Chatham Lighthouse Beach Water Temperature
Sea-surface temperature at Chatham Lighthouse Beach, Massachusetts · times in EDT
Updated 7:03 AM EDT
How it compares today
Water temperature through the year
Monthly normals computed from 2023–2025 daily sea-surface temperature history.
Nearby water right now
7-day outlook
| Day | Air high / low | Max UV | Rain |
|---|---|---|---|
| Fri, Aug 28 | 78° / 70° | 7 | 6% |
| Sat, Aug 29 | 73° / 66° | 6 | 1% |
| Sun, Aug 30 | 82° / 62° | 7 | 16% |
| Mon, Aug 31 | 76° / 67° | 7 | 22% |
| Tue, Sep 1 | 69° / 60° | 1 | 36% |
| Wed, Sep 2 | 74° / 62° | 3 | 40% |
| Thu, Sep 3 | 80° / 70° | 7 | 33% |
Sea-surface temperature and wave data from the Open-Meteo marine model; weather from Open-Meteo.
Is Chatham Lighthouse Beach warm enough to swim?
At 76°F, the water at Chatham Lighthouse Beach is comfortable. Most swimmers are comfortable without a wetsuit above 72°F; below 62°F, cold-water shock becomes a real risk for unprotected swimmers.
That is 1° above the August average of 75°F here.
The water averages above 70°F in July and August — 2 months of the year — peaking around 76°F in July and dropping to about 39°F in February.
Frequently asked questions
How warm is the water at Chatham Lighthouse Beach right now?
The sea-surface temperature is about 76°F. That is 1° above the August average of 75°F here.
When is the water warm enough to swim at Chatham Lighthouse Beach?
The water averages above 70°F in July and August — 2 months of the year — peaking around 76°F in July and dropping to about 39°F in February.
What is the warmest the water gets at Chatham Lighthouse Beach?
Around 76°F in July, based on 2023–2025 records. The coolest month is February at roughly 39°F.