Climate Insights for Ílhavo

The climate in Ílhavo is temperate. The average annual temperature is 16°C and approximately 990mm of precipitation falls per year. November is the wettest month, receiving around 144mm of rainfall. Ílhavo is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, September. The coldest months are January, February, December, when temperatures can drop to 9°C.

Ílhavo sees moderate temperature variation throughout the year, ranging from 9°C to 25°C. August is the warmest month, though highs remain moderate at 25°C with a mean of 20°C. January is the coolest month, with minimum temperatures around 9°C and an average of 11°C. Daily temperature variation is modest, with an average difference of 6°C between highs and lows. The sharpest temperature change occurs between October and November, with a 3°C shift in average temperatures.

Ílhavo is a moderately rainy area, receiving approximately 990mm of precipitation annually, which averages out to around 82mm per month. The wettest month is November, averaging 144mm of rainfall. October and December also tend to see above-average precipitation. The driest month is August, with just 6mm. That's 138mm less than November, 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.

Ílhavo 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 March, averaging 16km/h, though still comfortable for most outdoor activities. The calmest conditions occur in September, 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 3km/h between the calmest and windiest months.

It is currently autumn in Ílhavo, which began on September 23, 2026. Ílhavo is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in August at around 25°C, while the coldest stretch bottoms out in January near 9°C. Winter is next, beginning on December 21, 2026 (87 days from now).

The best time to visit Ílhavo is during May, June, July, August and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 19°C with modest rainfall averaging 31mm per month. By contrast, January can be quite cold with temperatures dropping to 9°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 Ílhavo 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.