Valongo, Portugal — Weather in May 2027

Monthly climate averages for Valongo, Portugal. Based on 10-year ERA5 reanalysis data.

Csa Hot-Summer Mediterranean
8.3 /10
Good

May is a good month in Valongo

Climate Overview

Valongo, Portugal in May has warm conditions, with highs averaging 20.8°C (69°F). Sea temperature stays cool at 16.3°C (61°F).

This month falls at the end of Spring.

Daily highs in May gradually rise from around 20°C (68°F) at the start to 23°C (74°F) by month's end.

Rainfall is heaviest during the first third of the month, while the last third tends to be drier.

Expect around 11.6h of sunshine at the start of May, increasing to 12.4h by the end.

The warmest days tend to fall around the 31th, averaging 23.4°C (74°F).

Compared to April, this month is about 3°C warmer with 2 fewer rainy days. Temperatures will rise further into June.

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Monthly May Averages

Temperature
21°C / 12°C
Feels Like
21°C / 11°C
Rain
9 days · 80 mm
Sunshine
11.9h / day
Humidity
77% — Humid
Wind
17 km/h
Wind Direction
NW (318°)
Gusts
35 km/h
Daylight
14.5 h
Cloud Cover
54%
Clear Sky Days
5.8
UV Index
7 — High
Sea Temperature
16°C
Dew Point
13°C — Comfortable
Moon Phase
Waxing Gibbous · 66%

Climate Charts

Daily averages based on historical data (2016–2025)

Daily Temperature

28°C 24°C 20°C 16°C 12°C 8°C 4°C 151015202531
HighLow

Daily Precipitation

0 mm 2 mm 4 mm 6 mm 8 mm 151015202531
Rainfall

Daily Sunshine

0h 4h 8h 12h 16h 151015202531
Sunshine

Daily Wind Speed

0 5 10 15 20 25 151015202531
Wind Speed
Sun Position
Sunrise 06:17
Daylight 14.5h
Sunset 20:46

What to Expect

Daytime temperatures around 21°C (69°F) are ideal for full-day outdoor exploration.

Rain usually comes in shorter passing showers rather than all-day rain.

2 of the last 5 yearly records were warmer than this month's long-run average.

