Climate Overview
The climate in San Borja is hot. The average annual temperature is 26°C and approximately 2176mm of precipitation falls per year. San Borja receives a notable amount of rainfall throughout the year, including during its driest month. San Borja is in the Southern Hemisphere. The seasons are reversed — summer runs from December to February, while winter falls between June and August. The summer months are: September, October, November. The coldest months are July, June, August, when temperatures can drop to 18°C.
Temperature
San Borja sees moderate temperature variation throughout the year, ranging from 18°C to 34°C. The warmest month is September, when average highs reach 34°C and the mean temperature sits around 27°C. July is the coolest month, with minimum temperatures around 18°C and an average of 23°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs. The sharpest temperature change occurs between August and September, with a 2°C shift in average temperatures.
Precipitation
San Borja is a very wet location, receiving approximately 2176mm of precipitation annually, which averages out to around 181mm per month. The wettest month is December, averaging 405mm of rainfall. January and February also tend to see above-average precipitation. The driest month is July, with just 43mm. That's 362mm less than December, 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 Borja 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 October, averaging 2km/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. Wind conditions are fairly consistent throughout the year, varying by only 0km/h between the calmest and windiest months.
Seasons
92 days until Spring
It is currently winter in San Borja, which began on June 21, 2026. San Borja is in the Southern Hemisphere, where the seasons are reversed — spring starts in September, summer in December, autumn in March, and winter in June. The warmest period peaks in September at around 34°C, while the coldest stretch bottoms out in July near 18°C. Spring is next, beginning on September 23, 2026 — 92 days from now.
Spring
Temperatures range from 21 to 34°C. Rainfall is heavy, totalling around 463mm across the season with a monthly average of 154mm. Winds are generally light, averaging 2km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 23 to 31°C. Rainfall is heavy, totalling around 1011mm across the season with a monthly average of 337mm. Winds are generally light, averaging 2km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 20 to 31°C. Rainfall is heavy, totalling around 533mm across the season with a monthly average of 178mm. Winds are generally light, averaging 2km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 18 to 32°C. Precipitation is moderate at around 169mm for the season, averaging 56mm per month. 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 Borja is during May, June, July and August, when the weather is most comfortable for travellers. During these months, average temperatures hover around 23°C with modest rainfall averaging 65mm per month. By contrast, September 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 Borja 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.
