Sun Valley climate

Sun Valley Weather in October

NOAA 1991-2020 normals for Ketchum RS, 1.6 km from Sun Valley

Average highs run from 63°F on October 1 to 49°F on October 31, and lows from 32°F to 23°F. Normal precipitation for the month is 1.40 in over about 5 wet days.

October day by day

The normal high and low for each date, and the record, in °F.

Normal daily high and low temperature at Sun Valley, in °F, with the record for each date.020406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

October at a glance

Average high
56°F
Average low
28°F
Precipitation
1.40 in
Snowfall
1.6 in
Record high
81°FOct 10, 2015
Record low
6°FOct 30, 2019
Chance of a freeze
100%
Daylight
11 h 43 min to 10 h 17 min
Cloud cover
48%
Humidity
54%
Dew point
24°F
Wind
6.9 mph

Every day of the month

A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.

DateNormal highNormal lowRecord highRecord lowChance wetChance of snow
Oct 163°F32°F79°F 202029°F 201916%1%
Oct 262°F32°F79°F 202426°F 201916%1%
Oct 362°F32°F76°F 202030°F 201916%1%
Oct 461°F31°F80°F 202432°F 201816%1%
Oct 561°F31°F78°F 202124°F 201816%1%
Oct 661°F31°F78°F 202427°F 201916%1%
Oct 760°F31°F78°F 202427°F 201816%1%
Oct 860°F30°F79°F 202427°F 201816%1%
Oct 959°F30°F80°F 202426°F 201816%1%
Oct 1059°F30°F81°F 201517°F 201916%2%
Oct 1158°F29°F75°F 202418°F 201916%2%
Oct 1258°F29°F78°F 202423°F 201716%2%
Oct 1357°F29°F78°F 201525°F 201816%2%
Oct 1457°F28°F79°F 201523°F 201816%2%
Oct 1556°F28°F79°F 202422°F 201816%2%
Oct 1656°F28°F78°F 201526°F 202216%2%
Oct 1756°F28°F74°F 201533°F 202116%3%
Oct 1855°F27°F75°F 202225°F 201916%3%
Oct 1955°F27°F74°F 202226°F 201916%3%
Oct 2054°F27°F75°F 202318°F 201916%3%
Oct 2154°F26°F74°F 202325°F 201716%3%
Oct 2253°F26°F71°F 202325°F 202016%4%
Oct 2353°F26°F68°F 202323°F 202016%4%
Oct 2452°F25°F68°F 201422°F 202216%4%
Oct 2552°F25°F67°F 201417°F 202017%4%
Oct 2651°F25°F69°F 20169°F 202017%4%
Oct 2751°F24°F68°F 201819°F 201917%5%
Oct 2850°F24°F65°F 201712°F 201917%5%
Oct 2950°F24°F67°F 201712°F 201917%5%
Oct 3049°F23°F65°F 20146°F 201917%6%
Oct 3149°F23°F62°F 201414°F 201917%6%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Sun Valley, in percent, and of at least 0.1 inch of snowfall.051015201102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (MDT).

October 1
sunrise 7:35 AM, sunset 7:18 PM
October 31
sunrise 8:12 AM, sunset 6:29 PM

Every day of October: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00104845 (Ketchum RS), public domain. Records: NOAA GHCN-Daily, station USC00100774, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.