Mercer, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mercer, a borough in Mercer County, Pennsylvania.
Today
74°F
Mostly Cloudy
Mostly cloudy, with a high near 74. East wind around 7 mph.
7-day forecast for Mercer
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 74°F | Mostly Cloudy | 7 mph E | 5% |
| Tonight | 61°F | Slight Chance Showers And Thunderstorms then Showers And Thunderstorms | 6 mph SE | 77% |
| Sunday | 73°F | Showers And Thunderstorms | 6 to 10 mph SW | 89% |
| Sunday Night | 50°F | Rain Showers Likely then Mostly Cloudy | 8 to 12 mph NE | 56% |
| Monday | 67°F | Mostly Cloudy | 12 mph NE | 14% |
| Monday Night | 49°F | Chance Rain Showers | 9 to 13 mph NE | 48% |
| Tuesday | 62°F | Chance Rain Showers | 15 mph E | 49% |
| Tuesday Night | 48°F | Rain Showers Likely | 17 mph E | 57% |
| Wednesday | 61°F | Rain Showers Likely | 17 mph E | 57% |
| Wednesday Night | 48°F | Showers And Thunderstorms Likely | 13 to 16 mph E | 62% |
| Thursday | 65°F | Showers And Thunderstorms Likely | 9 to 13 mph E | 62% |
| Thursday Night | 48°F | Slight Chance Rain Showers | 5 to 9 mph E | 19% |
| Friday | 68°F | Slight Chance Rain Showers | 9 mph NE | 17% |
| Friday Night | 48°F | Partly Cloudy | 5 to 8 mph NE | 12% |
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
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Fredonia
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Grove City
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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 Sep 19, 2026.