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United States weather

Weather in New Haven, Connecticut for September 2026

Your guide to New Haven weather in September - trends and predictions

    Temperatures

  • In general, the average temperature in New Haven at the beginning of September is 22.4 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 21.4 °C by the end of September.

    • Rain 🌧️

  • New Haven experiences moderate rainfall in September, with an average of 10 rainy days and a total precipitation of 108.6 mm.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
20
Dry days
Average rainy days
10
Rainy days
Average snowy days
0
Snow days
Average temperatures
22°/16°
Temperatures
Average wind speed
17 km/h
Avg max wind
Average humidity
75 %
Avg humidity

New Haven Weather September

Move between months or click on a day
August
October
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Moderate or heavy rain shower
24°
2
Partly cloudy
25°
3
Sunny
20°
4
Sunny
21°
5
Sunny
24°
6
Partly cloudy
24°
7
Heavy rain at times
19°
8
Sunny
22°
9
Partly cloudy
23°
10
Sunny
22°
11
Partly cloudy
24°
12
Partly cloudy
22°
13
Sunny
23°
14
Patchy rain possible
25°
15
Partly cloudy
22°
16
Cloudy
21°
17
Overcast
20°
18
Overcast
23°
19
Overcast
25°
20
Overcast
22°
21
Sunny
20°
22
Partly cloudy
20°
23
Cloudy
23°
24
Cloudy
21°
25
Overcast
19°
26
Heavy rain at times
24°
27
Patchy rain possible
22°
28
Patchy rain possible
23°
29
Moderate rain at times
20°
30
Overcast
21°

Temperatures trend during September in New Haven

See the weather trend as well as the moving average line

September weather in New Haven day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Moderate or heavy rain shower
Moderate or heavy rain shower
 24° /18° 2.8 mm 6
Sept. 2 Partly cloudy
Partly cloudy
 25° /16° 0 mm 6
Sept. 3 Sunny
Sunny
 20° /13° 0 mm 5
Sept. 4 Sunny
Sunny
 21° /14° 0 mm 5
Sept. 5 Sunny
Sunny
 24° /17° 18 mm 6
Sept. 6 Partly cloudy
Partly cloudy
 24° /17° 2.5 mm 6
Sept. 7 Heavy rain at times
Heavy rain at times
 19° /14° 13 mm 5
Sept. 8 Sunny
Sunny
 22° /10° 0 mm 6
Sept. 9 Partly cloudy
Partly cloudy
 23° /13° 0 mm 6
Sept. 10 Sunny
Sunny
 22° /14° 0 mm 6
Sept. 11 Partly cloudy
Partly cloudy
 24° /14° 0 mm 7
Sept. 12 Partly cloudy
Partly cloudy
 22° /15° 0 mm 6
Sept. 13 Sunny
Sunny
 23° /15° 0 mm 6
Sept. 14 Patchy rain possible
Patchy rain possible
 25° /18° 0.1 mm 6
Sept. 15 Partly cloudy
Partly cloudy
 22° /16° 0 mm 6
Sept. 16 Cloudy
Cloudy
 21° /14° 0 mm 5
Sept. 17 Overcast
Overcast
 20° /15° 0 mm 5
Sept. 18 Overcast
Overcast
 23° /16° 22.4 mm 5
Sept. 19 Overcast
Overcast
 25° /18° 0 mm 6
Sept. 20 Overcast
Overcast
 22° /15° 0 mm 6
Sept. 21 Sunny
Sunny
 20° /15° 0.1 mm 5
Sept. 22 Partly cloudy
Partly cloudy
 20° /14° 0 mm 6
Sept. 23 Cloudy
Cloudy
 23° /16° 0 mm 6
Sept. 24 Cloudy
Cloudy
 21° /15° 0 mm 5
Sept. 25 Overcast
Overcast
 19° /16° 12.1 mm 5
Sept. 26 Heavy rain at times
Heavy rain at times
 24° /18° 11 mm 6
Sept. 27 Patchy rain possible
Patchy rain possible
 22° /17° 1.5 mm 6
Sept. 28 Patchy rain possible
Patchy rain possible
 23° /17° 24 mm 5
Sept. 29 Moderate rain at times
Moderate rain at times
 20° /16° 1.2 mm 5
Sept. 30 Overcast
Overcast
 21° /15° 0 mm 5
Next
Important Notice
Our weather forecast for New Haven in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the New Haven forecast closer to your planned date for the most up-to-date weather information.
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New Haven in September - FAQ

What are the expected maximum and minimum temperatures in New Haven during September?

During September, expect a variety of temperatures with highs around 22° and lows near 16°, suitable for diverse activities and preferences.

How much rainfall should be expected in New Haven during September?

Significant rainfall exceeding 108.6 mm is expected in New Haven during September, occurring over more than 10 days. Preparing for wet conditions is recommended in your planning.

What are the typical wind conditions in New Haven during September?

The average wind speed in New Haven during September is 17 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in New Haven

Explore the daily rainfall trends and prepare for New Havens September weather 💧
Typically, New Haven has 10 rainy days in September with a total of 108.6 mm of rainfall.

UV exposure in New Haven during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

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Location coordinates Where is New Haven?

Get accurate weather forecasts for New Haven, located at latitude 41.308 and longitude -72.928. Stay updated with localized weather information tailored for New Haven.

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