United StatesThe weather in September in Connecticut
It's warm in September in Connecticut with an average temperature of 24°C. Temperatures this month range from a low of 18°C to a high of 28°C. At night, you can expect temperatures between 11°C and 17°C.
Looking for sun? September isn’t a good month to be in Connecticut. The temperature is nice, but there’s too much chance of rain.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in September for Connecticut, United States. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Temperature records
With 35°C in 2015, Connecticut reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 14°C in 2017. The extreme nighttime temperatures ranged from a lowest recorded value of 2°C to a highest value of 22°C.
Rainfall amount
In September, there is an average of 104 mm of precipitation, spread over 13 days. The wind speed is around 3 Bft, mostly coming from the South.
Daily weather in September for Connecticut
Click on any day in September to get detailed info about the usual weather on that day in Connecticut. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| Connecticut | New York | |
|---|---|---|
| Average temperature | 24°C | 27°C |
| Max. temperature | 28°C | 31°C |
| Min. temperature | 11°C | -5°C |
| Total precipitation | 104 mm | 57 mm |
| Rainy days | 13 days | 9 days |
Start of September
The month of September starts in Connecticut with warm temps, averaging around 26°C during the day and nights around 17°C.
Mid September
By mid-September, daytime temps drop to around 24°C, with nights around 14°C. There’s a chance of some showers during this time, but plenty of dry and sunny days too.
End of September
By the end of September, the average daytime temperature in Connecticut is around 23°C, while nighttime temps are about 13°C. Expect regular precipitation, but if you’re lucky, you’ll also get some dry and sunny days.
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UV index
The UV index is a maximum of 5 this month. That's a moderate value on the intensity scale of 1 to 11. Unprotected skin can burn in about 30 minutes.
Check out the climate of Connecticut for all months and discover the best travel time
The climate in Connecticut is based on weather data from . Other places, like New York City, Miami or Los Angeles, might have different weather. You can check out all destinations in Connecticut to get the full picture of the climate.
Temperature charts
These charts show the average temperatures in September in Connecticut, United States. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in Connecticut
Temperature in September in Connecticut over the years
Precipitation charts
These charts show the average amount of precipitation in September in Connecticut, United States. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in September in Connecticut
Total precipitation in September in Connecticut over the years
Daily UV index in September in Connecticut
This chart shows the average daily UV index in September in Connecticut, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Weather experiences in September in Connecticut
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Average weather in Connecticut by month
Click on a month below to see detailed weather info for Connecticut. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.