Climate averages 1991–2020
Porto Alegre weather
in October.
A warm, wet month: the 7th warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
October is a warm month in Porto Alegre: daytime highs average 23.8°C and nights cool to about 15.2°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 170 mm of rain on roughly 12 days, which makes October a wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 12 h 48 min on an average October day.
The nearest other city in this atlas is Guaíba (13 km away). In October its highs average 23.7°C, about as warm as Porto Alegre, with 170 mm of rain.
Among the 448 cities listed in Brazil, Porto Alegre ranks joint 397th of 448 for the warmest October highs and joint 408th of 448 for the driest October (rainfall, lowest first). The mean October high of those 448 cities is 28.3°C; Porto Alegre is 4.4°C cooler than that mean.
From October to November, average highs rise by 2.1°C to 26.0°C, and monthly rainfall falls from 170 mm to 122 mm.
The annual picture
October 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
Porto Alegre climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.2°C20.6°C | 20.6°C | 137 | 14.0 | 13.814 h |
| February | 28.8°C20.6°C | 20.6°C | 128 | 13.5 | 13.213 h |
| March | 27.5°C19.3°C | 19.3°C | 111 | 11.9 | 12.312 h |
| April | 24.9°C16.5°C | 16.5°C | 106 | 9.2 | 11.411 h |
| May | 21.1°C13.2°C | 13.2°C | 107 | 9.2 | 10.611 h |
| June | 19.0°C10.8°C | 10.8°C | 113 | 9.2 | 10.210 h |
| July | 18.4°C9.8°C | 9.8°C | 140 | 10.0 | 10.410 h |
| August | 20.6°C11.0°C | 11.0°C | 120 | 10.2 | 11.011 h |
| September | 21.6°C12.8°C | 12.8°C | 146 | 11.1 | 11.912 h |
| October, selected | 23.8°C15.2°C | 15.2°C | 170 | 12.4 | 12.813 h |
| November | 26.0°C16.8°C | 16.8°C | 122 | 10.9 | 13.614 h |
| December | 28.4°C19.2°C | 19.2°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
October in nearby cities
- Guaíba in OctoberBrazil · 13 kmHigh 23.7°C · Low 15.2°C · 170 mm rain
- Canoas in OctoberBrazil · 14 kmHigh 23.9°C · Low 15.2°C · 170 mm rain
- Alvorada in OctoberBrazil · 15 kmHigh 23.7°C · Low 15.3°C · 170 mm rain
- Viamão in OctoberBrazil · 21 kmHigh 23.0°C · Low 15.3°C · 170 mm rain
- Gravataí in OctoberBrazil · 25 kmHigh 23.8°C · Low 15.1°C · 170 mm rain
- São Leopoldo in OctoberBrazil · 31 kmHigh 23.9°C · Low 14.9°C · 194 mm rain
- Novo Hamburgo in OctoberBrazil · 41 kmHigh 23.7°C · Low 14.3°C · 194 mm rain
- Sapiranga in OctoberBrazil · 49 kmHigh 24.3°C · Low 15.1°C · 184 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 Porto Alegre) is explained once on the Porto Alegre year overview and on the Sources, method and limits page.
Canoas and Guaíba lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.