Climate averages 1991–2020
Araruama weather
in September.
A warm, moderately wet month: the 9th warmest and the 5th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Araruama: daytime highs average 23.9°C and nights cool to about 19.7°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 74 mm of rain on roughly 10 days, which makes September a moderately wet month (the 5th 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 Saquarema (13 km away). In September its highs average 24.5°C, 0.6°C warmer than Araruama, with 58 mm of rain.
Among the 448 cities listed in Brazil, Araruama ranks joint 364th of 448 for the warmest September highs and joint 262nd of 448 for the driest September (rainfall, lowest first). The mean September high of those 448 cities is 27.5°C; Araruama is 3.6°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 74 mm to 94 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
Araruama climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 27.5°C23.6°C | 23.6°C | 178 | 15.5 | 13.413 h |
| February | 28.0°C23.9°C | 23.9°C | 128 | 11.7 | 12.913 h |
| March | 27.2°C23.6°C | 23.6°C | 162 | 16.1 | 12.212 h |
| April | 26.1°C22.5°C | 22.5°C | 85 | 11.6 | 11.612 h |
| May | 24.2°C20.5°C | 20.5°C | 73 | 10.7 | 11.011 h |
| June | 23.6°C19.5°C | 19.5°C | 43 | 6.9 | 10.811 h |
| July | 23.2°C18.9°C | 18.9°C | 45 | 7.6 | 10.911 h |
| August | 23.4°C19.1°C | 19.1°C | 42 | 7.2 | 11.311 h |
| September, selected | 23.9°C19.7°C | 19.7°C | 74 | 9.9 | 11.912 h |
| October | 24.6°C20.7°C | 20.7°C | 94 | 11.1 | 12.613 h |
| November | 25.2°C21.5°C | 21.5°C | 172 | 15.9 | 13.213 h |
| December | 26.6°C22.9°C | 22.9°C | 189 | 16.8 | 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
- Saquarema in SeptemberBrazil · 13 kmHigh 24.5°C · Low 19.3°C · 58 mm rain
- São Pedro da Aldeia in SeptemberBrazil · 25 kmHigh 23.9°C · Low 19.7°C · 56 mm rain
- Cabo Frio in SeptemberBrazil · 32 kmHigh 23.8°C · Low 20.0°C · 47 mm rain
- Maricá in SeptemberBrazil · 49 kmHigh 26.0°C · Low 19.2°C · 61 mm rain
- Itaboraí in SeptemberBrazil · 55 kmHigh 25.9°C · Low 17.4°C · 82 mm rain
- Rio das Ostras in SeptemberBrazil · 56 kmHigh 25.7°C · Low 18.9°C · 73 mm rain
- Nova Friburgo in SeptemberBrazil · 68 kmHigh 23.8°C · Low 15.2°C · 117 mm rain
- São Gonçalo in SeptemberBrazil · 73 kmHigh 26.3°C · Low 18.1°C · 85 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 Araruama) is explained once on the Araruama year overview and on the Sources, method and limits page.