Climate Insights for Boise

The climate in Boise is temperate. The average annual temperature is 11°C and approximately 442mm of precipitation falls per year. Dicembre is the wettest month, receiving around 67mm of rainfall. Boise is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: Luglio, Agosto, Giugno. The coldest months are Gennaio, Dicembre, Febbraio, when temperatures can drop to -4°C. Snowfall occurs from January to December, with around 76cm accumulating over the season.

Boise has a wide annual temperature range, spanning 37°C from the coldest to warmest months. The warmest month is Luglio, when average highs reach 33°C and the mean temperature sits around 25°C. The coldest month is Gennaio, when overnight lows fall to -4°C and the daily average is -1°C. On average, daily temperatures fluctuate by about 13°C between overnight lows and afternoon highs. The sharpest temperature change occurs between September and October, with a 7°C shift in average temperatures.

Boise is a relatively dry area, receiving approximately 442mm of precipitation annually, which averages out to around 37mm per month. The wettest month is December, averaging 67mm of rainfall. January and March also tend to see above-average precipitation. The driest month is July, with just 3mm. That's 65mm less than December, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic. Snowfall is a regular feature from January to December, with around 76cm accumulating over the season. December typically sees the most snow at around 23cm.

Boise is mildly breezy, with an average annual wind speed of 13km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is April, averaging 17km/h, though still comfortable for most outdoor activities. The calmest conditions occur in December, with average winds dropping to 11km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 6km/h gap between the calmest and windiest months.

It is currently winter in Boise, which began on December 21, 2026. Boise is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in Luglio at around 33°C, while the coldest stretch bottoms out in Gennaio near -4°C. Spring is next, beginning on March 20, 2026 — 1 days from now.

The best time to visit Boise is during Giugno, Luglio, Agosto and Settembre, when the weather is most comfortable for travellers. During these months, average temperatures hover around 21°C with modest rainfall averaging 12mm per month. By contrast, Gennaio can be quite cold with temperatures dropping to -4°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Boise based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.