Rio Grande do Sul weather in August
August is one of the best months to visit Rio Grande do Sul: highs of 20°C (69°F) and about 116 mm (4.6 in) of rain on average. Nights average 10°C (50°F) and cloud cover 56% (NASA POWER, 2001–2025 averages). It is the 5th wettest month of the year and the 3rd coolest. Compared with July, it is warmer and drier; September brings highs of 22°C (71°F) and 157 mm (6.2 in) of rain.
Figures are long-term averages for Porto Alegre, the largest city in Rio Grande do Sul. See below for other places.
Is August a good time to visit Rio Grande do Sul?
best month Weather score 69/100.
Yes. August is one of the best months for weather in Rio Grande do Sul.
Does it rain a lot in Rio Grande do Sul in August?
Some rain is normal: about 116 mm (4.6 in) falls in an average August. It is the 5th wettest month of the year.
How warm is Rio Grande do Sul in August?
Days average 20°C (69°F) and nights 10°C (50°F).
Rio Grande do Sul weather by month
| Month | High | Low | Rain | Cloud | Weather |
|---|---|---|---|---|---|
| January | 29°C (85°F) | 20°C (67°F) | 120 mm | 58% | fair |
| February | 30°C (85°F) | 20°C (68°F) | 103 mm | 55% | best |
| March | 28°C (83°F) | 18°C (65°F) | 103 mm | 56% | best |
| April | 26°C (78°F) | 16°C (60°F) | 98 mm | 56% | best |
| May | 21°C (70°F) | 12°C (54°F) | 112 mm | 60% | best |
| June | 19°C (66°F) | 10°C (50°F) | 113 mm | 62% | fair |
| July | 18°C (65°F) | 9°C (48°F) | 149 mm | 58% | least pleasant |
| August | 20°C (69°F) | 10°C (50°F) | 116 mm | 56% | best |
| September | 22°C (71°F) | 12°C (53°F) | 157 mm | 62% | least pleasant |
| October | 24°C (75°F) | 14°C (57°F) | 155 mm | 63% | least pleasant |
| November | 26°C (79°F) | 16°C (60°F) | 110 mm | 54% | best |
| December | 28°C (83°F) | 18°C (64°F) | 110 mm | 55% | best |
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis). Page updated . How we rate months
Weather across Rio Grande do Sul in August
Weather can differ a lot within Rio Grande do Sul: coasts, hills and mountains each have their own climate.
| Place | High | Low | Rain | Weather |
|---|---|---|---|---|
| Porto Alegre | 20°C (69°F) | 10°C (50°F) | 116 mm | best |
| Caxias do Sul | 19°C (66°F) | 8°C (47°F) | 124 mm | best |
| Pelotas | 18°C (64°F) | 9°C (48°F) | 114 mm | least pleasant |
| Canoas | 20°C (69°F) | 10°C (50°F) | 116 mm | best |
| Santa Maria | 20°C (67°F) | 8°C (47°F) | 113 mm | best |
| Gravataí | 20°C (69°F) | 10°C (50°F) | 116 mm | best |
| Novo Hamburgo | 20°C (68°F) | 10°C (50°F) | 125 mm | best |
| Viamão | 20°C (69°F) | 10°C (50°F) | 116 mm | best |
| Passo Fundo | 20°C (67°F) | 8°C (47°F) | 116 mm | best |
| São Leopoldo | 20°C (69°F) | 10°C (50°F) | 116 mm | best |
| Rio Grande | 16°C (61°F) | 12°C (54°F) | 106 mm | least pleasant |
| Alvorada | 20°C (69°F) | 10°C (50°F) | 116 mm | best |