Climate Overview
The climate in La Unión is warm and mild. The average annual temperature is 19°C and approximately 4072mm of precipitation falls per year. La Unión receives a notable amount of rainfall throughout the year, including during its driest month. La Unión sits near the equator, so seasonal temperature differences are minimal throughout the year.
Temperature
La Unión sees moderate temperature variation throughout the year, ranging from 15°C to 26°C. The warmest month is August, when average highs reach 26°C and the mean temperature sits around 20°C. September is the coolest month, with minimum temperatures around 15°C and an average of 19°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 4072mm of precipitation annually, which averages out to around 339mm per month. The wettest month is May, averaging 474mm of rainfall. April and March also tend to see above-average precipitation. The driest month is August, with just 110mm. That's 364mm less than May, the wettest month. Precipitation varies noticeably between seasons, with the first half (January to June) of the year generally seeing more rainfall.
Wind
La Unión is relatively calm, with an average annual wind speed of 1km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is August, averaging 1km/h, though still comfortable for most outdoor activities. The calmest conditions occur in November, with average winds dropping to 1km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 0km/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 sits near the equator, so the traditional four-season cycle is less pronounced — temperatures remain relatively stable year-round. The warmest period peaks in August at around 26°C, while the coldest stretch bottoms out in September near 15°C. Autumn is next, beginning on September 23, 2026 — 92 days from now.
Spring
Temperatures range from 15 to 24°C. Rainfall is heavy, totalling around 1386mm across the season with a monthly average of 462mm. Winds are generally light, averaging 1km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 15 to 26°C. Rainfall is heavy, totalling around 604mm across the season with a monthly average of 201mm. Winds are generally light, averaging 1km/h. Comfortable clothing with a light layer for cooler evenings is all you need.
Autumn
Temperatures range from 15 to 26°C. Rainfall is heavy, totalling around 1013mm across the season with a monthly average of 338mm. Winds are generally light, averaging 1km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 15 to 24°C. Rainfall is heavy, totalling around 1069mm across the season with a monthly average of 356mm. Winds are generally light, averaging 1km/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.
