Rio de Janeiro Weather in September
In September, Rio de Janeiro averages a high of 27°C (80°F) and a low of 19°C (67°F), based on 22 years of historical weather data from RIO DE JANEIRO.
27°C
Average high
80°F
19°C
Average low
67°F
38°C
Record high
100°F · 2021
7°C
Record low
44°F · 1990
What to Expect in Rio de Janeiro in September
Typical September days in Rio de Janeiro reach 27°C (80°F) during the afternoon and cool to around 19°C (67°F) overnight. On average, measurable rain falls on about 24% of days this month. Over the past 22 years, September temperatures in Rio de Janeiro have ranged from a record high of 38°C (2021) down to a record low of 7°C (1990).
For a day-by-day look or other months, see the full Rio de Janeiro weather history.