Climate Overview
The climate in San Carlos is warm and mild. The average annual temperature is 23°C and approximately 1002mm of precipitation falls per year. September is the wettest month, receiving around 219mm of rainfall. San Carlos is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, June. The coldest months are January, February, December, when temperatures can drop to 11°C.
Temperature
Temperatures in San Carlos vary considerably across the year, with a 23°C difference between the coldest and warmest months. The warmest month is August, when average highs reach 34°C and the mean temperature sits around 28°C. January is the coolest month, with minimum temperatures around 11°C and an average of 15°C. On average, daily temperatures fluctuate by about 11°C between overnight lows and afternoon highs. The sharpest temperature change occurs between October and November, with a 4°C shift in average temperatures.
Precipitation
San Carlos is a moderately rainy area, receiving approximately 1002mm of precipitation annually, which averages out to around 84mm per month. The wettest month is September, averaging 219mm of rainfall. June and July also tend to see above-average precipitation. The driest month is December, with just 14mm. That's 204mm 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 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 March, averaging 18km/h, though still comfortable for most outdoor activities. The calmest conditions occur in September, with average winds dropping to 14km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 4km/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 August at around 34°C, while the coldest stretch bottoms out in January near 11°C. Summer is next, beginning on June 21, 2026 — 81 days from now.
Spring
Temperatures range from 16 to 33°C. Precipitation is moderate at around 184mm for the season, averaging 61mm per month. Winds are moderate at around 18km/h. Light layers work well as temperatures warm through the season — a great time to be outdoors.
Summer
Temperatures range from 23 to 34°C. Rainfall is heavy, totalling around 397mm across the season with a monthly average of 132mm. Winds are moderate at around 17km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 15 to 31°C. Rainfall is heavy, totalling around 377mm across the season with a monthly average of 126mm. Winds are generally light, averaging 14km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 11 to 25°C. Precipitation is minimal, with only around 45mm for the entire season. Winds are moderate at around 17km/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 January, February, March, April, November and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 19°C with modest rainfall averaging 33mm per month. By contrast, August can be uncomfortably hot with temperatures reaching 34°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.
