May Weather in Lancaster, United States

Last updated: June 24, 2025

In Lancaster, United States, the average temperature in May hovers around 19°C (67°F). Temperatures can range from a cool 6°C (43°F) to a sweltering 36°C (98°F). You'll experience a modest precipitation of approximately 7 mm (0.3 in) over just 1 day, accompanied by an average humidity level of 57%.

May Temperature in Lancaster

In May in Lancaster, the average temperature is 19°C (67°F), with maximums reaching 36°C (98°F) and minimums dropping as low as 6°C (43°F). This diverse range of temperatures makes Lancaster an ideal destination for travelers seeking both warmth and 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 19°C (67°F), with highs reaching up to 36°C (98°F) and lows dropping to around 6°C (43°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 7 mm (0.3 in) over the course of 1 day.

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 7 mm (0.3 inches) of precipitation spread over approximately 1 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 57%. With an average temperature of 19°C (67°F), this humidity feels like a warm embrace, making it an ideal time for exploring the area's hidden gems, but travelers should be prepared for a slight stickiness that may encourage leisurely breaks in shaded spots.

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 57%, 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 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, 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 11, which falls under the extreme 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	9°C (49°F)	41 mm (1.6 inches)	78%	moderate
February Weather	10°C (50°F)	31 mm (1.2 inches)	82%	high
March Weather	12°C (54°F)	38 mm (1.5 inches)	75%	very high
April Weather	16°C (62°F)	17 mm (0.7 inches)	68%	very high
May Weather	19°C (67°F)	7 mm (0.3 inches)	57%	extreme
June Weather	24°C (76°F)	1 mm (0.0 inches)	52%	extreme
July Weather	28°C (82°F)	2 mm (0.1 inches)	46%	extreme
August Weather	27°C (81°F)	1 mm (0.1 inches)	39%	extreme
September Weather	24°C (76°F)	2 mm (0.1 inches)	48%	very high
October Weather	18°C (65°F)	3 mm (0.1 inches)	59%	high
November Weather	14°C (57°F)	12 mm (0.5 inches)	72%	moderate
December Weather	9°C (48°F)	42 mm (1.7 inches)	76%	moderate