Alajuela weather in September
In September, Alajuela sees average daytime highs of 24°C and overnight lows near 17°C, with 424 mm of rain across 28.3 wet days and about 12.1 hours of daylight. It is the 8th-warmest and 2nd-wettest month of the year here.
Day-to-day highs hold fairly steady near 24°C through the month. The sky is clear or mostly clear about 0% of the time in September, and the air most often feels humid.
Daylight stretches from about 12 h 12 min at the start of September to 11 h 54 min by month's end. Set against the rest of the year, September is Alajuela's 11th-clearest and 12th-windiest month. For the whole year in context, see Alajuela's year-round climate.
- Daytime high
- 24°
- 8th warmest
- Overnight low
- 17°
- 7th coldest
- Rainfall
- 424 mm
- 28.3 wet days
- Daylight
- 12 h 06 min
- 5:30 AM – 5:33 PM
- Cloud cover
- 92%
- 11th clearest
- Wind
- 4 km/h
- 12th windiest
- Solar energy
- 4.28 kWh/m²
- Travel score
- 3.7
- out of 10
- Air quality
- Good
- PM10 18 µg/m³ · 2018
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in September
Day-to-day highs hold fairly steady near 24°C through the month.
A typical September day in Alajuela reaches about 24°C in the afternoon and slips back to 17°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 26°C. Set against its neighbours, September runs on par with August and on par with October.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 |
| Avg low (°C) | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 25 | 17 |
| 2 | 25 | 17 |
| 3 | 25 | 17 |
| 4 | 25 | 17 |
| 5 | 25 | 17 |
| 6 | 25 | 17 |
| 7 | 25 | 17 |
| 8 | 25 | 17 |
| 9 | 25 | 17 |
| 10 | 24 | 17 |
| 11 | 24 | 17 |
| 12 | 24 | 17 |
| 13 | 24 | 17 |
| 14 | 24 | 17 |
| 15 | 24 | 17 |
| 16 | 24 | 17 |
| 17 | 24 | 17 |
| 18 | 24 | 17 |
| 19 | 24 | 17 |
| 20 | 24 | 17 |
| 21 | 24 | 17 |
| 22 | 24 | 17 |
| 23 | 24 | 17 |
| 24 | 24 | 17 |
| 25 | 24 | 17 |
| 26 | 24 | 17 |
| 27 | 24 | 17 |
| 28 | 24 | 17 |
| 29 | 24 | 17 |
| 30 | 24 | 17 |
Alajuela weather by month
How September compares with the rest of the year at a glance. September is the 8th-warmest and 2nd-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 25° / 16° | 29 | 5.8 | 11.5 | 7.8 |
| Feb | 25° / 16° | 20 | 4.1 | 11.7 | 8.0 |
| Mar | 26° / 17° | 20 | 5.2 | 11.9 | 7.5 |
| Apr | 27° / 17° | 62 | 11.2 | 12.2 | 6.2 |
| May | 25° / 18° | 333 | 24.7 | 12.5 | 4.2 |
| Jun | 25° / 18° | 390 | 27.3 | 12.6 | 3.8 |
| Jul | 24° / 18° | 267 | 25 | 12.5 | 4.3 |
| Aug | 25° / 18° | 352 | 26.4 | 12.3 | 4.0 |
| Sep | 24° / 17° | 424 | 28.3 | 12.1 | 3.7 |
| Oct | 24° / 17° | 444 | 28.8 | 11.8 | 3.8 |
| Nov | 24° / 17° | 224 | 21.5 | 11.5 | 4.8 |
| Dec | 24° / 17° | 72 | 10.8 | 11.4 | 6.9 |
Cloud cover in September
The sky is clear or mostly clear about 0% of the time in September.
