Portland, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Portland, a borough in Northampton County, Pennsylvania.
Tonight
56°F
Mostly Cloudy then Chance Rain Showers
A chance of rain showers after 1am. Mostly cloudy, with a low around 56. East wind around 0 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Portland
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 56°F | Mostly Cloudy then Chance Rain Showers | 0 mph | 51% |
| Sunday | 71°F | Rain Showers | 0 to 5 mph SE | 97% |
| Sunday Night | 55°F | Showers And Thunderstorms then Mostly Cloudy | 0 to 5 mph NE | 77% |
| Monday | 71°F | Partly Sunny then Slight Chance Rain Showers | 5 mph NE | 20% |
| Monday Night | 49°F | Chance Rain Showers | 5 mph NE | 31% |
| Tuesday | 64°F | Chance Rain Showers | 5 mph NE | 33% |
| Tuesday Night | 47°F | Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NE | 32% |
| Wednesday | 64°F | Slight Chance Rain Showers | 10 mph NE | 18% |
| Wednesday Night | 47°F | Slight Chance Rain Showers | 5 to 10 mph NE | 21% |
| Thursday | 63°F | Slight Chance Rain Showers | 5 to 10 mph NE | 23% |
| Thursday Night | 47°F | Chance Rain Showers | 5 to 10 mph NE | 28% |
| Friday | 66°F | Chance Rain Showers | 10 mph N | 31% |
| Friday Night | 49°F | Chance Rain Showers | 5 to 10 mph N | 31% |
| Saturday | 70°F | Chance Rain Showers | 5 to 10 mph N | 26% |
Forecast source: National Weather Service (api.weather.gov) for Portland (40.922, -75.098). Updated through the day.
Growing snapshot for Portland
Last spring frost
Apr 30
First fall frost
Oct 18
Growing season
168 days
Hardiness zone
6b
More local growing data for Portland: nearby ZIP 18351 weather · frost dates · planting calendar · Pennsylvania frost dates
Nearby towns & communities
Ackermanville
Bangor
Bath
Belfast
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
Raubsville
Roseto
Stockertown
Tatamy
Walnutport
West Easton
Wilson
Wind Gap
Climate data from the nearest NOAA station, Belvidere Brg, Nj (6.5 mi from Portland). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.