Northumberland, PA Weather & Growing Conditions
This Afternoon
72°F
Slight Chance Rain Showers
A slight chance of rain showers. Partly sunny, with a high near 72. South wind around 2 mph. Chance of precipitation is 20%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 72°F | Slight Chance Rain Showers | 2 mph S | 15% |
| Tonight | 61°F | Rain Showers | 1 to 10 mph SE | 85% |
| Sunday | 74°F | Rain Showers | 3 to 10 mph S | 95% |
| Sunday Night | 54°F | Showers And Thunderstorms Likely then Mostly Cloudy | 3 to 9 mph NW | 69% |
| Monday | 69°F | Partly Sunny then Slight Chance Rain Showers | 5 to 8 mph N | 16% |
| Monday Night | 52°F | Chance Rain Showers | 5 mph NE | 52% |
| Tuesday | 63°F | Chance Rain Showers | 5 mph NE | 52% |
| Tuesday Night | 49°F | Chance Rain Showers | 7 mph E | 38% |
| Wednesday | 62°F | Slight Chance Rain Showers | 7 mph E | 21% |
| Wednesday Night | 48°F | Mostly Cloudy then Slight Chance Rain Showers | 6 mph E | 22% |
| Thursday | 63°F | Slight Chance Rain Showers | 6 mph NE | 22% |
| Thursday Night | 48°F | Slight Chance Rain Showers | 5 mph NE | 19% |
| Friday | 66°F | Slight Chance Rain Showers | 7 mph N | 24% |
| Friday Night | 49°F | Slight Chance Rain Showers | 7 mph N | 24% |
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 Sep 20, 2026.