Sun Valley
Idaho, USA
Long-term weather forecast
Long-term weather forecast

May weather forecast and climate
Sun Valley, ID

The iconic Sun Valley, Idaho, in a stunning hilly landscape on either side located within the famous White Cloud Wilderness, white clouds above
The iconic Sun Valley, Idaho, in a stunning hilly landscape on either side located within the famous White Cloud Wilderness, white clouds above
May, the last month of the spring, in Sun Valley, is a comfortable month, with temperature in the range of an average low of 29.1°F (-1.6°C) and an average high of 63.9°F (17.7°C).

Temperature

In May, the average high-temperature increases, from a fresh 52.2°F (11.2°C) in April, to an enjoyable 63.9°F (17.7°C). In Sun Valley, the average low-temperature is 29.1°F (-1.6°C).

Rainfall

In May, in Sun Valley, Idaho, the rain falls for 11 days. Throughout May, 1.6" (40.9mm) of precipitation is accumulated. Throughout the year, there are 122 rainfall days, and 17.2" (438.1mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Sun Valley, Idaho, are January through May, September through December.

Daylight

In May, the average length of the day in Sun Valley, Idaho, is 14.7h.

Sunshine

The average sunshine in May is 9h.

UV index

The average daily maximum UV index in Sun Valley is 8. A UV Index of 8 to 10 symbolizes a very high threat to health from the exposure to the Sun's UV rays for the average person.
The average daily UV index of 8 transform into the following instructions:
Take extra precautions. Fair-skinned individuals may get burned in less than 10 minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the temperature in May in Sun Valley?

In Sun Valley, Idaho, in May, the average high-temperature is 63.9°F (17.7°C), and the average low-temperature is 29.1°F (-1.6°C).

How many days does it rain in May in Sun Valley?

In Sun Valley, in May, during 11 rainfall days, 1.6" (40.9mm) of precipitation is typically accumulated.

What is the last month it snows in Sun Valley?

May is the last month it regularly snows in Sun Valley, Idaho. Throughout May, Sun Valley aggregates 1.4" (35.6mm) of snow.

How many hours of daylight does Sun Valley have in May?

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

How long on average sun shines in May in Sun Valley?

In Sun Valley, Idaho, the average sunshine in May is 9h.

What is the UV index intensity in May in Sun Valley?

In Sun Valley, Idaho, the average daily maximum UV index in May is 8. A UV Index value of 8 to 10 symbolizes a very high health vulnerability from unprotected exposure to the UV radiation.
Average temperature in May - Sun Valley, ID
  • Average high temperature in May: 63.9°F

The warmest month (with the highest average high temperature) is July (82.5°F).
The month with the lowest average high temperature is January (30°F).

  • Average low temperature in May: 29.2°F

The month with the highest average low temperature is July (38.3°F).
The coldest month (with the lowest average low temperature) is January (0.3°F).

Average rainfall in May - Sun Valley, ID
  • Average rainfall in May: 1.6"

Wettest months (with the highest rainfall) are January and December (2.6").
The driest month (with the lowest rainfall) is July (0.7").

Average rainfall days in May - Sun Valley, ID
  • Average rainfall days in May: 11 days

Months with the highest number of rainy days are January, March and December (13 days).
Months with the lowest number of rainy days are July and October (7 days).

Average snowfall in May - Sun Valley, ID
  • Average snowfall in May: 1.4"

The month with the highest snowfall is January (36").
Months with the lowest snowfall are June, July and August (0").

Average daylight in May / Average sunshine in May - Sun Valley, 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: 9h

The month with most sunshine is July (Average sunshine: 12h).
Months with least sunshine are January, November and December (Average sunshine: 4).

Average UV index in May - Sun Valley, ID
  • Average UV index in May: 8

The month with the highest UV index is July (UV index 10).
The month with the lowest UV index is December (UV index 1).