yearsofweather

Porto in August:
comfortably warm, almost no rain

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

Mean high26°Hottest day 36.4° (2018)
Mean low16°Coldest night 10.3° (2011)
Rain days2 days0-5 by year
Rainfall11mmDaylight 14.4 → 13.2 h
Porto's 12 months iBest: June to August
Trip types Beach Poorcool seaSightseeing on foot Goodmild and mostly dry
Sea temperature17.2°16.2-17.9° by year (last 6)
Sunrise / sunset (15th)06:44 / 20:35Daylight 14.4 → 13.2 h

Porto in August

The driest month of the year. It is the Portuguese holiday season and the beaches are busy. The vineyards upriver in the Douro valley are inland and can be much hotter than the city, so bring a hat and water.

Afternoons reached 26°C and nights settled at 16°C, warm enough to linger over lunch outdoors. The temperature swung about 10°C within a single day, so midday and evening called for different clothes. It stayed mostly dry, with 2 rain days on average. August was bone dry in 5 of 20 years, yet 2008 brought 5 rain days.

About 4 days a month still climbed past 30°C, the ones where you looked for shade. August 2010 averaged 27.9°C by day, 2.1°C above the 20-year mean.

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

Date by date i

‹ July August 2027 September ›
Sun
Mon
Tue
Wed
Thu
Fri
Sat
Week
1-7rain on 3% of days26° 16°
8-14rain on 5% of days26° 16°
15-21rain on 7% of days26° 15°
22-28rain on 5% of days25° 15°
29-31rain on 8% of days26° 15°

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

1-7rain on 3% of days26° 16°
8-14rain on 5% of days26° 16°
15-21rain on 7% of days26° 15°
22-28rain on 5% of days25° 15°
29-31rain on 8% of days26° 15°
Tap another date to change

200622mm
2007none
20085mm
2009none
2010none
2011none
2012none
2013none
2014none
2015none
2016none
2017none
2018none
2019none
2020none
2021none
20222mm
2023none
2024none
2025none
Holidays in August (2027)
  • August 15 Assumption Day

1 Local public holiday or break (busier, pricier)

Day by day temperature i

14°22°30°38° 1815222931

Mean high Mean low Coldest to warmest high in 20 years

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 5 d
2009
1 d 1 d
2010
0 d 1 d
2011
1 d 4 d
2012
0 d 3 d
2013
0 d 0 d
2014
1 d 3 d
2015
0 d 1 d
2016
0 d 0 d
2017
0 d 2 d
2018
0 d 1 d
2019
1 d 3 d
2020
0 d 2 d
2021
0 d 0 d
2022
0 d 1 d
2023
0 d 0 d
2024
0 d 0 d
2025
0 d 1 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
1
1
0
0
0
1
1
2
1
0
1
2
0
1
2
3
2
1
0
1
1
0
2
1
1
1
0
2
2
2
1
Rain days on trip
00010100100001000000

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

One row per year, one cell per day. 2013 had 0 rain days, 2008 had 5.

Porto through the year

MonthHighLowRain daysRainfallSea
January 14°7°12 days148mm 14°
February 16°7°11 days118mm 14°
March 17°9°11 days110mm 14°
April 19°11°10 days100mm 15°
May 21°12°8 days69mm 16°
JuneGood 23°15°6 days39mm 17°
JulyGood 26°16°2 days12mm 17°
AugustGood 26°16°2 days11mm 17°
September 25°15°6 days67mm 17°
October 22°14°11 days142mm 17°
November 17°10°13 days172mm 17°
December 15°8°13 days144mm 15°

Common questions

Does it rain a lot in Porto in August?

Over the past 20 years August averaged 2 rain days (1 mm or more) out of 31. Individual years ran from 0 in the driest to 5 in the wettest.

What should I wear in Porto in August?

Days averaged 26°C and nights 16°C. Pack a light layer for the evenings, T-shirts, and sunscreen plus a hat.

Can you swim in Porto in August?

Sea surface temperature averaged 17.2°C in August, too cold for most people without a wetsuit. Year to year it ranged 16.2-17.9°C. Check local flags for waves and jellyfish on the day.

Is August a good time to visit Porto?

On warmth and rain days alone, Porto's easiest months were June to August. August ranked first of 12.