Rocky Neck Weather
Rocky Neck has a mild coastal climate: NOAA's 1991–2020 normals for the nearest weather station, Groton–New London airport, give an average July high of 79.8°F and a January low of 23.3°F, with about 3 to 4 inches of precipitation in most months. Beach weather runs from late May to early September, with July and August the warmest. For today's conditions, use the National Weather Service forecast for East Lyme.
Weather at a Glance
Live Forecast
The most useful forecast for the park is the National Weather Service point forecast for the Niantic shore: forecast.weather.gov for Niantic, CT. It includes hourly temperature, wind and rain chances and any marine or heat advisories. Check the water quality report and tides the same morning.
Month by Month
Average daily high and low temperatures and precipitation, NOAA 1991–2020 normals for Groton–New London airport, about 10 miles east of the park:
- January: 38.3°F / 23.3°F, 2.68 in.
- February: 40.2°F / 24.6°F, 2.20 in.
- March: 46.6°F / 30.7°F, 3.82 in.
- April: 56.2°F / 39.1°F, 3.58 in.
- May: 64.8°F / 48.8°F, 3.31 in.
- June: 73.8°F / 58.2°F, 3.30 in.
- July: 79.8°F / 64.8°F, 3.24 in.
- August: 79.2°F / 63.8°F, 3.32 in.
- September: 73.5°F / 56.9°F, 3.83 in.
- October: 63.2°F / 45.6°F, 3.66 in.
- November: 53.3°F / 36.8°F, 3.24 in.
- December: 43.9°F / 29.0°F, 3.13 in.
Best Time to Visit
- For swimming: July and August are the warmest months, and DEEP runs its weekly water testing from Memorial Day to Labor Day. Searches for the park peak in July.
- For camping: the campground is open from mid-May to late September. June and September nights average in the upper 50s°F. Camping.
- For hiking and birding: spring brings the alewife run up Bride Brook and ospreys by early summer; fall brings herons, cranes and swans to the marsh. Highs in the 60s°F make May and October comfortable for the 2.5-mile loop. Hiking.
- For fishing: the jetty is open all year, and the whole beach opens to fishing from September 15. Fishing.
- For a quiet beach walk: out-of-state parking fees end October 31.
Why the Sea Is Calm
DEEP points out that Long Island and Fishers Island shelter the Connecticut coast from the open Atlantic, so the waves at Rocky Neck's beach are usually small even on breezy days.
Winter
The park stays open 8 a.m. to sunset all year. January and February average highs around 40°F, and when snow falls DEEP lists snowshoeing and cross-country skiing on the trails.
Plan Around the Weather
Check the NWS forecast for advisories before you set up on the sand. The park closes at sunset in every season (hours).
Rocky Neck Weather FAQ
What is the weather like at Rocky Neck State Park in summer?
Warm and mild. NOAA's 1991–2020 normals for nearby Groton–New London airport give July an average high of 79.8°F and a low of 64.8°F.
When is the best time to visit Rocky Neck?
July and August for swimming, mid-May to late September for camping, and spring or fall for hiking and birding around the Bride Brook marsh.
Where can I get a forecast for Rocky Neck State Park?
The National Weather Service point forecast for the Niantic shore on forecast.weather.gov.
Is Rocky Neck open in winter?
Yes, 8 a.m. to sunset every day. DEEP lists snowshoeing and cross-country skiing on the trails when there is snow.