Climate Overview
The climate in San Juan del Río is temperate. The average annual temperature is 16°C and approximately 1081mm of precipitation falls per year. August is the wettest month, receiving around 200mm of rainfall. San Juan del Río is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: May, April, March. The coldest months are January, February, December, when temperatures can drop to 5°C.
Temperature
Temperatures in San Juan del Río vary considerably across the year, with a 23°C difference between the coldest and warmest months. The warmest month is May, when average highs reach 28°C and the mean temperature sits around 20°C. January is the coolest month, with minimum temperatures around 5°C and an average of 12°C. On average, daily temperatures fluctuate by about 13°C between overnight lows and afternoon highs. The sharpest temperature change occurs between March and April, with a 3°C shift in average temperatures.
Precipitation
San Juan del Río is a moderately rainy area, receiving approximately 1081mm of precipitation annually, which averages out to around 90mm per month. The wettest month is August, averaging 200mm of rainfall. July and June also tend to see above-average precipitation. The driest month is December, with just 10mm. That's 190mm 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.
Wind
San Juan del Río is relatively calm, with an average annual wind speed of 2km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is March, averaging 3km/h, though still comfortable for most outdoor activities. The calmest conditions occur in June, with average winds dropping to 2km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 1km/h gap between the calmest and windiest months.
Seasons
63 days until Autumn
It is currently summer in San Juan del Río, which began on June 21, 2026. San Juan del Río 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 May at around 28°C, while the coldest stretch bottoms out in January near 5°C. Autumn is next, beginning on September 23, 2026 — 63 days from now.
Spring
Temperatures range from 9 to 28°C. Precipitation is moderate at around 205mm for the season, averaging 68mm per month. Winds are generally light, averaging 2km/h. Light layers work well as temperatures warm through the season — a great time to be outdoors.
Summer
Temperatures range from 13 to 23°C. Rainfall is heavy, totalling around 593mm across the season with a monthly average of 198mm. Winds are generally light, averaging 2km/h. Comfortable clothing with a light layer for cooler evenings is all you need.
Autumn
Temperatures range from 9 to 22°C. Precipitation is moderate at around 244mm for the season, averaging 81mm per month. Winds are generally light, averaging 2km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 5 to 23°C. Precipitation is minimal, with only around 39mm for the entire season. Winds are generally light, averaging 2km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Best Time to Visit
The best time to visit San Juan del Río is during March, April and October, when the weather is most comfortable for travellers. During these months, average temperatures hover around 16°C with modest rainfall averaging 33mm per month. By contrast, May can be uncomfortably hot with highs reaching 28°C, while January is the coldest period with lows dropping to 5°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.
Monthly Climate Data
The table below shows monthly climate averages for San Juan del Río 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.