Your July weather guide
HotWeather in Porto in July
July is a good time to visit Porto if you want warm days without needing constant heat. Average daytime highs are around 25°C, nights fall to around 17°C, and there are about 4 rainy days across the month. That suits a city break with plenty of time outdoors, provided you pack a layer for evenings. The main catch is the sea: summer air temperatures do not translate into comfortably warm swimming.
Long-term climate averages for Porto, not a forecast · 1991-2020
Porto, month by month
Your snapshot
At a glance
The useful details for Porto.
- Average daytime high
- 25.3°C
- 9 in 10 days stay below 31°C
- Average night-time low
- 16.7°C
- coldest 10% of nights: 14°C or lower
- Compared with London
- +3.5°C
- London averages 21.8°C in July
- Sea temperature
- 17.1°C
- year to year: 16°C to 18°C
- Sunshine per day (est.)
- 9.9h
- 67% of 14.7 h of daylight
- Rainy days (1 mm+)
- 4
- 22 mm over the month
- Humidity
- 74%
- Days over 25°C
- 47%
- 13% over 30°C
- Record high 1991-2020
- 38.4°C
- 2013-07-07
- Record low 1991-2020
- 12.2°C
- 1997-07-03
- Flight from London
- ≈ 2 h 24 min
- 1286 km, short-haul (estimate for a direct flight)
Records are observed extremes within 1991-2020, not typical holiday conditions. Warm-day percentages are shares of days, not day counts.
How July compares
July is the 2nd warmest month of the year in Porto and ranks 120th of 134 destinations we compare for July - see where else is hot in July. Within Portugal it is 11th of 13 (Portugal in July). Against London's average high of 21.8°C in July, Porto is 3.5°C warmer by day and 3.2°C warmer at night.
Daytime and night-time in July
The typical July day in Porto peaks at 25.3°C, but that is an average: the warmest 10% of days reach 31.2°C or more. Roughly 1 in 2 days top 25°C and 1 in 7 pass 30°C. Nights average 16.7°C; one night in ten drops to 14.3°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest July day here reached 38.4°C (2013-07-07) and the coldest night 12.2°C (1997-07-03).
Rain in July
Some rain (4-8 rainy days): about 4 days with 1 mm or more, 22 mm in total. Year to year it varies a lot - the wettest July was 2000 with 63 mm, the driest 2020 with 0 mm. Humidity averages 74%.
Sea temperature in July
The sea averages 17.1°C - too cold for most (under 18°c). Depending on the year it ranges from 16.2°C to 18.0°C. For the warmest sea here, come in September (17.5°C).
Sunshine and daylight
Around 9.9 hours of sunshine a day (estimated from cloud cover), 14.7 hours of daylight: the sun rises about 06:15 and sets about 21:06 local time in mid-July. Average cloud cover is 33%.
Is July a good time to visit Porto?
Yes - it is one of the better months: hot days, manageable rain and long sunny days. The best months for Porto on our scoring are July, August, September; months averaging 25°C or more: Jul, Aug.
Warm days, with some hotter spells
Pack mainly for warm weather, but leave room for a light jumper or jacket. The average high of 25.3°C is comfortable for spending time outdoors in light clothing, though it is not a promise of heat every day: 47% of days reach 25°C. Hotter spells are possible, with 13% reaching 30°C, so keep plans flexible enough to take a shaded break at midday. Evenings need a different approach. The average night low is 16.7°C, and the coldest 10% of nights fall to 14.3°C or below. If you tend to stay out late, an extra layer is more useful than packing only summer clothes.
Plenty of sunshine, but keep a rain option
July offers about 9.9 hours of sunshine within 14.7 hours of daylight, giving you plenty of scope to move outdoor plans into the morning or later afternoon when the day feels hot. Sunscreen, sunglasses and a hat deserve space in your bag. Rain is a smaller concern than in a wet-weather holiday, but about 4 rainy days means it should not be dismissed altogether. A light waterproof and flexible plans are sensible; there is little reason to organise the whole trip around avoiding showers. Treat time by the sea differently from time in the city, too: the water remains cold, so plan around your tolerance for a bracing dip rather than assuming long swims.
