Greenville Weather Forecast
- 65
- 80
Rain Showers
- 54
- 82
Rain Showers Likely
- 50
- 69
Mostly Sunny
- 62
- 79
Chance Rain Showers
- 65
- 83
Chance Rain Showers
- 62
- 84
Rain Showers Likely
- 56
- 78
Chance Rain Showers
Today 12 Sep Mercer
Showers with a chance of Thunderstorms. Some Thunderstorms may produce heavy rainfall. Near steady temperature in the mid 70s. Southwest Winds 5 to 10 Mph. Chance of rain 90 percent.
Tonight 12 Sep Mercer
Considerable cloudiness. Showers with a chance of Thunderstorms this Evening, then a chance of Showers with a slight chance of Thunderstorms after midnight. Patchy fog. Some Thunderstorms may produce heavy rainfall this evening. Some Thunderstorms may produce heavy rainfall after midnight. Warm with Lows in the mid 60s. South Winds around 5 Mph. Chance of rain 90 percent.
Greenville Temperature Statistics
September Temperature
Port Meadville Airport (17.4 miles)
Lowest 7 September, 2026
52 °FAverage September
69.9 °FHighest 2 September, 2026
87.1 °F
Climate (2021–2026)
Port Meadville Airport (17.4 miles)
Average Low 2021–2026
42.7 °FAverage 2021–2026
50.9 °FAverage High 2021–2026
59.3 °F