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Lancaster Weather by Month
Average temperatures, rainfall and humidity for Lancaster, United States, month by month, built from OpenWeather’s historical records. Use it to see what a typical Lancaster month looks like before you travel — then check the live Lancaster forecast for the days ahead.
Warmest month
July
31°C average high
Coolest month
January
-2°C average low
Wettest month
May
132 mm of rain
Driest month
February
55 mm of rain
Average temperature and rainfall in Lancaster by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 6°C | -2°C | -16°C / 23°C | 73 mm | 70% | 12 km/h |
| February | 8°C | 0°C | -18°C / 26°C | 55 mm | 68% | 12 km/h |
| March | 13°C | 3°C | -16°C / 28°C | 70 mm | 63% | 14 km/h |
| April | 19°C | 9°C | -4°C / 32°C | 104 mm | 63% | 14 km/h |
| May | 24°C | 14°C | 1°C / 36°C | 132 mm | 71% | 11 km/h |
| June | 28°C | 18°C | 9°C / 38°C | 123 mm | 70% | 10 km/h |
| July | 31°C | 21°C | 14°C / 39°C | 102 mm | 74% | 9 km/h |
| August | 29°C | 20°C | 12°C / 36°C | 84 mm | 75% | 9 km/h |
| September | 26°C | 17°C | 6°C / 36°C | 91 mm | 76% | 10 km/h |
| October | 20°C | 11°C | 0°C / 33°C | 93 mm | 76% | 10 km/h |
| November | 13°C | 4°C | -10°C / 27°C | 95 mm | 69% | 11 km/h |
| December | 9°C | 1°C | -14°C / 21°C | 81 mm | 73% | 11 km/h |
Best time to visit Lancaster
The most comfortable time to visit Lancaster is generally May and September to October, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around May, totalling about 1,104 mm a year.
Travellers who prefer heat should aim for July, when highs average 31°C. May is the month to avoid if rain would spoil your plans — it averages 132 mm, roughly 2× the rainfall of the driest month (February).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Lancaster forecast for what is happening now.