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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.
Fog/Mist
66°F
19°C
| Humidity | 96% |
| Wind Speed | S 6 mph |
| Barometer | 29.95 in (1014.3 mb) |
| Dewpoint | 65°F (18°C) |
| Visibility | 0.75 mi |
| Last update | 18 Jun 3:56 am EDT |
Extended Forecast for
Great River NY
Dense Fog Advisory until June 18, 07:00am
NOW until 7:00am Wed
Dense Fog Advisory
Overnight
Low: 65 °F
Chance
Showers and
Dense FogWednesday
High: 73 °F
Chance
Showers and
Dense Fog
then Showers
LikelyWednesday Night
Low: 66 °F
Showers
Likely then
Mostly CloudyJuneteenth
High: 81 °F
Partly Sunny
then Severe
ThunderstormsThursday Night
Low: 65 °F
Severe
Thunderstorms
then Chance
ShowersFriday
High: 80 °F
Sunny
Friday Night
Low: 64 °F
Mostly Clear
Saturday
High: 79 °F
Sunny
Detailed Forecast
Overnight
A 50 percent chance of showers, mainly after 5am. Widespread dense fog. Otherwise, cloudy, with a low around 65. Light south wind.
Wednesday
A chance of showers before 2pm, then a chance of showers and thunderstorms between 2pm and 5pm, then showers likely and possibly a thunderstorm after 5pm. Widespread dense fog, mainly before 7am. Otherwise, cloudy, with a high near 73. South wind 6 to 8 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 11pm. Mostly cloudy, with a low around 66. South wind around 5 mph becoming light and variable. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Juneteenth
A 30 percent chance of showers and thunderstorms after 2pm. Some of the storms could be severe. Increasing clouds, with a high near 81. South wind 6 to 14 mph.
Thursday Night
A chance of showers and thunderstorms before 11pm, then a chance of showers between 11pm and 2am. Some of the storms could be severe. Cloudy, then gradually becoming partly cloudy, with a low around 65. Southwest wind 10 to 14 mph. Chance of precipitation is 40%.
Friday
Sunny, with a high near 80.
Friday Night
Mostly clear, with a low around 64.
Saturday
Sunny, with a high near 79.
Saturday Night
Mostly cloudy, with a low around 66.
Sunday
Partly sunny, with a high near 80.
Sunday Night
Partly cloudy, with a low around 69.
Monday
Sunny, with a high near 84.
Monday Night
Mostly clear, with a low around 69.
Tuesday
Sunny, with a high near 85.
Additional Forecasts and Information
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Forecast AreaABOUT THIS FORECAST
Point Forecast:
Great River NY
40.72°N 73.16°W (Elev. 13 ft)
40.72°N 73.16°W (Elev. 13 ft)
3:06 am EDT Jun 18, 2025
4am EDT Jun 18, 2025-6pm EDT Jun 24, 2025
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