Climate averages 1991–2020
Guaíba weather
in August.
A mild, wet month: the 10th warmest and the 5th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a mild month in Guaíba: daytime highs average 20.4°C and nights cool to about 11.0°C. By daytime temperature it is the 10th warmest of the 12 months.
Expect about 120 mm of rain on roughly 10 days, which makes August a wet month (the 5th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 02 min on an average August day.
The nearest other city in this atlas is Porto Alegre (13 km away). In August its highs average 20.6°C, about as warm as Guaíba, with 120 mm of rain.
Among the 448 cities listed in Brazil, Guaíba ranks joint 417th of 448 for the warmest August highs and joint 430th of 448 for the driest August (rainfall, lowest first). The mean August high of those 448 cities is 26.2°C; Guaíba is 5.8°C cooler than that mean.
From August to September, average highs rise by 1.1°C to 21.4°C, and monthly rainfall rises from 120 mm to 146 mm.
The annual picture
August in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Guaíba climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.2°C20.8°C | 20.8°C | 137 | 14.0 | 13.814 h |
| February | 28.8°C20.9°C | 20.9°C | 128 | 13.5 | 13.213 h |
| March | 27.6°C19.6°C | 19.6°C | 111 | 11.9 | 12.312 h |
| April | 24.9°C16.7°C | 16.7°C | 106 | 9.2 | 11.411 h |
| May | 21.1°C13.3°C | 13.3°C | 107 | 9.2 | 10.611 h |
| June | 18.9°C10.9°C | 10.9°C | 113 | 9.2 | 10.210 h |
| July | 18.3°C9.9°C | 9.9°C | 140 | 10.0 | 10.410 h |
| August, selected | 20.4°C11.0°C | 11.0°C | 120 | 10.2 | 11.011 h |
| September | 21.4°C12.8°C | 12.8°C | 146 | 11.1 | 11.912 h |
| October | 23.7°C15.2°C | 15.2°C | 170 | 12.4 | 12.813 h |
| November | 25.9°C16.9°C | 16.9°C | 122 | 10.9 | 13.614 h |
| December | 28.4°C19.3°C | 19.3°C | 124 | 11.8 | 14.014 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
August in nearby cities
- Porto Alegre in AugustBrazil · 13 kmHigh 20.6°C · Low 11.0°C · 120 mm rain
- Canoas in AugustBrazil · 26 kmHigh 20.7°C · Low 11.0°C · 120 mm rain
- Alvorada in AugustBrazil · 27 kmHigh 20.5°C · Low 11.1°C · 122 mm rain
- Viamão in AugustBrazil · 29 kmHigh 19.9°C · Low 11.2°C · 122 mm rain
- Gravataí in AugustBrazil · 37 kmHigh 20.6°C · Low 10.9°C · 122 mm rain
- São Leopoldo in AugustBrazil · 43 kmHigh 20.8°C · Low 10.8°C · 130 mm rain
- Novo Hamburgo in AugustBrazil · 52 kmHigh 20.6°C · Low 10.3°C · 130 mm rain
- Sapiranga in AugustBrazil · 61 kmHigh 21.3°C · Low 11.3°C · 126 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Guaíba) is explained once on the Guaíba year overview and on the Sources, method and limits page.
Porto Alegre and Canoas lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.