yearsofweather

Porto in May:
cool, occasional rain

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

Mean high21°Hottest day 31.9° (2009)
Mean low12°Coldest night 5.6° (2018)
Rain days8 days2-14 by year
Rainfall69mmDaylight 14.0 → 14.9 h
Porto's 12 months iBest: June to August
Trip types Beach Poorcool seaSightseeing on foot Goodmild
Sea temperature16°15.2-17.7° by year (last 6)
Sunrise / sunset (15th)06:16 / 20:45Daylight 14.0 → 14.9 h

Porto in May

The Queima das Fitas student festival takes place in the first week of May, with parades and concerts every night. Rain drops off clearly and long days suit a Douro river cruise. The sea is still cold.

May was mild: 21°C by day, 12°C at night, the kind of range where you stop checking the thermometer. Out of 31 days, about 8 brought rain; the rest stayed dry. Averages hide a lot here: one year saw 2, another 14.

Daylight lasted 14.0 to 14.9 hours a day, so evenings stayed bright. Not every year was typical: 2020 ran 2.4°C warmer than the mean, with highs of 23.8°C.

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

Date by date i

‹ April May 2027 June ›
Sun
Mon
Tue
Wed
Thu
Fri
Sat
Week
May 1rain on 30% of days19° 10°
2-8rain on 27% of days21° 12°
9-15rain on 31% of days21° 12°
16-22rain on 23% of days22° 12°
23-29rain on 24% of days23° 13°
30-31rain on 20% of days24° 14°

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

May 1rain on 30% of days19° 10°
2-8rain on 27% of days21° 12°
9-15rain on 31% of days21° 12°
16-22rain on 23% of days22° 12°
23-29rain on 24% of days23° 13°
30-31rain on 20% of days24° 14°
Tap another date to change

2006none
2007none
20084mm
2009none
201013mm
20116mm
201222mm
20133mm
2014none
20154mm
201617mm
2017none
2018none
20197mm
2020none
2021none
2022none
2023none
2024none
20254mm
Holidays in May (2027)
  • May 1 Labour Day
  • May 27 Corpus Christi
  • May 31 Memorial Day

1 Local public holiday or break (busier, pricier)1 US holidays (flights fill up)

Day by day temperature i

9°17°25°33° 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 2 d
2007
1 d 11 d
2008
1 d 14 d
2009
0 d 7 d
2010
2 d 7 d
2011
2 d 7 d
2012
6 d 12 d
2013
2 d 9 d
2014
0 d 7 d
2015
5 d 6 d
2016
4 d 14 d
2017
1 d 7 d
2018
0 d 3 d
2019
2 d 4 d
2020
1 d 7 d
2021
0 d 9 d
2022
0 d 5 d
2023
3 d 9 d
2024
4 d 11 d
2025
4 d 9 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
6
5
5
6
4
3
6
9
8
7
6
5
8
5
4
5
4
7
4
2
4
6
4
6
3
4
5
4
7
4
4
Rain days on trip
01102262054102100344

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

One row per year, one cell per day. 2006 had 2 rain days, 2008 had 14.

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 May?

Over the past 20 years May averaged 8 rain days (1 mm or more) out of 31. Individual years ran from 2 in the driest to 14 in the wettest.

What should I wear in Porto in May?

Days averaged 21°C and nights 12°C. Pack a compact umbrella, a light layer for the evenings, and T-shirts.

Can you swim in Porto in May?

Sea surface temperature averaged 16°C in May, too cold for most people without a wetsuit. Year to year it ranged 15.2-17.7°C. Check local flags for waves and jellyfish on the day.

Is May a good time to visit Porto?

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