Climate Overview
The climate in La Unión is temperate. The average annual temperature is 11°C and approximately 2390mm of precipitation falls per year. La Unión receives a notable amount of rainfall throughout the year, including during its driest month. La Unión sits near the equator, so seasonal temperature differences are minimal throughout the year.
Temperature
La Unión has relatively stable temperatures year-round, staying within a 10°C range. March is the warmest month, though highs remain moderate at 16°C with a mean of 12°C. August is the coolest month, with minimum temperatures around 6°C and an average of 10°C. Daily temperature variation is modest, with an average difference of 8°C between highs and lows.
Precipitation
La Unión is a very wet location, receiving approximately 2390mm of precipitation annually, which averages out to around 199mm per month. The wettest month is March, averaging 302mm of rainfall. February and December also tend to see above-average precipitation. The driest month is September, with just 79mm. That's 223mm less than March, the wettest month. Precipitation varies noticeably between seasons, with the first half (January to June) of the year generally seeing more rainfall.
Wind
La Unión is relatively calm, with an average annual wind speed of 6km/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 7km/h, though still comfortable for most outdoor activities. The calmest conditions occur in November, with average winds dropping to 5km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 2km/h between the calmest and windiest months.
Seasons
2 days until Spring
It is currently winter in La Unión, which began on June 21, 2026. La Unión sits near the equator, so the traditional four-season cycle is less pronounced. Temperatures remain relatively stable year-round. The warmest period peaks in March at around 16°C, while the coldest stretch bottoms out in August near 6°C. Spring is next, beginning on September 23, 2026 (2 days from now).
Spring
Temperatures range from 6 to 16°C. Rainfall is heavy, totalling around 483mm across the season with a monthly average of 161mm. Winds are generally light, averaging 6km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 8 to 16°C. Rainfall is heavy, totalling around 751mm across the season with a monthly average of 250mm. Winds are generally light, averaging 5km/h. Comfortable clothing with a light layer for cooler evenings is all you need.
Autumn
Temperatures range from 8 to 16°C. Rainfall is heavy, totalling around 743mm across the season with a monthly average of 248mm. Winds are generally light, averaging 5km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 6 to 14°C. Rainfall is heavy, totalling around 413mm across the season with a monthly average of 138mm. Winds are generally light, averaging 7km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Monthly Climate Data
The table below shows monthly climate averages for 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.