Beyond those clear spells, partly cloudy skies cover about 2% of September, with mostly cloudy or overcast conditions the remaining 98%.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 2 | 3 | 3 | 3 | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| Cloudier (%) | 98 | 97 | 97 | 97 | 97 | 97 | 97 | 98 | 98 | 98 | 98 | 98 | 98 | 98 | 98 | 98 | 98 | 98 | 98 | 98 | 98 | 98 | 98 | 98 | 98 | 98 | 98 | 98 | 98 | 98 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 2 | 98 |
| 2 | 3 | 97 |
| 3 | 3 | 97 |
| 4 | 3 | 97 |
| 5 | 3 | 97 |
| 6 | 3 | 97 |
| 7 | 3 | 97 |
| 8 | 2 | 98 |
| 9 | 2 | 98 |
| 10 | 2 | 98 |
| 11 | 2 | 98 |
| 12 | 2 | 98 |
| 13 | 2 | 98 |
| 14 | 2 | 98 |
| 15 | 2 | 98 |
| 16 | 2 | 98 |
| 17 | 2 | 98 |
| 18 | 2 | 98 |
| 19 | 2 | 98 |
| 20 | 2 | 98 |
| 21 | 2 | 98 |
| 22 | 2 | 98 |
| 23 | 2 | 98 |
| 24 | 2 | 98 |
| 25 | 2 | 98 |
| 26 | 2 | 98 |
| 27 | 2 | 98 |
| 28 | 2 | 98 |
| 29 | 2 | 98 |
| 30 | 2 | 98 |
Chance of precipitation in September
Alajuela gets around 424 mm of rain over 28.3 wet days in September. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 95% and peaks near 97% on the wettest days.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 91 | 91 | 91 | 92 | 92 | 92 | 92 | 93 | 93 | 93 | 94 | 94 | 94 | 95 | 95 | 95 | 96 | 96 | 96 | 96 | 97 | 97 | 97 | 97 | 97 | 97 | 97 | 96 | 96 | 96 |
| Rain chance (%) | |
|---|---|
| 1 | 91 |
| 2 | 91 |
| 3 | 91 |
| 4 | 92 |
| 5 | 92 |
| 6 | 92 |
| 7 | 92 |
| 8 | 93 |
| 9 | 93 |
| 10 | 93 |
| 11 | 94 |
| 12 | 94 |
| 13 | 94 |
| 14 | 95 |
| 15 | 95 |
| 16 | 95 |
| 17 | 96 |
| 18 | 96 |
| 19 | 96 |
| 20 | 96 |
| 21 | 97 |
| 22 | 97 |
| 23 | 97 |
| 24 | 97 |
| 25 | 97 |
| 26 | 97 |
| 27 | 97 |
| 28 | 96 |
| 29 | 96 |
| 30 | 96 |
Humidity in September
Most of September feels humid — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, September lands in the humid band about 57% of days. Sticky, muggy-or-worse air turns up on roughly 43% of them.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Humid (%) | 60 | 60 | 60 | 60 | 60 | 60 | 59 | 59 | 58 | 57 | 57 | 56 | 55 | 55 | 55 | 54 | 54 | 54 | 54 | 54 | 55 | 55 | 55 | 56 | 56 | 56 | 56 | 56 | 57 | 57 |
| Muggy (%) | 40 | 40 | 40 | 40 | 40 | 40 | 41 | 41 | 42 | 43 | 43 | 44 | 45 | 45 | 45 | 46 | 46 | 46 | 46 | 46 | 45 | 45 | 45 | 44 | 44 | 44 | 44 | 44 | 43 | 43 |
| Humid (%) | Muggy (%) | |
|---|---|---|
| 1 | 60 | 40 |
| 2 | 60 | 40 |
| 3 | 60 | 40 |
| 4 | 60 | 40 |
| 5 | 60 | 40 |
| 6 | 60 | 40 |
| 7 | 59 | 41 |
| 8 | 59 | 41 |
| 9 | 58 | 42 |
| 10 | 57 | 43 |
| 11 | 57 | 43 |
| 12 | 56 | 44 |
| 13 | 55 | 45 |
| 14 | 55 | 45 |
| 15 | 55 | 45 |
| 16 | 54 | 46 |
| 17 | 54 | 46 |
| 18 | 54 | 46 |
| 19 | 54 | 46 |
| 20 | 54 | 46 |
| 21 | 55 | 45 |
| 22 | 55 | 45 |
| 23 | 55 | 45 |
| 24 | 56 | 44 |
| 25 | 56 | 44 |
| 26 | 56 | 44 |
| 27 | 56 | 44 |
| 28 | 56 | 44 |
| 29 | 57 | 43 |
| 30 | 57 | 43 |
Wind in September
Winds average 4 km/h in September, the calmest month.
