Your October weather guide
WarmWeather in Porto in October
Porto in October suits a mild city break, but not a holiday that depends on dry weather. Average daytime highs are around 20°C, nights fall to about 13°C, and there are roughly 13 rainy days. For a UK traveller, the appeal is comfortable afternoon warmth without much risk of intense heat. The catch is rain: go with flexible plans, layers and waterproofs rather than expecting to spend every day outdoors.
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
- 20.1°C
- 9 in 10 days stay below 25°C
- Average night-time low
- 13.2°C
- coldest 10% of nights: 10°C or lower
- Compared with London
- +5.5°C
- London averages 14.6°C in October
- Sea temperature
- 16.7°C
- year to year: 16°C to 18°C
- Sunshine per day (est.)
- 4.6h
- 42% of 10.9 h of daylight
- Rainy days (1 mm+)
- 13
- 166 mm over the month
- Humidity
- 80%
- Days over 25°C
- 8%
- 1% over 30°C
- Record high 1991-2020
- 32.1°C
- 2011-10-14
- Record low 1991-2020
- 5.5°C
- 2018-10-29
- 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 October compares
October is the 5th warmest month of the year in Porto and ranks 112th of 134 destinations we compare for October - see where else is hot in October. Within Portugal it is 13th of 13 (Portugal in October). Against London's average high of 14.6°C in October, Porto is 5.5°C warmer by day and 4.8°C warmer at night.
Daytime and night-time in October
The typical October day in Porto peaks at 20.1°C, but that is an average: the warmest 10% of days reach 24.6°C or more. Roughly 1 in 13 days top 25°C and 1 in 91 pass 30°C. Nights average 13.2°C; one night in ten drops to 9.8°C or lower, so pack a layer for evenings - it is genuinely cool after dark. Between 1991 and 2020 the hottest October day here reached 32.1°C (2011-10-14) and the coldest night 5.5°C (2018-10-29).
Rain in October
Wet (more than 8 rainy days): about 13 days with 1 mm or more, 166 mm in total. Year to year it varies a lot - the wettest October was 1993 with 359 mm, the driest 2007 with 10 mm. Humidity averages 80%.
Sea temperature in October
The sea averages 16.7°C - too cold for most (under 18°c). Depending on the year it ranges from 15.5°C to 18.3°C. For the warmest sea here, come in September (17.5°C).
Sunshine and daylight
Around 4.6 hours of sunshine a day (estimated from cloud cover), 10.9 hours of daylight: the sun rises about 07:46 and sets about 18:54 local time in mid-October. Average cloud cover is 57%.
Is October a good time to visit Porto?
October is not the strongest month here: warm days and frequent rain. The best months for Porto on our scoring are July, August, September; months averaging 25°C or more: Jul, Aug.
Mild afternoons, cooler evenings and a cold sea
The daytime average makes October a reasonable choice if you prefer exploring without strong heat. A light top may be enough during warmer afternoons, but bring a jumper or jacket for evenings rather than packing only summer clothes. Colder nights can fall to around 10°C or below, so an extra layer is useful if you plan to stay out late. The sea is a different proposition from the air: at an average 16.7°C, it is cold rather than comfortably swimmable. Treat swimming as an optional cold-water dip if that already suits you, not the main reason to book. This is a better fit for time around the city than a swimming-focused holiday.
Allow for rain rather than planning around sunshine
Rain is the main compromise in October. With about 13 rainy days, a waterproof jacket and shoes that cope with wet pavements deserve space in your bag. That does not mean every outing will be wet, but it does make a rigid outdoor itinerary a poor fit. Keep indoor alternatives available and move longer walks to the drier spells in the forecast. Average sunshine is about 4.6 hours within 10.9 hours of daylight, so there is usable daylight without a promise of clear skies. If warmth and more dependable holiday weather matter more than travelling in October, July, August and September are better months overall.
A little perspective
Porto through the year
October 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% |
| Julybest | 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% |
| OctoberSelected | 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 October
Closest matches on daytime temperature, sea temperature and sunshine, in other countries.
A little more detail
Porto in October FAQs
Plain answers, grounded in the averages.
Is Porto hot in October?
Porto is warm in October: the average daytime high is 20.1°C and nights average 13.2°C. Roughly 1 in 13 October days reach 25°C.
Can you swim in the sea in Porto in October?
The sea around Porto averages 16.7°C in October, 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 October?
Porto sees about 13 rainy days (1 mm or more) and 166 mm of rain in a typical October. The wettest October between 1991 and 2020 was 1993 (359 mm) and the driest was 2007 (10 mm).
How sunny is Porto in October?
Porto gets around 4.6 hours of sunshine a day in October out of 10.9 hours of daylight (estimated from average cloud cover).
How does Porto compare with the UK in October?
Porto is on average 5.5°C warmer than London by day in October (20.1°C against 14.6°C).
What is the hottest October on record in Porto?
Between 1991 and 2020 the hottest October day in Porto reached 32.1°C on 2011-10-14, and the coldest night dropped to 5.5°C on 2018-10-29.
How much warmer is Porto than London in October?
Porto's average daytime high is 20.1°C, compared with London's 14.6°C - a difference of 5.5°C. That makes it a milder option for daytime exploring, though cool evenings and frequent rain mean you should still pack for autumn.
Is Porto likely to be hot in October?
Warm is a better expectation than hot. Only 8% of days reach 25°C, while 1% reach 30°C. Pack for mild afternoons and cool evenings, with lighter clothing available for a warmer spell rather than assuming summer heat throughout your stay.
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