Weather World
Grass River Flow, NY 7-Day Night Weather Forecast
Quick Weather Clicks
Settings
Sun & Moon
Weather Quote O' the Day
Grass River Flow, NY Weather Forecast
Grass River Flow, NY Weather Forecast Date: 625 PM EDT Wed Sep 02 2026
The area/counties/county of: Southeastern St. Lawrence, including the cities of: South Colton and Star Lake.or toggle through each period.
Tonight... Cloudy. A chance of showers and thunderstorms until midnight, then showers likely with a slight chance of thunderstorms after midnight. Some thunderstorms May produce heavy rainfall. Lows in the lower 60s. South winds 10 to 15 mph. Chance of rain 70%.
Thursday... Mostly cloudy with a chance of showers with a slight chance of thunderstorms in the morning, then partly sunny with a slight chance of showers in the afternoon. Humid with highs in the mid 70s. Light and variable winds, becoming west around 10 mph in the afternoon. Chance of rain 40%.
Thursday Night... Partly cloudy. Lows in the upper 50s. Light and variable winds.
Friday... Partly sunny. Highs in the lower 70s. Northwest winds around 10 mph.
Friday Night... Partly cloudy. Lows around 50. Light and variable winds.
Saturday... Partly sunny. Highs in the upper 60s.
Saturday Night... Mostly clear. Lows in the upper 40s. Highs around 70.
Sunday... Mostly clear. Lows in the upper 40s. Highs around 70.
Sunday Night... Clear. Lows in the upper 40s.
Labor Day... Partly sunny. Highs in the lower 70s.
Monday Night... Partly cloudy with a 30% chance of showers. Lows in the lower 50s.
Tuesday... Partly cloudy. Highs in the upper 60s. Lows in the upper 40s.
Tuesday Night... Partly cloudy. Highs in the upper 60s. Lows in the upper 40s.
POP = Probability of Precipitation
Grass River Flow Radar Loop
Use the map search tool if you want to place a location marker on the radar map...