Connecticut Weather by Month — Temperature & Rainfall Guide

Connecticut is a region in the United States of America. Many people wonder what the weather conditions are in Connecticut over the year. What is the best time to visit Connecticut?

This page shows the average weather conditions by month in Connecticut over the year in: January, February, March, April, May, June, July, August, September, October, November, December.

In January the weather in Connecticut is generally poor. January is a winter month. The temperatures range from very low in Cornwall Bridge with 1°C (34°F) to low in Old Saybrook with 4°C (39°F). It is a very cold month in some areas, so be prepared and make sure to dress up warm.

Find more detailed climate information for Connecticut in January here.

In February the weather in Connecticut is generally poor. February is a winter month. The temperatures range from very low in Cornwall Bridge with 1°C (34°F) to low in Norwalk with 4°C (39°F). On average, this month is one of the coldest months of the year in Connecticut. So be prepared and make sure to dress up warm.

Find more detailed climate information for Connecticut in February here.

In March the weather in Connecticut is generally poor. The average maximum daytime temperatures are low and range from 7°C (45°F) in Cornwall Bridge to 10°C (50°F) in Norwalk.

Find more detailed climate information for Connecticut in March here.

In April the weather in Connecticut ranges from unpleasant in Danbury to tolerable in Mystic. The average maximum daytime temperatures are moderate and range from 14°C (57°F) in Mystic to 16°C (61°F) in Windsor Locks.

Find more detailed climate information for Connecticut in April here.

In May the weather in Connecticut ranges from pleasant in Mystic to perfect in Milford. The temperatures range from pleasant in Mystic with 19°C (66°F) to high in Windsor Locks with 22°C (72°F).

Find more detailed climate information for Connecticut in May here.

In June the weather in Connecticut is generally pleasant. June is a summer month. The average maximum daytime temperatures are high and range from 23°C (73°F) in Mystic to 26°C (79°F) in Enfield.

Find more detailed climate information for Connecticut in June here.

In July the weather in Connecticut ranges from tolerable in Windsor Locks to perfect in Groton. July is a summer month. The average maximum daytime temperatures are high and range from 27°C (81°F) in Mystic to 30°C (86°F) in Windsor Locks. On average, this month is one of the warmest months of the year in Connecticut. So be prepared and make sure to dress lightly.

Find more detailed climate information for Connecticut in July here.

In August the weather in Connecticut ranges from pleasant in Danbury to perfect in Mystic. August is a summer month. The average maximum daytime temperatures are high and range from 26°C (79°F) in Cornwall Bridge to 29°C (84°F) in Windsor Locks.

Find more detailed climate information for Connecticut in August here.

In September the weather in Connecticut ranges from pleasant in Danbury to perfect in Mystic. September is a summer month. The average maximum daytime temperatures are high and range from 23°C (73°F) in Cornwall Bridge to 25°C (77°F) in East Hartford.

Find more detailed climate information for Connecticut in September here.

In October the weather in Connecticut ranges from unpleasant in Danbury to pleasant in Stratford. The temperatures range from moderate in Cornwall Bridge with 16°C (61°F) to pleasant in Stamford with 18°C (64°F).

Find more detailed climate information for Connecticut in October here.

In November the weather in Connecticut ranges from poor in Norwich to unpleasant in Mystic. The temperatures range from low in Cornwall Bridge with 10°C (50°F) to moderate in Milford with 12°C (54°F).

Find more detailed climate information for Connecticut in November here.

In December the weather in Connecticut is generally poor. December is a winter month. The average maximum daytime temperatures are low and range from 4°C (39°F) in Cornwall Bridge to 8°C (46°F) in Old Saybrook.

Find more detailed climate information for Connecticut in December here.