Mount Gretna Weather Forecast
- 69
- 87
Severe Tstms
- 59
- 81
Mostly Sunny
- 67
- 83
Chance Rain Showers
- 68
- 84
Rain Showers
- 61
- 83
Chance Thunderstorms
- 61
- 80
Mostly Sunny
Today 18 Jul Lebanon
Showers likely with a chance of Thunderstorms this Morning, then Showers with Thunderstorms likely this afternoon. Patchy smoke. Some Thunderstorms may produce gusty Winds and small hail this morning. Some Thunderstorms may be severe with damaging Winds, large Hail, and Tornadoes this afternoon. Highs in the upper 80s. South Winds 5 to 10 Mph, becoming southwest with Gusts up to 20 Mph this afternoon. Chance of rain 90 percent.
Tonight 18 Jul Lebanon
Mostly cloudy. Numerous Showers and Thunderstorms, mainly in the evening. Some Thunderstorms may produce gusty Winds and small hail. Humid with Lows in the upper 60s. West Winds 5 to 10 Mph with Gusts up to 25 Mph. Chance of rain 70 percent.
Mount Gretna Temperature Statistics
July Temperature
Lancaster, Lancaster Airport (12.4 miles)
Lowest 13 July, 2026
63 °FAverage July
78.6 °FHighest 2 July, 2026
102.9 °F
Climate (2021–2026)
Lancaster, Lancaster Airport (12.4 miles)
Average Low 2021–2026
45.9 °FAverage 2021–2026
55.5 °FAverage High 2021–2026
65.1 °F