17857 Weather (Northumberland, PA)

Weather forecast for: Northumberland PA

Last Update: 8:11 pm EDT Aug 5, 2026

Tonight: A chance of showers and thunderstorms before 2am, then a slight chance of showers between 2am and 3am. Patchy fog after midnight. Otherwise, mostly cloudy, with a low around 68. Calm wind. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Thursday: A chance of showers and thunderstorms between 2pm and 3pm, then showers likely and possibly a thunderstorm after 3pm. Patchy fog before 9am. Otherwise, partly sunny, with a high near 86. Calm wind becoming southwest around 5 mph in the afternoon. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Thursday Night: A chance of showers and thunderstorms before 11pm, then a chance of showers between 11pm and 2am. Mostly cloudy, with a low around 68. Calm wind. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Friday: A chance of showers before 11am, then a chance of showers and thunderstorms between 11am and 2pm, then showers and possibly a thunderstorm after 2pm. High near 85. Light southwest wind. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Friday Night: Showers and thunderstorms before 11pm, then a chance of showers between 11pm and 2am. Low around 67. Calm wind. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Saturday: A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 84. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Saturday Night: A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 2am. Partly cloudy, with a low around 67. Chance of precipitation is 30%.

Sunday: Sunny, with a high near 85.

Sunday Night: Mostly clear, with a low around 65.

Monday: Mostly sunny, with a high near 86.

Monday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 68. Chance of precipitation is 50%.

Tuesday: A chance of showers and thunderstorms. Partly sunny, with a high near 84. Chance of precipitation is 50%.

Tuesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Chance of precipitation is 40%.

Wednesday: A chance of showers. Partly sunny, with a high near 80. Chance of precipitation is 30%.