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May Weather in Boise City, United States

Last updated: June 24, 2025

In Boise City, United States, the average temperature in May hovers around 18°C (64°F), providing a comfortable climate for outdoor adventures. However, be prepared for a temperature range that can drop to a chilly -1°C (31°F) or soar up to a sizzling 36°C (97°F). During this month, you can expect about 60 mm (2.4 in) of precipitation spread over 10 days, contributing to an average humidity level of 71%.

May Temperature in Boise City

In May, in Boise City, the average temperature is 18°C (64°F). The maximum can reach 36°C (97°F), and the minimum can be as low as -1°C (31°F). Be prepared for a wide range of temperatures when traveling to Boise City in May.

May Weather in Boise City: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Boise City, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Boise City, May typically has an average temperature of 18°C (64°F), with highs reaching up to 36°C (97°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec363748556475797671564739
Data source: Temperature data for Boise City generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

May Precipitation in Boise City

In Boise City in May, the precipitation amount is 60 mm (2.4 in) accumulated over a period of 10 days.

May Precipitation Trends in Boise City

The chart displays monthly precipitation patterns in Boise City, 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 Boise City, May typically receives around 60 mm (2.4 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec16113641603744553234715
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Boise City

In Boise City in May, humidity is 71%. With an average temperature of 18°C (64°F), this humidity feels like a warm embrace, making traveling a bit sticky but still pleasant as the warmth envelops you, urging you to explore the vibrant surroundings while staying hydrated.

May Average Humidity in Boise City

This chart illustrates the average monthly humidity levels in Boise City, 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 Boise City is approximately 71%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec73%76%64%61%71%75%75%80%80%78%76%78%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Boise City

In Boise City 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 Boise City.

Maximum UV Index Levels in Boise City for May

The chart shows the monthly maximum UV Index (UVI) for Boise City 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 Boise City typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101112121110753
Data source: Boise City 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 Boise City Compares to Other Months

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

This table compares monthly weather conditions in Boise City, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (36°F)16 mm (0.6 inches)73%moderate
February Weather3°C (37°F)11 mm (0.4 inches)76%high
March Weather9°C (49°F)36 mm (1.4 inches)64%very high
April Weather13°C (55°F)41 mm (1.6 inches)61%very high
May Weather18°C (64°F)60 mm (2.4 inches)71%extreme
June Weather24°C (76°F)37 mm (1.5 inches)75%extreme
July Weather26°C (79°F)44 mm (1.7 inches)75%extreme
August Weather25°C (77°F)55 mm (2.2 inches)80%extreme
September Weather22°C (71°F)32 mm (1.3 inches)80%very high
October Weather13°C (56°F)34 mm (1.3 inches)78%high
November Weather8°C (47°F)7 mm (0.3 inches)76%moderate
December Weather4°C (39°F)15 mm (0.6 inches)78%moderate

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