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Weather in Islip
Average Weather
| Month | Average monthly max temperature | Average monthly min temperature |
| January | 3°C | -1°C |
| February | 4°C | -1°C |
| March | 7°C | 2°C |
| April | 12°C | 7°C |
| May | 17°C | 12°C |
| June | 22°C | 17°C |
| July | 26°C | 21°C |
| August | 26°C | 21°C |
| September | 22°C | 18°C |
| October | 17°C | 13°C |
| November | 11°C | 6°C |
| December | 7°C | 2°C |