| NWS Forecast for: Lewis County Issued by: National Weather Service Buffalo, NY Last Update: 400 PM EDT Mon May 18 2026 |  |
Tonight: Mainly clear early, then partly cloudy with a chance of showers and thunderstorms through the early overnight. Mostly cloudy with a chance of showers late. Warm with lows in the mid 60s. Southwest winds 10 mph or less. Chance of rain 40 percent. Tuesday: Partly sunny with a chance of showers in the morning, then partly sunny with a chance of showers and thunderstorms in the afternoon. Warm with highs ranging from around 80 on the hilltops to the mid 80s across the lower elevations. Southwest winds 5 to 10 mph, increasing to 10 to 15 mph. Chance of rain 40 percent. Tuesday Night: Showers with a chance of thunderstorms in the evening, then showers overnight. Mild with lows in the mid 50s. Southwest winds 5 to 10 mph. Chance of rain 90 percent. Wednesday: Mostly cloudy with showers in the morning, then partly sunny with a chance of showers in the afternoon. Much cooler. Less humid with highs ranging from the lower 60s on the hilltops to the upper 60s across the lower elevations. West winds 5 to 10 mph, increasing to 10 to 15 mph. Chance of rain 90 percent. Wednesday Night: Partly cloudy and much cooler with lows in the upper 30s. West winds 5 to 10 mph, becoming light. Thursday: Mostly sunny. Highs in the upper 50s. Thursday Night: Partly cloudy. Lows in the upper 30s. Friday: Partly sunny. Highs in the mid 60s. Friday Night: Mostly cloudy with a 40 percent chance of showers. Lows in the lower 40s. Saturday: Showers likely. Highs in the lower 60s. Chance of rain 60 percent. Saturday Night: Showers likely. Lows in the mid 40s. Chance of rain 60 percent. Sunday: Showers likely. Highs in the mid 60s. Chance of rain 60 percent. Sunday Night: Mostly cloudy with a 40 percent chance of showers. Lows in the upper 40s. Memorial Day: Partly sunny with a chance of showers. Highs in the upper 60s. Chance of rain 40 percent. | |
| Zone Forecast: Lewis County | |
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