Brazil
Rio de Janeiro in September
In September, Rio de Janeiro averages a daytime high of 27 °C and a night-time low of 17 °C, with about 97 mm of rain over the month. It falls outside Rio de Janeiro's most comfortable months, June to August.
- Average high
- 27 °C
- Average low
- 17 °C
- Rain in the month
- 97 mm
- Daylight on 15 Sep
- 12 h
- Comfortable month
- No
- Places to stay
- 117
When to go
How September compares with the rest of the year in Rio de Janeiro
September is the 8th warmest month in Rio de Janeiro by average daytime high; across the year the highs run from 25 °C to 32 °C and the lows from 16 °C to 22 °C. By day, September is 1 °C warmer than August, and October is 1 °C warmer than September.
September brings 97 mm of rain, less than the monthly average of 144 mm (1723 mm a year); it is the 9th wettest month.
On 15 September the sun is up for about 12 h, against 10 h 40 min at the shortest and 13 h 30 min at the longest point of the year (calculated from the latitude, sunrise to sunset).
| Month | High | Low | Rain | Comfortable |
|---|---|---|---|---|
| January | 31 °C | 22 °C | 250 mm | |
| February | 32 °C | 22 °C | 184 mm | |
| March | 30 °C | 21 °C | 226 mm | |
| April | 29 °C | 20 °C | 131 mm | |
| May | 26 °C | 17 °C | 101 mm | |
| June | 26 °C | 16 °C | 59 mm | Yes |
| July | 25 °C | 16 °C | 58 mm | Yes |
| August | 26 °C | 16 °C | 55 mm | Yes |
| September | 27 °C | 17 °C | 97 mm | |
| October | 28 °C | 18 °C | 126 mm | |
| November | 28 °C | 19 °C | 203 mm | |
| December | 30 °C | 21 °C | 233 mm |
Comfortable means average daytime high between 18 °C and 29 °C and under 80 mm of rain in the month. Averages for 1991–2020 over the surrounding area, a grid square about 50 km across, so a coast or a nearby mountain can make the town itself warmer or cooler. Data: CRU TS v4.10, Climatic Research Unit, University of East Anglia (Open Database License).
When to go
Is September a good time to visit Rio de Janeiro?
Not by the measure used here: about 97 mm of rain is 80 mm or more. The comfortable months in Rio de Janeiro are June to August; the nearest are August, before, and June, after.
The measure is about weather for a city stay only; it says nothing about events, school holidays or prices.
Public holidays in Brazil in September
Nationwide public holidays; shops and offices may close on these dates.
When to go
Destinations near Rio de Janeiro that are comfortable in September
Within 300 km, nearest first, by the same measure.
Where to stay
Where to stay in Rio de Janeiro
This guide lists 117 places to stay in Rio de Janeiro, hotels recorded in Wikidata. By straight-line distance from the centre: 1–3 km, 19; 3–10 km, 86; 10 km or more, 12.
Sources: climate from CRU TS v4.10 (Climatic Research Unit, University of East Anglia; Open Database License), 1991–2020 averages; day length calculated from the latitude; public holidays from python-holidays (MIT); places to stay from each operator's own public pages and Wikidata. How this guide is made.