Is today a good day for sea swimming in Jacksonville?
Today is not the day.
Not safe for sea swimming today. Force 3, but gusting Force 6 — it is the spread that catches you out, not the average. Out of season for it, whatever the weather does.
Not today14/100
7-day outlook for sea swimming in Jacksonville
Best day looks like Wednesday at 35/100.
Why this score?
Data from Open-Meteo, and Open-Meteo Marine for waves and sea temperature. Last updated 21:33 UTC.
Sea swimming in Jacksonville, month by month
The sea is warmest in July at 29°C and coldest in February at 16°C. Offshore waves are biggest in November (the day's highest averages 1.1 m) and smallest in July (0.5 m). Daytime highs peak at 32°C in July and fall to 19°C in January. August is the wettest month, with about 23 days of 1 mm or more; December is the driest, with about 6.
Our seasonal guide puts sea swimming in season from May to October.
| Month | Sea temperature (°C) | Offshore wave height (m) | Daytime high (°C) | Rainy days (days) |
|---|---|---|---|---|
| January | 16 | 0.8 | 19 | 7 |
| February | 16 | 0.9 | 21 | 9 |
| March | 19 | 0.9 | 24 | 9 |
| April | 21 | 0.8 | 26 | 8 |
| May (in season) | 25 | 0.7 | 29 | 10 |
| June (in season) | 27 | 0.7 | 31 | 19 |
| July (in season) | 29 | 0.5 | 32 | 23 |
| August (in season) | 29 | 0.7 | 31 | 23 |
| September (in season) | 28 | 1.0 | 29 | 19 |
| October (in season) | 25 | 1.0 | 26 | 8 |
| November | 22 | 1.1 | 23 | 9 |
| December | 17 | 1.1 | 20 | 6 |
In season, by our seasonal guide
Averages of daily weather 2020 to 2024 and of waves and sea temperature 2022 to 2024, from ERA5 reanalysis data (about 25 km resolution; waves are measured offshore, not in the surf at the beach). Not a forecast.
About sea swimming in Jacksonville
The biggest US city by land area — Atlantic beach on one side, the St. Johns River through the middle.
Go Daisy scores 47 activities for Jacksonville, including running, cycling, urban exploring, photography, outdoor yoga. The score for sea swimming updates hourly from the same weather data professional services use.
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Score for sea swimming in Jacksonville updated hourly. Free, ad-free. Built by independent makers in the UK and Asturias, Spain.
Weather data from Open-Meteo.