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Hazardous Weather Conditions
Current conditions at
Islip, Long Island Mac Arthur Airport (KISP)
Lat: 40.79°NLon: 73.1°WElev: 98ft.
Fair
77°F
25°C
| Humidity | 66% |
| Wind Speed | SW 14 G 20 mph |
| Barometer | 29.80 in (1008.9 mb) |
| Dewpoint | 65°F (18°C) |
| Visibility | 10.00 mi |
| Heat Index | 79°F (26°C) |
| Last update | 13 Aug 1:56 am EDT |
Extended Forecast for
Smithtown NY
Overnight
Low: 70 °F
Showers
LikelyThursday
High: 85 °F
Showers
Likely then
Slight Chance
T-stormsThursday Night
Low: 68 °F
Partly Cloudy
Friday
High: 85 °F
Sunny
Friday Night
Low: 64 °F
Partly Cloudy
Saturday
High: 82 °F
Sunny
Saturday Night
Low: 64 °F
Partly Cloudy
Sunday
High: 82 °F
Mostly Sunny
then Chance
ShowersSunday Night
Low: 67 °F
Showers
Likely
Detailed Forecast
Overnight
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 5am. Cloudy, with a low around 70. Light west wind. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday
Showers and thunderstorms likely before 2pm, then a slight chance of showers. Cloudy, then gradually becoming mostly sunny, with a high near 85. Southwest wind 5 to 8 mph becoming northwest in the morning. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday Night
Partly cloudy, with a low around 68. Northwest wind 3 to 5 mph.
Friday
Sunny, with a high near 85. Northwest wind 7 to 10 mph.
Friday Night
Partly cloudy, with a low around 64. West wind around 6 mph becoming light and variable.
Saturday
Sunny, with a high near 82.
Saturday Night
Partly cloudy, with a low around 64.
Sunday
A 30 percent chance of showers after 2pm. Mostly sunny, with a high near 82.
Sunday Night
Showers likely, mainly after 2am. Mostly cloudy, with a low around 67. Chance of precipitation is 60%.
Monday
Showers likely, mainly before 8am. Partly sunny, with a high near 83. Chance of precipitation is 60%.
Monday Night
Partly cloudy, with a low around 67.
Tuesday
Sunny, with a high near 83.
Tuesday Night
Mostly clear, with a low around 67.
Wednesday
Mostly sunny, with a high near 84.
Additional Forecasts and Information
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Forecast AreaABOUT THIS FORECAST
Point Forecast:
Smithtown NY
40.86°N 73.19°W (Elev. 98 ft)
40.86°N 73.19°W (Elev. 98 ft)
9:00 pm EDT Aug 12, 2026
2am EDT Aug 13, 2026-6pm EDT Aug 19, 2026
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