Monongahela, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Monongahela, a city in Washington County, Pennsylvania.
This Afternoon
78°F
Sunny
Sunny, with a high near 78. South wind around 2 mph.
7-day forecast for Monongahela
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 78°F | Sunny | 2 mph S | 1% |
| Tonight | 52°F | Mostly Clear | 5 mph SE | 2% |
| Wednesday | 78°F | Partly Sunny | 2 to 10 mph S | 8% |
| Wednesday Night | 61°F | Light Rain | 9 mph S | 98% |
| Thursday | 72°F | Chance Light Rain | 7 to 13 mph SW | 37% |
| Thursday Night | 48°F | Mostly Cloudy | 1 to 6 mph SW | 8% |
| Friday | 66°F | Partly Sunny | 1 to 7 mph W | 12% |
| Friday Night | 44°F | Chance Light Rain | 5 mph NW | 27% |
| Saturday | 56°F | Chance Light Rain | 5 to 12 mph W | 29% |
| Saturday Night | 36°F | Chance Light Rain then Mostly Cloudy | 2 to 8 mph W | 27% |
| Sunday | 57°F | Partly Sunny then Slight Chance Light Rain | 3 to 12 mph SW | 16% |
| Sunday Night | 34°F | Slight Chance Light Rain | 9 mph SW | 23% |
| Monday | 57°F | Chance Light Rain | 9 to 15 mph W | 31% |
| Monday Night | 35°F | Chance Light Rain then Partly Cloudy | 8 to 12 mph SW | 31% |
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 Nov 3, 2026.