Belfast, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Belfast, a community in Northampton County, Pennsylvania.
This Afternoon
72°F
Partly Sunny
Partly sunny, with a high near 72. Southeast wind around 0 mph.
7-day forecast for Belfast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 72°F | Partly Sunny | 0 mph | 1% |
| Tonight | 57°F | Mostly Cloudy then Rain Showers Likely | 5 mph E | 69% |
| Sunday | 72°F | Rain Showers | 5 mph SE | 97% |
| Sunday Night | 56°F | Showers And Thunderstorms then Mostly Cloudy | 5 to 10 mph W | 83% |
| Monday | 69°F | Partly Sunny then Slight Chance Rain Showers | 5 to 10 mph NE | 22% |
| Monday Night | 50°F | Chance Rain Showers | 5 to 10 mph NE | 32% |
| Tuesday | 63°F | Chance Rain Showers | 10 mph NE | 38% |
| Tuesday Night | 48°F | Chance Rain Showers then Mostly Cloudy | 10 to 15 mph NE | 33% |
| Wednesday | 62°F | Slight Chance Rain Showers | 15 mph NE | 20% |
| Wednesday Night | 48°F | Slight Chance Rain Showers | 10 to 15 mph NE | 21% |
| Thursday | 61°F | Slight Chance Rain Showers | 10 to 15 mph NE | 24% |
| Thursday Night | 48°F | Chance Rain Showers | 10 to 15 mph NE | 28% |
| Friday | 65°F | Chance Rain Showers | 10 to 15 mph N | 31% |
| Friday Night | 49°F | Chance Rain Showers | 10 to 15 mph N | 31% |
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 Sep 20, 2026.