Compare Months

January
Fair
Temp
13°C / 6°C
Feels Like
11°C / 3°C
Rain
12days (156 mm) Wet
Sun
6.3h Fair
Humidity
84% Humid
UV
2.2 Moderate
View Details
February
Fair
Temp
15°C / 7°C
Feels Like
12°C / 4°C
Rain
10days (116 mm) Wet
Sun
7.6h Good
Humidity
81% Humid
UV
3.2 Moderate
View Details
March
Fair
Temp
15°C / 8°C
Feels Like
13°C / 5°C
Rain
13days (142 mm) Wet
Sun
9h Good
Humidity
79% Humid
UV
4.6 Moderate
View Details
April
Good
Temp
18°C / 10°C
Feels Like
17°C / 8°C
Rain
11days (136 mm) Wet
Sun
10.6h Excellent
Humidity
78% Humid
UV
6.2 High
View Details
May
Good
Temp
21°C / 12°C
Feels Like
21°C / 11°C
Rain
9days (80 mm) Wet
Sun
11.9h Excellent
Humidity
77% Humid
UV
7 High
View Details
June best
Excellent
Temp
23°C / 15°C
Feels Like
24°C / 15°C
Rain
8days (55 mm) Wet
Sun
12.7h Excellent
Humidity
78% Humid
UV
7.5 Very High
View Details
July best
Excellent
Temp
27°C / 17°C
Feels Like
29°C / 18°C
Rain
3days (14 mm) Excellent
Sun
13.1h Excellent
Humidity
72% Muggy
UV
7.8 Very High
View Details
August best
Excellent
Temp
27°C / 17°C
Feels Like
29°C / 18°C
Rain
2days (11 mm) Excellent
Sun
12.3h Excellent
Humidity
72% Muggy
UV
7.2 Very High
View Details
September best
Excellent
Temp
24°C / 16°C
Feels Like
25°C / 16°C
Rain
7days (56 mm) Good
Sun
10.5h Excellent
Humidity
74% Muggy
UV
5.7 High
View Details
October
Good
Temp
21°C / 13°C
Feels Like
21°C / 13°C
Rain
13days (173 mm) Wet
Sun
8.1h Good
Humidity
80% Humid
UV
3.8 Moderate
View Details
November
Wet
Temp
16°C / 10°C
Feels Like
14°C / 8°C
Rain
14days (183 mm) Wet
Sun
6.7h Fair
Humidity
84% Humid
UV
2.6 Moderate
View Details
December
Fair
Temp
14°C / 8°C
Feels Like
12°C / 5°C
Rain
14days (167 mm) Wet
Sun
6.1h Fair
Humidity
86% Very Muggy
UV
2.1 Moderate
View Details
Month Temp Feels Like Rain Sun Humidity UV Status
January 13°C / 6°C 11°C / 3°C 12days (156 mm) Wet 6.3h Fair 84% Humid 2.2 Moderate Fair View Details
February 15°C / 7°C 12°C / 4°C 10days (116 mm) Wet 7.6h Good 81% Humid 3.2 Moderate Fair View Details
March 15°C / 8°C 13°C / 5°C 13days (142 mm) Wet 9h Good 79% Humid 4.6 Moderate Fair View Details
April 18°C / 10°C 17°C / 8°C 11days (136 mm) Wet 10.6h Excellent 78% Humid 6.2 High Good View Details
May 21°C / 12°C 21°C / 11°C 9days (80 mm) Wet 11.9h Excellent 77% Humid 7 High Good View Details
June best 23°C / 15°C 24°C / 15°C 8days (55 mm) Wet 12.7h Excellent 78% Humid 7.5 Very High Excellent View Details
July best 27°C / 17°C 29°C / 18°C 3days (14 mm) Excellent 13.1h Excellent 72% Muggy 7.8 Very High Excellent View Details
August best 27°C / 17°C 29°C / 18°C 2days (11 mm) Excellent 12.3h Excellent 72% Muggy 7.2 Very High Excellent View Details
September best 24°C / 16°C 25°C / 16°C 7days (56 mm) Good 10.5h Excellent 74% Muggy 5.7 High Excellent View Details
October 21°C / 13°C 21°C / 13°C 13days (173 mm) Wet 8.1h Good 80% Humid 3.8 Moderate Good View Details
November 16°C / 10°C 14°C / 8°C 14days (183 mm) Wet 6.7h Fair 84% Humid 2.6 Moderate Wet View Details
December 14°C / 8°C 12°C / 5°C 14days (167 mm) Wet 6.1h Fair 86% Very Muggy 2.1 Moderate Fair View Details

What to Wear

Dress in layers — a mix of long sleeves, light sweaters, and a versatile jacket works best for changeable conditions.

A waterproof jacket or compact umbrella is recommended for occasional showers.

Packing List

UmbrellaSunscreen (SPF 30+)SunglassesComfortable walking shoes

Frequently Asked Questions

May is typically good for visiting Valongo, with average highs of 21°C (69°F) and around 9 rainy days. Valongo, Portugal in May has warm conditions, with highs averaging 20.8°C (69°F). Sea temperature stays cool at 16°C (
Valongo typically sees around 9 rainy days in May with 80 mm (3.1 in) of total rainfall. An umbrella should suffice.
Nights in Valongo during May are cool at around 12°C (54°F). Bring a jacket or sweater for evenings.
With highs of 21°C (69°F) and lows of 12°C (54°F) in May, we recommend: Umbrella, Sunscreen (SPF 30+), Sunglasses, Comfortable walking shoes. Comfortable walking shoes are essential.
May is not the most favourable month weather-wise in Valongo. Consider visiting during months with milder temperatures or less rainfall for a better experience.
The average UV index in Valongo during May is 7 (high). Wear sunscreen SPF 30+, a hat, and sunglasses. Limit direct sun exposure between 10 AM and 4 PM.
Valongo gets approximately 15 hours of daylight per day in May, with around 12 hours of sunshine.
Snow is uncommon in Valongo during May based on 10-year climate averages.

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