Weather in Porto 🇵🇹
Monthly weather averages & travel planning
August
Avg Temp
26°C
Rain Days
4 days
Sun Hours
12 hrs
Humidity
65%
Europe › 🇵🇹 Portugal › Porto
Updated: March 2026
Is August a Good Time to Visit Porto?
8/10
Excellent
August is a excellent time to visit Porto (8/10). With 12 daily sunshine hours and only 4 rain days, this month delivers genuinely reliable outdoor conditions, ranking it 4th sunniest of the year in Porto. Beach and outdoor-focused visitors will find August ideal, though hotel prices reflect demand and popular sites get crowded by mid-morning. September offers a similar profile at lower hotel rates if dates are flexible. The main practical note: Porto's popular sites are busiest between 10am and 3pm regardless of season. Arriving at opening time or after 4pm makes a significant difference to the experience. Planning tips: book accommodation at least 6-8 weeks ahead, as popular hotels fill quickly during August. Purchasing skip-the-line tickets for major attractions in advance saves meaningful time. If you have flexibility, arriving a few days before or after peak weekends reduces both crowds and prices noticeably.
vs July:25°C avg high
Porto's August climate peaks at 26°C each afternoon before cooling to 17°C overnight. 12 daily sunshine hours and just 4 wet days mean the odds of a fine day are solidly in your favour. It is an excellent window for outdoor itineraries.
26°C
79°F
Avg High
17°C
63°F
Avg Low
4 days
30 mm total
Rain Days
12h
per day avg
Sunshine
65%
Moderate
Humidity
Temperature in Porto in August
The 9°C day-night temperature range is typical for continental climates: a light jacket in the morning that you shed by midday and need again after sunset. Humidity averages 65%, which is comfortable for most visitors. On warmer days, lighter fabrics help with the mild stickiness in the afternoon. UV index averages 9 this month, classed as high to very high. SPF 30+ sunscreen, a brim hat, and sunglasses are not optional between 10am and 4pm. Wind averages 18 km/h, light enough to be refreshing on warm days but noticeable in open coastal areas or elevated viewpoints. In Fahrenheit: 79°F average high, 63°F overnight low. Data sourced from Open-Meteo ERA5 climate reanalysis (1991–2020 normals).
Temperature Trends
High
Low
Rainfall (mm)
0-20 mm21-50 mm51-100 mm100+ mm
What to Wear in Porto in August
Morning17°CBefore the day warms up
Afternoon26°CPeak daytime temperature
Evening20°CAfter sunset cools down
Packing for Porto in August means dressing for 26°C days and 17°C evenings. A light cotton tee with a casual overshirt works well at 26°C, the overshirt doubles as a layer for air-conditioned venues. Evening temperatures settle at 17°C, a modest 9°C drop that a light cardigan or denim jacket covers. European cobblestones reward low-profile walking shoes over flip-flops or heels, with cushioned trainers or leather walking shoes being the practical choice.
Local tip: Many of Porto's museums and galleries maintain cool interior temperatures regardless of outdoor conditions. A compact layer in your daypack lets you move between warm streets and chilled exhibition halls without discomfort.
Events in Porto in August
August has no major festivals or public holidays in Porto, which is one of its practical advantages for independent travellers. Attractions run at lower capacity than during peak event periods, queues are shorter, and accommodation is easier to find without needing to book many months in advance. Local restaurants, markets, and transport operate at a relaxed pace, making this an ideal time for visitors who prefer a more authentic, unhurried experience of everyday city life rather than large crowds drawn in by a single major headline event.
What to Pack for Porto in August
Based on 26°C average highs and 4 rainy days
- Light layers for morning and evening
- Breathable T-shirts and comfortable trousers
- UV-protective sunglasses
- Quick-dry travel towel
- Anti-chafe balm for long walking days
- Moisture-wicking synthetic fabrics for active days
- SPF 30+ sunscreen
- Comfortable walking shoes (a second pair lets the first air out overnight)
- Universal travel adapter
- Small day pack for city exploration
- Reusable water bottle
Best Activities in Porto in August
- Explore outdoor markets and street food stallsMid-morning (10am-12pm)At 26°C, the temperature is ideal for extended walking without overheating
- Guided walking tour of the historic centreMorning or late afternoonComfortable temperatures allow several hours on foot without fatigue
- Visit rooftop viewpoints and observation decksGolden hour (1 hour before sunset)Warm clear evenings provide exceptional visibility for panoramic photography
- Day trip to the surrounding countryside or coastFull day (depart by 8am)August is reliably dry enough for rural day trips without weather risk
- Afternoon in a world-class museum or galleryAfternoon (2-5pm)Pairs well with outdoor morning activities and provides a mid-day rest from sightseeing
- Coffee-house or traditional cafe culture experienceMid-morning or post-lunchA cultural ritual in this region that rewards slow appreciation regardless of weather
- Evening live music, theatre, or opera performanceEvening shows typically at 7-9pmConsistent evening temperatures make getting to and from evening venues comfortable
- Visit the main botanical garden or city park at seasonal peakYear-round; best light in morningAugust brings distinct seasonal changes to public green spaces worth exploring
- Seek out chilled local specialities: cold-brew tea, ice desserts, or chilled seafood at street-level stallsAny time; most atmospheric in evening marketsHot-weather street food culture peaks in August, with vendors setting up specifically for warm evenings
Why is Porto warm in August?
Porto's August weather is dominated by the Azores High, a semi-permanent subtropical anticyclone that blocks Atlantic rain systems from reaching the Mediterranean. As a result, August delivers reliably sunny, dry conditions with temperatures averaging 26°C. The sea moderates extreme heat and keeps overnight lows around 17°C, making the city noticeably more comfortable than inland Mediterranean destinations. Climate data: Open-Meteo ERA5 (1991–2020).
