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Weather in New Haven, Connecticut for September 2025

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 22.3 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 19.1 °F by the end of September.

    • Rain 🌧️

  • New Haven experiences moderate rainfall in September, with an average of 7 rainy days and a total precipitation of 47.7 mm.

    • More

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

Average dry days
23
Dry days
Average rainy days
7
Rainy days
Average snowy days
0
Snow days
Average temperatures
22°/15°
Temperatures
Average wind speed
18 km/h
Avg max wind
Average humidity
74 %
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
25°
2
Partly cloudy
24°
3
Sunny
21°
4
Sunny
22°
5
Sunny
21°
6
Partly cloudy
23°
7
Heavy rain at times
20°
8
Sunny
20°
9
Partly cloudy
23°
10
Sunny
24°
11
Partly cloudy
22°
12
Partly cloudy
23°
13
Sunny
24°
14
Patchy rain possible
25°
15
Partly cloudy
23°
16
Cloudy
22°
17
Overcast
22°
18
Overcast
23°
19
Overcast
24°
20
Overcast
23°
21
Sunny
22°
22
Partly cloudy
20°
23
Cloudy
20°
24
Cloudy
19°
25
Overcast
17°
26
Heavy rain at times
22°
27
Patchy rain possible
20°
28
Patchy rain possible
21°
29
Moderate rain at times
17°
30
Overcast
18°

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
 25° /20° 5.6 mm 6
Sept. 2 Partly cloudy
Partly cloudy
 24° /16° 0 mm 6
Sept. 3 Sunny
Sunny
 21° /11° 0 mm 6
Sept. 4 Sunny
Sunny
 22° /13° 0 mm 6
Sept. 5 Sunny
Sunny
 21° /15° 0 mm 6
Sept. 6 Partly cloudy
Partly cloudy
 23° /13° 0 mm 6
Sept. 7 Heavy rain at times
Heavy rain at times
 20° /14° 8.6 mm 5
Sept. 8 Sunny
Sunny
 20° /10° 0 mm 6
Sept. 9 Partly cloudy
Partly cloudy
 23° /12° 0 mm 6
Sept. 10 Sunny
Sunny
 24° /15° 0 mm 6
Sept. 11 Partly cloudy
Partly cloudy
 22° /13° 0 mm 6
Sept. 12 Partly cloudy
Partly cloudy
 23° /13° 0 mm 6
Sept. 13 Sunny
Sunny
 24° /14° 0 mm 6
Sept. 14 Patchy rain possible
Patchy rain possible
 25° /17° 0.1 mm 6
Sept. 15 Partly cloudy
Partly cloudy
 23° /16° 0 mm 6
Sept. 16 Cloudy
Cloudy
 22° /13° 0 mm 5
Sept. 17 Overcast
Overcast
 22° /15° 0 mm 5
Sept. 18 Overcast
Overcast
 23° /16° 0 mm 5
Sept. 19 Overcast
Overcast
 24° /18° 0 mm 5
Sept. 20 Overcast
Overcast
 23° /18° 0 mm 5
Sept. 21 Sunny
Sunny
 22° /15° 0.1 mm 6
Sept. 22 Partly cloudy
Partly cloudy
 20° /14° 0 mm 6
Sept. 23 Cloudy
Cloudy
 20° /13° 0 mm 5
Sept. 24 Cloudy
Cloudy
 19° /12° 0 mm 4
Sept. 25 Overcast
Overcast
 17° /14° 5.6 mm 4
Sept. 26 Heavy rain at times
Heavy rain at times
 22° /16° 22 mm 5
Sept. 27 Patchy rain possible
Patchy rain possible
 20° /18° 3 mm 5
Sept. 28 Patchy rain possible
Patchy rain possible
 21° /17° 0.3 mm 5
Sept. 29 Moderate rain at times
Moderate rain at times
 17° /15° 2.4 mm 4
Sept. 30 Overcast
Overcast
 18° /14° 0 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 15°, suitable for diverse activities and preferences.
How much rainfall should be expected in New Haven during September?
In September, New Haven can expect light to moderate rainfall, totaling 47.7 mm across approximately 7 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in New Haven during September?
The average wind speed in New Haven during September is 18 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 💧

UV exposure in New Haven during September

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

Quick links

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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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