Boise (ID), United States of America - Weather and Climate
Boise is the capital of the U.S. state of Idaho and is gaining attention for its vibrant cultural scene. It has a cold steppe climate, with an average annual precipitation of nearly 326 mm. Winters are quite cool, gloomy, and somewhat humid. The summer months, on the other hand, are warm, very sunny, and dry. During July and August, rain is rare, while the sun shines abundantly. July alone records up to 400 hours of sunshine (long-term average), contributing significantly to the annual total of nearly three thousand hours.
Average maximum day and minimum night temperature
Visitors to Boise can expect significant temperature changes throughout the year. Average maximum daytime temperatures range from a very warm 34°C in July, the warmest time of the year, to a chilly 4°C during cooler months like January.
At night, temperatures typically drop to an average of around -5°C during these months.Check out our detailed temperature page for more information.
Temperature ranges by month
Precipitation and rainy days
Boise tends toward drier weather patterns, receiving approximately 326 mm of rain/snow per year. Significant seasonal changes in precipitation occur throughout the year. During the wetter season, December receives moderate snow/rainfall, averaging 49 mm of precipitation, recorded across 14 snowy/rainy days. In contrast, the drier season, August brings less rainfall, with 8.3 mm over 4 rainy days. For more details, please visit our Boise Precipitation page.
The mean monthly precipitation over the year, including rain, hail and snow
The average number of days each month with precipitation
Sunshine over the year
Seasonal changes in sunshine hours are quite dramatic in Boise. While July receives considerable daily sunshine with up to 13.3 hours, December marks the darkest time of the year, where sunshine is scarce with only 3.4 hours of sunlight per day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Average humidity
The relative humidity is moderate throughout the year in Boise.
The city experiences its highest humidity in January, reaching 75%. In July, the humidity drops to its lowest level at 36%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Forecast for Boise (ID)
Select a Month of Interest
Check the conditions for any month of the year.
The best time of year to visit Boise in the United States of America
Other facts from our historical weather data:The hottest season / summer takes place in June, July, August and September.
Yes, the months of July, August and September are very dry.
July has an average maximum temperature of 34°C and is the warmest month of the year.
The coldest month is January with an average maximum temperature of 4°C.
December tops the wettest month list with 49 mm of rainfall.
August is the driest month with 8 mm of precipitation.
July is the sunniest month with an average of 399 hours of sunshine.
No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.
