Climate Insights for Boulder City

The climate in Boulder City is warm and mild. The average annual temperature is 22°C and approximately 144mm of precipitation falls per year. Gennaio is the wettest month, receiving around 28mm of rainfall. Boulder 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 Dicembre, Gennaio, Febbraio, when temperatures can drop to 5°C.

Boulder City has a wide annual temperature range, spanning 36°C from the coldest to warmest months. Luglio is the hottest month, with daytime highs reaching 41°C and an average of 35°C. Dicembre is the coolest month, with minimum temperatures around 5°C and an average of 10°C. On average, daily temperatures fluctuate by about 12°C between overnight lows and afternoon highs. The sharpest temperature change occurs between October and November, with a 8°C shift in average temperatures.

Boulder City is a quite dry location, receiving approximately 144mm of precipitation annually, which averages out to around 12mm per month. The wettest month is January, averaging 28mm of rainfall. February and March also tend to see above-average precipitation. The driest month is June, with just 1mm. That's 27mm less than January, 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.

Boulder City is mildly breezy, with an average annual wind speed of 15km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is May, averaging 18km/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 7km/h gap between the calmest and windiest months. Wind tends to pick up during the summer months. The seasonal averages are 12km/h in winter, 18km/h in spring, 17km/h in summer, 14km/h in autumn.

It is currently spring in Boulder City, which began on March 20, 2026. Boulder 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 41°C, while the coldest stretch bottoms out in Dicembre near 5°C. Summer is next, beginning on June 21, 2026 — 93 days from now.

The best time to visit Boulder City is during Marzo, Aprile and Ottobre, when the weather is most comfortable for travellers. During these months, average temperatures hover around 20°C with modest rainfall averaging 11mm per month. By contrast, Luglio can be uncomfortably hot with highs reaching 41°C, while Dicembre is the coldest period with lows dropping to 5°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Boulder 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. 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.