Mercer, PA Weather & Growing Conditions
Overnight
52°F
Mostly Clear
Mostly clear, with a low around 52. Southeast wind around 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 52°F | Mostly Clear | 7 mph SE | 1% |
| Wednesday | 74°F | Mostly Cloudy then Chance Light Rain | 7 to 13 mph S | 47% |
| Wednesday Night | 57°F | Light Rain | 9 to 14 mph S | 98% |
| Thursday | 66°F | Mostly 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% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Mercer, PA
Last spring frost
May 15
First fall frost
Oct 3
Growing season
140 days
Hardiness zone
6a
Explore more for Mercer, PA: full frost dates · planting calendar · Pennsylvania frost dates
Climate data from the nearest NOAA station, Mercer, Pa (0.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.