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Porto Nacional weather by month
Historical averages 2016–2025 · not a forecast
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When is the best time to visit Porto Nacional?
For a warm holiday, the best week has been 27 June – 3 July (Weather Index 90). Favourable start dates for a 7-day trip run from 16 June to 26 July. September is warmest (37°C), July is driest and April to October have the most sun.
- Warmest
- September 37°C
- Coolest
- December to March 31°C
- Driest
- July less than 1% rain-day chance
- Wettest
- January 85% rain-day chance
- Sunniest
- April to October 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 Nacional
Porto Nacional 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 | 30.8 | 23.1 | 84.5 | 26.2 | 291.4 | 9.5 |
| February | 31.1 | 23.3 | 78.6 | 22.0 | 240.2 | 9.4 |
| March | 31.3 | 23.5 | 80.6 | 25.0 | 213.2 | 9.6 |
| April | 32.1 | 23.6 | 51.0 | 15.3 | 101.6 | 10.5 |
| May | 33.7 | 22.7 | 7.4 | 2.3 | 11.2 | 11.0 |
| June | 34.0 | 20.9 | 1.0 | 0.3 | 2.2 | 10.9 |
| July | 34.4 | 19.8 | 0.3 | 0.1 | 0.3 | 11.0 |
| August | 36.1 | 21.8 | 2.3 | 0.7 | 2.5 | 11.0 |
| September | 37.0 | 23.8 | 7.7 | 2.3 | 15.1 | 11.5 |
| October | 34.7 | 24.1 | 37.4 | 11.6 | 82.6 | 11.2 |
| November | 32.1 | 23.5 | 72.7 | 21.8 | 198.5 | 10.0 |
| December | 31.4 | 23.3 | 76.5 | 23.7 | 241.7 | 9.9 |
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.