Climate Overview
The climate in La Unión is hot. The average annual temperature is 28°C and approximately 1790mm of precipitation falls per year. October is the wettest month, receiving around 378mm of rainfall. La Unión is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, August, May. The coldest months are October, January, February, when temperatures can drop to 26°C.
Temperature
La Unión has relatively stable temperatures year-round, staying within a 5°C range. The warmest month is July, when average highs reach 31°C and the mean temperature sits around 29°C. October is the coolest month, with minimum temperatures around 26°C and an average of 27°C. Daily temperature variation is modest, with an average difference of 3°C between highs and lows.
Precipitation
La Unión is a fairly wet location, receiving approximately 1790mm of precipitation annually, which averages out to around 149mm per month. The wettest month is October, averaging 378mm of rainfall. June and September also tend to see above-average precipitation. The driest month is February, with just 1mm. That's 377mm less than October, 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
La Unión is moderately windy, with an average annual wind speed of 21km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is February, averaging 25km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in October, with average winds dropping to 17km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 8km/h gap between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 23km/h in winter, 23km/h in spring, 19km/h in summer, 17km/h in autumn.
Seasons
89 days until Summer
It is currently spring in La Unión, which began on March 20, 2026. 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 July at around 31°C, while the coldest stretch bottoms out in October near 26°C. Summer is next, beginning on June 21, 2026 — 89 days from now.
Spring
Temperatures range from 27 to 30°C. Precipitation is moderate at around 274mm for the season, averaging 91mm per month. Winds are moderate at around 23km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 27 to 31°C. Rainfall is heavy, totalling around 693mm across the season with a monthly average of 231mm. Winds are moderate at around 19km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 26 to 29°C. Rainfall is heavy, totalling around 814mm across the season with a monthly average of 271mm. Winds are moderate at around 17km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 26 to 30°C. Precipitation is minimal, with only around 9mm for the entire season. Winds are moderate at around 23km/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.
