Mercer, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mercer, a borough in Mercer County, Pennsylvania.
Today
72°F
Partly Sunny then Chance Light Rain
A chance of rain after 1pm. Partly sunny, with a high near 72. South wind 6 to 12 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Mercer
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 72°F | Partly Sunny then Chance Light Rain | 6 to 12 mph S | 47% |
| Tonight | 57°F | Light Rain | 9 to 14 mph S | 98% |
| Thursday | 66°F | Partly Sunny | 7 to 14 mph SW | 7% |
| Thursday Night | 44°F | Partly Cloudy | 2 to 7 mph SW | 1% |
| Friday | 60°F | Chance Light Rain | 2 to 8 mph SW | 40% |
| Friday Night | 38°F | Chance Light Rain | 3 to 7 mph W | 54% |
| Saturday | 51°F | Chance Light Rain | 8 to 13 mph W | 52% |
| Saturday Night | 32°F | Chance Light Rain | 5 to 9 mph W | 37% |
| Sunday | 52°F | Slight Chance Light Rain | 6 to 13 mph W | 15% |
| Sunday Night | 30°F | Partly Cloudy | 5 to 8 mph W | 10% |
| Monday | 54°F | Slight Chance Light Rain | 6 to 12 mph W | 21% |
| Monday Night | 31°F | Slight Chance Light Rain then Partly Cloudy | 7 mph SW | 16% |
| Tuesday | 59°F | Mostly Sunny | 7 to 13 mph SW | 7% |
| Tuesday Night | 31°F | Partly Cloudy | 2 to 7 mph W | 7% |
Forecast source: National Weather Service (api.weather.gov) for Mercer (41.227, -80.236). Updated through the day.
Growing snapshot for Mercer
Last spring frost
May 15
First fall frost
Oct 3
Growing season
140 days
Hardiness zone
6a
More local growing data for Mercer: nearby ZIP 16137 weather · frost dates · planting calendar · Pennsylvania frost dates
Nearby towns & communities
Clark
Farrell
Fredonia
Greenville
Grove City
Hermitage
Jackson Center
Lake Latonka
New Lebanon
Reynolds Heights
Sandy Lake
Sharon
Sharpsville
Sheakleyville
Stoneboro
West Middlesex
Wheatland
Climate data from the nearest NOAA station, Mercer, Pa (0.5 mi from Mercer). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.