Río, Greece — Weather in May 2027

Monthly climate averages for Río, Greece. Based on 10-year ERA5 reanalysis data.

Csa Hot-Summer Mediterranean
9 /10
Excellent

May is an excellent month in Río

Climate Overview

Río, Greece in May has warm conditions, with highs averaging 24.1°C (75°F). Sea temperature averages 20.2°C (68°F).

This month falls at the end of Spring.

Daily highs in May gradually rise from around 22°C (72°F) at the start to 25°C (77°F) by month's end.

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

Expect around 11.3h of sunshine at the start of May, increasing to 12.5h by the end.

The warmest days tend to fall around the 25th, averaging 25.6°C (78°F).

Compared to April, this month is about 4°C warmer with 1 more rainy days. Temperatures will rise further into June.

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Monthly May Averages

Temperature
24°C / 15°C
Feels Like
25°C / 15°C
Rain
9 days · 48 mm
Sunshine
12h / day
Humidity
71% — Humid
Wind
12 km/h
Wind Direction
WSW (253°)
Gusts
34 km/h
Daylight
14.3 h
Cloud Cover
45%
Clear Sky Days
5.8
UV Index
7.4 — Very High
Sea Temperature
20°C
Dew Point
14°C — Comfortable
Moon Phase
Waxing Gibbous · 66%

Climate Charts

Daily averages based on historical data (2016–2025)

Daily Temperature

32°C 28°C 24°C 20°C 16°C 12°C 8°C 151015202531
High Low

Daily Precipitation

0 mm 2 mm 4 mm 6 mm 151015202531
Rainfall

Daily Sunshine

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

Daily Wind Speed

0 4 8 12 16 20 151015202531
Wind Speed
Sun Position
Sunrise 06:22
Daylight 14.3h
Sunset 20:37

