May Weather in Lancaster, United States

Last updated: June 24, 2025

In Lancaster, United States, the average temperature in May hovers around 20°C (68°F), with minimums dipping to 5°C (41°F) and soaring highs reaching up to 35°C (96°F). Expect about 100 mm (3.9 in) of precipitation spread over 11 days, creating an average humidity level of 80%. Whether you're exploring or relaxing, be prepared for a blend of warmth and moisture!

May Temperature in Lancaster

In May in Lancaster, the average temperature is 20°C (68°F), with maximums reaching 35°C (96°F) and minimums dipping down to 5°C (41°F). This varying climate makes Lancaster an ideal destination for travelers seeking both warmth and the opportunity to experience cooler evenings.

May Weather in Lancaster: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Lancaster, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lancaster, May typically has an average temperature of 20°C (68°F), with highs reaching up to 35°C (96°F) and lows dropping to around 5°C (41°F).

Data source: Temperature data for Lancaster generated using information from the Copernicus Climate Change Service.

May Precipitation in Lancaster

In Lancaster in May, the precipitation amount is 100 mm (3.9 in) over the course of 11 days.

May Precipitation Trends in Lancaster

The chart displays monthly precipitation patterns in Lancaster, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Lancaster, May typically receives around 100 mm (3.9 inches) of precipitation spread over approximately 11 days.

Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

May Humidity in Lancaster

In Lancaster in May, humidity is 80%. With an average temperature of 20°C (68°F), this humidity feels like traveling through a warm, dense blanket that clings to your skin, making you feel both sticky and lethargic as you explore the sights.

May Average Humidity in Lancaster

This chart illustrates the average monthly humidity levels in Lancaster, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Lancaster is approximately 80%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Lancaster

In Lancaster in May, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Lancaster.

Maximum UV Index Levels in Lancaster for May

The chart shows the monthly maximum UV Index (UVI) for Lancaster in May, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In May, the maximum UV index in Lancaster typically reaches 10, which falls under the very high exposure category.

Data source: Lancaster May UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How May Weather in Lancaster Compares to Other Months

Weather in Lancaster varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Lancaster, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Lancaster, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	4°C (40°F)	76 mm (3.0 inches)	84%	moderate
February Weather	7°C (44°F)	105 mm (4.1 inches)	83%	moderate
March Weather	9°C (49°F)	92 mm (3.6 inches)	82%	high
April Weather	15°C (59°F)	97 mm (3.8 inches)	81%	very high
May Weather	20°C (68°F)	100 mm (3.9 inches)	80%	very high
June Weather	24°C (76°F)	109 mm (4.3 inches)	82%	very high
July Weather	27°C (81°F)	133 mm (5.2 inches)	81%	very high
August Weather	26°C (79°F)	158 mm (6.2 inches)	81%	very high
September Weather	23°C (74°F)	117 mm (4.6 inches)	78%	very high
October Weather	18°C (65°F)	129 mm (5.1 inches)	80%	high
November Weather	11°C (51°F)	79 mm (3.1 inches)	84%	moderate
December Weather	7°C (45°F)	96 mm (3.8 inches)	84%	moderate