Portugal Porto Weather in May — Climate Guide
May in Porto is very-high
Porto Weather in May — Quick Answer
As of 2026- Avg temp
- 20° / 11°
- Rainfall
- 80mm · 9 days
- Crowds
- Busy
As of 2026, Porto in May averages a high of 20°C and low of 11°C with 80mm of rain over about 9 days. Pleasant spring. T-shirt + light layers.
May is very-high for Porto.
Ideal weather — pre-peak crowds + warm enough for Foz beach + Douro Valley green peak.
Travel score
Porto May Weather Stats
Avg High
20°C
Avg Low
11°C
Rainy Days
9
80mm total
Sunshine
8h
Daily avg
Humidity
70%
moderate
UV Index
7
High
Wind
10 km/h
Gusts 25
Sea Temp
15°C
swimming chilly
Crowds
Busy
At attractions
May Sunrise & Sunset
Air Quality
PM2.5
12 μg/m³
PM10
22 μg/m³
Status
good
Feels-Like Temperature & Wind
Feels like
Daytime
20°C
Nighttime
11°C
Humidity and wind affect how the actual temperature feels.
Wind
10 km/h
Max gust 25 km/h
Activities Recommended for May
May Travel Pros & Cons
Pros
- 20°C ideal
- Daylight 14.5h
- Cellars + Douro perfect
- Foz beach accessible
Cons
- Hotels rising
May Events & Festivals
- Pre-summer shoulder
Porto in May — Full Picture
Ideal weather — pre-peak crowds + warm enough for Foz beach + Douro Valley green peak.
What to Wear & What to Pack
Pleasant spring. T-shirt + light layers.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
Current18.3°C
9.3°C
10.3/mo
Summer (Jun·Jul·Aug)
24.7°C
14.3°C
4/mo
Autumn (Sep·Oct·Nov)
20.7°C
11.7°C
9.7/mo
Winter (Dec·Jan·Feb)
14.3°C
6.3°C
12.7/mo
Porto Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| 14° | 6° | 13d·150mm | 4h | 80% | 2 | Quiet | Low season | |
| 15° | 6° | 12d·110mm | 5h | 78% | 3 | Quiet | Low season | |
| 17° | 8° | 11d·90mm | 6h | 75% | 5 | Moderate | Shoulder | |
| April (Best) | 18° | 9° | 11d·90mm | 7h | 73% | 6 | Busy | Peak |
| May (Best) | 20° | 11° | 9d·80mm | 8h | 70% | 7 | Busy | Peak |
| June (Best) | 23° | 13° | 6d·40mm | 9h | 70% | 8 | Very busy | Peak |
| July (Best) | 25° | 15° | 3d·20mm | 10h | 70% | 9 | Very busy | Peak |
| August (Best) | 26° | 15° | 3d·25mm | 9h | 70% | 9 | Very busy | Peak |
| September (Best) | 24° | 14° | 6d·60mm | 8h | 73% | 7 | Very busy | Peak |
| 21° | 12° | 11d·100mm | 6h | 78% | 5 | Moderate | Shoulder | |
| 17° | 9° | 12d·130mm | 4h | 80% | 3 | Quiet | Low season | |
| 14° | 7° | 13d·150mm | 4h | 80% | 2 | Moderate | Shoulder |
View Other Months
Porto May Hotel Picks
Frequently Asked Questions
Is May a good time to visit Porto?
Porto in May is very-high. Tourist crowds are busy and flight/hotel prices are peak.
What's the average temperature in Porto in May?
Porto May averages a high of 20°C and a low of 11°C.
Does it rain much in Porto in May?
Porto May averages 80mm of rainfall over about 9 rainy days.
What should I wear in Porto in May?
Pleasant spring. T-shirt + light layers.
What time are sunrise and sunset in Porto in May?
Porto May sunrise is 06:25 and sunset is 20:45, with 14h 20min of daylight.
What's the air quality like in Porto in May?
Porto May air quality (AQI) averages 35, rated Good. PM2.5 averages 12μg/m³.
What activities are recommended in Porto in May?
In May, Porto is great for Cellars, Ribeira, Douro Valley.
Is May peak season in Porto?
Porto May crowds are busy and prices are peak. Advance reservations are strongly recommended.
Best Months to Visit Porto
View Other Months
Planning a May trip to Porto?
You've checked the weather — next come the budget and the route.
Why you can trust weather guide
Based in Chiang Mai for 8+ years, with 30+ countries visited across Southeast Asia, Japan, and Europe. Every detail in this guide is primary-source verified as of April 2026, with prices auto-refreshed via live exchange rate APIs. This isn't AI-generated boilerplate — it's written from the perspective of someone who has actually been there.