What to Expect

Daytime temperatures around 24°C (75°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
12°C / 6°C
Feels Like
10°C / 4°C
Rain
14days (144 mm) Wet
Sun
7.2h Good
Humidity
82% Humid
UV
2.8 Moderate
Snow Days
1days
View Details
February
Fair
Temp
14°C / 7°C
Feels Like
12°C / 5°C
Rain
9days (80 mm) Wet
Sun
8.3h Good
Humidity
80% Humid
UV
3.9 Moderate
Snow Days
1days
View Details
March
Good
Temp
16°C / 8°C
Feels Like
15°C / 6°C
Rain
12days (99 mm) Wet
Sun
9.7h Good
Humidity
77% Humid
UV
5.5 High
View Details
April
Good
Temp
20°C / 11°C
Feels Like
20°C / 10°C
Rain
8days (57 mm) Wet
Sun
11.2h Excellent
Humidity
73% Muggy
UV
6.9 High
View Details
May best
Excellent
Temp
24°C / 15°C
Feels Like
25°C / 15°C
Rain
9days (48 mm) Wet
Sun
12h Excellent
Humidity
71% Muggy
UV
7.4 Very High
View Details
June best
Excellent
Temp
30°C / 20°C
Feels Like
32°C / 22°C
Rain
5days (37 mm) Good
Sun
12.9h Excellent
Humidity
66% Muggy
UV
8.2 Very High
View Details
July
Good
Temp
33°C / 23°C
Feels Like
36°C / 26°C
Rain
3days (14 mm) Excellent
Sun
13.1h Excellent
Humidity
58% Moderate
UV
8.2 Very High
View Details
August
Good
Temp
33°C / 23°C
Feels Like
35°C / 26°C
Rain
4days (20 mm) Good
Sun
12.5h Excellent
Humidity
57% Moderate
UV
7.7 Very High
View Details
September best
Excellent
Temp
28°C / 20°C
Feels Like
29°C / 22°C
Rain
6days (64 mm) Good
Sun
10.6h Excellent
Humidity
69% Muggy
UV
6.2 High
View Details
October best
Excellent
Temp
23°C / 15°C
Feels Like
23°C / 15°C
Rain
8days (76 mm) Wet
Sun
9.1h Good
Humidity
77% Humid
UV
4.8 Moderate
View Details
November
Fair
Temp
18°C / 12°C
Feels Like
18°C / 11°C
Rain
12days (144 mm) Wet
Sun
7.5h Good
Humidity
82% Humid
UV
3.3 Moderate
View Details
December
Fair
Temp
14°C / 8°C
Feels Like
13°C / 6°C
Rain
12days (132 mm) Wet
Sun
6.9h Fair
Humidity
84% Humid
UV
2.5 Moderate
View Details
Month Temp Feels Like Rain Sun Humidity UV Status
January 12°C / 6°C 10°C / 4°C 14days (144 mm) Wet 7.2h Good 82% Humid 2.8 Moderate Fair View Details
February 14°C / 7°C 12°C / 5°C 9days (80 mm) Wet 8.3h Good 80% Humid 3.9 Moderate Fair View Details
March 16°C / 8°C 15°C / 6°C 12days (99 mm) Wet 9.7h Good 77% Humid 5.5 High Good View Details
April 20°C / 11°C 20°C / 10°C 8days (57 mm) Wet 11.2h Excellent 73% Muggy 6.9 High Good View Details
May best 24°C / 15°C 25°C / 15°C 9days (48 mm) Wet 12h Excellent 71% Muggy 7.4 Very High Excellent View Details
June best 30°C / 20°C 32°C / 22°C 5days (37 mm) Good 12.9h Excellent 66% Muggy 8.2 Very High Excellent View Details
July 33°C / 23°C 36°C / 26°C 3days (14 mm) Excellent 13.1h Excellent 58% Moderate 8.2 Very High Good View Details
August 33°C / 23°C 35°C / 26°C 4days (20 mm) Good 12.5h Excellent 57% Moderate 7.7 Very High Good View Details
September best 28°C / 20°C 29°C / 22°C 6days (64 mm) Good 10.6h Excellent 69% Muggy 6.2 High Excellent View Details
October best 23°C / 15°C 23°C / 15°C 8days (76 mm) Wet 9.1h Good 77% Humid 4.8 Moderate Excellent View Details
November 18°C / 12°C 18°C / 11°C 12days (144 mm) Wet 7.5h Good 82% Humid 3.3 Moderate Fair View Details
December 14°C / 8°C 13°C / 6°C 12days (132 mm) Wet 6.9h Fair 84% Humid 2.5 Moderate Fair View Details

What to Wear

Summer clothing like shorts, t-shirts, and sundresses will be comfortable. Bring a light cardigan for air-conditioned spaces.

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

Packing List

UmbrellaBreathable clothingSunscreen (SPF 30+)Sun hatSunglassesComfortable walking shoes

Frequently Asked Questions

May is typically excellent for visiting Río, with average highs of 24°C (75°F) and around 9 rainy days. Río, Greece in May has warm conditions, with highs averaging 24.1°C (75°F). Sea temperature averages 20.2°C (68°F).
Río typically sees around 9 rainy days in May with 48 mm (1.9 in) of total rainfall. An umbrella should suffice.
Evenings in Río during May are mild at 15°C (59°F). A light cardigan is usually enough.
With highs of 24°C (75°F) and lows of 15°C (59°F) in May, we recommend: Umbrella, Breathable clothing, Sunscreen (SPF 30+), Sun hat, Sunglasses. Comfortable walking shoes are essential.
Yes, May offers some of the best weather conditions in Río with comfortable temperatures and lower chances of rain.
The average UV index in Río during May is 7 (high). Wear sunscreen SPF 30+, a hat, and sunglasses. Limit direct sun exposure between 10 AM and 4 PM.
Río gets approximately 14 hours of daylight per day in May, with around 12 hours of sunshine.
Snow is uncommon in Río during May based on 10-year climate averages.

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