Climate Insights for La Unión

The climate in La Unión is warm and mild. The average annual temperature is 19°C and approximately 301mm of precipitation falls per year. March is the wettest month, receiving around 50mm of rainfall. La Unión is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, September. The coldest months are January, February, March, when temperatures can drop to 13°C.

La Unión sees moderate temperature variation throughout the year, ranging from 13°C to 27°C. The warmest month is August, when average highs reach 27°C and the mean temperature sits around 26°C. January is the coolest month, with minimum temperatures around 13°C and an average of 14°C. Daily temperature variation is modest, with an average difference of 2°C between highs and lows. The sharpest temperature change occurs between October and November, with a 4°C shift in average temperatures.

La Unión is a quite dry location, receiving approximately 301mm of precipitation annually, which averages out to around 25mm per month. The wettest month is March, averaging 50mm of rainfall. December and September also tend to see above-average precipitation. The driest month is July, with just 1mm. That's 49mm less than March, 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.

La Unión is mildly breezy, with an average annual wind speed of 17km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is March, averaging 21km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in July, with average winds dropping to 16km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 5km/h 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 18km/h in winter, 19km/h in spring, 16km/h in summer, 17km/h in 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 August at around 27°C, while the coldest stretch bottoms out in January near 13°C. Autumn is next, beginning on September 23, 2026 (7 days from now).

The best time to visit La Unión is during April, May, June, July, September, October and November, when the weather is most comfortable for travellers. During these months, average temperatures hover around 21°C with modest rainfall averaging 23mm per month. By contrast, August can be uncomfortably hot with highs reaching 27°C, while January is the coldest period with lows dropping to 13°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

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.