Climate Overview
The climate in La Unión is hot. The average annual temperature is 28°C and approximately 1528mm of precipitation falls per year. October is the wettest month, receiving around 383mm of rainfall. La Unión is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: March, July, April. The coldest months are December, January, November, when temperatures can drop to 24°C.
Temperature
La Unión has relatively stable temperatures year-round, staying within a 9°C range. The warmest month is March, when average highs reach 33°C and the mean temperature sits around 29°C. December is the coolest month, with minimum temperatures around 24°C and an average of 28°C. Daily temperature variation is modest, with an average difference of 7°C between highs and lows.
Precipitation
La Unión is a fairly wet location, receiving approximately 1528mm of precipitation annually, which averages out to around 127mm per month. The wettest month is October, averaging 383mm of rainfall. May and June also tend to see above-average precipitation. The driest month is February, with just 1mm. That's 382mm 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 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 February, averaging 3km/h, though still comfortable for most outdoor activities. The calmest conditions occur in October, 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
92 days until Autumn
It is currently summer in La Unión, which began on June 21, 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 March at around 33°C, while the coldest stretch bottoms out in December near 24°C. Autumn is next, beginning on September 23, 2026 — 92 days from now.
Spring
Temperatures range from 26 to 33°C. Precipitation is moderate at around 299mm for the season, averaging 100mm per month. Winds are generally light, averaging 3km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 25 to 33°C. Rainfall is heavy, totalling around 524mm across the season with a monthly average of 175mm. Winds are generally light, averaging 2km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 24 to 31°C. Rainfall is heavy, totalling around 696mm across the season with a monthly average of 232mm. Winds are generally light, averaging 2km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 24 to 33°C. Precipitation is minimal, with only around 9mm 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.
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.
