New Haven County (New Haven)
September
Weather in New Haven County, Connecticut for September 2027
Your guide to New Haven County weather in September - trends and predictions
In general, the average temperature in New Haven County at the beginning of September is 23.1 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 20.1 °C by the end of September.
New Haven County experiences moderate rainfall in September, with an average of 8 rainy days and a total precipitation of 146 mm.
Is September a good time to visit New Haven County? check out the best time to travel to New Haven County page.
✨ Is September a good time to visit New Haven County? – Ask the AI Weatherman
Temperatures
Rain 🌧️
More
22
Dry days
8
Rainy days
0
Snow days
22°/16°
Temperatures
18 km/h
Avg max wind
75 %
Avg humidity
New Haven County Weather September
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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
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Light rain | 24° /19° | 3.4 mm | 4 | |
| Sept. 2 |  Partly cloudy | 24° /17° | 0.2 mm | 4 | |
| Sept. 3 | Light rain | 22° /15° | 3.3 mm | 4 | |
| Sept. 4 |  Sunny | 23° /17° | 0.5 mm | 4 | |
| Sept. 5 |  Moderate rain | 25° /17° | 12.1 mm | 7 | |
| Sept. 6 | Light rain | 23° /17° | 4.2 mm | 5 | |
| Sept. 7 |  Heavy rain at times | 21° /14° | 8.7 mm | 5 | |
| Sept. 8 | Sunny | 22° /12° | 0 mm | 6 | |
| Sept. 9 | Partly cloudy | 24° /14° | 0.2 mm | 5 | |
| Sept. 10 | Sunny | 24° /17° | 0.2 mm | 5 | |
| Sept. 11 | Partly cloudy | 24° /16° | 0 mm | 7 | |
| Sept. 12 | Partly cloudy | 22° /15° | 0 mm | 6 | |
| Sept. 13 |  Heavy rain | 23° /17° | 35 mm | 4 | |
| Sept. 14 |  Patchy rain possible | 24° /17° | 0 mm | 6 | |
| Sept. 15 | Partly cloudy | 21° /15° | 0 mm | 6 | |
| Sept. 16 |  Cloudy | 22° /15° | 0 mm | 5 | |
| Sept. 17 |  Overcast | 22° /16° | 0.4 mm | 5 | |
| Sept. 18 | Moderate rain | 24° /17° | 14.9 mm | 5 | |
| Sept. 19 | Overcast | 23° /17° | 0 mm | 5 | |
| Sept. 20 | Light rain | 21° /15° | 6 mm | 4 | |
| Sept. 21 | Overcast | 20° /15° | 0.9 mm | 4 | |
| Sept. 22 | Overcast | 20° /14° | 0.1 mm | 4 | |
| Sept. 23 | Cloudy | 21° /14° | 0 mm | 4 | |
| Sept. 24 | Cloudy | 21° /13° | 0 mm | 5 | |
| Sept. 25 | Light rain | 19° /15° | 9.7 mm | 3 | |
| Sept. 26 | Heavy rain at times | 21° /16° | 16.4 mm | 4 | |
| Sept. 27 | Light rain | 20° /16° | 7.7 mm | 4 | |
| Sept. 28 | Moderate rain | 20° /15° | 21.1 mm | 4 | |
| Sept. 29 | Overcast | 20° /15° | 0.8 mm | 4 | |
| Sept. 30 | Overcast | 20° /15° | 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 16°, suitable for diverse activities and preferences.
How much rainfall should be expected in New Haven County during September?
Significant rainfall exceeding 146 mm is expected in New Haven County during September, occurring over more than 8 days. Preparing for wet conditions is recommended in your planning.
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 💧
Typically, New Haven County has 8 rainy days in September with a total of 146 mm of rainfall.
UV exposure in New Haven County during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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