Marianna, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Marianna, a borough in Washington County, Pennsylvania.
Today
84°F
Patchy Fog then Sunny
Patchy fog before 9am. Sunny, with a high near 84. East wind 1 to 5 mph.
7-day forecast for Marianna
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Patchy Fog then Sunny | 1 to 5 mph E | 0% |
| Tonight | 67°F | Partly Cloudy | 5 mph SE | 2% |
| Wednesday | 85°F | Mostly Sunny then Isolated Showers And Thunderstorms | 1 to 5 mph S | 22% |
| Wednesday Night | 68°F | Scattered Showers And Thunderstorms | 5 mph S | 49% |
| Thursday | 84°F | Showers And Thunderstorms | 3 to 7 mph SW | 76% |
| Thursday Night | 68°F | Showers And Thunderstorms then Chance Showers And Thunderstorms | 2 to 6 mph SW | 76% |
| Friday | 83°F | Showers And Thunderstorms | 5 to 8 mph SW | 83% |
| Friday Night | 66°F | Showers And Thunderstorms | 2 to 6 mph SW | 83% |
| Saturday | 82°F | Showers And Thunderstorms Likely | 5 to 8 mph SW | 60% |
| Saturday Night | 66°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 2 to 6 mph SW | 60% |
| Sunday | 84°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 | 85°F | Chance Showers And Thunderstorms | 7 to 10 mph SW | 32% |
| Monday Night | 68°F | Chance Showers And Thunderstorms | 5 to 8 mph SW | 48% |
Forecast source: National Weather Service (api.weather.gov) for Marianna (40.013, -80.112). Updated through the day.
Growing snapshot for Marianna
Last spring frost
May 3
First fall frost
Oct 15
Growing season
164 days
Hardiness zone
6b
More local growing data for Marianna: nearby ZIP 15345 weather · frost dates · planting calendar · Pennsylvania frost dates
Nearby towns & communities
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Arnold City
Atlasburg
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Beallsville
Belle Vernon
Bentleyville
Bulger
Burgettstown
California
Canonsburg
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Claysville
Cokeburg
Cross Creek
Deemston
Donora
Dunlevy
East Marianna
East Washington
Eighty Four
Ellsworth
Elrama
Fairhope
Fayette City
Finleyville
Fredericktown
Green Hills
Climate data from the nearest NOAA station, Waynesburg 1 E, Pa (9 mi from Marianna). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.