Glastonbury (CT) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Glastonbury.
Climate overview of Glastonbury
Glastonbury, Connecticut, United States of America, experiences significant temperature variation throughout the year. Summers bring daytime highs of 29°C (84°F) in July, while winters cool to 3°C (37°F) in January.
The city has a wet climate, receiving around 1227 mm (48 in) of rain/snowfall per year. Despite the high annual total, it has warm summers and cold winters. June is the wettest month. July is the sunniest month, averaging 9.8 hours of sunshine per day.
Glastonbury Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Glastonbury - and find the best time to visit.
Monthly Temperature in Glastonbury
Depending on the time of the year, temperatures range from comfortable to chilly in Glastonbury. On average, daytime temperatures range from a comfortable 29°C (84°F) in July to a chilly 3°C (37°F) in January.
Nighttime temperatures range from 19°C (66°F) in July to -7°C (19°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Glastonbury
Glastonbury has a relatively rain/snowy climate with high precipitation levels, averaging 1227 mm (48 in) of rain/snowfall annually. The amount of precipitation varies moderately throughout the year. The wettest month, June, sees around 150 mm (5.9 in) of rainfall, perfect for those who enjoy a bit of rain now and then. The driest month, January, still receives a respectable 81 mm (3.2 in) of snow/rainfall. For more details, please visit our Glastonbury 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 Glastonbury
In Glastonbury, summer days are longer and more sunny, with daily sunshine hours peaking at 9.8 hours in July. As the darker season arrives, the brightness of the sun becomes less. November sees a soft sun for only 4.6 hours per average day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Humidity in Glastonbury by Month
The relative humidity is high throughout the year in Glastonbury.
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 Glastonbury
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: May and September
- Warmest weather: July and August
- Most sunshine: July
- Fewest rainy days: February, March, September and November
- Seasonal pattern: Warm summers and cold winters
- Coldest conditions: January, with freezing nights around -7°C (19°F).
Frequently asked questions about the climate in Glastonbury
What is the best time to visit Glastonbury?
May and September typically offer the most optimal weather in Glastonbury. In contrast, January, February, March and December tend to have less optimal conditions. Glastonbury has warm summers and cold winters.
What temperatures can I expect in Glastonbury?
Daytime highs range from 3°C (37°F) in January to 29°C (84°F) in July. Nighttime lows range from -7°C (19°F) to 19°C (66°F). Temperatures vary considerably through the year.
How much rain does Glastonbury get?
Annual rainfall is around 1227 mm (48 in). June is the wettest month with 150 mm (5.9 in), while January is the driest with 81 mm (3.2 in).
How sunny is Glastonbury?
Glastonbury 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, Glastonbury enjoys abundant sunshine.
Glastonbury 3-Day Forecast
Glastonbury on the map
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