Old Lyme (CT) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Old Lyme.
Climate overview of Old Lyme
Old Lyme, Connecticut, United States of America, sees big temperature differences between seasons, with July peaking at 28°C (82°F) and February dropping to 4°C (39°F).
With around 1289 mm (51 in) of annual rain/snowfall, Old Lyme has a notably wet climate. The wettest month is June. The sunniest month is July, with 9.8 hours of sunshine per day on average.
Old Lyme Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Old Lyme — and find the best time to visit.
Monthly Temperature in Old Lyme
Visitors to Old Lyme can expect significant temperature changes throughout the year. Average daytime temperatures reach a comfortable 28°C (82°F) in July. In February, the coolest month of the year, temperatures drop to a chilly 4°C (39°F).
At night, temperatures range from around 19°C (66°F) in July to -5°C (23°F) in February.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Old Lyme
Old Lyme is known for its substantial rain/snowfall, with annual precipitation reaching 1289 mm (51 in). Despite minor fluctuations, Old Lyme enjoys fairly consistent precipitation throughout the year. In June, you can expect around 135 mm (5.3 in) of precipitation, while in November, Old Lyme receives about 92 mm (3.6 in). For more details, please visit our Old Lyme Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Old Lyme
Old Lyme can be enjoyed more throughout the sunniest month of July under a blue sky, with approximately 9.8 hours of sunshine daily. In contrast, the city experiences much darker days in November, with only 4.6 hours of sunlight per day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Humidity in Old Lyme by Month
The relative humidity is high throughout the year in Old Lyme.
The city experiences its highest humidity in September, reaching 72%. In April, the humidity drops to its lowest level at 58%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Old Lyme
The weather does bring rainfall during this period, between 96 mm (3.8 in) and 135 mm (5.3 in). Planning your next adventure but unsure where to go? Our climate tool suggests perfect locations tailored to your preferred weather conditions. Discover your ideal travel destination with our weather planner.
Frequently asked questions about the climate in Old Lyme
What is the best time to visit Old Lyme?
May and July typically offer the most optimal weather in Old Lyme. In contrast, January, February, March and December tend to have less optimal conditions.
What temperatures can I expect in Old Lyme?
Daytime highs range from 4°C (39°F) in February to 28°C (82°F) in July. Nighttime lows range from -5°C (23°F) to 19°C (66°F). Temperatures vary considerably through the year.
How much rain does Old Lyme get?
Annual rainfall is around 1289 mm (51 in). June is the wettest month with 135 mm (5.3 in), while November is the driest with 92 mm (3.6 in).
How sunny is Old Lyme?
Old Lyme receives around 2,579 hours of sunshine per year. July is the sunniest month with 293 hours, while November is the cloudiest with just 139 hours. Overall, Old Lyme enjoys abundant sunshine.
Old Lyme 3-Day Forecast
Old Lyme (CT) 3-Day Forecast
Old Lyme on the map
Old Lyme is highlighted — select any city to see its climate.
Popular this month
Where to go in July — average daytime high across popular destinations.
Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
Yosemite National Park is definitely worth a visit
Vast forests, blue lakes, towering sequoias, and majestic waterfalls hint at the beauty of Yosemite National Park—a true natural masterpiece.
The 10 most alternative cities in the United States
Discover the top 10 fun and alternative U.S. cities rich in art, culture, and adventure. From Portland's hippy charm to Sedona's stunning landscapes.
Sedona: Explore Majestic Red Rock Landscapes
A picturesque artists' town surrounded by red rocks and known for its spirituality, vortex energy, and stunning hikes like Cathedral Rock.
10 most idyllic villages to visit in the United States
Discover 10 idyllic villages in the USA, from California to Vermont. Explore their unique charm, rich history, stunning nature, and vibrant arts scenes.