Sun Valley climate

Sun Valley Weather in May

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

Average highs run from 57°F on May 1 to 65°F on May 31, and lows from 31°F to 38°F. Normal precipitation for the month is 1.78 in over about 8 wet days.

May 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.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

May at a glance

Average high
62°F
Average low
35°F
Precipitation
1.78 in
Snowfall
0.2 in
Record high
91°FMay 29, 2020
Record low
22°FMay 3, 2019
Chance of a freeze
99%
Daylight
14 h 11 min to 15 h 13 min
Cloud cover
61%
Humidity
58%
Dew point
32°F
Wind
7.8 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
May 157°F31°F80°F 202326°F 201924%3%
May 258°F31°F80°F 202326°F 202425%3%
May 358°F32°F77°F 202522°F 201925%2%
May 458°F32°F78°F 201729°F 202025%2%
May 559°F32°F79°F 201731°F 202325%2%
May 659°F32°F80°F 201828°F 202325%2%
May 759°F33°F75°F 202627°F 202325%2%
May 860°F33°F76°F 201823°F 202225%2%
May 960°F33°F78°F 202527°F 202125%2%
May 1060°F33°F83°F 202525°F 201925%1%
May 1161°F34°F81°F 202529°F 202125%1%
May 1261°F34°F86°F 202631°F 202326%1%
May 1361°F34°F87°F 202634°F 202026%1%
May 1461°F34°F78°F 201931°F 201726%1%
May 1562°F35°F73°F 202232°F 202526%1%
May 1662°F35°F78°F 202130°F 201726%1%
May 1762°F35°F79°F 202131°F 202626%1%
May 1862°F35°F74°F 201631°F 202426%1%
May 1963°F36°F79°F 202331°F 202626%1%
May 2063°F36°F78°F 202331°F 202426%1%
May 2163°F36°F78°F 202332°F 202226%1%
May 2263°F36°F76°F 202332°F 201626%1%
May 2364°F36°F79°F 202627°F 202426%1%
May 2464°F37°F81°F 202631°F 202426%0%
May 2564°F37°F81°F 201835°F 202326%0%
May 2664°F37°F82°F 202533°F 202426%0%
May 2764°F37°F81°F 202539°F 201726%0%
May 2865°F37°F84°F 202037°F 201626%0%
May 2965°F37°F91°F 202038°F 202126%0%
May 3065°F38°F87°F 202034°F 202426%0%
May 3165°F38°F89°F 202539°F 202426%0%

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.01020301102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (MDT).

May 1
sunrise 6:29 AM, sunset 8:40 PM
May 31
sunrise 5:59 AM, sunset 9:12 PM

Every day of May: 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.