Climate Overview
The climate in San Martin is warm and mild. The average annual temperature is 25°C and approximately 401mm of precipitation falls per year. March is the wettest month, receiving around 189mm of rainfall. San Martin sits near the equator, so seasonal temperature differences are minimal throughout the year.
Temperature
San Martin sees moderate temperature variation throughout the year, ranging from 17°C to 34°C. The warmest month is January, when average highs reach 34°C and the mean temperature sits around 27°C. August is the coolest month, with minimum temperatures around 17°C and an average of 22°C. On average, daily temperatures fluctuate by about 11°C between overnight lows and afternoon highs. The sharpest temperature change occurs between May and June, with a 2°C shift in average temperatures.
Precipitation
San Martin is a relatively dry area, receiving approximately 401mm of precipitation annually, which averages out to around 33mm per month. The wettest month is March, averaging 189mm of rainfall. February and April also tend to see above-average precipitation. The driest month is August, with just 1mm. That's 187mm less than March, 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 Martin is relatively calm, with an average annual wind speed of 3km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is September, averaging 3km/h, though still comfortable for most outdoor activities. The calmest conditions occur in March, 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
3 days until Winter
It is currently autumn in San Martin, which began on March 20, 2026. San Martin sits near the equator, so the traditional four-season cycle is less pronounced — temperatures remain relatively stable year-round. The warmest period peaks in January at around 34°C, while the coldest stretch bottoms out in August near 17°C. Winter is next, beginning on June 21, 2026 — 3 days from now.
Spring
Temperatures range from 18 to 30°C. Precipitation is minimal, with only around 14mm for the entire season. Winds are generally light, averaging 3km/h. Light layers work well as temperatures warm through the season — a great time to be outdoors.
Summer
Temperatures range from 20 to 34°C. Rainfall is relatively light, with around 149mm over the season and a monthly average of 50mm. Winds are generally light, averaging 2km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 21 to 34°C. Precipitation is moderate at around 232mm for the season, averaging 77mm 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 17 to 30°C. Precipitation is minimal, with only around 6mm for the entire season. Winds are generally light, averaging 3km/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 Martin is during June, July, August, September, October and November, when the weather is most comfortable for travellers. During these months, average temperatures hover around 23°C with modest rainfall averaging 3mm per month. By contrast, January can be uncomfortably hot with temperatures reaching 34°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.
Monthly Climate Data
The table below shows monthly climate averages for San Martin 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.
