When to go · Sun Valley
Sun Valley, month by month
The best months for Sun Valley: Jan, Feb, Mar, Jul, Aug, Sep. Months to avoid: Apr, May, Nov.
Month by month
- JanuaryGreatInside Sun Valley's best window: Jan–Mar (ski), Jul–Sep (hike, bike, fish).0 °C (32 °F) / -12 °C (10 °F), 9 rain days32 °F (0 °C) / 10 °F (-12 °C), 9 rain daysCrowds: Low
- FebruaryGreatInside Sun Valley's best window: Jan–Mar (ski), Jul–Sep (hike, bike, fish).3 °C (37 °F) / -10 °C (14 °F), 8 rain days37 °F (3 °C) / 14 °F (-10 °C), 8 rain daysCrowds: Low · 1 festival or holiday
- MarchGreatInside Sun Valley's best window: Jan–Mar (ski), Jul–Sep (hike, bike, fish).8 °C (46 °F) / -6 °C (21 °F), 8 rain days46 °F (8 °C) / 21 °F (-6 °C), 8 rain daysCrowds: Medium · 2 festivals or holidays
- AprilAvoidListed as a month to avoid: Apr–May and Nov (mud season, lifts and trails closed).13 °C (55 °F) / -2 °C (28 °F), 7 rain days55 °F (13 °C) / 28 °F (-2 °C), 7 rain daysCrowds: Medium · 1 festival or holiday
- MayAvoidListed as a month to avoid: Apr–May and Nov (mud season, lifts and trails closed).18 °C (64 °F) / 2 °C (36 °F), 8 rain days64 °F (18 °C) / 36 °F (2 °C), 8 rain daysCrowds: Medium · 1 festival or holiday
- JuneGoodOutside the best window (Jan–Mar (ski), Jul–Sep (hike, bike, fish)). Across United States: Rockies and northern parks open; desert heat builds; hurricane season starts. Book parks months ahead.24 °C (75 °F) / 6 °C (43 °F), 6 rain days75 °F (24 °C) / 43 °F (6 °C), 6 rain daysCrowds: High
- JulyGreatInside Sun Valley's best window: Jan–Mar (ski), Jul–Sep (hike, bike, fish).29 °C (84 °F) / 9 °C (48 °F), 4 rain days84 °F (29 °C) / 48 °F (9 °C), 4 rain daysCrowds: High · 1 festival or holiday
- AugustGreatInside Sun Valley's best window: Jan–Mar (ski), Jul–Sep (hike, bike, fish).29 °C (84 °F) / 9 °C (48 °F), 4 rain days84 °F (29 °C) / 48 °F (9 °C), 4 rain daysCrowds: High
- SeptemberGreatInside Sun Valley's best window: Jan–Mar (ski), Jul–Sep (hike, bike, fish).23 °C (73 °F) / 4 °C (39 °F), 5 rain days73 °F (23 °C) / 39 °F (4 °C), 5 rain daysCrowds: Medium · 1 festival or holiday
- OctoberGoodOutside the best window (Jan–Mar (ski), Jul–Sep (hike, bike, fish)). Across United States: Best all-round month: New England foliage, desert parks, cooler cities. High roads start closing late in the month.15 °C (59 °F) / -1 °C (30 °F), 6 rain days59 °F (15 °C) / 30 °F (-1 °C), 6 rain daysCrowds: Medium
- NovemberAvoidListed as a month to avoid: Apr–May and Nov (mud season, lifts and trails closed).5 °C (41 °F) / -7 °C (19 °F), 8 rain days41 °F (5 °C) / 19 °F (-7 °C), 8 rain daysCrowds: Medium · 1 festival or holiday
- DecemberMixedOutside the best window (Jan–Mar (ski), Jul–Sep (hike, bike, fish)). Across United States: Holiday lights in New York, ski season opens; flights and hotels peak around Christmas and New Year.0 °C (32 °F) / -12 °C (10 °F), 9 rain days32 °F (0 °C) / 10 °F (-12 °C), 9 rain daysCrowds: High · 1 festival or holiday
Compare two months
Weather, crowds and prices for any two months in Sun Valley, side by side.
Verdict
Jan: Great
Feb: Great
Daytime high
Jan: 0 °C (32 °F)32 °F (0 °C)
Feb: 3 °C (37 °F)37 °F (3 °C)
Night low
Jan: -12 °C (10 °F)10 °F (-12 °C)
Feb: -10 °C (14 °F)14 °F (-10 °C)
Rain days
Jan: 9
Feb: 8 (better)
Crowds
Jan: Low
Feb: Low
Prices
Jan: Low
Feb: Medium
Festivals listed
Jan: 0
Feb: 1
January: Inside Sun Valley's best window: Jan–Mar (ski), Jul–Sep (hike, bike, fish).
February: Inside Sun Valley's best window: Jan–Mar (ski), Jul–Sep (hike, bike, fish).
Sun Valley: figures are long-term averages from this guide, not a forecast.