Climate Overview
The climate in San Carlos is warm and mild. The average annual temperature is 23°C and approximately 509mm of precipitation falls per year. September is the wettest month, receiving around 87mm of rainfall. San Carlos 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 January, December, February, when temperatures can drop to 7°C.
Temperature
Temperatures in San Carlos vary considerably across the year, with a 30°C difference between the coldest and warmest months. July is the hottest month, with daytime highs reaching 37°C and an average of 31°C. January is the coolest month, with minimum temperatures around 7°C and an average of 12°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 6°C shift in average temperatures.
Precipitation
San Carlos is a relatively dry area, receiving approximately 509mm of precipitation annually, which averages out to around 42mm per month. The wettest month is September, averaging 87mm of rainfall. May and October also tend to see above-average precipitation. The driest month is January, with just 15mm. That's 72mm 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 Carlos is moderately windy, with an average annual wind speed of 22km/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 25km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in September, with average winds dropping to 19km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 6km/h between the calmest and windiest months.
Seasons
81 days until Summer
It is currently spring in San Carlos, which began on March 20, 2026. San Carlos 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 37°C, while the coldest stretch bottoms out in January near 7°C. Summer is next, beginning on June 21, 2026 — 81 days from now.
Spring
Temperatures range from 14 to 33°C. Precipitation is moderate at around 163mm for the season, averaging 54mm per month. Winds are moderate at around 24km/h. Light layers work well as temperatures warm through the season — a great time to be outdoors.
Summer
Temperatures range from 25 to 37°C. Rainfall is relatively light, with around 121mm over the season and a monthly average of 40mm. Winds are moderate at around 22km/h. Stay hydrated, wear sun protection, and seek shade during the hottest hours of the day.
Autumn
Temperatures range from 13 to 34°C. Precipitation is moderate at around 172mm for the season, averaging 57mm per month. Winds are moderate at around 20km/h. Layered clothing works best as temperatures gradually cool — enjoy the crisp air and changing scenery.
Winter
Temperatures range from 7 to 23°C. Rainfall is relatively light, with around 54mm over the season and a monthly average of 18mm. Winds are moderate at around 21km/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 Carlos is during March, April, October and November, when the weather is most comfortable for travellers. During these months, average temperatures hover around 21°C with modest rainfall averaging 41mm per month. By contrast, July can be uncomfortably hot with highs reaching 37°C, while January is the coldest period with lows dropping to 7°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 Carlos 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.
