yearsofweather

Lisbon in August:
hot, almost no rain

Lisbon, Portugal · Records from 2006 to 2025. Not a forecast.

Mean high29°Hottest day 38.9° (2018)
Mean low19°Coldest night 15.9° (2007)
Rain days1 day0-3 by year
Rainfall4mmDaylight 14.2 → 13.1 h
Lisbon's 12 months iBest: May to July
Trip types Beach Poorcool seaSightseeing on foot Finemostly dry
Sea temperature18.4°18.1-18.8° by year (last 6)
Sunrise / sunset (15th)06:50 / 20:32Daylight 14.2 → 13.1 h

Lisbon in August

Locals head off on holiday and some small restaurants in the centre close. Inland areas are prone to heatwaves and wildfire risk in this season, so check the news before a day trip. City museums are a good refuge from the heat.

Lisbon in August ran hot: 29°C by day and 19°C at night. By midday the shade was the best seat in town. Rain fell on only 1 day on average. August could skip rain entirely: 10 of 20 years had none, while 2006 had 3 rain days.

Highs passed 30°C on 8 days on average. Not every year was typical: 2010 ran 2.0°C warmer than the mean, with highs of 30.7°C.

Hurricanes i No tropical storm passed within 300 km in this month over the last 20 years. Hurricanes: September and October

Date by date i

‹ July August 2027 September ›
Sun
Mon
Tue
Wed
Thu
Fri
Sat
Week
1-7rain on 2% of days29° 19°
8-14rain on 1% of days29° 19°
15-21rain on 6% of days29° 19°
22-28rain on 2% of days28° 19°
29-31rain on 2% of days28° 19°

0-5/206-8/209-11/2012-20/20

1-7rain on 2% of days29° 19°
8-14rain on 1% of days29° 19°
15-21rain on 6% of days29° 19°
22-28rain on 2% of days28° 19°
29-31rain on 2% of days28° 19°
Tap another date to change

2006none
2007none
2008none
20092mm
2010none
20115mm
2012none
2013none
2014none
2015none
2016none
2017none
2018none
2019none
2020none
2021none
2022none
2023none
2024none
2025none
Holidays in August (2027)
  • August 15 Assumption Day

1 Local public holiday or break (busier, pricier)

Your trip dates, the past 20 years

Trip dates ~

You can also click two dates on the axis. Hover a cell to see that day's rain.
Trip rain days Month rain days
2006
0 d 3 d
2007
0 d 2 d
2008
0 d 1 d
2009
1 d 1 d
2010
0 d 0 d
2011
1 d 3 d
2012
0 d 1 d
2013
0 d 0 d
2014
0 d 0 d
2015
0 d 1 d
2016
0 d 0 d
2017
0 d 1 d
2018
0 d 0 d
2019
1 d 3 d
2020
0 d 1 d
2021
0 d 0 d
2022
0 d 0 d
2023
0 d 0 d
2024
0 d 0 d
2025
0 d 0 d
Years with rain
Tap a date to start, tap another to end. Each cell is that date in one year.
'06'07'08'09'10'11'12'13'14'15'16'17'18'19'20'21'22'23'24'25
of 20
2
0
0
0
0
0
1
0
1
1
0
0
0
0
2
2
1
1
0
1
1
0
1
0
1
0
0
1
0
0
1
Rain days on trip
00010100000001000000

No rain1-9 mm10 mm or more Dates outside your trip are dimmed.

One row per year, one cell per day. 2010 had 0 rain days, 2006 had 3.

Lisbon through the year

MonthHighLowRain daysRainfallSea
January 15°9°10 days91mm 16°
February 16°10°9 days83mm 15°
March 18°11°8 days90mm 15°
April 21°13°8 days73mm 16°
MayGood 24°15°4 days45mm 17°
JuneGood 26°17°3 days15mm 18°
JulyGood 28°18°1 day2mm 18°
August 29°19°1 day4mm 18°
September 27°18°4 days36mm 19°
October 23°16°8 days98mm 18°
November 18°12°10 days132mm 18°
December 16°10°9 days102mm 16°

Common questions

Does it rain a lot in Lisbon in August?

Over the past 20 years August averaged 1 rain day (1 mm or more) out of 31. Individual years ran from 0 in the driest to 3 in the wettest.

What should I wear in Lisbon in August?

Days averaged 29°C and nights 19°C. Pack T-shirts, a light layer for the evenings, and sunscreen plus a hat.

Can you swim in Lisbon in August?

Sea surface temperature averaged 18.4°C in August, more for a paddle than a swim. Year to year it ranged 18.1-18.8°C. Check local flags for waves and jellyfish on the day.

Is August a good time to visit Lisbon?

On warmth and rain days alone, Lisbon's easiest months were May to July. August ranked 5 of 12.