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Climate · Rio de Janeiro

Rio de Janeiro in September

Warm and damp, as the days lengthen.

Typical weather, averaged over 30 years

September in Rio de Janeiro is warm: highs near 85°F, lows near 65°F. Rain falls on about two days a week, more often as the month goes on, and the days lengthen by 28 minutes from the first week to the last.September in Rio de Janeiro is warm: highs near 29°C, lows near 18°C. Rain falls on about two days a week, more often as the month goes on, and the days lengthen by 28 minutes from the first week to the last.

High
85°F29°Caverage
Low
65°F18°Caverage
Wet days
2a week · 34% of days
Daylight
12h 00mon average

Is September a good time to visit Rio de Janeiro?

A good month, just outside Rio de Janeiro's best months, which run from June to August.

How we judge it: every month is scored on how close its typical high comes to the range from 70°F to 80°F, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.How we judge it: every month is scored on how close its typical high comes to the range from 21°C to 27°C, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.

How September sits in the year

week by week

Temperature

Highs near 85°F in September, against 80°F to 91°F through the year.Highs near 29°C in September, against 27°C to 33°C through the year.

Chance of a wet day

34% of days in September, against 25% to 63% through the year.

Cloud cover

37% cover in September, against 31% to 73% through the year.

Daylight

12h 00m in September, against 10h 45m to 13h 31m through the year.

Week by week, lightly smoothed, with September shaded. The olive line marks the best months. Hover or tap a week for its figures.

Either side

  1. August82°28°low 63°low 17°2 wet days a weekRain on about two days a week.
  2. September85°29°low 65°low 18°2 wet days a weekRain on about two days a week.
  3. October85°29°low 68°low 20°3 wet days a weekRain on about three days a week.

Where Rio de Janeiro sits, in September

America/Sao Paulo
this place
typical high in September 40°F4°C95°F35°C
Sunrise, mid-September
5:50 AMsets 5:46 PM
Above the sea
0 mlow-lying
Latitude
22.9°Ssouthern hemisphere
Nearest of ours
São Paulo357 km west

The land around Rio de Janeiro, shaded by its typical high in September, the planning map's own layer. Hover the map for the figure at that spot; tap it on a phone. Clock times are local, for the 15th.

Elsewhere in Brazil in September

high · low · wet days
See September on the planning mapThe whole year in Rio de Janeiro

Typical weather, averaged over 30 years (1995–2024), read 11 km east of Rio de Janeiro. Its own grid square is mostly sea and holds only a daily average, so the page reads the nearest square with a true high and low near the town's height. Temperatures are adjusted against 66 weather stations: daytime highs read about 3.1°F cold in the source data and are raised to match, and both highs and lows are adjusted for the town's height (0 m) against the climate model's (66 m).Temperatures are adjusted against 66 weather stations: daytime highs read about 1.7°C cold in the source data and are raised to match, and both highs and lows are adjusted for the town's height (0 m) against the climate model's (66 m). Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not. Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.

Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not.

Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.