Porto Climate Overview
Porto is influenced by a Mediterranean climate characterized by mild winters (average 10°C) and moderate summers (average 20°C). Rainfall concentrates between October and May, making winters humid, while June through September features dry and clear weather, making summer the prime travel season.
Located on Portugal’s Atlantic coast, Porto experiences minimal temperature fluctuations due to maritime influence, with an annual precipitation of 1,255mm—the highest among Mediterranean climate cities.
Seasonal Weather in Porto
Spring (March–May)
Porto’s spring is cool, with temperatures gradually rising from 12.6°C in March to 16°C in May. Although foul weather and wind still occur frequently, sunny days alternate with these conditions, maintaining mild temperatures. Monthly rainfall ranges from 90–115mm, higher than summer but lower than winter, yet longer daylight hours make it ideal for outdoor activities. May temperatures can reach up to 20.4°C, creating an early summer atmosphere.
Summer (June–August)
Porto’s summer is characterized by mild and clear weather, with average temperatures ranging from 18.2°C in June to 19.9°C in August. Rainfall is minimal, with only 45mm in June, 20mm in July, and 25mm in August. Due to Atlantic ocean breezes, there are virtually no tropical nights, though occasional heat waves can push temperatures above 38°C. Sea water temperatures range from 18–19°C, remaining quite cold.
Autumn (September–November)
Porto’s autumn starts mild but becomes increasingly humid over time. Temperatures drop from 18.8°C in September to 13°C in November, with rainfall gradually increasing from 70mm in September to 160mm in November. Weather remains pleasant through mid-October, but afterward, Atlantic low-pressure systems bring frequent wind and rain.
Winter (December–February)
Porto’s winter is mild, with average temperatures around 10–11°C, making it one of Europe’s most comfortable winter destinations. Monthly rainfall is highest (140–195mm), occasionally with multi-day storms. Snow rarely falls, but nighttime temperatures can dip to around 0°C and occasionally as low as -3 to -4°C, while daily sunshine hours are minimal at approximately 4 hours.
Best Times to Visit Porto
Spring (March–May) and Autumn (September–October) are ideal, offering mild temperatures (13–24°C) and adequate rainfall for perfect outdoor activity conditions. May and September are particularly ideal months, allowing visitors to experience spring flowers and warmth or autumn grape harvest season tours while avoiding summer’s crowds and inflated prices.
Summer (June–August) marks Porto’s golden season, boasting Europe’s most abundant sunshine hours, clear skies, and numerous festivals, especially June’s São João Festival. However, this period sees tourism peaks with correspondingly high accommodation and airfare prices. If visiting during summer, advance accommodation reservations are essential.
Winter (December–February) is the low season, offering significantly lower travel costs. While temperatures remain mild (5–14°C) with special experiences like Christmas markets, frequent rainfall (140–195mm monthly) limits outdoor activities.
Porto’s Monthly Weather & Recommended Clothing
January
January is Porto’s coldest and most humid month, with average low temperatures around 6°C and highs of 13–14°C. Humid Atlantic winds and frequent rain (approximately 160mm monthly average) make the wind-chill feel considerably colder than actual temperatures. Clear days are rare; overcast conditions dominate.
Recommended Clothing: Insulated winter coats or padded jackets are essential, paired with waterproof outerwear to block wind and rain. Since indoor heating isn’t as strong as in Korea, layer with thermal underwear and thick sweaters. Porto’s slippery cobblestone streets (calçada) require waterproof boots or walkers with anti-slip soles.
February
February maintains winter conditions with temperatures ranging between 6°C and 15°C. Rainfall decreases slightly from January (around 130mm), but rain remains frequent with strong winds—raincoats prove more practical than umbrellas. Mornings and evenings are quite cold, though sunny afternoons may hint at approaching spring.
Recommended Clothing: Pack winter coats, scarves, and gloves to maintain body warmth. Layering thin pieces of clothing is more effective than wearing one heavy coat, allowing adjustment for indoor-outdoor temperature variations. Carry portable umbrellas and choose quick-drying pants to prepare for sudden showers.
March
Spring begins as temperatures rise from 8°C to 17°C, becoming considerably warmer, though weather remains highly changeable. “Rain followed by sudden sunshine” characterizes typical early spring weather, with monthly rainfall still substantial at 110–140mm.
Recommended Clothing: Trench coats, leather jackets, or lightweight padded vests that are easy to remove work well. Daytime activities are comfortable in thin long-sleeve shirts or blouses, while scarves or cardigans provide warmth for cool mornings and evenings. Light sneakers or flats are suitable footwear.
April
True spring weather arrives as temperatures rise to 11–18°C, though April is one of Porto’s rainiest months (often with 13+ rainy days). Warm weather and rainy spells alternate, with longer daylight hours making clear days perfect for outdoor activities.
Recommended Clothing: Given frequent rain, waterproof windbreakers or trench coats are wise choices. Wear cotton t-shirts or thin sweaters with active-wear pants like jeans or chinos. Always carry an umbrella in your bag.
May
One of the best travel months, May offers pleasant, mild weather with temperatures of 13–21°C. Rainfall drops significantly to the 80mm range, with abundant sunny days and warm enough daytime temperatures for short sleeves.
