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Alajuela weather by month
Historical averages 2016–2025 · not a forecast
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When is the best time to visit Alajuela?
For a warm holiday, the best week has been 26 February – 4 March (Weather Index 99). Favourable start dates for a 7-day trip run from 17 January to 6 March. March and April are warmest (28°C), February is driest and February and March have the most sun.
- Warmest
- March and April 28°C
- Coolest
- November 25°C
- Driest
- February 13% rain-day chance
- Wettest
- September 95% rain-day chance
- Sunniest
- February and March 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 Alajuela
Alajuela 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 | 26.1 | 18.0 | 14.5 | 4.5 | 24.2 | 10.5 |
| February | 26.7 | 18.0 | 12.5 | 3.5 | 14.8 | 11.1 |
| March | 27.6 | 18.3 | 15.5 | 4.8 | 19.5 | 11.1 |
| April | 27.7 | 19.2 | 45.7 | 13.7 | 71.1 | 10.2 |
| May | 26.8 | 19.7 | 82.3 | 25.5 | 326.8 | 8.0 |
| June | 26.1 | 19.5 | 91.0 | 27.3 | 383.1 | 7.5 |
| July | 26.1 | 19.6 | 76.1 | 23.6 | 239.9 | 7.5 |
| August | 26.2 | 19.2 | 81.9 | 25.4 | 341.5 | 7.8 |
| September | 26.1 | 19.0 | 94.7 | 28.4 | 409.7 | 7.6 |
| October | 25.5 | 18.9 | 93.5 | 29.0 | 537.3 | 6.8 |
| November | 25.2 | 18.9 | 74.0 | 22.2 | 318.8 | 7.3 |
| December | 25.8 | 18.4 | 34.2 | 10.6 | 65.6 | 9.7 |
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.