Monthly climate guide
Cabo Frio weather in September
September in Cabo Frio is typically warm, with average daytime highs around 24°C (75°F) and night-time lows near 21°C (69°F). The month usually brings about 62 mm of rain (some rain) and is a mix of sun and cloud. Daytime highs are about the same as August and about the same as October.
What stands out in September
- Rain is well below Cabo Frio's usual level (around 42% less).
- There's little difference between day and night (around 3°C).
- It's one of the drier stretches of the year in Cabo Frio.
- Only 2 months are cooler in Cabo Frio than September.
Avg high
24°C
75°F
Avg low
21°C
69°F
Rainfall
62 mm
some rain
Humidity
82%
relative
Sky
53%
cloud · a mix of sun and cloud
Cabo Frio weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 27°C / 80°F | 24°C / 75°F | 151 mm | 87% | 62% |
| February | 27°C / 81°F | 25°C / 76°F | 123 mm | 86% | 59% |
| March | 27°C / 81°F | 25°C / 76°F | 173 mm | 84% | 69% |
| April | 26°C / 79°F | 24°C / 75°F | 87 mm | 81% | 56% |
| May | 25°C / 76°F | 22°C / 72°F | 88 mm | 79% | 56% |
| June | 24°C / 75°F | 22°C / 71°F | 43 mm | 82% | 52% |
| July | 24°C / 74°F | 21°C / 69°F | 26 mm | 80% | 45% |
| August | 23°C / 74°F | 21°C / 69°F | 42 mm | 80% | 46% |
| September | 24°C / 75°F | 21°C / 69°F | 62 mm | 82% | 53% |
| October | 24°C / 76°F | 22°C / 71°F | 75 mm | 84% | 68% |
| November | 25°C / 76°F | 22°C / 72°F | 222 mm | 85% | 78% |
| December | 26°C / 79°F | 24°C / 74°F | 186 mm | 87% | 69% |
What to pack for September
- T-shirts plus a light layer for the evening
- Comfortable trainers or sandals for long walks
- A small travel umbrella, just in case
Is September a good time to visit Cabo Frio?
Compare the months in the chart above to find your ideal window.
Best time to visit Cabo Frio →Other Brazil cities in September
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Cabo Frio weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/brazil/cabo-frio/september
<a href="https://weathercompare.eu/weather/brazil/cabo-frio/september">Cabo Frio weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/brazil/cabo-frio" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Cabo Frio weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/brazil/cabo-frio/september">Cabo Frio weather in September</a> – WeatherCompare</p>
Cabo Frio in September: quick answers
Is September a good time to visit Cabo Frio?
September is a reasonable time for Cabo Frio: highs around 24°C and about 62 mm of rain, though not one of the three best months.
How warm is Cabo Frio in September?
Average highs are about 24°C (75°F) and average lows about 21°C (69°F), based on 10 years of daily data.
Does it rain a lot in Cabo Frio in September?
Cabo Frio typically gets around 62 mm of rain in September — some rain.
Figures are long-term averages for the area around Cabo Frio (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.