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Porto Velho weather by month
Historical averages 2016–2025 · not a forecast
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When is the best time to visit Porto Velho?
For a warm holiday, the best week has been 5–11 July (Weather Index 84). Favourable start dates for a 7-day trip run from 24 June to 20 July. August and September are warmest (34°C), July is driest and July, August and September have the most sun.
- Warmest
- August and September 34°C
- Coolest
- December to May 30°C
- Driest
- July 1% rain-day chance
- Wettest
- March 95% rain-day chance
- Sunniest
- July, August and September 11 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 Porto Velho
Porto Velho 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 | 30.0 | 23.8 | 91.3 | 28.3 | 305.9 | 8.4 |
| February | 29.7 | 23.8 | 93.9 | 26.3 | 330.9 | 7.8 |
| March | 29.9 | 23.9 | 94.5 | 29.3 | 340.0 | 7.4 |
| April | 30.3 | 23.9 | 86.7 | 26.0 | 243.3 | 8.6 |
| May | 30.5 | 23.4 | 51.6 | 16.0 | 99.2 | 10.0 |
| June | 30.8 | 22.6 | 19.0 | 5.7 | 28.1 | 10.4 |
| July | 32.8 | 21.9 | 1.0 | 0.3 | 1.7 | 10.9 |
| August | 33.6 | 22.9 | 17.4 | 5.4 | 30.2 | 10.8 |
| September | 33.7 | 24.0 | 39.7 | 11.9 | 70.8 | 11.0 |
| October | 32.6 | 24.1 | 64.2 | 19.9 | 152.8 | 10.3 |
| November | 31.2 | 23.9 | 80.0 | 24.0 | 224.6 | 9.1 |
| December | 30.1 | 23.8 | 92.9 | 28.8 | 340.2 | 8.3 |
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.