easeweather.com
New Haven County (New Haven)
Akron (OH)Albuquerque (NM)Alexandria (VA)Anaheim (CA)Anchorage (AK)Arlington (VA)Atlanta (GA)Atlantic City (NJ)Austin (TX)Baltimore (MD)Baton Rouge (LA)Birmingham (AL)Boston (MA)Brooklyn (NY)Buffalo (NY)Cape Coral (FL)Charlotte (NC)Chattanooga (TN)Chicago (IL)Cincinnati (OH)Cleveland (OH)Colorado Springs (CO)Columbus (OH)Corpus Christi (TX)Dallas (TX)Dayton (OH)Denver (CO)Des Moines (IA)Detroit (MI)El Paso (TX)Fairbanks (AK)Fayetteville (NC)Fort Lauderdale (FL)Fort Wayne (IN)Fort Worth (TX)Gatlinburg (TN)Grand Rapids (MI)Harrisburg (PA)Honolulu (HI)Houston (TX)Huntsville (AL)Indianapolis (IN)Jackson (MS)Jacksonville (FL)Juneau (AK)Kansas City (MO)Ketchikan (AK)Key West (FL)Knoxville (TN)Las Vegas (NV)Lexington (KY)Lincoln (NE)Little Rock (AR)Los Angeles (CA)Louisville (KY)Madison (WI)Manhattan (NY)Memphis (TN)Miami (FL)Milwaukee (WI)Minneapolis (MN)Mobile (AL)Montgomery (AL)Nashville (TN)New Haven (CT)New Orleans (LA)New York City (NY)Newark (NJ)Oklahoma City (OK)Omaha (NE)Orlando (FL)Philadelphia (PA)Phoenix (AZ)Pittsburgh (PA)Portland (OR)Richmond (VA)Riverside (CA)Sacramento (CA)Salt Lake City (UT)San Antonio (TX)San Diego (CA)San Francisco (CA)San Jose (CA)Savannah (GA)Seattle (WA)Sitka (AK)Skagway (AK)Springfield (MO)St. Louis (MO)St. Petersburg (FL)Tallahassee (FL)Tampa (FL)Toledo (OH)Traverse City (MI)Tulsa (OK)Tyler (TX)Vancouver (WA)Virginia Beach (VA)WashingtonWichita (KS)Winston-Salem (NC) More Locations
United States weather

Weather in New Haven County, Connecticut for September 2025

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

    Official Weather Alert ⚠️

  • Rip Current Statement - See hour by hour.

    • Temperatures

  • Until now, September 2025 in New Haven County has been nearly identical to the historical average, with a temperature of 22.2 °F (showing only a slight deviation of -0.3 °F).

  • Expect cooler weather in the next days in New Haven County with the forecast suggesting a temperature of 20.7 °F, lower than the historical average.

  • In general, the average temperature in New Haven County at the beginning of September is 22.4 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 18.1 °F by the end of September.

    • Rain 🌧️

  • New Haven County experiences moderate rainfall in September, with an average of 6 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
24
Dry days
Average rainy days
6
Rainy days
Average snowy days
0
Snow days
Average temperatures
22°/15°
Temperatures
Average wind speed
18 km/h
Avg max wind
Average humidity
73 %
Avg humidity

New Haven County 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
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
Weather Alert Partly cloudy
22°
16
Weather Alert Partly cloudy
21°
17
Patchy rain possible
21°
18
Overcast
24°
19
Patchy rain possible
29°
20
Sunny
20°
21
Sunny
19°
22
Partly cloudy
20°
23
Partly cloudy
22°
24
Patchy rain possible
21°
25
Moderate rain
19°
26
Moderate rain
19°
27
Moderate rain
19°
28
Moderate rain
14°
29
Moderate rain at times
17°
30
Overcast
18°

Temperatures trend during September in New Haven County

See the weather trend as well as the moving average line

September weather in New Haven County 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° /15° 0 mm 1.4
Sept. 16 Partly cloudy
Partly cloudy
 21° /13° 0 mm 1.4
Sept. 17 Patchy rain possible
Patchy rain possible
 21° /14° 3 mm 1.2
Sept. 18 Overcast
Overcast
 24° /16° 0 mm 1.4
Sept. 19 Patchy rain possible
Patchy rain possible
 29° /17° 0.2 mm 0
Sept. 20 Sunny
Sunny
 20° /12° 0 mm 5
Sept. 21 Sunny
Sunny
 19° /11° 0 mm 5
Sept. 22 Partly cloudy
Partly cloudy
 20° /12° 0 mm 5
Sept. 23 Partly cloudy
Partly cloudy
 22° /14° 0.1 mm 5
Sept. 24 Patchy rain possible
Patchy rain possible
 21° /18° 0.4 mm 4
Sept. 25 Moderate rain
Moderate rain
 19° /18° 15.6 mm 4
Sept. 26 Moderate rain
Moderate rain
 19° /18° 5.3 mm 4
Sept. 27 Moderate rain
Moderate rain
 19° /15° 9.4 mm 4
Sept. 28 Moderate rain
Moderate rain
 14° /12° 17.3 mm 3
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 County 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 County forecast closer to your planned date for the most up-to-date weather information.
Change Month
‹
›

New Haven County in September - FAQ

What are the expected maximum and minimum temperatures in New Haven County 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 County during September?
In September, New Haven County can expect light to moderate rainfall, totaling 47.7 mm across approximately 6 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in New Haven County during September?
The average wind speed in New Haven County during September is 18 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in New Haven County

Explore the daily rainfall trends and prepare for New Haven Countys September weather 💧

UV exposure in New Haven County during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Top locations in New Haven County
Select a location for an accurate weather forecast
New Haven
More Locations

Quick links

More New Haven County weather pages
You are here
Location coordinates Where is New Haven County?

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

Found a mistake?
We appreciate your attention to details. Tell us here.