Belfast, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Belfast, a community in Northampton County, Pennsylvania.
Tonight
46°F
Mostly Clear then Patchy Fog
Patchy fog after 2am. Mostly clear, with a low around 46. Southwest wind 0 to 5 mph.
7-day forecast for Belfast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 46°F | Mostly Clear then Patchy Fog | 0 to 5 mph SW | 3% |
| Wednesday | 72°F | Patchy Fog then Mostly Sunny | 0 to 10 mph SW | 3% |
| Wednesday Night | 56°F | Mostly Cloudy | 0 to 5 mph S | 13% |
| Thursday | 70°F | Light Rain Likely | 5 to 10 mph S | 74% |
| Thursday Night | 58°F | Light Rain Likely | 0 to 5 mph SW | 64% |
| Friday | 68°F | Light Rain Likely | 0 to 5 mph W | 64% |
| Friday Night | 49°F | Light Rain Likely | 0 to 5 mph N | 59% |
| Saturday | 64°F | Slight Chance Light Rain | 5 to 10 mph NW | 20% |
| Saturday Night | 39°F | Slight Chance Light Rain | 5 mph NW | 18% |
| Sunday | 60°F | Mostly Sunny | 5 to 10 mph W | 14% |
| Sunday Night | 37°F | Slight Chance Light Rain | 5 mph W | 18% |
| Monday | 59°F | Chance Light Rain | 5 to 15 mph NW | 25% |
| Monday Night | 35°F | Slight Chance Light Rain | 5 to 10 mph W | 23% |
| Tuesday | 61°F | Slight Chance Light Rain then Mostly Sunny | 5 to 15 mph W | 16% |
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
Ackermanville
Bangor
Bath
Chapman
Cherryville
Chestnut Hill
East Bangor
Eastlawn Gardens
Easton
Freemansburg
Glendon
Hellertown
Martins Creek
Middletown
Morgan Hill
Mount Bethel
Nazareth
Northampton
Old Orchard
Palmer Heights
Pen Argyl
Portland
Raubsville
Roseto
Stockertown
Tatamy
Walnutport
West Easton
Wilson
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 Nov 4, 2026.