Belfast, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Belfast, a community in Northampton County, Pennsylvania.
Today
83°F
Sunny
Sunny, with a high near 83. Northeast wind around 0 mph.
7-day forecast for Belfast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Sunny | 0 mph | 0% |
| Tonight | 62°F | Mostly Cloudy | 0 mph | 1% |
| Wednesday | 82°F | Partly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph E | 51% |
| Wednesday Night | 68°F | Showers And Thunderstorms Likely | 0 to 5 mph SE | 59% |
| Thursday | 87°F | Showers And Thunderstorms | 0 to 5 mph SW | 78% |
| Thursday Night | 70°F | Showers And Thunderstorms | 0 to 5 mph SW | 78% |
| Friday | 87°F | Mostly Sunny then Showers And Thunderstorms Likely | 0 to 5 mph SW | 64% |
| Friday Night | 68°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 0 to 5 mph W | 64% |
| Saturday | 85°F | Partly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph SW | 49% |
| Saturday Night | 67°F | Chance Showers And Thunderstorms | 0 to 5 mph W | 49% |
| Sunday | 86°F | Mostly Sunny | 0 to 5 mph W | 12% |
| Sunday Night | 68°F | Mostly Clear | 0 to 5 mph SW | 12% |
| Monday | 87°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 0 to 10 mph W | 18% |
| Monday Night | 67°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 0 to 10 mph W | 18% |
Forecast source: National Weather Service (api.weather.gov) for Belfast (40.782, -75.274). Updated through the day.
Growing snapshot for Belfast
Last spring frost
Apr 18
First fall frost
Oct 25
Growing season
188 days
Hardiness zone
7a
More local growing data for Belfast: nearby ZIP 18083 weather · frost dates · planting calendar · Pennsylvania frost dates
Nearby towns & communities
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Bath
Chapman
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Freemansburg
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Hellertown
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Middletown
Morgan Hill
Mount Bethel
Nazareth
Northampton
Old Orchard
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Pen Argyl
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Wind Gap
Climate data from the nearest NOAA station, Phillipsburg-Easton Brg, Nj (5.3 mi from Belfast). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.