Rio Grande do Sul weather in March
March is one of the best months to visit Rio Grande do Sul: highs of 28°C (83°F) and about 103 mm (4.1 in) of rain on average. Nights average 18°C (65°F) and cloud cover 56% (NASA POWER, 2001–2025 averages). It is the 2nd driest month of the year and the 3rd warmest. Compared with February, it is cooler and about as wet; April brings highs of 26°C (78°F) and 98 mm (3.9 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 March a good time to visit Rio Grande do Sul?
best month Weather score 72/100.
Yes. March is one of the best months for weather in Rio Grande do Sul.
Does it rain a lot in Rio Grande do Sul in March?
Some rain is normal: about 103 mm (4.1 in) falls in an average March. It is the 2nd driest month of the year.
How warm is Rio Grande do Sul in March?
Days average 28°C (83°F) and nights 18°C (65°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 March
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 | 28°C (83°F) | 18°C (65°F) | 103 mm | best |
| Caxias do Sul | 25°C (78°F) | 15°C (59°F) | 124 mm | best |
| Pelotas | 27°C (80°F) | 18°C (65°F) | 113 mm | fair |
| Canoas | 28°C (83°F) | 18°C (65°F) | 103 mm | best |
| Santa Maria | 28°C (82°F) | 16°C (61°F) | 129 mm | best |
| Gravataí | 28°C (83°F) | 18°C (65°F) | 103 mm | best |
| Novo Hamburgo | 27°C (81°F) | 17°C (63°F) | 116 mm | best |
| Viamão | 28°C (83°F) | 18°C (65°F) | 103 mm | best |
| Passo Fundo | 27°C (80°F) | 16°C (60°F) | 126 mm | best |
| São Leopoldo | 28°C (83°F) | 18°C (65°F) | 103 mm | best |
| Rio Grande | 25°C (76°F) | 21°C (71°F) | 117 mm | best |
| Alvorada | 28°C (83°F) | 18°C (65°F) | 103 mm | best |