Jefferson, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Jefferson, a borough in Greene County, Pennsylvania.
This Afternoon
76°F
Partly Sunny
Partly sunny, with a high near 76. North wind around 7 mph.
7-day forecast for Jefferson
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 76°F | Partly Sunny | 7 mph N | 14% |
| Tonight | 58°F | Partly Cloudy | 2 to 7 mph N | 13% |
| Saturday | 80°F | Mostly Sunny | 3 mph E | 6% |
| Saturday Night | 65°F | Partly Cloudy then Chance Showers And Thunderstorms | 2 to 6 mph SE | 53% |
| Sunday | 79°F | Showers And Thunderstorms | 6 to 9 mph SW | 93% |
| Sunday Night | 61°F | Showers And Thunderstorms | 5 to 9 mph NW | 93% |
| Monday | 71°F | Chance Rain Showers | 9 mph NE | 47% |
| Monday Night | 60°F | Showers And Thunderstorms Likely | 9 mph NE | 70% |
| Tuesday | 68°F | Showers And Thunderstorms | 12 mph E | 75% |
| Tuesday Night | 55°F | Showers And Thunderstorms Likely | 10 to 14 mph E | 72% |
| Wednesday | 65°F | Showers And Thunderstorms Likely | 12 mph E | 67% |
| Wednesday Night | 54°F | Showers And Thunderstorms Likely | 5 to 12 mph E | 55% |
| Thursday | 66°F | Chance Rain Showers | 8 mph E | 42% |
| Thursday Night | 53°F | Chance Rain Showers | 2 to 8 mph NE | 34% |
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
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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 Sep 18, 2026.