Sun Valley in Spring
In spring (March, April and May), Sun Valley sees average daytime highs around 58°F and overnight lows near 35°F, with 4.7 in of precipitation over about 22 wet days across the season. It is the 3rd-warmest season and the 2nd-wettest season.
Over the season highs climb from about 46°F in early March to 71°F by late May. The sky is clear or mostly clear about 35% of the time across spring, and the air most often feels dry.
Spring is Sun Valley's 3rd-best season to visit on our travel score. For the whole year in context, see Sun Valley's year-round climate.
- Avg daytime high
- 58°F
- 3rd-warmest season
- Avg overnight low
- 35°F
- Precipitation
- 4.7 in
- 22 wet days
- Avg wind
- 5 mph
- Travel score
- 4.5
- 3rd-best season
- Months
- Mar · Apr · May
Temperature in Sun Valley in Spring
Over the season highs climb from about 46°F in early March to 71°F by late May.
A typical spring day in Sun Valley reaches about 58°F and drops to 35°F overnight. The warmest of the three months is May, the coolest March.
How spring really feels in Sun Valley
Once humidity and wind are folded in, spring brings about 0 days that feel above 90°F and 55 that feel at or below 32°F.
The story in spring is cold — wind chill drags the overnight "feels like" below the raw low.
Sun Valley weather by month
How the three spring months (March, April and May) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 40° / 22° | 2.6 | 8 | 6.8 | 9.5 | 0.0 |
| Feb | 43° / 24° | 2.3 | 8.5 | 7.3 | 10.4 | 0.6 |
| Mar | 50° / 28° | 2.2 | 8 | 6 | 11.7 | 2.4 |
| Apr | 57° / 34° | 1.3 | 6.9 | 3.6 | 13 | 4.4 |
| May | 67° / 42° | 1.2 | 6.8 | 1.2 | 14.1 | 6.8 |
| Jun | 78° / 50° | 0.6 | 3.5 | 0.2 | 14.7 | 8.1 |
| Jul | 87° / 56° | 0.4 | 2.8 | 0 | 14.5 | 6.1 |
| Aug | 85° / 56° | 0.3 | 2.7 | 0 | 13.6 | 6.6 |
| Sep | 77° / 50° | 0.4 | 2.5 | 0 | 12.3 | 8.6 |
| Oct | 64° / 40° | 0.9 | 3.5 | 0.8 | 10.9 | 7.0 |
| Nov | 50° / 29° | 1.4 | 5.7 | 3.6 | 9.8 | 2.6 |
| Dec | 39° / 21° | 2.5 | 7.6 | 6.6 | 9.3 | 0.1 |
Cloud cover in Spring
The sky is clear or mostly clear about 35% of the time across spring.
Chance of precipitation in Spring
Sun Valley gets around 4.7 in of rain and snow over 22 wet days across spring. The line is the day-by-day chance of measurable precipitation.
Humidity in Spring
Most of spring feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Spring
Winds average 5 mph across spring.
Sunrise & sunset in Spring
Daylight runs from about 11 hours in early March to 14 h 36 min by late May. The lit band spans sunrise to sunset each day.
Solar energy in Spring
Average shortwave solar energy reaching the ground each day across spring, about 6.5 kWh/m².
Is spring a good time to visit Sun Valley?
Our two travel scores rate spring for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
spring is a reasonable time to visit Sun Valley for sightseeing.
What to pack for Sun Valley in Spring
From spring's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In spring, Sun Valley sees daytime highs around 58°F and nights near 35°F. Pack a warm layer and sun protection. Worth having: rain gear. About 22 days see rain.
UV index in Sun Valley in Spring
Clear-sky midday UV across spring averages around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Sun Valley peaks around June 22 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 23 at about 2 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 3 | 4 | 5 | 7 | 9 | 11 | 11 | 10 | 7 | 5 | 2 | 2 |
| Level | Moderate | Moderate | Moderate | High | Very high | Extreme | Extreme | Very high | High | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 3 | Moderate |
| Feb | 4 | Moderate |
| Mar | 5 | Moderate |
| Apr | 7 | High |
| May | 9 | Very high |
| Jun | 11 | Extreme |
| Jul | 11 | Extreme |
| Aug | 10 | Very high |
| Sep | 7 | High |
| Oct | 5 | High |
| Nov | 2 | Moderate |
| Dec | 2 | Moderate |
Air quality in Sun Valley in Spring
Average fine-particle pollution (PM2.5) through the year — so you can see where spring falls, not just the annual average.
Air quality in Sun Valley is worst in July — around 51 µg/m³ PM2.5 (poor), about 8.5× the cleanest month (December, 6 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 7 | 8 | 10 | 10 | 10 | 10 | 51 | 42 | 45 | 15 | 7 | 6 |
| Level | Good | Good | Good | Good | Good | Good | Poor | Poor | Poor | Moderate | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 7 | Good |
| Feb | 8 | Good |
| Mar | 10 | Good |
| Apr | 10 | Good |
| May | 10 | Good |
| Jun | 10 | Good |
| Jul | 51 | Poor |
| Aug | 42 | Poor |
| Sep | 45 | Poor |
| Oct | 15 | Moderate |
| Nov | 7 | Good |
| Dec | 6 | Good |
Where is Sun Valley?
Sun Valley sits at 39.6°N, 119.8°W, 4,724 ft above sea level, in United States. The nearest listed city is Sparks, 4.3 mi away.
Topography around Sun Valley
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Sun Valley.
Within 2 miles, the terrain around Sun Valley has significant variations in elevation — a maximum elevation change of 1,112 ft around an average of 4,898 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 3,911 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 7,779 ft.
The land around Sun Valley is covered by grassland (51%) and artificial surfaces (31%) within 2 miles, grassland (55%) and artificial surfaces (22%) within 10 miles, and grassland (40%) and trees (29%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Sun Valley (39.5963°, -119.776°, elevation 4,724 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.