Mercer, PA Weather & Growing Conditions
This Afternoon
75°F
Mostly Sunny
Mostly sunny, with a high near 75. North wind around 9 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 75°F | Mostly Sunny | 9 mph N | 7% |
| Tonight | 55°F | Partly Cloudy | 5 to 9 mph NE | 7% |
| Saturday | 75°F | Partly Sunny then Slight Chance Rain Showers | 7 mph E | 20% |
| Saturday Night | 62°F | Mostly Cloudy then Showers And Thunderstorms | 6 mph SE | 79% |
| Sunday | 74°F | Showers And Thunderstorms | 6 to 9 mph W | 88% |
| Sunday Night | 54°F | Rain Showers Likely | 9 mph NE | 60% |
| Monday | 68°F | Slight Chance Rain Showers | 12 mph NE | 18% |
| Monday Night | 53°F | Chance Rain Showers | 13 mph E | 50% |
| Tuesday | 65°F | Chance Rain Showers | 15 mph E | 50% |
| Tuesday Night | 51°F | Showers And Thunderstorms Likely | 17 mph E | 60% |
| Wednesday | 62°F | Rain Showers Likely | 16 mph E | 60% |
| Wednesday Night | 51°F | Showers And Thunderstorms Likely | 12 to 15 mph E | 56% |
| Thursday | 64°F | Chance Rain Showers | 9 to 13 mph E | 45% |
| Thursday Night | 50°F | Slight Chance Rain Showers | 5 to 8 mph NE | 18% |
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 Sep 19, 2026.