May weather forecast and climate
Boise, ID

The golden fall season in Boise, Idaho
The golden fall season in Boise, Idaho

Weather in May

May, the last month of the spring, in Boise, is an enjoyable month, with average temperature varying between 45.1°F (7.3°C) and 67.1°F (19.5°C).

Temperature

In Boise, the average high-temperature in May increases, from a moderate 56.7°F (13.7°C) in April, to an enjoyable 67.1°F (19.5°C). The average low-temperature, is 45.1°F (7.3°C).

Humidity

In May, the average relative humidity is 51%.

Rainfall

In Boise, Idaho, in May, during 11.1 rainfall days, 1.46" (37mm) of precipitation is typically accumulated. Throughout the year, in Boise, there are 116.8 rainfall days, and 15.08" (383mm) of precipitation is accumulated.

Snowfall

May through October are months without snowfall in Boise.

Daylight

The average length of the day is 14.7h.

Sunshine

In Boise, the average sunshine is 10.9h.

UV index

In Boise, the average daily maximum UV index in May is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from the exposure to the Sun's UV radiation for the average person.
Note: The daily maximum UV index of 5 interpret into the following advice:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in May in Boise?

The average high-temperature, in May, in Boise, is 67.1°F (19.5°C), while the average low-temperature is 45.1°F (7.3°C).

What is the average humidity in May in Boise?

The average relative humidity in May in Boise, Idaho, is 51%.

How much does it rain in Boise in May?

In Boise, Idaho, in May, during 11.1 rainfall days, 1.46" (37mm) of precipitation is typically accumulated.

Does it snow in Boise in May?

In May, it doesn't snow. April is the latest month when it typically snows.

When it does not snow in Boise?

May through October are months without snowfall in Boise.

What is the average length of the day in May in Boise?

In May, the average length of the day in Boise is 14.7h.

How long on average sun shines in May in Boise?

The average sunshine in May in Boise, Idaho, is 10.9h.

What is the UV index intensity in May in Boise?

In May, the average daily maximum UV index in Boise is 5. A UV Index estimate of 3 to 5 represents a medium health risk from the exposure to the Sun's UV rays.

Average temperature in May
Boise, ID

Average temperature in May - Boise, ID
  • Average high temperature in May: 67.1°F

The warmest month (with the highest average high temperature) is July (87.8°F).
The month with the lowest average high temperature is December (34.7°F).

  • Average low temperature in May: 45.1°F

The month with the highest average low temperature is August (61.3°F).
The coldest month (with the lowest average low temperature) is December (23.2°F).

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Average pressure in May
Boise, ID

Average pressure in May - Boise, ID
  • Average pressure in May: 29.92"

The month with the highest atmospheric pressure is January (30.25").
The month with the lowest atmospheric pressure is June (29.9").

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Average wind speed in May
Boise, ID

Average wind speed in May - Boise, ID
  • Average wind speed in May: 6.3mph

The windiest month (with the highest average wind speed) is April (7.1mph).
The calmest month (with the lowest average wind speed) is January (5.2mph).

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Average humidity in May
Boise, ID

Average humidity in May - Boise, ID
  • Average humidity in May: 51%

The month with the highest relative humidity is January (80%).
The month with the lowest relative humidity is July (30%).

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Average rainfall in May
Boise, ID

Average rainfall in May - Boise, ID
  • Average rainfall in May: 1.46"

The wettest month (with the highest rainfall) is March (2.2").
The driest month (with the least rainfall) is July (0.2").

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Average rainfall days in May
Boise, ID

Average rainfall days in May - Boise, ID
  • Average rainfall days in May: 11.1 days

The month with the highest number of rainy days is March (16.2 days).
The month with the least rainy days is July (4.5 days).

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Average snowfall in May
Boise, ID

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

The month with the highest snowfall is December (6.65").
Months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in May
Boise, ID

Average snowfall days in May - Boise, ID
  • Average snowfall days in May: 0.1 days

The month with the highest number of snowfall days is December (9.2 days).
Months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in May /
Average sunshine in May
Boise, ID

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 the shortest days is December (Average daylight: 9h).

  • Average sunshine in May: 10.9h

The month with the most sunshine is July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 5.5h).

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Average sunshine days in May
Boise, ID

Average sunshine days in May - Boise, ID
  • Average sunshine days in May: 16.3 days

The month with the most sunshine days is July (23.6 days).
The month with the least sunshine days is March (12.1 days).

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Average UV index in May
Boise, ID

Average UV index in May - Boise, ID
  • Average UV index in May: 5

The month with the highest UV index is July (UV index 7).
Months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in May
Boise, ID

Average cloud cover in May - Boise, ID
  • Average cloud cover in May: 24

The month with the most cloud cover is December (Cloud cover 42).
The month with the least cloud cover is July (Cloud cover 8).

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Average visibility in May
Boise, ID

Average visibility in May - Boise, ID
  • Average visibility in May: 6mi

Months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).

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