St. Petersburg, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Petersburg, a borough in Clarion County, Pennsylvania.
This Afternoon
78°F
Slight Chance Light Rain
A slight chance of rain between 2pm and 4pm. Partly sunny. High near 78, with temperatures falling to around 70 in the afternoon. South wind 6 to 9 mph. Chance of precipitation is 20%.
7-day forecast for St. Petersburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 78°F | Slight Chance Light Rain | 6 to 9 mph S | 15% |
| Tonight | 59°F | Light Rain | 8 mph S | 84% |
| Thursday | 68°F | Chance Light Rain then Mostly Sunny | 6 to 10 mph SW | 25% |
| Thursday Night | 45°F | Partly Cloudy | 5 mph SW | 0% |
| Friday | 60°F | Chance Light Rain | 2 to 7 mph SW | 51% |
| Friday Night | 36°F | Chance Light Rain | 5 mph W | 51% |
| Saturday | 52°F | Light Rain Likely | 6 to 10 mph W | 57% |
| Saturday Night | 33°F | Light Rain Likely | 8 mph W | 57% |
| Sunday | 55°F | Mostly Sunny | 6 to 10 mph W | 9% |
| Sunday Night | 32°F | Partly Cloudy | 7 mph W | 10% |
| Monday | 57°F | Mostly Sunny | 7 to 12 mph W | 13% |
| Monday Night | 33°F | Mostly Clear | 7 mph W | 5% |
| Tuesday | 61°F | Sunny | 7 to 10 mph W | 3% |
| Tuesday Night | 32°F | Partly Cloudy | 5 mph W | 2% |
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.