Avg high
26°C
Avg low
20°C
Rainfall
75 mm
Rain days
9.2
Sunshine
9.7 h/day
Daylight
11.9 h
What to pack for Rio de Janeiro in September
- t-shirts and light layers
- a light jacket for evenings
- a compact umbrella or rain shell — rain is frequent
- expect humid, sticky conditions
Humidity averages 80%; max daily wind around 19 km/h.
How September compares
Best months in Rio de Janeiro: May–September. See the full best time to visit Rio de Janeiro guide.
Rio de Janeiro in September: the details
In September, Rio de Janeiro sees average daytime highs of 26°C (80°F) and overnight lows of 20°C (67°F). Rainfall totals roughly 75 mm across 9.2 rainy days, and the sun shines about 9.7 hours per day with 11.9 hours of daylight mid-month. Relative humidity averages 80%.
These figures are climate normals computed from the ERA5 weather reanalysis (2019–2024) for Rio de Janeiro, Brazil (-22.91, -43.18) — see our methodology. Actual conditions vary year to year.
Where should you go next month?
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