Climate Insights for Mejillones

The climate in Mejillones is temperate. The average annual temperature is 18°C and approximately 17mm of precipitation falls per year. June is the wettest month, receiving around 4mm of rainfall. Mejillones 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: February, January, March. The coldest months are July, August, June, when temperatures can drop to 11°C.

Mejillones sees moderate temperature variation throughout the year, ranging from 11°C to 26°C. The warmest month is February, when average highs reach 26°C and the mean temperature sits around 22°C. July is the coolest month, with minimum temperatures around 11°C and an average of 15°C. Daily temperature variation is modest, with an average difference of 8°C between highs and lows.

Mejillones is a quite dry location, receiving approximately 17mm of precipitation annually, which averages out to around 1mm per month. The wettest month is June, averaging 4mm of rainfall. July and May also tend to see above-average precipitation. The driest month is December, with just 0mm. Precipitation varies noticeably between seasons, with the first half (January to June) of the year generally seeing more rainfall.

Mejillones is relatively calm, with an average annual wind speed of 2km/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 2km/h, though still comfortable for most outdoor activities. The calmest conditions occur in May, with average winds dropping to 2km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 0km/h between the calmest and windiest months.

It is currently winter in Mejillones, which began on June 21, 2026. Mejillones 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 February at around 26°C, while the coldest stretch bottoms out in July near 11°C. Spring is next, beginning on September 23, 2026 — 93 days from now.

The best time to visit Mejillones is during January, February, March, April, May, June, July, August, September, October, November and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 18°C with modest rainfall averaging 1mm per month. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Mejillones 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.