May Weather in Barstow, United States

Last updated: June 24, 2025

In May, the average temperature in Barstow, United States hovers around 22°C (71°F), with a comfortable humidity level of 45%. However, be prepared for extremes, as temperatures can dip to a minimum of 5°C (42°F) or soar to a sweltering 40°C (104°F). On average, expect light precipitation of just 3 mm (0.1 in) over the course of 1 day during this month.

May Temperature in Barstow

In May in Barstow, the average temperature is 22°C (71°F). Maximum can reach 40°C (104°F) and minimum can be as low as 5°C (42°F). It's advisable to pack for both warm and cool conditions to ensure a comfortable trip.

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

The chart illustrates May temperature patterns in Barstow, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Barstow, May typically has an average temperature of 22°C (71°F), with highs reaching up to 40°C (104°F) and lows dropping to around 5°C (42°F).

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

May Precipitation in Barstow

In Barstow in May, the precipitation amount is 3 mm (0.1 in) over the course of 1 day.

May Precipitation Trends in Barstow

The chart displays monthly precipitation patterns in Barstow, 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 Barstow, May typically receives around 3 mm (0.1 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 Barstow

In Barstow in May, humidity is 45%. With an average temperature of 22°C (71°F), this humidity feels like a comfortable and refreshing environment for traveling, allowing for pleasant outdoor activities without the discomfort of excessive moisture in the air.

May Average Humidity in Barstow

This chart illustrates the average monthly humidity levels in Barstow, 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 Barstow is approximately 45%, 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 Barstow

In Barstow 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 Barstow.

Maximum UV Index Levels in Barstow for May

The chart shows the monthly maximum UV Index (UVI) for Barstow 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 Barstow typically reaches 11, which falls under the extreme exposure category.

Data source: Barstow 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 Barstow Compares to Other Months

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

This table compares monthly weather conditions in Barstow, 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)	22 mm (0.9 inches)	76%	moderate
February Weather	11°C (51°F)	13 mm (0.5 inches)	80%	high
March Weather	14°C (57°F)	17 mm (0.7 inches)	69%	very high
April Weather	18°C (65°F)	11 mm (0.4 inches)	57%	very high
May Weather	22°C (71°F)	3 mm (0.1 inches)	45%	extreme
June Weather	28°C (83°F)	1 mm (0.0 inches)	34%	extreme
July Weather	31°C (89°F)	3 mm (0.1 inches)	29%	extreme
August Weather	31°C (88°F)	1 mm (0.0 inches)	28%	extreme
September Weather	27°C (80°F)	1 mm (0.0 inches)	41%	very high
October Weather	19°C (67°F)	2 mm (0.1 inches)	54%	very high
November Weather	14°C (57°F)	6 mm (0.2 inches)	68%	moderate
December Weather	8°C (47°F)	19 mm (0.7 inches)	75%	moderate