Jefferson, PA Weather & Growing Conditions
Today
84°F
Mostly Sunny
Mostly sunny, with a high near 84. East wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Mostly Sunny | 5 mph E | 0% |
| Tonight | 66°F | Mostly Cloudy then Patchy Fog | 5 mph SE | 17% |
| Wednesday | 82°F | Patchy Fog then Showers And Thunderstorms | 2 to 6 mph SE | 76% |
| Wednesday Night | 69°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 6 mph S | 74% |
| Thursday | 87°F | Mostly Sunny then Chance Showers And Thunderstorms | 5 to 8 mph S | 51% |
| Thursday Night | 70°F | Chance Showers And Thunderstorms | 2 to 7 mph SW | 51% |
| Friday | 87°F | Mostly Sunny then Chance Showers And Thunderstorms | 2 to 6 mph SW | 51% |
| Friday Night | 68°F | Chance Showers And Thunderstorms | 1 to 5 mph SW | 51% |
| Saturday | 86°F | Partly Sunny then Chance Showers And Thunderstorms | 2 to 6 mph SW | 46% |
| Saturday Night | 68°F | Chance Showers And Thunderstorms | 1 to 5 mph SW | 46% |
| Sunday | 87°F | Mostly Sunny | 2 to 6 mph W | 14% |
| Sunday Night | 70°F | Partly Cloudy | 3 mph SW | 14% |
| Monday | 89°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 3 to 8 mph W | 21% |
| Monday Night | 69°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 3 to 7 mph W | 21% |
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 (3.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.