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Weather in New Haven, Connecticut for September 2026

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

    Temperatures

  • So far, September 2026 in New Haven is slightly warmer than the historical average by 1 °F.

  • The forecast for the next days in New Haven predicts temperatures to be around 17 °F, close to the historical average.

  • In general, the average temperature in New Haven at the beginning of September is 23.1 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 16.9 °F 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
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Moderate or heavy rain shower
24°
2
Partly cloudy
24°
3
Sunny
22°
4
Sunny
23°
5
Sunny
25°
6
Partly cloudy
23°
7
Heavy rain at times
21°
8
Sunny
23°
9
Partly cloudy
24°
10
Sunny
24°
11
Partly cloudy
25°
12
Partly cloudy
23°
13
Sunny
23°
14
Patchy rain possible
24°
15
Partly cloudy
21°
16
Cloudy
22°
17
Overcast
20°
18
Sunny
26°
19
Overcast
19°
20
Light rain shower
17°
21
Light rain shower
16°
22
Light rain shower
13°
23
Patchy rain possible
15°
24
Patchy rain possible
17°
25
Patchy rain possible
16°
26
Light rain shower
15°
27
Overcast
18°
28
Overcast
20°
29
Patchy rain possible
16°
30
Patchy rain possible
16°

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° 3.4 mm 4
Sept. 2 Partly cloudy
Partly cloudy
 24° /16° 0.2 mm 4
Sept. 3 Sunny
Sunny
 22° /15° 3.3 mm 4
Sept. 4 Sunny
Sunny
 23° /16° 0.5 mm 4
Sept. 5 Sunny
Sunny
 25° /17° 12.1 mm 7
Sept. 6 Partly cloudy
Partly cloudy
 23° /17° 4.2 mm 5
Sept. 7 Heavy rain at times
Heavy rain at times
 21° /14° 8.7 mm 5
Sept. 8 Sunny
Sunny
 23° /12° 0 mm 6
Sept. 9 Partly cloudy
Partly cloudy
 24° /14° 0.2 mm 5
Sept. 10 Sunny
Sunny
 24° /17° 0.2 mm 5
Sept. 11 Partly cloudy
Partly cloudy
 25° /15° 0 mm 7
Sept. 12 Partly cloudy
Partly cloudy
 23° /14° 0 mm 6
Sept. 13 Sunny
Sunny
 23° /16° 35 mm 4
Sept. 14 Patchy rain possible
Patchy rain possible
 24° /17° 0 mm 6
Sept. 15 Partly cloudy
Partly cloudy
 21° /15° 0 mm 6
Sept. 16 Cloudy
Cloudy
 22° /14° 0 mm 5
Sept. 17 Overcast
Overcast
 20° /15° 0 mm 5
Sept. 18 Sunny
Sunny
 26° /19° 1.5 mm 6.6
Sept. 19 Overcast
Overcast
 19° /13° 0 mm 6
Sept. 20 Light rain shower
Light rain shower
 17° /15° 9.2 mm 0.4
Sept. 21 Light rain shower
Light rain shower
 16° /13° 29.2 mm 4.4
Sept. 22 Light rain shower
Light rain shower
 13° /11° 44.5 mm 3
Sept. 23 Patchy rain possible
Patchy rain possible
 15° /11° 0.7 mm 4
Sept. 24 Patchy rain possible
Patchy rain possible
 17° /14° 0.8 mm 4
Sept. 25 Patchy rain possible
Patchy rain possible
 16° /12° 42.2 mm 4
Sept. 26 Light rain shower
Light rain shower
 15° /11° 8 mm 3
Sept. 27 Overcast
Overcast
 18° /12° 0 mm 4
Sept. 28 Overcast
Overcast
 20° /10° 0 mm 6
Sept. 29 Patchy rain possible
Patchy rain possible
 16° /12° 9.1 mm 4
Sept. 30 Patchy rain possible
Patchy rain possible
 16° /15° 1.3 mm 4
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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