Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Mostly Cloudy
69°F
21°C
| Humidity | 96% |
| Wind Speed | E 7 mph |
| Barometer | 29.90 in (1012.5 mb) |
| Dewpoint | 68°F (20°C) |
| Visibility | 10.00 mi |
| Last update | 23 Aug 12:56 am EDT |
Extended Forecast for
Mount Sinai NY
Overnight
Low: 66 °F
Showers
Likely and
Patchy FogSunday
High: 80 °F
Showers
Likely then
Chance
T-stormsSunday Night
Low: 65 °F
Chance
T-storms then
ClearMonday
High: 79 °F
Sunny
Monday Night
Low: 63 °F
Mostly Clear
Tuesday
High: 78 °F
Sunny
Tuesday Night
Low: 66 °F
Mostly Clear
Wednesday
High: 79 °F
Sunny
Wednesday Night
Low: 68 °F
Partly Cloudy
Detailed Forecast
Overnight
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 5am. Patchy fog. Otherwise, mostly cloudy, with a low around 66. East wind around 6 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Sunday
Showers likely and possibly a thunderstorm before 11am, then a chance of showers and thunderstorms after 11am. Partly sunny, with a high near 80. East wind 7 to 9 mph becoming south in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Sunday Night
A chance of thunderstorms before 8pm. Mostly cloudy, then gradually becoming clear, with a low around 65. West wind 6 to 8 mph. Chance of precipitation is 30%.
Monday
Sunny, with a high near 79. Southwest wind 6 to 10 mph.
Monday Night
Mostly clear, with a low around 63. West wind around 8 mph.
Tuesday
Sunny, with a high near 78.
Tuesday Night
Mostly clear, with a low around 66.
Wednesday
Sunny, with a high near 79.
Wednesday Night
Partly cloudy, with a low around 68.
Thursday
Mostly sunny, with a high near 79.
Thursday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 68.
Friday
A 30 percent chance of showers. Partly sunny, with a high near 80.
Friday Night
Partly cloudy, with a low around 68.
Saturday
Mostly sunny, with a high near 80.
Additional Forecasts and Information
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Forecast AreaABOUT THIS FORECAST
Point Forecast:
Mount Sinai NY
40.95°N 73.02°W (Elev. 56 ft)
40.95°N 73.02°W (Elev. 56 ft)
10:43 pm EDT Aug 22, 2026
1am EDT Aug 23, 2026-6pm EDT Aug 29, 2026
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