Verdict: Excellent month
Rio de Janeiro Weather in September
September runs warm in Rio de Janeiro, with daily highs around 27°C (81°F) and nights near 20°C (68°F). Rain is occasional — about 8 wet days in a typical year. Overall, September is one of the best months of the year to be in Rio de Janeiro.
Average high
27°C / 81°F
Average low
20°C / 68°F
Rain days
~8
Precipitation
70 mm
What to pack for Rio de Janeiro in September
- Summer clothes, plus one light layer for air-con and evenings
- High-SPF sunscreen, sunglasses, and a refillable water bottle
- A packable rain shell or compact umbrella earns its space
- Comfortable walking shoes — every guide on this site assumes you'll use them
September against the rest of the year
Warmest in Rio de Janeiro: Jan (29°C / 84°F) · Coolest: Jun (25°C / 77°F) · Wettest: Dec (~17 rain days)
29°
23°
Jan
29°
24°
Feb
29°
23°
Mar
27°
21°
Apr
26°
20°
May
25°
19°
Jun
25°
18°
Jul
25°
18°
Aug
27°
20°
Sep
26°
21°
Oct
27°
21°
Nov
28°
22°
Dec
Daily highs / lows in °C · bars show rain days per month · ERA5 climate normals (2020–2024)