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Rio Grande Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Rio Grande.
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Climate overview of Rio Grande
Rio Grande, Puerto Rico, enjoys a steady climate throughout the year, with daytime temperatures typically around 29°C (84°F). August is the warmest month at 31°C (88°F), while January is the coolest at 28°C (82°F).
With around 1300 mm (51 in) of annual rainfall, Rio Grande has a notably wet climate. The wettest month is September. The sunniest month is March, with 9.5 hours of sunshine per day on average.
Rio Grande Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Rio Grande - and find the best time to visit.
Monthly Temperature in Rio Grande
The temperature in Rio Grande remains steady throughout the year, providing a consistently very warm climate. Average daytime temperatures reach a very warm 31°C (88°F) in August. In January, the coolest month of the year, temperatures drop to a comfortable 28°C (82°F).
At night, temperatures range from around 26°C (79°F) in August to 23°C (73°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Rio Grande
Rio Grande has a relatively rainy climate with high precipitation levels, averaging 1300 mm (51 in) of rainfall annually. Rio Grande can be quite wet during September, receiving approximately 164 mm (6.5 in) of precipitation over 18 rainy days.
In contrast, during the driest month (February), you will experience much drier conditions, with 57 mm (2.2 in) of precipitation spread across 15 rainy days. For more details, please visit our Rio Grande 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 Grande
Rio Grande experiences moderate variation in sunshine hours across the seasons. With 9.5 hours daily sunshine in March, it dips to 6.8 hours in November, offering a balanced mix of sunny and overcast days.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Data from: San Juan, Puerto Rico (18 KM, 11 Miles).
Daily hours of sunshine
Data from: San Juan, Puerto Rico (18 KM, 11 Miles).
Daily percentage of sunshine
Data from: San Juan, Puerto Rico (18 KM, 11 Miles).
Water Temperature in Rio Grande
The mean water temperature over the year ranges from 26°C (79°F) in January to 29°C (84°F) in August.
Water temperature over the year
Data from: San Juan, Puerto Rico (18 KM, 11 Miles).
Humidity in Rio Grande by Month
The relative humidity is high throughout the year in Rio Grande.
The city experiences its highest humidity in October, reaching 77%. In March, the humidity drops to its lowest level at 71%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Data from: San Juan, Puerto Rico (18 KM, 11 Miles).
Wind Speed in Rio Grande
The average wind speed over the year ranges from 2 m/s (4 knots) to 4 m/s (8 knots). It is lower in October and higher in July. What does this mean?
The mean monthly wind speed over the year (meters per second)
Data from: San Juan, Puerto Rico (18 KM, 11 Miles).
Best Time to Visit Rio Grande
For comfortable weather, consider visiting Rio Grande in January, February, March, April and December. Conditions are usually least favourable in June, July, August, September and October.
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
Jan
excellent
Feb
excellent
Mar
excellent
Apr
excellent
May
very good
Jun
mixed
Jul
mixed
Aug
mixed
Sep
mixed
Oct
mixed
Nov
very good
Dec
excellent
- Best overall: January, February, March, April and December
- Warmest weather: May, June, July, August, September, October and November
- Most sunshine: March and July
- Fewer rainy days: February, March, April, May and June
- Best for swimming: Any time of year. The sea stays pleasantly warm year-round.
Frequently asked questions about the climate in Rio Grande
What is the best time to visit Rio Grande?
January, February, March, April and December typically offer the most optimal weather in Rio Grande. In contrast, June, July, August, September and October tend to have less optimal conditions.
What temperatures can I expect in Rio Grande?
Daytime highs range from 28°C (82°F) in January to 31°C (88°F) in August. Nighttime lows range from 23°C (73°F) to 26°C (79°F). Temperatures stay relatively stable year-round.
How much rain does Rio Grande get?
Annual rainfall is around 1300 mm (51 in). September is the wettest month with 164 mm (6.5 in), while February is the driest with 57 mm (2.2 in).
How sunny is Rio Grande?
Rio Grande receives around 2,966 hours of sunshine per year. March is the sunniest month with 284 hours, while November is the cloudiest with just 203 hours. Overall, Rio Grande enjoys abundant sunshine.
Rio Grande 3-Day Forecast
Rio Grande on the map
Rio Grande is highlighted - select any city to see its climate.
Popular in September
Where to go in September - average daytime high across popular destinations.
San Juan
31°C (88°F) Fajardo30°C (86°F) Luquillo30°C (86°F) Aguada
30°C (86°F) Rincon30°C (86°F) Rio Grande31°C (88°F) Culebra30°C (86°F) Vieques30°C (86°F) Bucket list
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