Jefferson, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Jefferson, a borough in Greene County, Pennsylvania.
Today
86°F
Sunny
Sunny, with a high near 86. East wind 0 to 5 mph.
7-day forecast for Jefferson
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Sunny | 0 to 5 mph E | 0% |
| Tonight | 67°F | Partly Cloudy | 1 to 5 mph SE | 2% |
| Wednesday | 86°F | Mostly Sunny then Isolated Showers And Thunderstorms | 1 to 5 mph S | 21% |
| Wednesday Night | 68°F | Scattered Showers And Thunderstorms | 1 to 5 mph S | 48% |
| Thursday | 85°F | Showers And Thunderstorms | 2 to 7 mph SW | 77% |
| Thursday Night | 68°F | Showers And Thunderstorms then Chance Showers And Thunderstorms | 2 to 6 mph SW | 77% |
| Friday | 84°F | Showers And Thunderstorms | 3 to 8 mph SW | 82% |
| Friday Night | 66°F | Showers And Thunderstorms | 6 mph SW | 82% |
| Saturday | 83°F | Showers And Thunderstorms Likely | 5 to 8 mph SW | 62% |
| Saturday Night | 67°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 6 mph SW | 62% |
| Sunday | 85°F | Slight Chance Showers And Thunderstorms | 3 to 8 mph SW | 24% |
| Sunday Night | 69°F | Slight Chance Showers And Thunderstorms | 7 mph SW | 24% |
| Monday | 86°F | Chance Showers And Thunderstorms | 7 to 10 mph SW | 31% |
| Monday Night | 68°F | Chance Showers And Thunderstorms | 5 to 8 mph SW | 48% |
Forecast source: National Weather Service (api.weather.gov) for Jefferson (39.930, -80.058). Updated through the day.
Growing snapshot for Jefferson
Last spring frost
May 3
First fall frost
Oct 15
Growing season
164 days
Hardiness zone
6b
More local growing data for Jefferson: nearby ZIP 15344 weather · frost dates · planting calendar · Pennsylvania frost dates
Nearby towns & communities
Bobtown
Carmichaels
Clarksville
Crucible
Dry Tavern
Fairdale
Mapletown
Mather
Morrisville
Mount Morris
Nemacolin
New Freeport
Rices Landing
Rogersville
Waynesburg
West Waynesburg
Wind Ridge
Climate data from the nearest NOAA station, Waynesburg 1 E, Pa (6.3 mi from Jefferson). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.