Lisbon Weather in August

🇵🇹 Portugal

27°C

High

19°C

Low

Rain Days

12h

Sunshine

65%

Humidity

Europe › 🇵🇹 Portugal › Lisbon

Updated: March 2026

Is August a Good Time to Visit Lisbon?

8/10

Excellent

August is a excellent time to visit Lisbon (8/10). With 12 daily sunshine hours and only 1 rain days, this month delivers genuinely reliable outdoor conditions, ranking it 4th sunniest of the year in Lisbon. 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: Lisbon'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:26°C avg high

Based on 30-year climate normals (1991 to 2020), August in Lisbon averages 27°C by day and 19°C overnight, a range that places it firmly in the warmer tier of the annual calendar. The month records approximately 12 sunshine hours per day and 4mm of total rainfall across 1 wet days, giving it a sunshine-to-rain ratio that is decidedly favourable for outdoor travel.

27°C

Avg High

19°C

Avg Low

1 days

Rain Days

12h

Sunshine

65%

Humidity

Temperature in Lisbon in August

The 8°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 24 km/h, light enough to be refreshing on warm days but noticeable in open coastal areas or elevated viewpoints. In Fahrenheit: 81°F average high, 66°F overnight low. Data sourced from Open-Meteo ERA5 climate reanalysis (1991–2020 normals).

Temperature in August

Monthly Precipitation (mm)

What to Wear in Lisbon in August

Morning19°CBefore the day warms up

Afternoon27°CPeak daytime temperature

Evening22°CAfter sunset cools down

Packing for Lisbon in August means dressing for 27°C days and 19°C evenings. A light cotton tee with a casual overshirt works well at 27°C, the overshirt doubles as a layer for air-conditioned venues. Evening temperatures settle at 19°C, a modest 8°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 Lisbon'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 Lisbon in August

August has no major festivals or public holidays in Lisbon, 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 Lisbon in August

Based on 27°C average highs and 1 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 Lisbon in August

Explore outdoor markets and street food stallsMid-morning (10am-12pm)At 27°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 Lisbon warm in August?

Lisbon'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 27°C. The sea moderates extreme heat and keeps overnight lows around 19°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: Lisbon in August

In August, Lisbon experiences average highs of 27°C (81°F) and lows of 19°C (66°F). Expect around 1 rainy days and 12 hours of sunshine per day, with humidity averaging 65%. The 8°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.

Lisbon typically sees 1 rainy days in August, with total precipitation of around 4mm. 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 Lisbon typically sees 4-6 fewer rain days than August.

Pack light layers, a light jacket for evenings, comfortable walking shoes, and sunscreen for Lisbon in August. Daytime temperatures of 27°C are pleasant, but the evening drop to 19°C means a jacket is essential if you plan to be out after dark. Rain is infrequent with only 1 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 Lisbon. With 12 daily sunshine hours and only 1 rainy days, conditions are ideal for sightseeing and outdoor activities. Temperatures averaging 27°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 Lisbon in August is 27°C (81°F), and the average low is 19°C (66°F). The mean daily temperature is approximately 23°C (73°F). The day-to-night range of 8°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 Lisbon is generally June. June offers the most sunshine at 13 hours per day and only 2 rainy days. Average temperatures reach 24°C, making it comfortable for sightseeing, outdoor dining, and exploring the city. If your travel dates are flexible, planning your trip around June gives you the best chance of dry, bright weather.

August is shoulder or low season in Lisbon, meaning fewer tourists and generally lower prices than peak months. With 12 sunshine hours and 1 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, Lisbon suits a range of activities thanks to mild temperatures around 27°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 Lisbon, with an average 12 daily sunshine hours. The driest months are July, August, and June. August is the hottest month (27°C avg high); January is the coolest (14°C). From here, temperatures fall 2°C into September. Compared to last month (July: 26°C high, 1 rain days), August is warmer and equally dry. August sits in the middle of the annual sunshine ranking for Lisbon, offering a reasonable balance of good weather and manageable crowds.

Year-Round Climate

Month	High	Low	Rain Days	Sun	Details
January	14°C	9°C	9	7h	View
February	14°C	9°C	8	8h	View
March	17°C	11°C	8	10h	View
April	18°C	12°C	8	11h	View
May	21°C	14°C	6	12h	View
June	24°C	17°C	2	13h	View
July	26°C	18°C	1	13h	View
August	27°C	19°C	1	12h	View
September	25°C	18°C	4	11h	View
October	21°C	16°C	9	9h	View
November	17°C	12°C	10	8h	View
December	14°C	10°C	9	7h	View

Other Months in Lisbon

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Plan Your Trip to Lisbon

Best Time to Visit Lisbon Lisbon vs Seville in August Lisbon vs Porto in August

Nearby Destinations with Similar Weather

These cities are within 500 km and experience broadly comparable weather conditions during the same calendar month, making them practical standalone alternatives or worthwhile additions to a longer regional itinerary.

Seville🇪🇸 Spain313 km away

35°C21°C low

Porto🇵🇹 Portugal275 km away

26°C17°C low

Data Sources for Lisbon

Lisbon on Wikipedia Open-Meteo Climate API NOAA National Centers UK Met Office WMO GeoNames

Climate normals represent 30-year averages (1991-2020). Individual years may vary.