Jefferson, PA Weather & Growing Conditions
This Afternoon
76°F
Mostly Sunny
Mostly sunny. High near 76, with temperatures falling to around 70 in the afternoon. South wind around 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 76°F | Mostly Sunny | 6 mph S | 0% |
| Tonight | 62°F | Mostly Cloudy then Light Rain Likely | 7 to 14 mph S | 69% |
| Thursday | 73°F | Rain Showers | 7 to 14 mph S | 82% |
| Thursday Night | 56°F | Rain Showers Likely | 1 to 6 mph W | 60% |
| Friday | 68°F | Slight Chance Rain Showers | 1 to 5 mph NW | 21% |
| Friday Night | 46°F | Slight Chance Rain Showers then Partly Cloudy | 1 to 7 mph W | 16% |
| Saturday | 58°F | Mostly Sunny | 8 to 14 mph NW | 13% |
| Saturday Night | 41°F | Partly Cloudy | 9 to 13 mph NW | 13% |
| Sunday | 59°F | Mostly Sunny | 9 to 14 mph NW | 4% |
| Sunday Night | 38°F | Mostly Clear | 7 to 10 mph W | 0% |
| Monday | 60°F | Sunny | 9 to 14 mph W | 0% |
| Monday Night | 37°F | Mostly Clear | 7 mph W | 0% |
| Tuesday | 65°F | Sunny | 6 to 12 mph W | 1% |
| Tuesday Night | 39°F | Mostly Clear | 3 to 7 mph W | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Jefferson, PA
Last spring frost
Apr 19
First fall frost
Oct 25
Growing season
188 days
Hardiness zone
7a
Explore more for Jefferson, PA: full frost dates · planting calendar · Pennsylvania frost dates
Climate data from the nearest NOAA station, Millers 4 Ne, Md (7.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 5, 2026.