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Rio Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Rio.
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Climate overview of Rio
The climate in Rio, Peloponnese, Greece, is marked by large temperature swings across the seasons, ranging from 31°C (88°F) in August to 12°C (54°F) in January.
The city receives around 955 mm (38 in) of rainfall per year. It experiences a distinct dry season from June to August, with very warm summers and mild winters. December is the wettest month and August the driest. Sunshine peaks in July, when the city sees around 11.9 hours of sunshine per day.
Rio Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Rio - and find the best time to visit.
Monthly Temperature in Rio
In Rio, temperatures differ significantly between summer and winter months. On average, daytime temperatures range from a very warm 31°C (88°F) in August to a moderate 12°C (54°F) in January.
Nighttime temperatures range from 21°C (70°F) in August to 4°C (39°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Rio
On average, Rio receives a reasonable amount of rainfall, with an annual precipitation of 955 mm (38 in). The seasons in Rio bring significant changes in precipitation. The wettest month, December, receives high rainfall, with an average of 133 mm (5.2 in) of precipitation. This rainfall is distributed across 13 rainy days.
In contrast, the driest month, August, experiences much less rainfall, totaling 18 mm (0.7 in) over 3 rainy days. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our Rio Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Rio
In Rio, summer days are longer and more sunny, with daily sunshine hours peaking at 11.9 hours in July. As the darker season arrives, the brightness of the sun becomes less. December sees a soft sun for only 3.6 hours per average day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Data from: Patras, Greece (7 KM, 4 Miles).
Daily hours of sunshine
Data from: Patras, Greece (7 KM, 4 Miles).
Water Temperature in Rio
The mean water temperature over the year ranges from 15°C (59°F) in February to 26°C (79°F) in August.
Water temperature over the year
Data from: Patras, Greece (7 KM, 4 Miles).
Humidity in Rio by Month
The relative humidity is high throughout the year in Rio.
The city experiences its highest humidity in November, reaching 71%. In July, the humidity drops to its lowest level at 60%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Data from: Patras, Greece (7 KM, 4 Miles).
Wind Speed in Rio
The mean wind speed over the year ranges from 1 m/s (2 knots) in January, February, March, April, May, June, July, August, September, October, November and December to 1 m/s (2 knots) in January, February, March, April, May, June, July, August, September, October, November and December. What does this mean?
The mean monthly wind speed over the year (meters per second)
Data from: Patras, Greece (7 KM, 4 Miles).
Best Time to Visit Rio
The most comfortable overall weather for exploring Rio is usually found in May, June, September and October. Conditions are generally least comfortable in January, February and December.
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
Jan
wet
Feb
wet
Mar
mixed
Apr
very good
May
excellent
Jun
excellent
Jul
very good
Aug
very good
Sep
excellent
Oct
excellent
Nov
good
Dec
wet
- Best overall: May, June, September and October
- Warmest weather: July and August
- Most sunshine: July
- Fewest rainy days: June, July, August and September
- Best for swimming: June, July, August, September, October and November.
- Seasonal pattern: A distinct dry season from June to August, with very warm summers and mild winters
Frequently asked questions about the climate in Rio
What is the best time to visit Rio?
May, June, September and October typically offer the most optimal weather in Rio. In contrast, January, February and December tend to have less optimal conditions. Rio has a distinct dry season from June to August, with very warm summers and mild winters.
What temperatures can I expect in Rio?
Daytime highs range from 12°C (54°F) in January to 31°C (88°F) in August. Nighttime lows range from 4°C (39°F) to 21°C (70°F). Temperatures vary considerably through the year.
How much rain does Rio get?
Annual rainfall is around 955 mm (38 in). December is the wettest month with 133 mm (5.2 in), while August is the driest with 18 mm (0.7 in).
How sunny is Rio?
Rio receives around 2,725 hours of sunshine per year. July is the sunniest month with 358 hours, while December is the cloudiest with just 108 hours. Overall, Rio enjoys abundant sunshine.
Rio 3-Day Forecast
Rio on the map
Rio is highlighted - select any city to see its climate.
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