Port Allegany, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Port Allegany, a borough in Mckean County, Pennsylvania.
Today
72°F
Partly Sunny
Partly sunny, with a high near 72. Southeast wind 3 to 13 mph.
7-day forecast for Port Allegany
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 72°F | Partly Sunny | 3 to 13 mph SE | 2% |
| Tonight | 55°F | Light Rain | 13 to 17 mph S | 97% |
| Thursday | 67°F | Light Rain | 8 to 12 mph SW | 81% |
| Thursday Night | 44°F | Mostly Cloudy | 3 to 8 mph SW | 2% |
| Friday | 60°F | Mostly Cloudy then Chance Light Rain | 6 mph SW | 27% |
| Friday Night | 38°F | Chance Light Rain | 2 to 6 mph W | 47% |
| Saturday | 49°F | Light Rain Likely | 6 to 10 mph W | 60% |
| Saturday Night | 33°F | Light Rain Likely | 6 to 10 mph W | 57% |
| Sunday | 50°F | Slight Chance Light Rain | 7 to 10 mph W | 15% |
| Sunday Night | 30°F | Slight Chance Light Rain | 6 to 9 mph W | 17% |
| Monday | 51°F | Chance Light Rain | 10 mph W | 25% |
| Monday Night | 31°F | Slight Chance Light Rain then Partly Cloudy | 7 mph W | 18% |
| Tuesday | 54°F | Mostly Sunny then Slight Chance Light Rain | 8 to 13 mph W | 15% |
| Tuesday Night | 30°F | Slight Chance Light Rain | 3 to 8 mph W | 16% |
Forecast source: National Weather Service (api.weather.gov) for Port Allegany (41.815, -78.276). Updated through the day.
Growing snapshot for Port Allegany
Last spring frost
May 15
First fall frost
Oct 6
Growing season
144 days
Hardiness zone
5b
More local growing data for Port Allegany: nearby ZIP 16743 weather · frost dates · planting calendar · Pennsylvania frost dates
Nearby towns & communities
Bradford
Eldred
Foster Brook
Kane
Lewis Run
Mount Jewett
Rew
Smethport
University of Pittsburgh Bradford
Climate data from the nearest NOAA station, Port Allegany, Pa (4.3 mi from Port Allegany). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.