Marianna, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Marianna, a borough in Washington County, Pennsylvania.
Today
75°F
Partly Sunny then Slight Chance Light Rain
A slight chance of rain after 1pm. Partly sunny, with a high near 75. South wind 1 to 9 mph. Chance of precipitation is 20%.
7-day forecast for Marianna
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 75°F | Partly Sunny then Slight Chance Light Rain | 1 to 9 mph S | 22% |
| Tonight | 60°F | Light Rain | 10 mph S | 99% |
| Thursday | 69°F | Chance Light Rain then Partly Sunny | 7 to 12 mph SW | 38% |
| Thursday Night | 47°F | Partly Cloudy | 2 to 6 mph SW | 2% |
| Friday | 63°F | Partly Sunny then Slight Chance Light Rain | 2 to 8 mph SW | 17% |
| Friday Night | 40°F | Chance Light Rain | 3 to 7 mph W | 31% |
| Saturday | 52°F | Chance Light Rain | 8 to 12 mph W | 31% |
| Saturday Night | 35°F | Slight Chance Light Rain | 5 to 9 mph W | 22% |
| Sunday | 55°F | Partly Sunny | 5 to 13 mph W | 7% |
| Sunday Night | 32°F | Partly Cloudy | 6 to 9 mph SW | 5% |
| Monday | 56°F | Mostly Sunny | 7 to 12 mph W | 8% |
| Monday Night | 33°F | Mostly Clear | 6 to 9 mph SW | 7% |
| Tuesday | 60°F | Sunny | 9 to 14 mph SW | 3% |
| Tuesday Night | 33°F | Partly Cloudy | 3 to 8 mph W | 2% |
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
Cecil-Bishop
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 Nov 4, 2026.