Climate averages 1991–2020
Rio das Ostras weather
in October.
A warm, wet month: the 7th warmest and the 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
October is a warm month in Rio das Ostras: daytime highs average 26.6°C and nights cool to about 20.2°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 108 mm of rain on roughly 12 days, which makes October a wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 36 min on an average October day.
The nearest other city in this atlas is Macaé (23 km away). In October its highs average 26.2°C, about as warm as Rio das Ostras, with 86 mm of rain.
Among the 448 cities listed in Brazil, Rio das Ostras ranks joint 307th of 448 for the warmest October highs and joint 209th of 448 for the driest October (rainfall, lowest first). The mean October high of those 448 cities is 28.3°C; Rio das Ostras is 1.7°C cooler than that mean.
From October to November, average highs rise by 0.2°C to 26.8°C, and monthly rainfall rises from 108 mm to 203 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
Rio das Ostras climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.4°C23.2°C | 23.2°C | 206 | 16.5 | 13.313 h |
| February | 29.8°C23.4°C | 23.4°C | 141 | 12.8 | 12.913 h |
| March | 28.6°C22.8°C | 22.8°C | 172 | 17.6 | 12.212 h |
| April | 27.2°C21.3°C | 21.3°C | 85 | 12.1 | 11.612 h |
| May | 25.1°C19.1°C | 19.1°C | 60 | 9.5 | 11.111 h |
| June | 24.7°C17.9°C | 17.9°C | 31 | 5.9 | 10.811 h |
| July | 24.4°C17.4°C | 17.4°C | 29 | 5.6 | 10.911 h |
| August | 25.0°C17.8°C | 17.8°C | 34 | 6.5 | 11.311 h |
| September | 25.7°C18.9°C | 18.9°C | 73 | 10.0 | 11.912 h |
| October, selected | 26.6°C20.2°C | 20.2°C | 108 | 11.9 | 12.613 h |
| November | 26.8°C21.0°C | 21.0°C | 203 | 17.5 | 13.213 h |
| December | 28.4°C22.4°C | 22.4°C | 222 | 19.0 | 13.513 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
- Macaé in OctoberBrazil · 23 kmHigh 26.2°C · Low 20.4°C · 86 mm rain
- São Pedro da Aldeia in OctoberBrazil · 38 kmHigh 24.7°C · Low 20.7°C · 75 mm rain
- Cabo Frio in OctoberBrazil · 41 kmHigh 24.6°C · Low 20.9°C · 54 mm rain
- Araruama in OctoberBrazil · 56 kmHigh 24.6°C · Low 20.7°C · 94 mm rain
- Nova Friburgo in OctoberBrazil · 66 kmHigh 24.7°C · Low 16.8°C · 179 mm rain
- Saquarema in OctoberBrazil · 68 kmHigh 25.4°C · Low 20.4°C · 67 mm rain
- Itaboraí in OctoberBrazil · 97 kmHigh 27.0°C · Low 19.1°C · 112 mm rain
- Maricá in OctoberBrazil · 100 kmHigh 27.1°C · Low 20.6°C · 72 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 Rio das Ostras) is explained once on the Rio das Ostras year overview and on the Sources, method and limits page.