Monongahela, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Monongahela, a city in Washington County, Pennsylvania.
Tonight
58°F
Partly Cloudy
Partly cloudy, with a low around 58. Northeast wind 2 to 6 mph.
7-day forecast for Monongahela
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 58°F | Partly Cloudy | 2 to 6 mph NE | 11% |
| Saturday | 80°F | Mostly Sunny | 5 mph E | 3% |
| Saturday Night | 65°F | Mostly Cloudy then Showers And Thunderstorms Likely | 7 mph SE | 56% |
| Sunday | 79°F | Showers And Thunderstorms | 9 mph SW | 94% |
| Sunday Night | 60°F | Showers And Thunderstorms | 6 to 9 mph N | 94% |
| Monday | 71°F | Chance Rain Showers | 12 mph NE | 44% |
| Monday Night | 59°F | Showers And Thunderstorms Likely | 12 mph E | 68% |
| Tuesday | 68°F | Showers And Thunderstorms | 10 to 14 mph E | 76% |
| Tuesday Night | 55°F | Showers And Thunderstorms Likely | 12 to 15 mph E | 70% |
| Wednesday | 66°F | Showers And Thunderstorms Likely | 14 mph E | 66% |
| Wednesday Night | 53°F | Chance Showers And Thunderstorms | 7 to 14 mph E | 52% |
| Thursday | 66°F | Chance Rain Showers | 9 mph E | 41% |
| Thursday Night | 52°F | Slight Chance Rain Showers | 3 to 9 mph NE | 24% |
| Friday | 70°F | Slight Chance Rain Showers | 5 to 9 mph N | 16% |
Forecast source: National Weather Service (api.weather.gov) for Monongahela (40.191, -79.922). Updated through the day.
Growing snapshot for Monongahela
Last spring frost
Apr 13
First fall frost
Nov 5
Growing season
205 days
Hardiness zone
6b
More local growing data for Monongahela: nearby ZIP 15063 weather · frost dates · planting calendar · Pennsylvania frost dates
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Climate data from the nearest NOAA station, Charleroi Lock 4, Pa (3.3 mi from Monongahela). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.