Sunbury, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sunbury, a city in Northumberland County, Pennsylvania.
This Afternoon
69°F
Partly Sunny
Partly sunny, with a high near 69. South wind around 2 mph.
7-day forecast for Sunbury
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 69°F | Partly Sunny | 2 mph S | 2% |
| Tonight | 49°F | Partly Cloudy then Areas Of Fog | 1 mph S | 2% |
| Wednesday | 73°F | Areas Of Fog then Mostly Sunny | 0 to 8 mph S | 2% |
| Wednesday Night | 60°F | Mostly Cloudy then Rain Showers | 7 mph S | 77% |
| Thursday | 72°F | Rain Showers | 3 to 7 mph S | 88% |
| Thursday Night | 54°F | Chance Rain Showers | 2 mph SW | 37% |
| Friday | 68°F | Chance Rain Showers | 1 mph NW | 42% |
| Friday Night | 45°F | Chance Rain Showers | 0 mph | 42% |
| Saturday | 62°F | Slight Chance Rain Showers | 0 to 7 mph NW | 19% |
| Saturday Night | 38°F | Slight Chance Rain Showers then Partly Cloudy | 1 to 5 mph NW | 19% |
| Sunday | 60°F | Mostly Sunny | 1 to 6 mph W | 9% |
| Sunday Night | 35°F | Partly Cloudy then Slight Chance Rain Showers | 3 mph W | 17% |
| Monday | 60°F | Chance Rain Showers | 3 to 9 mph NW | 25% |
| Monday Night | 34°F | Slight Chance Rain Showers | 5 mph SW | 22% |
Forecast source: National Weather Service (api.weather.gov) for Sunbury (40.861, -76.787). Updated through the day.
Growing snapshot for Sunbury
Last spring frost
Apr 30
First fall frost
Oct 13
Growing season
166 days
Hardiness zone
6b
More local growing data for Sunbury: nearby ZIP 17801 weather · frost dates · planting calendar · Pennsylvania frost dates
Nearby towns & communities
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Linntown
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Marshallton
McEwensville
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Mount Carmel
Northumberland
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Climate data from the nearest NOAA station, Sunbury, Pa (1.9 mi from Sunbury). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.