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Weather in Long Island for September 2025

Your guide to Long Island weather in September - trends and predictions

    Temperatures

  • In general, the average temperature in Long Island at the beginning of September is 23 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 19.7 °F by the end of September.

    • Rain 🌧️

  • Long Island experiences moderate rainfall in September, with an average of 8 rainy days and a total precipitation of 43.8 mm.

    • More

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Average dry days
22
Dry days
Average rainy days
8
Rainy days
Average snowy days
0
Snow days
Average temperatures
22°/16°
Temperatures
Average wind speed
19 km/h
Avg max wind
Average humidity
72 %
Avg humidity

Long Island Weather September

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

Temperatures trend during September in Long Island

See the weather trend as well as the moving average line

September weather in Long Island day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Moderate rain at times
Moderate rain at times
 25° /21° 1.4 mm 6
Sept. 2 Partly cloudy
Partly cloudy
 24° /18° 0 mm 6
Sept. 3 Sunny
Sunny
 22° /15° 0 mm 6
Sept. 4 Sunny
Sunny
 23° /15° 0 mm 6
Sept. 5 Sunny
Sunny
 22° /15° 0 mm 6
Sept. 6 Patchy rain possible
Patchy rain possible
 25° /17° 0.4 mm 6
Sept. 7 Moderate or heavy rain shower
Moderate or heavy rain shower
 20° /16° 5.3 mm 5
Sept. 8 Sunny
Sunny
 21° /13° 0 mm 6
Sept. 9 Partly cloudy
Partly cloudy
 22° /14° 0 mm 6
Sept. 10 Sunny
Sunny
 24° /16° 0 mm 6
Sept. 11 Partly cloudy
Partly cloudy
 22° /15° 0 mm 6
Sept. 12 Sunny
Sunny
 23° /15° 0 mm 6
Sept. 13 Sunny
Sunny
 23° /16° 0 mm 6
Sept. 14 Patchy rain possible
Patchy rain possible
 26° /17° 0.2 mm 6
Sept. 15 Partly cloudy
Partly cloudy
 24° /17° 0 mm 6
Sept. 16 Partly cloudy
Partly cloudy
 22° /15° 0 mm 6
Sept. 17 Overcast
Overcast
 22° /15° 0 mm 5
Sept. 18 Overcast
Overcast
 21° /18° 0 mm 5
Sept. 19 Moderate or heavy rain shower
Moderate or heavy rain shower
 24° /18° 10.1 mm 5
Sept. 20 Patchy rain possible
Patchy rain possible
 22° /18° 0.2 mm 5
Sept. 21 Sunny
Sunny
 23° /16° 0 mm 6
Sept. 22 Partly cloudy
Partly cloudy
 20° /16° 0 mm 6
Sept. 23 Cloudy
Cloudy
 20° /14° 0 mm 5
Sept. 24 Patchy rain possible
Patchy rain possible
 20° /15° 0.2 mm 5
Sept. 25 Overcast
Overcast
 19° /16° 0 mm 4
Sept. 26 Heavy rain at times
Heavy rain at times
 23° /17° 15.1 mm 5
Sept. 27 Overcast
Overcast
 20° /17° 4.6 mm 5
Sept. 28 Heavy rain at times
Heavy rain at times
 21° /17° 3.5 mm 5
Sept. 29 Patchy rain possible
Patchy rain possible
 17° /16° 2.8 mm 4
Sept. 30 Overcast
Overcast
 18° /15° 0 mm 4
Next
Important Notice
Our weather forecast for Long Island 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 Long Island forecast closer to your planned date for the most up-to-date weather information.
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Long Island in September - FAQ

What are the expected maximum and minimum temperatures in Long Island 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 Long Island during September?
In September, Long Island can expect light to moderate rainfall, totaling 43.8 mm across approximately 8 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Long Island during September?
The average wind speed in Long Island during September is 19 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Long Island

Explore the daily rainfall trends and prepare for Long Islands September weather 💧

UV exposure in Long Island during September

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

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Location coordinates Where is Long Island?

Get accurate weather forecasts for Long Island, located at latitude 40.817 and longitude -73.066. Stay updated with localized weather information tailored for Long Island.

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