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Porto weather by month
Historical averages 2016–2025 · not a forecast
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When is the best time to visit Porto?
For a warm holiday, the best week has been 12–18 August (Weather Index 98). Favourable start dates for a 7-day trip run from 5 August to 29 August. August is warmest (27°C), August is driest and July has the most sun.
- Warmest
- August 27°C
- Coolest
- January and December 14°C
- Driest
- August 7% rain-day chance
- Wettest
- November 47% rain-day chance
- Sunniest
- July 14 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
Porto 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 | 13.7 | 7.3 | 38.1 | 11.8 | 155.9 | 6.7 |
| February | 15.1 | 8.2 | 35.7 | 10.0 | 115.2 | 8.0 |
| March | 16.0 | 9.0 | 41.9 | 13.0 | 142.1 | 9.4 |
| April | 18.4 | 11.1 | 38.7 | 11.6 | 136.5 | 11.0 |
| May | 21.0 | 13.5 | 31.3 | 9.7 | 79.7 | 12.3 |
| June | 23.0 | 15.8 | 27.7 | 8.3 | 55.4 | 13.4 |
| July | 26.2 | 17.7 | 9.4 | 2.9 | 13.9 | 13.8 |
| August | 26.5 | 17.7 | 7.1 | 2.2 | 11.0 | 12.7 |
| September | 24.3 | 16.2 | 23.7 | 7.1 | 56.5 | 11.0 |
| October | 21.3 | 14.3 | 41.0 | 12.7 | 173.4 | 8.5 |
| November | 16.6 | 10.6 | 47.3 | 14.2 | 182.3 | 7.1 |
| December | 14.4 | 8.7 | 45.5 | 14.1 | 167.4 | 6.6 |
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.