May weather forecast and climate
Boise, ID

The golden fall season in Boise, Idaho, with the tall city buildings in view
The golden fall season in Boise, Idaho, with the tall city buildings in view

What is the temperature in May in Boise?

In Boise, in May, the average high-temperature is 71.6°F (22°C), and the average low-temperature is 46.6°F (8.1°C).

How much does it rain in Boise in May?

In Boise, during May, the rain falls for 7.7 days and regularly aggregates up to 1.4" (35.3mm) of precipitation.

Does it snow in Boise in May?

In May, it doesn't snow. April is the latest month when it typically snows.
Average temperature in May - Boise, ID
  • Average high temperature in May: 22°C

The warmest month (with the highest average high temperature) is July (32.9°C).
The month with the lowest average high temperature is December (3.1°C).

  • Average low temperature in May: 8.1°C

The month with the highest average low temperature is July (15.8°C).
The coldest month (with the lowest average low temperature) is December (-4.4°C).

Average humidity in May - Boise, ID
  • Average humidity in May: 48.7%

The month with the highest relative humidity is January (75%).
The month with the lowest relative humidity is July (36.1%).

Average rainfall in May - Boise, ID
  • Average rainfall in May: 35.3mm

The wettest month (with the highest rainfall) is December (39.4mm).
The driest month (with the lowest rainfall) is August (6.1mm).

Average rainfall days in May - Boise, ID
  • Average rainfall days in May: 7.7 days

The month with the highest number of rainy days is December (11.8 days).
The month with the lowest number of rainy days is August (2.4 days).

Average snowfall in May - Boise, ID
  • Average snowfall in May: 0mm

The month with the highest snowfall is December (177.8mm).
Months with the lowest snowfall are May, June, July, August and September (0mm).

Average snowfall days in May - Boise, ID
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is December (6 days).
Months with the lowest number of snowfall days are May, June, July, August and September (0 days).

Average daylight in May / Average sunshine in May - Boise, ID
  • Average daylight in May: 14.7h

The month with the longest days is June (Average daylight: 15.4h).
The month with shortest days is December (Average daylight: 9h).

  • Average sunshine in May: 10.8h

The month with most sunshine is July (Average sunshine: 12.9h).
The month with least sunshine is December (Average sunshine: 3.4h).

Average UV index in May - Boise, ID
  • Average UV index in May: 7

Months with the highest UV index are June and July (UV index 9).
Months with the lowest UV index are January and December (UV index 1).

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