Climate Insights for Unión

The climate in Unión is temperate. The average annual temperature is 18°C and approximately 523mm of precipitation falls per year. January is the wettest month, receiving around 75mm of rainfall. 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, December, February. The coldest months are July, June, August, when temperatures can drop to 3°C.

Temperatures in Unión vary considerably across the year, with a 30°C difference between the coldest and warmest months. The warmest month is January, when average highs reach 33°C and the mean temperature sits around 26°C. July is the coolest month, with minimum temperatures around 3°C and an average of 9°C. On average, daily temperatures fluctuate by about 13°C between overnight lows and afternoon highs. The sharpest temperature change occurs between April and May, with a 5°C shift in average temperatures.

Unión is a relatively dry area, receiving approximately 523mm of precipitation annually, which averages out to around 44mm per month. The wettest month is January, averaging 75mm of rainfall. October and December also tend to see above-average precipitation. The driest month is July, with just 11mm. That's 65mm less than January, 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.

Unión is moderately windy, with an average annual wind speed of 24km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is December, averaging 27km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in May, with average winds dropping to 20km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 7km/h between the calmest and windiest months. Wind tends to pick up during the summer months. The seasonal averages are 21km/h in winter, 26km/h in spring, 26km/h in summer, 22km/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 3°C. Winter is next, beginning on June 21, 2026 — 88 days from now.

The best time to visit Unión is during February, March, April, October, November and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 21°C with modest rainfall averaging 59mm per month. By contrast, January can be uncomfortably hot with highs reaching 33°C, while July is the coldest period with lows dropping to 3°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

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.