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Grenell, NY Weather Forecast
Grenell, NY Weather Forecast Date: 230 AM EDT Sat Sep 19 2026
The area/counties/county of: Jefferson, including the city of Watertown.or toggle through each period.
Overnight... Partly cloudy with some patchy fog developing late. Lows ranging from the lower 40s across the tug hill to the mid 40s along the lake Ontario shore. Light northeast winds.
Saturday... Some patchy fog in the morning, otherwise mostly sunny. Highs in the mid 60s. Light northeast winds.
Saturday Night... Partly cloudy in the evening, then mostly cloudy with a chance of showers overnight. Lows in the mid 40s. Light winds. Chance of rain 50%.
Sunday... Showers, cool with highs ranging from the mid 50s inland to around 60 along the lake Ontario shore. Light winds, becoming northeast 5 to 10 mph. Chance of rain 90%.
Sunday Night... Mostly cloudy and breezy. Lows ranging from the lower 40s across the tug hill to the upper 40s along the lake Ontario shore. Northeast winds 5 to 10 mph, becoming north.
Monday... Partly sunny. Highs in the upper 50s.
Monday Night... Mostly cloudy. Lows in the lower 40s.
Tuesday... Partly sunny. Highs in the lower 60s.
Tuesday Night... Partly cloudy. Lows in the lower 40s.
Wednesday... Mostly sunny. Highs in the mid 60s.
Wednesday Night... Mostly cloudy. Lows in the lower 40s.
Thursday... Partly sunny. Highs in the mid 60s.
Thursday Night... Mostly cloudy. Lows in the mid 40s.
POP = Probability of Precipitation
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