Sunbury, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sunbury, a city in Northumberland County, Pennsylvania.
This Afternoon
79°F
Mostly Sunny
Mostly sunny, with a high near 79. North wind around 6 mph.
7-day forecast for Sunbury
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 79°F | Mostly Sunny | 6 mph N | 0% |
| Tonight | 50°F | Partly Cloudy then Areas Of Fog | 1 to 6 mph N | 0% |
| Saturday | 73°F | Areas Of Fog then Mostly Sunny | 2 mph E | 2% |
| Saturday Night | 60°F | Mostly Cloudy then Rain Showers Likely | 1 to 7 mph SE | 74% |
| Sunday | 72°F | Rain Showers | 3 to 8 mph S | 97% |
| Sunday Night | 57°F | Showers And Thunderstorms | 2 to 7 mph NW | 96% |
| Monday | 68°F | Chance Rain Showers | 7 mph N | 29% |
| Monday Night | 53°F | Chance Rain Showers | 2 to 6 mph NE | 52% |
| Tuesday | 62°F | Rain Showers Likely | 6 mph NE | 55% |
| Tuesday Night | 49°F | Rain Showers Likely | 6 mph NE | 55% |
| Wednesday | 60°F | Chance Rain Showers | 6 mph NE | 46% |
| Wednesday Night | 49°F | Chance Showers And Thunderstorms | 5 mph NE | 46% |
| Thursday | 62°F | Chance Showers And Thunderstorms | 5 mph NE | 38% |
| Thursday Night | 50°F | Chance Showers And Thunderstorms | 0 to 3 mph N | 36% |
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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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 Sep 18, 2026.