Climate Insights for Unión

The climate in Unión is warm and mild. The average annual temperature is 24°C and approximately 1423mm of precipitation falls per year. Unión receives a notable amount of rainfall throughout the year, including during its driest month. Unión is in the Southern Hemisphere. The seasons are reversed — summer runs from December to February, while winter falls between June and August. The summer months are: January, February, December. The coldest months are July, June, August, when temperatures can drop to 14°C.

Unión sees moderate temperature variation throughout the year, ranging from 14°C to 33°C. The warmest month is January, when average highs reach 33°C and the mean temperature sits around 28°C. July is the coolest month, with minimum temperatures around 14°C and an average of 19°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs. The sharpest temperature change occurs between April and May, with a 4°C shift in average temperatures.

Unión is a fairly wet location, receiving approximately 1423mm of precipitation annually, which averages out to around 119mm per month. The wettest month is October, averaging 182mm of rainfall. November and December also tend to see above-average precipitation. The driest month is June, with just 64mm. That's 118mm less than October, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall.

Unión is mildly breezy, with an average annual wind speed of 15km/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 17km/h, though still comfortable for most outdoor activities. The calmest conditions occur in February, with average winds dropping to 13km/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. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 16km/h in winter, 16km/h in spring, 13km/h in summer, 13km/h in autumn.

It is currently autumn in Unión, which began on March 20, 2026. Unión is in the Southern Hemisphere, where the seasons are reversed — spring starts in September, summer in December, autumn in March, and winter in June. The warmest period peaks in January at around 33°C, while the coldest stretch bottoms out in July near 14°C. Winter is next, beginning on June 21, 2026 — 89 days from now.

The best time to visit Unión is during June, July, August and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 20°C with modest rainfall averaging 75mm per month. By contrast, January can be uncomfortably hot with temperatures reaching 33°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.

The table below shows monthly climate averages for 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.