Assateague Island Water Temperature & Swim Forecast
Wild-pony national-seashore beach.
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Location
Assateague Island on the map, with nearby beaches and live sea temperatures.
7-day forecast
Water, air, waves, wind and UV outlook for the week ahead.
Check live temperature
Live water temperature is loading — refresh in a moment for a precise recommendation.
Recommendation tuned for Assateague Island's current water temperature. Individual tolerance, wind chill, and session length all matter — when in doubt, size up.
Assateague Island swimming conditions summary
- Water temperature
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- Water feels
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- Swimmable today
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- Swim conditions score
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- Wetsuit needed
- Check live temperature
- Air temperature
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- Waves
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- Wind
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- UV index
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- Warmest months to swim
- July, August, September
Live water temperature is loading — refresh in a moment for a precise recommendation. Live marine data updated hourly from Open-Meteo Marine.
Frequently asked questions
Can I swim at Assateague Island right now?
Live data is loading. Use the 7-day forecast above to plan your swim — conditions above 22°C are comfortable for most swimmers.
What will the sea temperature be at Assateague Island next week?
Based on long-term August averages and the latest marine model, expect the sea around Assateague Island to sit close to 28.0°C over the next 7 days. Check the live 7-day chart above for the exact daily outlook.
When is the best month to swim at Assateague Island?
July – August – September are typically the warmest months to swim at Assateague Island, with sea temperatures at their seasonal peak.
Can I swim at Assateague Island today?
Live data is loading. In summer, this beach typically offers comfortable swimming conditions.
- • Located in Maryland, United States (Atlantic Ocean).
- • Family friendly with calm, accessible water.
- • Live data refreshed hourly from Open-Meteo Marine.
Monthly sea temperature averages
Tap any month to see what to expect — based on regional climatology.
Best time to swim in Assateague Island
The sea in Assateague Island peaks in July, when the water averages around 28°C.
The main swimming season runs from April – November, when surface temperatures stay comfortable for extended sessions.
On average, 8 months a year sit above 20°C — the threshold most swimmers describe as pleasant without a wetsuit.
Shoulder months like March and December are noticeably cooler but often quieter, with fewer crowds and steadier weather.
The coldest month is typically January at around 18°C, when cold-water swimmers dominate the coast.
Assateague Island sea temperature history
Long-term climatology for Assateague Island shows an annual mean sea temperature of 23°C, ranging from 18°C in winter to 28°C at the summer peak.
The seasonal swing is roughly 10°C between the coldest and warmest month — a useful yardstick when comparing years or checking whether the current sea is running above or below average.
Recent decades have trended slightly warmer at Assateague Island, in line with regional sea-surface temperature records for the wider basin.
Monthly averages below are drawn from multi-decadal climatology and are updated as new observations arrive.
Assateague Island sea temperature: frequently asked questions
What is the warmest month to swim in Assateague Island?
July is the warmest month in Assateague Island, when the sea averages about 28°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in Assateague Island?
The coldest month in Assateague Island is typically January, when the water averages around 18°C. Cold-water swimmers and surfers dominate this period.
When can you swim in Assateague Island without a wetsuit?
The main swimming season in Assateague Island runs from April – November — about 8 months a year when the sea sits above 20°C, the level most swimmers describe as pleasant without a wetsuit.
Do I need a wetsuit in Assateague Island?
Outside peak summer the water in Assateague Island drops toward 19°C, so a 3/2mm shorty or full wetsuit makes long swims much more comfortable. In peak months most swimmers go without.
What is the average sea temperature in Assateague Island?
The long-term annual mean sea temperature in Assateague Island is about 23°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in Assateague Island?
The live reading at the top of this page shows the current sea temperature in Assateague Island, updated hourly from marine buoy and satellite data. The 7-day forecast covers water, air, waves, wind and UV for the week ahead.
Year-round sea temperature
Best swim months: Apr – May – Jun – Jul – Aug – Sep – Oct – Nov
| Month | Sea | Comfort |
|---|---|---|
| Jan | 18°C | Pleasant |
| Feb | 18°C | Pleasant |
| Mar | 19°C | Pleasant |
| Apr | 21°C | Pleasant |
| May | 23°C | Warm |
| Jun | 26°C | Hot |
| Jul ⭐ | 28°C | Hot |
| Aug | 28°C | Hot |
| Sep | 27°C | Hot |
| Oct | 25°C | Warm |
| Nov | 22°C | Warm |
| Dec | 19°C | Pleasant |
Nearby beaches
The closest coastline, with live water temperatures.