Chatham Lighthouse Beach Water Temperature
Sea-surface temperature at Chatham Lighthouse Beach, Massachusetts · times in EDT
Updated 4:00 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 |
|---|---|---|---|
| Tue, Oct 13 | 62° / 54° | 2 | 16% |
| Wed, Oct 14 | 71° / 62° | 5 | 37% |
| Thu, Oct 15 | 60° / 49° | 5 | 2% |
| Fri, Oct 16 | 65° / 49° | 2 | 77% |
| Sat, Oct 17 | 54° / 39° | 4 | 52% |
| Sun, Oct 18 | 52° / 37° | 4 | 2% |
| Mon, Oct 19 | 57° / 48° | 4 | 4% |
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 60°F, the water at Chatham Lighthouse Beach is chilly — wetsuit recommended. 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° below the October average of 61°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 60°F. That is 1° below the October average of 61°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.