Rio Grande do Sul weather in May
May is one of the best months to visit Rio Grande do Sul: highs of 21°C (70°F) and about 112 mm (4.4 in) of rain on average. Nights average 12°C (54°F) and cloud cover 60% (NASA POWER, 2001–2025 averages). It is the 6th driest month of the year and the 4th coolest. Compared with April, it is cooler and about as wet; June brings highs of 19°C (66°F) and 113 mm (4.4 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 May a good time to visit Rio Grande do Sul?
best month Weather score 69/100.
Yes. May is one of the best months for weather in Rio Grande do Sul.
Does it rain a lot in Rio Grande do Sul in May?
Some rain is normal: about 112 mm (4.4 in) falls in an average May. It is the 6th driest month of the year.
How warm is Rio Grande do Sul in May?
Days average 21°C (70°F) and nights 12°C (54°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 May
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 | 21°C (70°F) | 12°C (54°F) | 112 mm | best |
| Caxias do Sul | 19°C (65°F) | 10°C (49°F) | 126 mm | fair |
| Pelotas | 20°C (68°F) | 12°C (53°F) | 116 mm | fair |
| Canoas | 21°C (70°F) | 12°C (54°F) | 112 mm | best |
| Santa Maria | 20°C (68°F) | 10°C (50°F) | 130 mm | best |
| Gravataí | 21°C (70°F) | 12°C (54°F) | 112 mm | best |
| Novo Hamburgo | 20°C (68°F) | 11°C (52°F) | 121 mm | best |
| Viamão | 21°C (70°F) | 12°C (54°F) | 112 mm | best |
| Passo Fundo | 20°C (68°F) | 10°C (49°F) | 135 mm | best |
| São Leopoldo | 21°C (70°F) | 12°C (54°F) | 112 mm | best |
| Rio Grande | 19°C (66°F) | 16°C (61°F) | 110 mm | fair |
| Alvorada | 21°C (70°F) | 12°C (54°F) | 112 mm | best |