Climate Insights for Callao

The climate in Callao is warm and mild. The average annual temperature is 18°C and approximately 58mm of precipitation falls per year. March is the wettest month, receiving around 9mm of rainfall. Callao 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, March, January. The coldest months are September, August, October, when temperatures can drop to 15°C.

Callao has relatively stable temperatures year-round, staying within a 8°C range. February is the warmest month, though highs remain moderate at 23°C with a mean of 22°C. September is the coolest month, with minimum temperatures around 15°C and an average of 16°C. Daily temperature variation is modest, with an average difference of 1°C between highs and lows.

Callao is a quite dry location, receiving approximately 58mm of precipitation annually, which averages out to around 5mm per month. The wettest month is March, averaging 9mm of rainfall. January and February also tend to see above-average precipitation. The driest month is April, with just 2mm. 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.

Callao is moderately windy, with an average annual wind speed of 21km/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 24km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in February, with average winds dropping to 18km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 6km/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 23km/h in winter, 22km/h in spring, 19km/h in summer, 20km/h in autumn.

It is currently autumn in Callao, which began on March 20, 2026. Callao 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 23°C, while the coldest stretch bottoms out in September near 15°C. Winter is next, beginning on June 21, 2026 — 90 days from now.

The best time to visit Callao 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 5mm per month. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Callao 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.