Climate Insights for Boise City

The climate in Boise City is temperate. The average annual temperature is 14°C and approximately 420mm of precipitation falls per year. Maggio is the wettest month, receiving around 66mm of rainfall. Boise City 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, Febbraio, Dicembre, when temperatures can drop to -3°C. Light snow can occur between January and December.

Boise City has a wide annual temperature range, spanning 37°C from the coldest to warmest months. The warmest month is Luglio, when average highs reach 34°C and the mean temperature sits around 26°C. The coldest month is Gennaio, when overnight lows fall to -3°C and the daily average is 2°C. On average, daily temperatures fluctuate by about 15°C between overnight lows and afternoon highs. The sharpest temperature change occurs between September and October, with a 8°C shift in average temperatures.

Boise City is a relatively dry area, receiving approximately 420mm of precipitation annually, which averages out to around 35mm per month. The wettest month is May, averaging 66mm of rainfall. July and August also tend to see above-average precipitation. The driest month is February, with just 13mm. That's 53mm less than May, 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. Light snowfall can occur between January and December, totalling around 36cm annually. January is the snowiest month with approximately 8cm.

Boise City is moderately windy, with an average annual wind speed of 26km/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 30km/h, which can feel quite blustery and may affect outdoor activities. The calmest conditions occur in August, with average winds dropping to 23km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 7km/h between the calmest and windiest months.

It is currently winter in Boise City, which began on December 21, 2026. Boise City 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 34°C, while the coldest stretch bottoms out in Gennaio near -3°C. Spring is next, beginning on March 20, 2026 — 1 days from now.

The best time to visit Boise City is during Maggio, Giugno, Agosto and Settembre, when the weather is most comfortable for travellers. During these months, average temperatures hover around 22°C with modest rainfall averaging 49mm per month. By contrast, Luglio can be uncomfortably hot with highs reaching 34°C, while Gennaio is the coldest period with lows dropping to -3°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Boise City 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.