Climate Overview
The climate in La Unión is warm and mild. The average annual temperature is 23°C and approximately 2156mm of precipitation falls per year. La Unión receives a notable amount of rainfall throughout the year, including during its driest month. La Unión is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: May, April, June. The coldest months are January, February, December, when temperatures can drop to 17°C.
Temperature
La Unión sees moderate temperature variation throughout the year, ranging from 17°C to 32°C. The warmest month is May, when average highs reach 32°C and the mean temperature sits around 26°C. January 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.
Precipitation
La Unión is a very wet location, receiving approximately 2156mm of precipitation annually, which averages out to around 180mm per month. The wettest month is June, averaging 314mm of rainfall. September and July also tend to see above-average precipitation. The driest month is April, with just 53mm. That's 262mm less than June, 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 5km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is April, averaging 6km/h, though still comfortable for most outdoor activities. The calmest conditions occur in September, with average winds dropping to 4km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 2km/h gap between the calmest and windiest months.
Seasons
87 days until Winter
It is currently autumn in La Unión, which began on September 23, 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 May at around 32°C, while the coldest stretch bottoms out in January near 17°C. Winter is next, beginning on December 21, 2026 (87 days from now).
Spring
Temperatures range from 19 to 32°C. Precipitation is moderate at around 276mm for the season, averaging 92mm per month. Winds are generally light, averaging 5km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 21 to 30°C. Rainfall is heavy, totalling around 844mm across the season with a monthly average of 281mm. Winds are generally light, averaging 5km/h. Light, breathable clothing is ideal. Perfect conditions for outdoor activities.
Autumn
Temperatures range from 19 to 30°C. Rainfall is heavy, totalling around 731mm across the season with a monthly average of 244mm. Winds are generally light, averaging 4km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 17 to 27°C. Rainfall is heavy, totalling around 305mm across the season with a monthly average of 102mm. Winds are generally light, averaging 5km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Best Time to Visit
The best time to visit La Unión is during January, February, March and April, when the weather is most comfortable for travellers. During these months, average temperatures hover around 23°C with modest rainfall averaging 73mm per month. By contrast, May can be uncomfortably hot with temperatures reaching 32°C. Despite being the best months overall, some rain is still likely. Pack a waterproof layer and plan a mix of indoor and outdoor activities.
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.
