Climate Overview
The climate in La Unión is hot. The average annual temperature is 26°C and approximately 942mm of precipitation falls per year. September is the wettest month, receiving around 253mm 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, May, August. The coldest months are February, January, March, when temperatures can drop to 20°C.
Temperature
La Unión sees moderate temperature variation throughout the year, ranging from 20°C to 32°C. The warmest month is July, when average highs reach 32°C and the mean temperature sits around 27°C. February is the coolest month, with minimum temperatures around 20°C and an average of 24°C. Daily temperature variation is modest, with an average difference of 8°C between highs and lows.
Precipitation
La Unión is a moderately rainy area, receiving approximately 942mm of precipitation annually, which averages out to around 79mm per month. The wettest month is September, averaging 253mm of rainfall. October and August also tend to see above-average precipitation. The driest month is April, with just 0mm. That's 253mm less than September, 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 mildly breezy, with an average annual wind speed of 14km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is May, averaging 16km/h, though still comfortable for most outdoor activities. The calmest conditions occur in October, with average winds dropping to 11km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 5km/h gap between the calmest and windiest months.
Seasons
85 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 32°C, while the coldest stretch bottoms out in February near 20°C. Summer is next, beginning on June 21, 2026 — 85 days from now.
Spring
Temperatures range from 20 to 31°C. Precipitation is minimal, with only around 24mm for the entire season. Winds are moderate at around 16km/h. Light layers work well as temperatures warm through the season — a great time to be outdoors.
Summer
Temperatures range from 24 to 32°C. Rainfall is heavy, totalling around 418mm across the season with a monthly average of 139mm. Winds are generally light, averaging 13km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 22 to 30°C. Rainfall is heavy, totalling around 487mm across the season with a monthly average of 162mm. Winds are generally light, averaging 12km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 20 to 30°C. Precipitation is minimal, with only around 13mm for the entire season. Winds are generally light, averaging 13km/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, April and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 24°C with modest rainfall averaging 6mm per month. By contrast, July can be uncomfortably hot with temperatures reaching 32°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.
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.
