Climate Insights for Castro

The climate in Castro is warm and mild. The average annual temperature is 18°C and approximately 1463mm of precipitation falls per year. Castro receives a notable amount of rainfall throughout the year, including during its driest month. Castro 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, August, June, when temperatures can drop to 10°C.

Castro sees moderate temperature variation throughout the year, ranging from 10°C to 26°C. The warmest month is January, when average highs reach 26°C and the mean temperature sits around 21°C. July is the coolest month, with minimum temperatures around 10°C and an average of 14°C. On average, daily temperatures fluctuate by about 9°C between overnight lows and afternoon highs. The sharpest temperature change occurs between August and September, with a 3°C shift in average temperatures.

Castro is a fairly wet location, receiving approximately 1463mm of precipitation annually, which averages out to around 122mm per month. The wettest month is January, averaging 209mm of rainfall. December and October also tend to see above-average precipitation. The driest month is July, with just 52mm. That's 157mm less than January, the wettest month. Precipitation varies noticeably between seasons, with the first half (January to June) of the year generally seeing more rainfall.

Castro is mildly breezy, with an average annual wind speed of 16km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is October, averaging 18km/h, though still comfortable for most outdoor activities. The calmest conditions occur in April, with average winds dropping to 15km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 3km/h between the calmest and windiest months.

It is currently autumn in Castro, which began on March 20, 2026. Castro 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 26°C, while the coldest stretch bottoms out in July near 10°C. Winter is next, beginning on June 21, 2026 — 89 days from now.

The best time to visit Castro is during April, May, August and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 17°C with modest rainfall averaging 82mm per month. By contrast, January can be uncomfortably hot with highs reaching 26°C, while July is the coldest period with lows dropping to 10°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 Castro 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.