Best Time to Visit Sun Valley for Hiking | Weather by Month

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Outdoor activities Potential

88/100

Excellent

Based on optimal climate

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Seasonality

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Best Time

July, August, September

Avoid

Avoid (Extreme Weather)

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Weather

-6°C – 16°C

Avg Temp Range

Precipitation

Generally dry

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Good For

ac_unitWinter Sports

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🥾 Planning a hiking trip to Sun Valley?

The best time to visit Sun Valley for hiking is July, August, September, when trail conditions are most favorable and the weather is more stable. If you're planning your trip around this period, it can be helpful to look into where to stay and how to organize your hikes in advance.

→ Explore places to stay near hiking areas in Sun Valley

→ Discover hiking routes and experiences in Sun Valley

Climate Heatmap

See at a glance which months offer the best outdoor activities conditions — based on temperature, rainfall and climate scores.

Summer offers the most reliable hiking conditions in Sun Valley, with open trails and longer daylight hours.

→ See where to stay in Sun Valley

Outdoor activities conditions breakdown

Monthly weather & climate data for Sun Valley

Month	Climate Score	Predictability	Avg Temp	Max Temp	Rain (mm)	Rain Days	Humidity	Season
January	38Poor Cool temperatures. Some rain conditions.	Predictability 85Weather conditions are fairly consistent throughout the year.	-6°	-1°	65	12.2	63%	shoulder
February	39Poor Cool temperatures. Mostly dry conditions.	Predictability 100Weather conditions are fairly consistent throughout the year.	-5°	1°	46	11.7	63%	dry
March	38Poor Cool temperatures. Mostly dry conditions.	Predictability 85Weather conditions are fairly consistent throughout the year.	-2°	4°	42	12.7	59%	dry
April	40Poor Cool temperatures. Mostly dry conditions.	Predictability 100Weather conditions are fairly consistent throughout the year.	2°	8°	38	11.2	53%	dry
May	43Poor Cool temperatures. Mostly dry conditions.	Predictability 100Weather conditions are fairly consistent throughout the year.	6°	14°	50	10.9	47%	dry
June	70Good Cool temperatures. Mostly dry conditions.	Predictability 100Weather conditions are fairly consistent throughout the year.	11°	19°	40	8.7	45%	dry
July	88Excellent Mild temperatures. Mostly dry conditions.	Predictability 100Weather conditions are fairly consistent throughout the year.	16°	25°	16	5.4	32%	dry
August	87Excellent Mild temperatures. Mostly dry conditions.	Predictability 60Weather conditions vary somewhat by season.	15°	24°	16	5.4	28%	dry
September	77Good Cool temperatures. Mostly dry conditions.	Predictability 60Weather conditions vary somewhat by season.	11°	19°	20	6	32%	dry
October	46Poor Cool temperatures. Mostly dry conditions.	Predictability 60Weather conditions vary somewhat by season.	5°	12°	34	7.1	43%	dry
November	41Poor Cool temperatures. Mostly dry conditions.	Predictability 100Weather conditions are fairly consistent throughout the year.	-3°	3°	38	10.5	62%	dry
December	36Poor Cool temperatures. Some rain conditions.	Predictability 85Weather conditions are fairly consistent throughout the year.	-6°	-1°	71	13.2	60%	shoulder