Climate Insights for La Unión

The climate in La Unión is warm and mild. The average annual temperature is 24°C and approximately 317mm of precipitation falls per year. March is the wettest month, receiving around 138mm of rainfall. La Unión sits near the equator, so seasonal temperature differences are minimal throughout the year.

La Unión sees moderate temperature variation throughout the year, ranging from 17°C to 32°C. The warmest month is February, when average highs reach 32°C and the mean temperature sits around 27°C. August is the coolest month, with minimum temperatures around 17°C and an average of 21°C. On average, daily temperatures fluctuate by about 9°C between overnight lows and afternoon highs. The sharpest temperature change occurs between November and December, with a 2°C shift in average temperatures.

La Unión is a quite dry location, receiving approximately 317mm of precipitation annually, which averages out to around 26mm per month. The wettest month is March, averaging 138mm of rainfall. April and February also tend to see above-average precipitation. The driest month is September, with just 1mm. That's 136mm 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 moderately windy, with an average annual wind speed of 20km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is January, averaging 22km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in March, with average winds dropping to 18km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 4km/h between the calmest and windiest months.

It is currently autumn in La Unión, which began on March 20, 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 February at around 32°C, while the coldest stretch bottoms out in August near 17°C. Winter is next, beginning on June 21, 2026 — 89 days from now.

The best time to visit La Unión is during May, June, July, August, September, October, November and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 22°C with modest rainfall averaging 8mm per month. By contrast, February can be uncomfortably hot with temperatures reaching 32°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.