Climate Overview
The climate in San Rafael is temperate. The average annual temperature is 16°C and approximately 408mm of precipitation falls per year. September is the wettest month, receiving around 67mm of rainfall. San Rafael is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: May, June, August. The coldest months are January, December, February, when temperatures can drop to 5°C.
Temperature
Temperatures in San Rafael vary considerably across the year, with a 22°C difference between the coldest and warmest months. The warmest month is May, when average highs reach 27°C and the mean temperature sits around 20°C. January is the coolest month, with minimum temperatures around 5°C and an average of 10°C. On average, daily temperatures fluctuate by about 13°C between overnight lows and afternoon highs. The sharpest temperature change occurs between January and February, with a 3°C shift in average temperatures.
Precipitation
San Rafael is a relatively dry area, receiving approximately 408mm of precipitation annually, which averages out to around 34mm per month. The wettest month is September, averaging 67mm of rainfall. July and June also tend to see above-average precipitation. The driest month is December, with just 11mm. That's 56mm less than September, 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 Rafael is mildly breezy, with an average annual wind speed of 13km/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 16km/h, though still comfortable for most outdoor activities. The calmest conditions occur in September, with average winds dropping to 11km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 5km/h between the calmest and windiest months.
Seasons
82 days until Summer
It is currently spring in San Rafael, which began on March 20, 2026. San Rafael 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 27°C, while the coldest stretch bottoms out in January near 5°C. Summer is next, beginning on June 21, 2026 — 82 days from now.
Spring
Temperatures range from 9 to 27°C. Rainfall is relatively light, with around 99mm over the season and a monthly average of 33mm. Winds are generally light, averaging 15km/h. Light layers work well as temperatures warm through the season — a great time to be outdoors.
Summer
Temperatures range from 14 to 27°C. Precipitation is moderate at around 155mm for the season, averaging 52mm per month. Winds are generally light, averaging 13km/h. Comfortable clothing with a light layer for cooler evenings is all you need.
Autumn
Temperatures range from 9 to 25°C. Rainfall is relatively light, with around 114mm over the season and a monthly average of 38mm. Winds are generally light, averaging 11km/h. Layered clothing works best as temperatures gradually cool — enjoy the crisp air and changing scenery.
Winter
Temperatures range from 5 to 21°C. Precipitation is minimal, with only around 40mm for the entire season. Winds are generally light, averaging 14km/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 Rafael is during March, April, May, June, July, August, September and October, when the weather is most comfortable for travellers. During these months, average temperatures hover around 18°C with modest rainfall averaging 44mm per month. By contrast, January can be quite cold with temperatures 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 Rafael 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.
