Temperature in Connecticut in September

Daytime highs, nighttime lows and the warmest cities in Connecticut, the United States of America this September.

Connecticut, the United States of America, a region in the United States of America, experiences high average maximum daytime temperatures in September, ranging from 23°C (73°F) in Cornwall Bridge to 25°C (77°F) in East Hartford. Nighttime temperatures generally drop to 14°C (57°F) in East Hartford and 11°C (52°F) in Cornwall Bridge. The month of September is in the summer season.

What is the temperature of the different cities in Connecticut, the United States of America in September?

Curious about the September temperatures in the prime spots of Connecticut? Navigate the map below and tap on a destination dot for more detailed stats.

Select a Month

Check the conditions for any month of the year.

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For a detailed overview over the year and the best time to visit Connecticut, check out our Connecticut's climate page.

See also: Connecticut weather by month.

Best Places to Visit in Connecticut in September

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across Connecticut.

Conditions Temperatures Precipitation
Avg daytime high -5°C (23°F) cold → 32°C (90°F) hot

Marker color shows the average daytime high temperature in September: blue is cold, red is hot.

See all September weather averages, cities and regions in Connecticut

Connecticut temperatures in September: frequently asked questions

How hot does it get in Connecticut, the United States of America in September?

Daytime temperatures in Mystic typically peak at 23°C (73°F) in September, putting it in the high range.

How cold does it get at night in Connecticut, the United States of America in September?

Nighttime temperatures in Mystic typically drop to around 14°C (57°F) in September.

What is the warmest city in September in Connecticut, the United States of America?

Based on our systematic data collection, East Hartford has been identified as the city with the highest average temperatures. The daytime temperature usually hovers around 25°C (77°F), while at night it goes down to an approximate temperature of 14°C (57°F).

What is the coldest city in September in Connecticut, the United States of America?

The coldest city in September in Connecticut, the United States of America is Cornwall Bridge when we check our database. The maximum daytime temperatures are around 23°C (73°F) and minimum nighttime temperatures fall around 11°C (52°F).

How much sun does Connecticut, the United States of America get in September?

Mystic enjoys close to 233 hours of sunlight. This not only brightens the days but also uplifts the atmosphere during the month.

Interested in more climate information?

We have much more information about the climate in Connecticut.

Weather and climate has detailed information for every country in the world. Are you going to the United States of America? Get detailed historical weather averages for many cities in the United States of America.

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