Sunbury, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sunbury, a city in Northumberland County, Pennsylvania.
Today
84°F
Patchy Fog then Sunny
Patchy fog before 10am. Sunny, with a high near 84. Northeast wind around 1 mph.
7-day forecast for Sunbury
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Patchy Fog then Sunny | 1 mph NE | 0% |
| Tonight | 64°F | Mostly Cloudy then Patchy Fog | 0 mph | 3% |
| Wednesday | 83°F | Patchy Fog then Slight Chance Showers And Thunderstorms | 0 to 3 mph E | 21% |
| Wednesday Night | 69°F | Slight Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 2 mph SE | 55% |
| Thursday | 87°F | Patchy Fog then Showers And Thunderstorms | 0 to 5 mph S | 79% |
| Thursday Night | 69°F | Showers And Thunderstorms then Chance Showers And Thunderstorms | 2 mph SW | 79% |
| Friday | 87°F | Showers And Thunderstorms Likely | 0 to 3 mph SW | 73% |
| Friday Night | 68°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 2 mph SW | 73% |
| Saturday | 85°F | Partly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph W | 47% |
| Saturday Night | 67°F | Chance Showers And Thunderstorms | 2 mph W | 47% |
| Sunday | 87°F | Mostly Sunny | 0 to 3 mph W | 11% |
| Sunday Night | 69°F | Mostly Clear | 2 mph W | 11% |
| Monday | 88°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 0 to 6 mph W | 23% |
| Monday Night | 68°F | Slight Chance Showers And Thunderstorms | 0 to 5 mph W | 23% |
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
Allenwood
Atlas
Dalmatia
Dewart
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Kulpmont
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Linntown
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Marion Heights
Marshallton
McEwensville
Montandon
Mount Carmel
Northumberland
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Riverside
Shamokin
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Tharptown (Uniontown)
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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 Aug 4, 2026.