Recommended Clothing: Daytime allows for sleeveless t-shirts, thin blouses, or dresses, with thin cardigans or jackets for cool mornings, evenings, or shaded areas. While sandals become an option, comfortable walking shoes remain essential for exploring. Begin using sunglasses and sunscreen regularly.
June
June marks summer’s arrival with temperatures of 15–22°C—pleasant without being hot, ideal for activities. Rainy days are rare (less than 50mm monthly), with extended daylight lasting well past 9 PM around the summer solstice.
Recommended Clothing: Light summer wear (shorts, skirts, linen shirts) dominates, but Atlantic coastal breezes require a thin long-sleeve shirt or linen jacket. River-side evenings cool considerably, so always pack a light outer layer. Festival season makes comfortable, active footwear essential.
July
Typical Porto summer weather features temperatures of 17–25°C with low humidity—far more pleasant than Korean summers. Rain is minimal (under 20mm monthly), sunlight is intense, yet shaded areas provide cool comfort. Occasional heat waves may push temperatures above 30°C.
Recommended Clothing: Breathable linen or cotton—sleeveless tops, shorts, dresses—create comfortable summer wear. Wide-brimmed hats and sunglasses are essential for intense sunlight. Temperature variations between day and night may require thin shirts or cardigans for evening.
August
Porto’s warmest month, August sees temperatures of 17–25°C (sometimes exceeding 30°C) with dry conditions throughout. Days are hot under intense sun, but low humidity keeps discomfort at bay. Ocean swimming becomes enjoyable.
Recommended Clothing: Summer clothing remains as light and airy as July. Plan for beach visits with swimwear and beach wear; sandals or flip-flops are useful. Intense UV exposure demands skin protection through thin robes or long-sleeve shirts layered over swimwear.
September
End of summer and beginning of autumn coexist with mild temperatures of 16–24°C. Early month remains summer-hot, but late month brings cooler mornings and evenings with increasing rainfall. Weather is nearly as pleasant as May for travel.
Recommended Clothing: Mix short-sleeve and thin long-sleeve items. Wear summer clothes during the day, then layer with trench coats, jackets, or hooded sweatshirts for evenings. Scarves serve both temperature regulation and styling purposes.
October
Autumn deepens as the rainy season begins, with temperatures of 13–21°C. Monthly rainfall exceeds 120mm, creating more rainy days and increasingly strong winds. Clear days remain warm, but overcast days feel chilly.
Recommended Clothing: Focus on autumn jackets, thick cardigans, sweaters, and long pants. Maintain water-resistant windbreakers or lightweight rain jackets for sudden downpours. Choose active shoes or ankle boots over sandals.
November
November marks the transition to winter with temperatures of 10–16°C and very heavy rainfall (exceeding 160mm monthly). Shorter daylight hours and overcast skies make the air feel considerably colder.
Recommended Clothing: Early winter coats or lightweight padded jackets provide necessary warmth. Layering with shirts, vests, and sweaters works well, while scarves and gloves help block chilly winds. Ensure shoes have reliable waterproof protection.
December
December is Porto’s rainiest month (180–195mm), with temperatures of 9–14°C. While freezing temperatures rarely occur, high humidity and cold winds create penetrating dampness.
Recommended Clothing: Thick winter coats, padded jackets, and wool sweaters are essential. For wind and rain, hooded waterproof parkas or sturdy rain jackets prove more practical than umbrellas. Prepare leather boots or waterproof shoes, plus thick socks to keep feet dry.
Porto’s Monthly Temperature, Rainfall & Daylight
| Month | High Temp (°C) | Low Temp (°C) | Rainfall (mm) | Humidity (%) | Sunrise | Sunset |
| January | 13.5 | 5.8 | 168 | 87 | 07:55 | 17:25 |
| February | 14.8 | 6.5 | 137 | 85 | 07:30 | 18:00 |
| March | 17.0 | 8.0 | 112 | 78 | 06:45 | 18:35 |
| April | 18.0 | 9.0 | 108 | 75 | 06:55 | 20:10 |
| May | 20.2 | 11.2 | 86 | 78 | 06:20 | 20:45 |
| June | 23.3 | 14.1 | 53 | 70 | 06:00 | 21:05 |
| July | 25.5 | 15.9 | 15 | 63 | 06:15 | 21:00 |
| August | 26.0 | 15.7 | 20 | 64 | 06:40 | 20:30 |
| September | 24.1 | 14.7 | 62 | 73 | 07:10 | 19:40 |
| October | 20.5 | 11.6 | 129 | 80 | 07:45 | 18:50 |
| November | 16.7 | 8.6 | 146 | 84 | 07:20 | 17:15 |
| December | 14.1 | 6.7 | 171 | 87 | 07:50 | 17:05 |
Note: Temperature and rainfall data are based on 30-year historical averages. Relative humidity values are monthly averages, though morning and evening variations occur—winter months (November–January) feature very high humidity while summer months (July–August) remain comfortable. Sunrise and sunset times reflect mid-month and account for Daylight Saving Time (last Sunday of March to last Sunday of October) when clocks advance one hour.