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Weather & Climate
Islip, New York, United States
Overview
Climate data and monthly weather averages for Islip.
Key Metrics
Annual Avg
12.3°C
Summer Avg
21.9°C
Winter Avg
3.3°C
Record High
31.5°C
Record Low
-13.5°C
Annual Precipitation
1340.1 mm
Avg Humidity
81%
Summer Humidity
83%
Winter Humidity
81%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 14.3° | 2.1° | -12.4° | 106 | 81% | 58 | 86.1 |
| Feb | 12.4° | 2.1° | -13.5° | 103 | 80% | 77 | 77 |
| Mar | 15.1° | 4.3° | -8.8° | 121.5 | 81% | 119 | 74 |
| Apr | 20.6° | 8.5° | -0.9° | 112.2 | 83% | 150 | 79.2 |
| May | 24° | 13.3° | 3.4° | 101.4 | 86% | 174 | 61 |
| Jun | 27.6° | 19° | 10.6° | 108.6 | 86% | 184 | 54.5 |
| Jul | 31.5° | 23.2° | 15.4° | 105.1 | 83% | 192 | 51.8 |
| Aug | 30° | 23.4° | 16.8° | 107.3 | 80% | 169 | 89.3 |
| Sep | 28.5° | 20.5° | 12.1° | 94.8 | 79% | 133 | 69.3 |
| Oct | 25.9° | 15.4° | 4.7° | 131.1 | 78% | 94 | 103 |
| Nov | 19.2° | 10.1° | -3° | 106.5 | 79% | 64 | 75.5 |
| Dec | 17° | 5.6° | -9.3° | 142.6 | 81% | 49 | 78.7 |
Frequently Asked Questions
Sources: NASA POWER · Last updated: 2025
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