Climate Overview
The climate in Porto is hot. The average annual temperature is 28°C and approximately 1383mm of precipitation falls per year. March is the wettest month, receiving around 394mm of rainfall. Porto sits near the equator, so seasonal temperature differences are minimal throughout the year.
Temperature
Porto sees moderate temperature variation throughout the year, ranging from 23°C to 37°C. October is the hottest month, with daytime highs reaching 37°C and an average of 30°C. August is the coolest month, with minimum temperatures around 23°C and an average of 29°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs.
Precipitation
Porto is a fairly wet location, receiving approximately 1383mm of precipitation annually, which averages out to around 115mm per month. The wettest month is March, averaging 394mm of rainfall. April and February also tend to see above-average precipitation. The driest month is September, with just 1mm. That's 393mm less than March, 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.
Wind
Porto is mildly breezy, with an average annual wind speed of 13km/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 10km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 8km/h gap between the calmest and windiest months.
Seasons
87 days until Winter
It is currently autumn in Porto, which began on March 20, 2026. Porto sits near the equator, so the traditional four-season cycle is less pronounced — temperatures remain relatively stable year-round. The warmest period peaks in October at around 37°C, while the coldest stretch bottoms out in August near 23°C. Winter is next, beginning on June 21, 2026 — 87 days from now.
Spring
Temperatures range from 24 to 37°C. Precipitation is minimal, with only around 40mm for the entire season. Winds are moderate at around 17km/h. Light layers work well as temperatures warm through the season — a great time to be outdoors.
Summer
Temperatures range from 24 to 35°C. Rainfall is heavy, totalling around 500mm across the season with a monthly average of 167mm. Winds are generally light, averaging 12km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 24 to 32°C. Rainfall is heavy, totalling around 807mm across the season with a monthly average of 269mm. Winds are generally light, averaging 10km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 23 to 35°C. Precipitation is minimal, with only around 36mm for the entire season. Winds are generally light, averaging 14km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Monthly Climate Data
The table below shows monthly climate averages for Porto 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.
