October weather forecast
Sun Valley, ID

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The iconic Sun Valley, Idaho, in a stunning hilly landscape on either side located within the famous White Cloud Wilderness
The iconic Sun Valley, Idaho, in a stunning hilly landscape on either side located within the famous White Cloud Wilderness

Weather in October

October sees a further dip in Sun Valley's weather with autumn's chill becoming more pronounced. High temperatures reduce significantly from September's 63.7°F (17.6°C) to a cooler 48°F (8.9°C) in October. The city undergoes an aesthetic transformation with fall foliage dressing up the cityscape. However, one can expect early snowfall towards the month's end, hinting at the approaching winter. In essence, October perfectly encapsulates the changing seasons, personifying Sun Valley's natural charm.

Temperature

A distinct shift in the average high-temperature is signaled in October, moving down from a refreshing 63.7°F (17.6°C) in September to a frosty 48°F (8.9°C). October witnesses an average low-temperature hovering around a subzero cold 31.1°F (-0.5°C).

Humidity

In October, the average relative humidity is 61%.

Rainfall

In Sun Valley, during October, the rain falls for 9.3 days and regularly aggregates up to 1.06" (27mm) of precipitation. In Sun Valley, Idaho, during the entire year, the rain falls for 107.7 days and collects up to 15.63" (397mm) of precipitation.

Snowfall

January through June, September through December are months with snowfall. In October, in Sun Valley, it is snowing for 3.4 days. Throughout October, 2.32" (59mm) of snow is accumulated. In Sun Valley, during the entire year, snow falls for 88.2 days and aggregates up to 69.45" (1764mm) of snow.

Daylight

The average length of the day in October is 10h and 59min.
On the first day of October, sunrise is at 7:35 am and sunset at 7:17 pm. On the last day of the month, sunrise is at 8:13 am and sunset at 6:28 pm MDT.

Sunshine

In October, the average sunshine in Sun Valley is 7.7h.

UV index

In October, the average daily maximum UV index is 2. A UV Index value of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV rays for the average person.
Note: A maximum UV index of 2 in October translates into the following recommendations:
Despite most people tolerating extended sun exposure, it is critical to always protect those with sensitive skin, infants, and children. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Always opt for UVA and UVB-resistant sunglasses on radiant days. Be attentive! The reflective property of snow can nearly double the Sun's UV radiation.
Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in Sun Valley in October?

An average high-temperature, in October, in Sun Valley, is 48°F (8.9°C) and the average low-temperature is 31.1°F (-0.5°C).

What is the average humidity in October in Sun Valley?

In Sun Valley, the average relative humidity in October is 61%.

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

In October, in Sun Valley, Idaho, the rain falls for 9.3 days. Throughout October, 1.06" (27mm) of precipitation is accumulated.

How many days does it snow in October in Sun Valley?

In October, it is snowing for 3.4 days. Throughout October, 2.32" (59mm) of snow is accumulated.

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

In Sun Valley, the average day length in October is 10h and 59min.

When is the sunrise / sunset in October in Sun Valley?

On the first day of October, sunrise is at 7:35 am and sunset at 7:17 pm. On the last day of the month, sunrise is at 8:13 am and sunset at 6:28 pm MDT.

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

The average sunshine duration in October is 7.7h.

How high is the UV index in October in Sun Valley?

In Sun Valley, Idaho, the average daily maximum UV index in October is 2. A UV Index estimate of 2, and below, represents a minimal hazard to health from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in October
Sun Valley, ID

Average temperature in October - Sun Valley, ID
  • Average high temperature in October: 48°F

The warmest month (with the highest average high temperature) is July (74.1°F).
The month with the lowest average high temperature is December (25°F).

  • Average low temperature in October: 31.1°F

The months with the highest average low temperature are July and August (50.5°F).
The coldest month (with the lowest average low temperature) is January (8.4°F).

Average pressure in October
Sun Valley, ID

Average pressure in October - Sun Valley, ID
  • Average pressure in October: 30.05"Hg

The month with the highest atmospheric pressure is January (30.27"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).

Average wind speed in October
Sun Valley, ID

Average wind speed in October - Sun Valley, ID
  • Average wind speed in October: 5.2mph

The windiest month (with the highest average wind speed) is July (6.3mph).
The calmest month (with the lowest average wind speed) is January (4.5mph).

Average humidity in October
Sun Valley, ID

Average humidity in October - Sun Valley, ID
  • Average humidity in October: 61%

The month with the highest relative humidity is February (87%).
The month with the lowest relative humidity is August (37%).

Average rainfall in October
Sun Valley, ID

Average rainfall in October - Sun Valley, ID
  • Average rainfall in October: 1.06"

The wettest month (with the highest rainfall) is March (2.01").
The driest month (with the least rainfall) is July (0.43").

Average rainfall days in October
Sun Valley, ID

Average rainfall days in October - Sun Valley, ID
  • Average rainfall days in October: 9.3 days

The month with the highest number of rainy days is May (14.8 days).
The month with the least rainy days is July (5.9 days).

Average snowfall in October
Sun Valley, ID

Average snowfall in October - Sun Valley, ID
  • Average snowfall in October: 2.32"

The month with the highest snowfall is February (15").
The months with the least snowfall are July and August (0").

Average snowfall days in October
Sun Valley, ID

Average snowfall days in October - Sun Valley, ID
  • Average snowfall days in October: 3.4 days

The month with the highest number of snowfall days is March (16 days).
The months with the least snowfall days are July and August (0 days).

Average daylight in October /
Average sunshine in October
Sun Valley, ID

Average daylight in October / Average sunshine in October - Sun Valley, ID
  • Average daylight in October: 11h and 0min

The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).

  • Average sunshine in October: 7h and 4min

The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 5h and 42min).

Average sunshine days in October
Sun Valley, ID

Average sunshine days in October - Sun Valley, ID
  • Average sunshine days in October: 18.2 days

The month with the most sunshine days is July (20.8 days).
The month with the least sunshine days is April (11.1 days).

Average UV index in October
Sun Valley, ID

Average UV index in October - Sun Valley, ID
  • Average UV index in October: 2

The months with the highest UV index are June and July (UV index 5).
The month with the lowest UV index is February (UV index 1).

Average cloud cover in October
Sun Valley, ID

Average cloud cover in October - Sun Valley, ID
  • Average cloud cover in October: 22

The month with the most cloud cover is February (Cloud cover 44).
The month with the least cloud cover is July (Cloud cover 10).

Average visibility in October
Sun Valley, ID

Average visibility in October - Sun Valley, ID
  • Average visibility in October: 6mi

The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (4mi).

Sun Valley, Idaho, USA

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