Climate averages 1991–2020
Cabo Frio weather
in September.
A warm, moderately wet month: the 9th warmest and the 4th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Cabo Frio: daytime highs average 23.8°C and nights cool to about 20.0°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 47 mm of rain on roughly 7 days, which makes September a moderately wet month (the 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 57 min on an average September day.
The nearest other city in this atlas is São Pedro da Aldeia (9 km away). In September its highs average 23.9°C, about as warm as Cabo Frio, with 56 mm of rain.
Among the 448 cities listed in Brazil, Cabo Frio ranks joint 367th of 448 for the warmest September highs and joint 162nd of 448 for the driest September (rainfall, lowest first). The mean September high of those 448 cities is 27.5°C; Cabo Frio is 3.7°C cooler than that mean.
From September to October, average highs rise by 0.7°C to 24.6°C, and monthly rainfall rises from 47 mm to 54 mm.
The annual picture
September 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
Cabo Frio climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 27.2°C23.6°C | 23.6°C | 88 | 8.3 | 13.413 h |
| February | 27.6°C23.9°C | 23.9°C | 56 | 5.8 | 12.913 h |
| March | 27.1°C23.7°C | 23.7°C | 104 | 10.8 | 12.212 h |
| April | 26.1°C22.6°C | 22.6°C | 57 | 9.3 | 11.612 h |
| May | 24.3°C20.7°C | 20.7°C | 58 | 10.2 | 11.011 h |
| June | 23.7°C19.8°C | 19.8°C | 34 | 6.5 | 10.811 h |
| July | 23.3°C19.3°C | 19.3°C | 35 | 6.6 | 10.911 h |
| August | 23.4°C19.4°C | 19.4°C | 28 | 6.2 | 11.311 h |
| September, selected | 23.8°C20.0°C | 20.0°C | 47 | 6.9 | 11.912 h |
| October | 24.6°C20.9°C | 20.9°C | 54 | 7.8 | 12.613 h |
| November | 25.1°C21.7°C | 21.7°C | 101 | 10.7 | 13.213 h |
| December | 26.5°C22.9°C | 22.9°C | 96 | 9.8 | 13.514 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
September in nearby cities
- São Pedro da Aldeia in SeptemberBrazil · 9 kmHigh 23.9°C · Low 19.7°C · 56 mm rain
- Araruama in SeptemberBrazil · 32 kmHigh 23.9°C · Low 19.7°C · 74 mm rain
- Rio das Ostras in SeptemberBrazil · 41 kmHigh 25.7°C · Low 18.9°C · 73 mm rain
- Saquarema in SeptemberBrazil · 45 kmHigh 24.5°C · Low 19.3°C · 58 mm rain
- Macaé in SeptemberBrazil · 61 kmHigh 25.4°C · Low 19.2°C · 60 mm rain
- Maricá in SeptemberBrazil · 81 kmHigh 26.0°C · Low 19.2°C · 61 mm rain
- Nova Friburgo in SeptemberBrazil · 85 kmHigh 23.8°C · Low 15.2°C · 117 mm rain
- Itaboraí in SeptemberBrazil · 87 kmHigh 25.9°C · Low 17.4°C · 82 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 Cabo Frio) is explained once on the Cabo Frio year overview and on the Sources, method and limits page.