30YearWeather
Lisbon in August
Lisbon weather in August - Portugal
😊Warm & Pleasant

Lisbon Weather in August

Plan your August trip to Lisbon, Portugal. Based on 30 years of NASA data, expect temperatures of 27°C (high) to 18°C (low), with 1% rain probability and 8 hours of daily sunshine. The Atlantic Ocean averages 20°C in August. Great conditions with only 0 rainy days expected.

Avg High
27°C

Hottest around day 11

Avg Low
18°C

Coolest around day 26

Rainy Days
0days

1% avg rain chance

Sunshine
8hrs/day

Summer season

Sea Temperature in August

Atlantic Ocean(Atlântico)

19.5°C

Monthly Average

Water Feel
🏊Pleasant

Comfortable for most swimmers

Swim Rating
👍Good for swimming

Based on average sea surface temperature

Body of Water
Atlantic Ocean

Atlântico

Lisbon coastline

Lisbon August Weather Calendar

Click any day to see detailed weather information

Currency

EUR

Euro

Language

Portuguese

Driving

Right side

Connect

All of Lisbon has 4G from all Portuguese...

Safety

Very High Safety

GPI: 1.301

Travel Intelligence

Exclusive flight analytics & health data for Lisbon

Smart Flight Estimator

Airport-to-Airport Logistics

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Flight Connectivity Analysis

Airport traffic data & seasonal patterns

Major Hub
100/ 100
Traffic Index

Extremely busy airport

Peak Daily Arrivals

0

slots per day

Peak

Sep

Low

Jan

Monthly Traffic Distribution

262
Jan
311
Feb
305
Mar
323
Apr
337
May
843
Jun
1238
Jul
1242
Aug
1253
Sep
1187
Oct
1041
Nov
720
Dec
Traffic Level
Low Season

Key Connections

Madrid Adolfo Suárez –Barajas (MAD)
Barcelona (BCN)
Paris Orly (ORY)
Funchal Madeira (FNC)
Porto Francisco de Sá Carneiro (OPO)

Health & Safety Advisory

CDC travel health recommendations

6 Recommendations
COVID-19

All eligible travelers should be up to date with their COVID-19 vaccines. Please seeYour COVID-19 Vaccinationfor more information.

Hepatitis A

Consider hepatitis A vaccination for most travelers. It is recommended for travelers who will be doing higher risk activities, such as visiting smaller cities, villages, or rural areas where a traveler might get infected through food or water. It is recommended for travelers who plan on eating street food.

Hepatitis B

Recommended for unvaccinated travelers younger than 60 years old traveling to Portugal. Unvaccinated travelers 60 years and older may get vaccinated before traveling to Portugal.

Measles

Cases of measles are on the rise worldwide. Travelers are at risk of measles if they have not been fully vaccinated at least two weeks prior to departure, or have not had measles in the past, and travel internationally to areas where measles is spreading.All international travelers should be fully vaccinated against measles with the measles-mumps-rubella (MMR) vaccine, including an early dose for infants 6–11 months, according toCDC’s measles vaccination recommendations for international travel.

Rabies

Dogs infected with rabies are not commonly found in Portugal.If rabies exposures occur while in Portugal, rabies vaccines are typically available throughout most of the country.Rabies pre-exposure vaccination considerations include whether travelers 1) will be performing occupational or recreational activities that increase risk for exposure to potentially rabid animals and 2) might have difficulty getting prompt access to safe post-exposure prophylaxis.Please consult with a healthcare provider to determine whether you should receive pre-exposure vaccination before travel.For more information, seecountry rabies status assessments.

Yellow Fever

CDC recommendations:Vaccine isnotrecommended.Country entry requirements:Vaccine isnotrequired.Updated April 23, 2025

Source: CDC Travelers' Health

View Complete Health Guide

Is August a Good Time to Visit Lisbon?

👍Solid choice for most travelers
Short Answer

August is Lisbon's peak season for good reason: 27°C temperatures and 1% rain probability. But expect crowds (99% of annual maximum) and premium prices.

Decision Factors

Vaccinations required

Yellow Fever

Peak tourist season

99% of annual peak - expect crowds and peak prices

Excellent dry conditions

Only 1% rain probability - ideal for outdoor activities

Health precautions needed

Be aware of: Leptospirosis, Leishmaniasis, Zika

Plenty of sunshine

12.1h of sunshine daily

Rich cultural heritage

5 UNESCO World Heritage sites nearby

Good For

  • 👨‍👩‍👧‍👦
    Families with children

    Comfortable 27.4°C temperatures and low 1% rain risk

  • 🥾
    Outdoor enthusiasts

    Ideal hiking conditions: 27.4°C, 1% rain chance

  • 📸
    Photographers

    12.1h sunshine, 75% clear skies for golden hour shots

  • 🏛️
    Cultural tourists

    Comfortable conditions for exploring museums and sites

  • 💑
    Honeymoon couples

    Wedding score 100/100 with romantic weather conditions

Who Should Avoid

  • 💰
    Budget travelers

    Peak season means premium prices everywhere

930 observations30-year historical data
Confidence: 99%

"According to 30YearWeather's analysis of 30 years of NASA POWER satellite data,Lisbon in August averages 27°C with 1% precipitation probability."

📊 Source: 30YearWeather.com🛰️ Data: NASA POWER (1991-2021)View Methodology →

Frequently Asked Questions: Lisbon in August

What are the temperatures in Lisbon in August?

Daytime highs average 27°C, nights drop to 18°C. Temperatures remain fairly consistent.

How many rainy days in Lisbon in August?

Expect around 0 days with measurable rainfall. Rain is unlikely to disrupt plans.

What to wear in Lisbon in August?

Comfortable casual wear with a light jacket for evenings.

Is August peak season in Lisbon?

This is typically peak season with higher prices. Book 2-3 months ahead.