March.
- Average daily high to low
- Ocean temperature
April in the water
April produces the widest gap between how the day looks and how the water feels. Afternoons are genuinely warm; the sea is not. Expect a few minutes in, not an afternoon. Pools are the honest answer in April unless you are used to cold water.
At 71.2°F the sea is right at the island’s annual average. The air reaches 77.4°F in April, a gap of 6.2°F, noticeable for the first thirty seconds and then gone.
What to wear
A spring suit or a top is plenty. Swimmers manage without, but not for long.
Where this number comes from
71.2°F is the mean of every hourly reading for April across 2023, 2024 and 2025 at NOAA CO-OPS station 8720218, Mayport (Bar Pilots Dock), FL — about 30 km south of the island. The Fernandina Beach station on the island has no water-temperature sensor, so no on-island long record exists to average. We would rather say that plainly than publish an on-island figure we cannot support.
A monthly mean is not a forecast. The real ocean in any given April week moves several degrees around this figure, and a hard south-westerly can pull colder water up onto the shelf in a day. For the reading right now, the offshore waverider buoy 41112 (Offshore Fernandina Beach, FL, 17 km ENE) reports water temperature alongside wave height — that is what feeds our surf report and beach conditions.
April against the months either side
| March | April | May | |
|---|---|---|---|
| Sea temperature | 64.7°F | 71.2°F | 77.7°F |
| Our reading | Brisk | Comfortable | Warm |
| Air high | 72.2°F | 77.4°F | 83.9°F |
The annual mean is 72.6°F, and the sea lags the air by about two months in both directions — see water temperature by month for why that lag matters more than the raw number.
Next and previous months
Planning a April beach day
Part of Amelia Island water temperature by month.
Frequently asked questions
- What is the water temperature at Amelia Island in April?
- The ocean averages 71.2°F (21.8°C) in April, from three years of hourly NOAA readings at the nearest sensor with a long record — station 8720218, 30 km south of the island. A given week moves several degrees around that.
- Can you swim at Amelia Island in April?
- Comfortable at 71.2°F. Swimmable for most people without any neoprene.
- Do you need a wetsuit at Amelia Island in April?
- A spring suit or a top is plenty. Swimmers manage without, but not for long.