Climate Insights for Barstow

The climate in Barstow is warm and mild. The average annual temperature is 19°C and approximately 107mm of precipitation falls per year. January is the wettest month, receiving around 24mm of rainfall. Barstow is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, August, June. The coldest months are December, January, February, when temperatures can drop to 3°C.

Barstow has a wide annual temperature range, spanning 36°C from the coldest to warmest months. July is the hottest month, with daytime highs reaching 39°C and an average of 32°C. December is the coolest month, with minimum temperatures around 3°C and an average of 9°C. On average, daily temperatures fluctuate by about 14°C between overnight lows and afternoon highs. The sharpest temperature change occurs between October and November, with a 7°C shift in average temperatures.

Barstow is a quite dry location, receiving approximately 107mm of precipitation annually, which averages out to around 9mm per month. The wettest month is January, averaging 24mm of rainfall. March and February also tend to see above-average precipitation. The driest month is June, with just 1mm. That's 23mm 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.

Barstow is mildly breezy, with an average annual wind speed of 12km/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 17km/h, though still comfortable for most outdoor activities. The calmest conditions occur in December, with average winds dropping to 8km/h, making it an ideal period for wind-sensitive activities. Wind speeds vary significantly across the year, with a 9km/h difference between the calmest and windiest months. This level of variation is worth factoring into travel plans. Wind tends to pick up during the summer months. The seasonal averages are 10km/h in winter, 16km/h in spring, 14km/h in summer, 10km/h in autumn.

It is currently summer in Barstow, which began on June 21, 2026. Barstow 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 July at around 39°C, while the coldest stretch bottoms out in December near 3°C. Autumn is next, beginning on September 23, 2026 (7 days from now).

The best time to visit Barstow is during April, May and October, when the weather is most comfortable for travellers. During these months, average temperatures hover around 20°C with modest rainfall averaging 4mm per month. By contrast, July can be uncomfortably hot with highs reaching 39°C, while December is the coldest period with lows dropping to 3°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Barstow 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.