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Rio de Janeiro weather by month
Historical averages 2016–2025 · not a forecast
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When is the best time to visit Rio de Janeiro?
For a warm holiday, the best week has been 20–26 June (Weather Index 94). Several start dates remain plausible, and the best timing varies between years. January, February and March are warmest (32°C), July is driest and September and December to April have the most sun.
- Warmest
- January, February and March 32°C
- Coolest
- June, July and August 27°C
- Driest
- July 17% rain-day chance
- Wettest
- January 66% rain-day chance
- Sunniest
- September and December to April 10 hours a day
A rain day has 1 mm or more, snow included, so a short shower counts. Monthly averages below give the amounts.
Monthly averages in Rio de Janeiro
Rio de Janeiro historical monthly estimates, 2016–2025. Temperatures and sunshine are daily averages.
| Month | High (°C) | Low (°C) | Rain-day chance (%) | Expected rain days | Precipitation (mm/month) | Sunshine (hours/day) |
|---|---|---|---|---|---|---|
| January | 32.2 | 24.0 | 65.8 | 20.4 | 244.6 | 10.0 |
| February | 32.3 | 23.8 | 64.3 | 18.0 | 218.3 | 10.1 |
| March | 31.6 | 23.3 | 58.4 | 18.1 | 168.3 | 10.2 |
| April | 29.5 | 21.3 | 40.0 | 12.0 | 104.4 | 9.7 |
| May | 27.8 | 19.0 | 28.4 | 8.8 | 55.4 | 9.0 |
| June | 27.1 | 17.7 | 25.0 | 7.5 | 35.6 | 8.8 |
| July | 26.6 | 16.6 | 16.8 | 5.2 | 31.1 | 8.8 |
| August | 27.0 | 17.3 | 28.4 | 8.8 | 60.4 | 8.7 |
| September | 28.9 | 19.5 | 28.0 | 8.4 | 59.8 | 9.6 |
| October | 28.9 | 21.1 | 53.5 | 16.6 | 138.3 | 8.5 |
| November | 29.0 | 21.2 | 58.0 | 17.4 | 180.7 | 9.3 |
| December | 30.9 | 22.9 | 65.5 | 20.3 | 211.0 | 10.0 |
Each month averages its own days. Precipitation includes snow. About the data
Sources
Open-Meteo · 1 Jan 2016 – 31 Dec 2025
- Open-Meteo Historical Weather API
- Local days, 2016–2025, every year weighted equally. Each weekly chart averages its own seven days, without smoothing.
- Shading shows the 10th–90th percentile of past days, not forecast confidence.
- A rain day has at least 1 mm, snow included. The last weekly period has eight days.
- Wind is the average daytime (10:00–18:00) maximum, not gusts. Daylight is calculated from latitude. Missing readings stay blank.
- Mugginess (dew point) comes from the original daily summaries, on UTC days.
- The live two-week forecast comes from the Open-Meteo Weather Forecast API. The Weather Index does not use it.