Sunshine Hours
The average number of hours per day with direct sunlight. Calculated from satellite measurements. Days with more than 7 hours of sunshine are ideal for outdoor activities. Under 3 hours means overcast conditions dominate.
UV Index
A scale from 0-11+ measuring ultraviolet radiation intensity. UV 0-2: Minimal risk. UV 3-5: Moderate, wear sunscreen. UV 6-7: High, hat and SPF 30+ essential. UV 8-10: Very High, limit midday exposure. UV 11+: Extreme, seek shade between 10am-4pm.
Rain Days
A rain day is counted when precipitation exceeds 0.1mm. This threshold captures even light drizzle. Unlike total rainfall in mm, rain days tells you how often you might need an umbrella, which is useful for planning outdoor activities.
Humidity
Relative humidity as a percentage. Below 40%: Dry, skin and throat may feel parched. 40-60%: Comfortable, ideal for most people. 60-80%: Sticky, light breathable fabrics recommended. Above 80%: Muggy, heat feels more intense; quick-dry clothing is essential.
Frequently Asked Questions
Porto in August
In August, Porto experiences average highs of 26°C (79°F) and lows of 17°C (63°F). Expect around 4 rainy days and 12 hours of sunshine per day, with humidity averaging 65%. The 9°C gap between daytime and overnight temperatures is worth planning around: light layers work for most visitors during the day, but an overshirt or cardigan handles the cooler evenings. UV index averages 9, so sun protection is advisable on clear days.
Porto typically sees 4 rainy days in August, with total precipitation of around 30mm. This makes August one of the drier months of the year, and a reliable window for outdoor sightseeing and day trips. Rain showers tend to be brief when they do occur. For context, the driest month in Porto typically sees 4-6 fewer rain days than August.
Pack light layers, a light jacket for evenings, comfortable walking shoes, and sunscreen for Porto in August. Daytime temperatures of 26°C are pleasant, but the evening drop to 17°C means a jacket is essential if you plan to be out after dark. Rain is infrequent with only 4 wet days, so a light rain layer is optional. Comfortable walking shoes are a priority given the amount of ground most visitors cover.
Yes, August is an excellent time to visit Porto. With 12 daily sunshine hours and only 4 rainy days, conditions are ideal for sightseeing and outdoor activities. Temperatures averaging 26°C during the day are comfortable for long walks and outdoor dining. This is peak travel season, so booking accommodation in advance and arriving at popular attractions early in the morning helps avoid the busiest periods.
The average high temperature in Porto in August is 26°C (79°F), and the average low is 17°C (63°F). The mean daily temperature is approximately 22°C (71°F). The day-to-night range of 9°C is moderate, meaning a single light jacket covers most situations. These are 30-year climate normals based on the 1991 to 2020 reference period; individual years will vary, particularly in transitional months like spring and autumn.
The best month to visit Porto is generally July. July offers the most sunshine at 14 hours per day and only 4 rainy days. Average temperatures reach 25°C, making it comfortable for sightseeing, outdoor dining, and exploring the city. If your travel dates are flexible, planning your trip around July gives you the best chance of dry, bright weather.
August is shoulder or low season in Porto, meaning fewer tourists and generally lower prices than peak months. With 12 sunshine hours and 4 rainy days, the weather is less of a draw for mass tourism. This is an advantage for travellers who prefer a quieter, more relaxed experience with shorter queues and easier accommodation availability.
In August, Porto suits a range of activities thanks to mild temperatures around 26°C. With few rainy days, outdoor activities are highly recommended. Top options include exploring historic neighbourhoods, visiting museums and galleries, local food markets, and day trips to surrounding areas. With 12 hours of sunshine, parks and waterfront walks are particularly enjoyable.
August ranks 4th sunniest of the year in Porto, with an average 12 daily sunshine hours. The driest months are July, August, and June. August is the hottest month (26°C avg high); January is the coolest (13°C). From here, temperatures fall 2°C into September. Compared to last month (July: 25°C high, 4 rain days), August is warmer and equally dry. August sits in the middle of the annual sunshine ranking for Porto, offering a reasonable balance of good weather and manageable crowds.
Year-Round Climate
| Month | High | Low | Rain Days | Sun | Details |
|---|---|---|---|---|---|
| January | 13°C | 6°C | 12 | 7h | View |
| February | 14°C | 6°C | 10 | 8h | View |
| March | 16°C | 8°C | 10 | 10h | View |
| April | 17°C | 10°C | 12 | 11h | View |
| May | 20°C | 12°C | 11 | 12h | View |
| June | 23°C | 15°C | 6 | 13h | View |
| July | 25°C | 17°C | 4 | 14h | View |
| August | 26°C | 17°C | 4 | 12h | View |
| September | 24°C | 16°C | 6 | 11h | View |
| October | 20°C | 13°C | 13 | 9h | View |
| November | 16°C | 10°C | 13 | 7h | View |
| December | 14°C | 7°C | 13 | 7h | View |
January
12 rain days, 7h sun
13°6°
February
10 rain days, 8h sun
14°6°
March
10 rain days, 10h sun
16°8°
April
12 rain days, 11h sun
17°10°
May
11 rain days, 12h sun
20°12°
June
6 rain days, 13h sun
23°15°
July
4 rain days, 14h sun
25°17°
August
4 rain days, 12h sun
26°17°
September
6 rain days, 11h sun
24°16°
October
13 rain days, 9h sun
20°13°
November
13 rain days, 7h sun
16°10°
December
13 rain days, 7h sun
14°7°
Other Months in Porto
Plan Your Trip to Porto
Nearby Destinations
Cities within 500 km with comparable weather conditions
Data Sources for Porto
Climate normals represent 30-year averages (1991-2020). Individual years may vary.