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Borough of Northumberland, PANorthumberland, PA 7-Day Weather Forecast
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Northumberland Weather Forecast
Northumberland, PA Weather Forecast Date: 600 PM EDT Thu Aug 13 2026
Weather forecast for Northumberland, PA
Tonight Lo: 61°F Lo: 16°C |
Tonight... Mostly cloudy this evening, then becoming partly cloudy. Patchy fog after midnight. Lows in the lower 60s. Northwest winds around 5 mph this evening, becoming light and variable. |
| Fri Hi: 81°FHi: 27°C Lo: 61°F Lo: 16°C |
Friday... Patchy fog in the morning. Partly sunny. Highs in the lower 80s. Light and variable winds, becoming west around 5 mph in the afternoon. |
Sat Hi: 81°FHi: 27°C Lo: 65°F Lo: 18°C |
Saturday... Mostly sunny. Highs in the lower 80s. Northeast winds around 5 mph in the morning, becoming light and variable. |
Sun Hi: 81°FHi: 27°C Lo: 69°F Lo: 21°C |
Sunday... Showers likely in the morning, then showers with thunderstorms likely in the afternoon. Humid with highs in the lower 80s. Chance of rain 90%. |
Mon Hi: 81°FHi: 27°C Lo: 61°F Lo: 16°C |
Monday... Partly sunny with a chance of showers. A chance of thunderstorms in the afternoon. Humid with highs in the lower 80s. Chance of rain 50%. |
| Tue Hi: 81°FHi: 27°C Lo: 61°F Lo: 16°C |
Tuesday... Sunny. Highs in the lower 80s. |
| Wed Hi: 81°FHi: 27°C Lo: 65°F Lo: 18°C |
Wednesday... Mostly sunny. Humid with highs in the lower 80s. |
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