May weather forecast
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 a comfortable month, with an average temperature fluctuating between 45.1°F (7.3°C) and 67.1°F (19.5°C).

Temperature

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

Humidity

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

Rainfall

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

Snowfall

In Boise, snow does not fall in May through October.

Daylight

In May, the average length of the day is 14h and 44min.
On the first day of May, sunrise is at 6:36 am and sunset at 8:47 pm. On the last day of the month, sunrise is at 6:06 am and sunset at 9:18 pm MDT.

Sunshine

In May, the average sunshine in Boise is 10.9h.

UV index

The average daily maximum UV index in May in Boise is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the average person.
Note: The average daily UV index of 5 in May transform into the following instructions:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the average humidity in May in Boise?

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

How much does it rain in Boise in May?

In May, in Boise, Idaho, the rain falls for 11.1 days. Throughout May, 1.46" (37mm) of precipitation is accumulated.

When it does not snow in Boise?

In Boise, snow does not fall in May through October.

Does it snow in Boise in May?

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

How many hours of daylight does Boise have in May?

The average day length in May in Boise, Idaho, is 14h and 44min.

When is the sunrise / sunset in May in Boise?

On the first day of May in Boise, Idaho, sunrise is at 6:36 am and sunset at 8:47 pm. On the last day of the month, sunrise is at 6:06 am and sunset at 9:18 pm MDT.

How long on average sun shines in May in Boise?

The average sunshine duration in May in Boise is 10.9h.

What is the UV index reading in May in Boise?

In Boise, Idaho, the average daily maximum UV index in May is 5. A UV Index reading of 3 to 5 represents a medium hazard to health from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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"Hg

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

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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").
The 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).
The 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: 14h and 44min

The month with the longest days is June (Average daylight: 15h and 23min).
The month with the shortest days is December (Average daylight: 9h and 0min).

  • Average sunshine in May: 10h and 54min

The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).

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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).
The 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

The 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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