Climate Insights for Hermosillo

The climate in Hermosillo is warm and mild. The average annual temperature is 25°C and approximately 203mm of precipitation falls per year. August is the wettest month, receiving around 50mm of rainfall. Hermosillo is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: June, July, August. The coldest months are January, December, February, when temperatures can drop to 9°C.

Temperatures in Hermosillo vary considerably across the year, with a 31°C difference between the coldest and warmest months. June is the hottest month, with daytime highs reaching 40°C and an average of 32°C. January is the coolest month, with minimum temperatures around 9°C and an average of 16°C. On average, daily temperatures fluctuate by about 15°C between overnight lows and afternoon highs. The sharpest temperature change occurs between October and November, with a 6°C shift in average temperatures.

Hermosillo is a quite dry location, receiving approximately 203mm of precipitation annually, which averages out to around 17mm per month. The wettest month is August, averaging 50mm of rainfall. September and July also tend to see above-average precipitation. The driest month is May, with just 0mm. That's 50mm less than August, 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.

Hermosillo is mildly breezy, with an average annual wind speed of 17km/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 20km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in December, with average winds dropping to 13km/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 15km/h in winter, 19km/h in spring, 18km/h in summer, 15km/h in autumn.

It is currently spring in Hermosillo, which began on March 20, 2026. Hermosillo 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 June at around 40°C, while the coldest stretch bottoms out in January near 9°C. Summer is next, beginning on June 21, 2026 — 89 days from now.

The best time to visit Hermosillo is during January, February, March, April, November and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 20°C with modest rainfall averaging 9mm per month. By contrast, June can be uncomfortably hot with temperatures reaching 40°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Hermosillo 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.