St. Petersburg, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Petersburg, a borough in Clarion County, Pennsylvania.
Today
73°F
Partly Sunny then Slight Chance Light Rain
A slight chance of rain after 4pm. Partly sunny, with a high near 73. South wind around 8 mph. Chance of precipitation is 20%.
7-day forecast for St. Petersburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 73°F | Partly Sunny then Slight Chance Light Rain | 8 mph S | 16% |
| Tonight | 59°F | Light Rain | 8 mph S | 93% |
| Thursday | 68°F | Chance Light Rain then Mostly Sunny | 5 to 10 mph SW | 36% |
| Thursday Night | 44°F | Partly Cloudy | 1 to 5 mph SW | 1% |
| Friday | 62°F | Partly Sunny then Slight Chance Light Rain | 1 to 6 mph SW | 20% |
| Friday Night | 39°F | Chance Light Rain | 2 to 6 mph W | 49% |
| Saturday | 53°F | Chance Light Rain | 6 to 9 mph W | 49% |
| Saturday Night | 33°F | Chance Light Rain | 7 mph W | 38% |
| Sunday | 54°F | Slight Chance Light Rain then Partly Sunny | 6 to 10 mph W | 15% |
| Sunday Night | 30°F | Partly Cloudy | 7 mph W | 9% |
| Monday | 55°F | Slight Chance Light Rain | 6 to 9 mph W | 22% |
| Monday Night | 31°F | Slight Chance Light Rain then Partly Cloudy | 3 to 7 mph SW | 18% |
| Tuesday | 58°F | Mostly Sunny | 7 to 12 mph SW | 7% |
| Tuesday Night | 31°F | Partly Cloudy | 2 to 6 mph W | 7% |
Forecast source: National Weather Service (api.weather.gov) for St. Petersburg (41.161, -79.655). Updated through the day.
Growing snapshot for St. Petersburg
Last spring frost
May 9
First fall frost
Oct 11
Growing season
154 days
Hardiness zone
6a
More local growing data for St. Petersburg: nearby ZIP 16054 weather · frost dates · planting calendar · Pennsylvania frost dates
Nearby towns & communities
Callensburg
Clarion
Crown
Foxburg
Hawthorn
Knox
Leeper
Marianne
Parker
Rimersburg
Shippenville
Sligo
Strattanville
Tylersburg
Vowinckel
Climate data from the nearest NOAA station, Clarion 3 Sw, Pa (12 mi from St. Petersburg). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.