A little perspective
Porto through the year
July is highlighted. See how it compares with the rest of the year.
| Month | Day | Night | Sea | Sun/day | Rain mm | Rainy days | Days 25°C+ |
|---|---|---|---|---|---|---|---|
| January | 12.9°C | 6.4°C | 13.4°C | 3.8 | 154 | 12 | 0% |
| February | 13.9°C | 6.5°C | 13.0°C | 4.7 | 103 | 9 | 0% |
| March | 16.3°C | 8.2°C | 13.4°C | 5.2 | 123 | 11 | 0% |
| April | 17.5°C | 9.8°C | 14.1°C | 5.8 | 123 | 12 | 4% |
| May | 20.0°C | 12.3°C | 15.2°C | 6.7 | 102 | 11 | 13% |
| June | 23.0°C | 15.0°C | 16.6°C | 8.2 | 39 | 6 | 29% |
| JulySelectedbest | 25.3°C | 16.7°C | 17.1°C | 9.9 | 22 | 4 | 47% |
| Augustbest | 25.9°C | 17.1°C | 17.4°C | 8.9 | 30 | 5 | 50% |
| Septemberbest | 23.9°C | 15.7°C | 17.5°C | 6.8 | 64 | 6 | 34% |
| October | 20.1°C | 13.2°C | 16.7°C | 4.6 | 166 | 13 | 8% |
| November | 15.7°C | 9.7°C | 15.5°C | 3.8 | 166 | 13 | 0% |
| December | 13.6°C | 7.5°C | 14.1°C | 3.4 | 170 | 13 | 0% |
Day = average daytime high, night = average night-time low, 1991-2020.Sun is hours per day; rainy days count 1 mm or more.
Day, night and sea
Monthly average temperatures, 1991-2020
- Day
- Night
- Sea
Best months here
On warmth, low rainfall and sunshine, start with these.
Keep exploring
Similar in July
Closest matches on daytime temperature, sea temperature and sunshine, in other countries.
Hungary · 27°C by day
Budapest
Czechia · 25°C by day
Prague
Slovenia · 25°C by day
Bled
France · 24°C by day
Paris
Italy · 28°C by day
Lake Garda
A little more detail
Porto in July FAQs
Plain answers, grounded in the averages.
Is Porto hot in July?
Porto is hot in July: the average daytime high is 25.3°C and nights average 16.7°C. Roughly 1 in 2 July days reach 25°C.
Can you swim in the sea in Porto in July?
The sea around Porto averages 17.1°C in July, which is cold for swimming without a wetsuit. Between 1991 and 2020 it ranged from 16°C to 18°C depending on the year.
How much does it rain in Porto in July?
Porto sees about 4 rainy days (1 mm or more) and 22 mm of rain in a typical July. The wettest July between 1991 and 2020 was 2000 (63 mm) and the driest was 2020 (0 mm).
How sunny is Porto in July?
Porto gets around 9.9 hours of sunshine a day in July out of 14.7 hours of daylight (estimated from average cloud cover).
How does Porto compare with the UK in July?
Porto is on average 3.5°C warmer than London by day in July (25.3°C against 21.8°C).
What is the hottest July on record in Porto?
Between 1991 and 2020 the hottest July day in Porto reached 38.4°C on 2013-07-07, and the coldest night dropped to 12.2°C on 1997-07-03.
Is Porto warmer than London in July?
Yes. Porto's average daytime high is 25.3°C, compared with 21.8°C in London, a difference of 3.5°C. That makes it a warmer choice for a summer city break, though you should still bring a layer for cooler evenings.
Is the sea warm enough for swimming?
The sea averages 17.1°C, with a year-to-year range of 16°C to 18°C, so expect cold water rather than a comfortable summer swim. If warm swimming is central to your holiday, Porto in July is unlikely to suit you.
Is July among the best months to go?
Yes. July sits alongside August and September among Porto's best months for weather. It suits travellers who want warm outdoor days and relatively little rain, but it is less convincing if your main priority is warm sea swimming.
About these averages
ERA5-Land climate reanalysis via Open-Meteo (11 km grid) and NOAA Coral Reef Watch 5 km sea temperatures, 1991-2020
Averages computed from daily values at Porto. Sea temperature from the nearest 5 km sea cell, 6 km from that point. Sunshine hours are estimated from average cloud cover.Records are the highest and lowest daily values in that 30-year period, not all-time records. These are climate averages, not a forecast for your trip. How we measure holiday weather
- Hot · 25°C+
- Warm · 20°C to below 25°C
- Mild · 15°C to below 20°C
- Cool · below 15°C