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Leiria weather by month
Historical averages 2016–2025 · not a forecast
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When is the best time to visit Leiria?
For a warm holiday, the best week has been 11–17 August (Weather Index 97). Favourable start dates for a 7-day trip run from 4 August to 2 September. July and August are warmest (27°C), August is driest and June and July have the most sun.
- Warmest
- July and August 27°C
- Coolest
- January 15°C
- Driest
- August 2% rain-day chance
- Wettest
- November 42% rain-day chance
- Sunniest
- June and 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 Leiria
Leiria 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 | 14.9 | 7.3 | 30.6 | 9.5 | 88.8 | 7.3 |
| February | 16.6 | 8.4 | 29.3 | 8.2 | 61.8 | 8.5 |
| March | 17.4 | 9.3 | 39.7 | 12.3 | 103.7 | 9.9 |
| April | 19.7 | 11.1 | 39.7 | 11.9 | 94.1 | 11.2 |
| May | 22.4 | 13.0 | 22.9 | 7.1 | 51.2 | 12.5 |
| June | 24.2 | 15.0 | 17.0 | 5.1 | 21.8 | 13.6 |
| July | 26.7 | 16.1 | 3.9 | 1.2 | 4.8 | 13.7 |
| August | 27.0 | 16.2 | 2.3 | 0.7 | 3.0 | 12.7 |
| September | 25.5 | 15.2 | 14.7 | 4.4 | 36.3 | 11.2 |
| October | 23.0 | 14.1 | 32.3 | 10.0 | 94.8 | 9.1 |
| November | 17.7 | 10.7 | 42.0 | 12.6 | 109.8 | 7.5 |
| December | 15.7 | 8.8 | 33.9 | 10.5 | 90.0 | 7.3 |
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.