Northumberland, PA Weather & Growing Conditions
Today
84°F
Sunny
Sunny, with a high near 84. Northeast wind around 1 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Sunny | 1 mph NE | 0% |
| Tonight | 64°F | Mostly Cloudy | 1 mph E | 2% |
| Wednesday | 82°F | Patchy Fog then Slight Chance Showers And Thunderstorms | 0 to 3 mph E | 19% |
| Wednesday Night | 69°F | Chance Showers And Thunderstorms | 0 to 3 mph SE | 54% |
| Thursday | 87°F | Showers And Thunderstorms | 1 to 6 mph S | 80% |
| Thursday Night | 69°F | Showers And Thunderstorms then Chance Showers And Thunderstorms | 0 to 3 mph SW | 80% |
| Friday | 86°F | Showers And Thunderstorms Likely | 0 to 5 mph SW | 72% |
| Friday Night | 68°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 2 mph SW | 72% |
| Saturday | 85°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 0 to 5 mph W | 45% |
| Saturday Night | 67°F | Chance Showers And Thunderstorms | 0 to 3 mph W | 45% |
| Sunday | 87°F | Mostly Sunny | 0 to 5 mph W | 11% |
| Sunday Night | 69°F | Mostly Clear | 3 mph SW | 11% |
| Monday | 88°F | Mostly Sunny then Chance Showers And Thunderstorms | 1 to 7 mph W | 25% |
| Monday Night | 68°F | Chance Showers And Thunderstorms | 2 to 6 mph W | 25% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Northumberland, PA
Last spring frost
Apr 30
First fall frost
Oct 13
Growing season
166 days
Hardiness zone
6b
Explore more for Northumberland, PA: full frost dates · planting calendar · Pennsylvania frost dates
Climate data from the nearest NOAA station, Sunbury, Pa (5.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.