Climate Chart of Alajuela, Costa Rica
Monthly data: Temperature °C, Rain (mm), Sunshine (h) · 2013–2023
For Alajuela, Costa Rica, the climate data cover 2013–2023. The monthly mean temperature stays within a relatively narrow range, from October / November at 20.5 °C to March / April at 22.5 °C. Rainfall and sunshine show clearer monthly contrasts: February has the lowest mean daily rainfall at 0.87 mm/day, while October has the highest at 18.10 mm/day. These averages describe broad monthly patterns, not the conditions on any particular day.
Climate overview
Temperature
Monthly mean temperatures peak at March / April and 22.5 °C, then reach their lowest point in October / November at 20.5 °C. The overall unweighted mean across monthly means is 21.3 °C. These figures describe average temperatures for whole months, not typical daytime highs, and they do not rule out warmer or cooler days.
Rain
Mean daily rainfall is lowest in February at 0.87 mm/day, making it a conditional option for visitors who prioritise lower average rainfall. The highest monthly mean is in October at 18.10 mm/day, when it is sensible to prepare for rain. Across the monthly means, the unweighted mean is 8.54 mm/day. These are daily average amounts, not monthly totals; a lower average does not guarantee rain-free days or indicate how often rain occurs.
Sunshine
Average daily sunshine reaches its monthly high in March at 10.83 hours/day, and its low in October at 7.17 hours/day. The unweighted mean across monthly sunshine averages is 8.88 hours/day. For outdoor sightseeing, these figures can help with broad daylight planning, but sunshine duration is not the same as day length and does not guarantee clear skies on a given day.
Best Travel Time Guide for Alajuela, Costa Rica: Ideal Seasons and Weather Insights
If cooler monthly averages are your priority, October / November is the relevant option: its monthly mean temperature is 20.5 °C. For lower average rainfall, consider February, with a mean daily amount of 0.87 mm/day; neither average guarantees what an individual day will bring. Plan rain-ready clothing or a compact umbrella if travelling in October, when mean daily rainfall reaches 18.10 mm/day. This is an average amount, not a forecast or a measure of rain frequency, so check conditions close to your visit. For outdoor plans guided by average sunshine, March has the highest mean daily duration at 10.83 hours/day, while October has the lowest at 7.17 hours/day. These comparisons can inform planning but do not promise sunshine on a particular day; the rainfall and temperature criteria point to different considerations rather than one universal best time to visit.
Climate Data Overview for Alajuela, Costa Rica
Explore the comprehensive climate data for Alajuela, Costa Rica. This detailed table provides valuable insights into temperature variations, precipitation levels, and seasonal changes, helping you understand the unique weather patterns of this region.
| Month | Average: Temperature °C | Rain (mm) / day | Snow (mm) / day | Sunshine (h) / day |
|---|---|---|---|---|
| Jan | 21.3 | 1.36 | 0.00 | 10.25 |
| Feb | 22.0 | 0.87 | 0.00 | 10.72 |
| Mar | 22.5 | 1.10 | 0.00 | 10.83 |
| Apr | 22.5 | 4.03 | 0.00 | 10.10 |
| May | 21.5 | 11.36 | 0.00 | 8.23 |
| Jun | 21.1 | 12.72 | 0.00 | 7.64 |
| Jul | 21.2 | 10.62 | 0.00 | 7.96 |
| Aug | 21.0 | 12.24 | 0.00 | 8.02 |
| Sep | 20.7 | 15.30 | 0.00 | 7.71 |
| Oct | 20.5 | 18.10 | 0.00 | 7.17 |
| Nov | 20.5 | 11.67 | 0.00 | 8.04 |
| Dec | 20.9 | 3.11 | 0.00 | 9.86 |
| Average | 21.3 | 8.54 | 0.00 | 8.88 |
