Climate Overview
The climate in San Francisco la Unión is temperate. The average annual temperature is 15°C and approximately 1972mm of precipitation falls per year. June is the wettest month, receiving around 388mm of rainfall. San Francisco la Unión is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: April, May, March. The coldest months are January, February, December, when temperatures can drop to 9°C.
Temperature
San Francisco la Unión sees moderate temperature variation throughout the year, ranging from 9°C to 23°C. April is the warmest month, though highs remain moderate at 23°C with a mean of 17°C. January is the coolest month, with minimum temperatures around 9°C and an average of 14°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs.
Precipitation
San Francisco la Unión is a fairly wet location, receiving approximately 1972mm of precipitation annually, which averages out to around 164mm per month. The wettest month is June, averaging 388mm of rainfall. September and October also tend to see above-average precipitation. The driest month is February, with just 21mm. That's 367mm less than June, 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 Francisco la Unión is relatively calm, with an average annual wind speed of 5km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is July, averaging 6km/h, though still comfortable for most outdoor activities. The calmest conditions occur in May, with average winds dropping to 4km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 2km/h gap between the calmest and windiest months.
Seasons
87 days until Winter
It is currently autumn in San Francisco la Unión, which began on September 23, 2026. San Francisco la Unión 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 April at around 23°C, while the coldest stretch bottoms out in January near 9°C. Winter is next, beginning on December 21, 2026 (87 days from now).
Spring
Temperatures range from 10 to 23°C. Rainfall is heavy, totalling around 389mm across the season with a monthly average of 130mm. Winds are generally light, averaging 5km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 12 to 21°C. Rainfall is heavy, totalling around 824mm across the season with a monthly average of 275mm. Winds are generally light, averaging 5km/h. Comfortable clothing with a light layer for cooler evenings is all you need.
Autumn
Temperatures range from 11 to 21°C. Rainfall is heavy, totalling around 679mm across the season with a monthly average of 226mm. Winds are generally light, averaging 4km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 9 to 21°C. Rainfall is relatively light, with around 81mm over the season and a monthly average of 27mm. Winds are generally light, averaging 6km/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 Francisco la Unión is during March and April, when the weather is most comfortable for travellers. During these months, average temperatures hover around 16°C with modest rainfall averaging 71mm per month. By contrast, January can be quite cold with temperatures dropping to 9°C. Despite being the best months overall, some rain is still likely. Pack a waterproof layer and plan a mix of indoor and outdoor activities.
Monthly Climate Data
The table below shows monthly climate averages for San Francisco la Unión 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.
