Surfside Beach Nantucket Water Temperature & Swim Forecast
Popular Massachusetts beach near Nantucket.
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Location
Surfside Beach Nantucket 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 Surfside Beach Nantucket's current water temperature. Individual tolerance, wind chill, and session length all matter — when in doubt, size up.
Surfside Beach Nantucket 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
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- 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 Surfside Beach Nantucket 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 Surfside Beach Nantucket next week?
Based on long-term August averages and the latest marine model, expect the sea around Surfside Beach Nantucket to sit close to 20.0°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 Surfside Beach Nantucket?
July – August – September are typically the warmest months to swim at Surfside Beach Nantucket, with sea temperatures at their seasonal peak.
Can I swim at Surfside Beach Nantucket today?
Live data is loading. In summer, this beach typically offers comfortable swimming conditions.
- • Located in Massachusetts, 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 Surfside Beach Nantucket
The sea in Surfside Beach Nantucket peaks in August, when the water averages around 20°C.
The main swimming season runs from August, when surface temperatures stay comfortable for extended sessions.
On average, 1 month a year sit above 20°C — the threshold most swimmers describe as pleasant without a wetsuit.
Shoulder months like July and September are noticeably cooler but often quieter, with fewer crowds and steadier weather.
Outside peak season the water drops toward 8°C, so a 3/2mm shorty or full wetsuit makes long swims much more comfortable.
The coldest month is typically February at around 3°C, when cold-water swimmers dominate the coast.
Surfside Beach Nantucket sea temperature history
Long-term climatology for Surfside Beach Nantucket shows an annual mean sea temperature of 11°C, ranging from 3°C in winter to 20°C at the summer peak.
The seasonal swing is roughly 17°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 Surfside Beach Nantucket, 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.
Surfside Beach Nantucket sea temperature: frequently asked questions
What is the warmest month to swim in Surfside Beach Nantucket?
August is the warmest month in Surfside Beach Nantucket, when the sea averages about 20°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in Surfside Beach Nantucket?
The coldest month in Surfside Beach Nantucket is typically February, when the water averages around 3°C. Cold-water swimmers and surfers dominate this period.
When can you swim in Surfside Beach Nantucket without a wetsuit?
The main swimming season in Surfside Beach Nantucket runs from August — about 1 month 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 Surfside Beach Nantucket?
Outside peak summer the water in Surfside Beach Nantucket drops toward 8°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 Surfside Beach Nantucket?
The long-term annual mean sea temperature in Surfside Beach Nantucket is about 11°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in Surfside Beach Nantucket?
The live reading at the top of this page shows the current sea temperature in Surfside Beach Nantucket, 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: Aug
| Month | Sea | Comfort |
|---|---|---|
| Jan | 4°C | Cold |
| Feb | 3°C | Cold |
| Mar | 4°C | Cold |
| Apr | 6°C | Cold |
| May | 10°C | Cold |
| Jun | 15°C | Bracing |
| Jul | 19°C | Pleasant |
| Aug ⭐ | 20°C | Pleasant |
| Sep | 18°C | Pleasant |
| Oct | 14°C | Bracing |
| Nov | 10°C | Cold |
| Dec | 6°C | Cold |
Nearby beaches
The closest coastline, with live water temperatures.