Across September, daily wind ranges from about 4 km/h on the calmest days to 4 km/h at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 4 | calm |
| 2 | 4 | calm |
| 3 | 4 | calm |
| 4 | 4 | calm |
| 5 | 4 | calm |
| 6 | 4 | calm |
| 7 | 4 | calm |
| 8 | 4 | calm |
| 9 | 4 | calm |
| 10 | 4 | calm |
| 11 | 4 | calm |
| 12 | 4 | calm |
| 13 | 4 | calm |
| 14 | 4 | calm |
| 15 | 4 | calm |
| 16 | 4 | calm |
| 17 | 4 | calm |
| 18 | 4 | calm |
| 19 | 4 | calm |
| 20 | 4 | calm |
| 21 | 4 | calm |
| 22 | 4 | calm |
| 23 | 4 | calm |
| 24 | 4 | calm |
| 25 | 4 | calm |
| 26 | 4 | calm |
| 27 | 4 | calm |
| 28 | 4 | calm |
| 29 | 4 | calm |
| 30 | 4 | calm |
Sunrise & sunset in September
Daylight runs from about 12 h 12 min at the start of September to 11 h 54 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 18 minutes over September. Sunrise moves from 5:31 AM to 5:29 AM, and sunset from 5:42 PM to 5:24 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 12.2 | 12.2 | 12.2 | 12.2 | 12.2 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 11.9 | 11.9 | 11.9 |
| Sunrise (AM) | 5:31 | 5:31 | 5:31 | 5:31 | 5:30 | 5:30 | 5:30 | 5:30 | 5:30 | 5:30 | 5:30 | 5:30 | 5:30 | 5:30 | 5:30 | 5:30 | 5:29 | 5:29 | 5:29 | 5:29 | 5:29 | 5:29 | 5:29 | 5:29 | 5:29 | 5:29 | 5:29 | 5:29 | 5:29 | 5:29 |
| Sunset (PM) | 5:42 | 5:42 | 5:41 | 5:41 | 5:40 | 5:39 | 5:39 | 5:38 | 5:37 | 5:37 | 5:36 | 5:35 | 5:35 | 5:34 | 5:33 | 5:33 | 5:32 | 5:31 | 5:31 | 5:30 | 5:30 | 5:29 | 5:28 | 5:28 | 5:27 | 5:26 | 5:26 | 5:25 | 5:24 | 5:24 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.2 | 5:31 | 5:42 |
| 2 | 12.2 | 5:31 | 5:42 |
| 3 | 12.2 | 5:31 | 5:41 |
| 4 | 12.2 | 5:31 | 5:41 |
| 5 | 12.2 | 5:30 | 5:40 |
| 6 | 12.1 | 5:30 | 5:39 |
| 7 | 12.1 | 5:30 | 5:39 |
| 8 | 12.1 | 5:30 | 5:38 |
| 9 | 12.1 | 5:30 | 5:37 |
| 10 | 12.1 | 5:30 | 5:37 |
| 11 | 12.1 | 5:30 | 5:36 |
| 12 | 12.1 | 5:30 | 5:35 |
| 13 | 12.1 | 5:30 | 5:35 |
| 14 | 12.1 | 5:30 | 5:34 |
| 15 | 12.1 | 5:30 | 5:33 |
| 16 | 12.1 | 5:30 | 5:33 |
| 17 | 12.0 | 5:29 | 5:32 |
| 18 | 12.0 | 5:29 | 5:31 |
| 19 | 12.0 | 5:29 | 5:31 |
| 20 | 12.0 | 5:29 | 5:30 |
| 21 | 12.0 | 5:29 | 5:30 |
| 22 | 12.0 | 5:29 | 5:29 |
| 23 | 12.0 | 5:29 | 5:28 |
| 24 | 12.0 | 5:29 | 5:28 |
| 25 | 12.0 | 5:29 | 5:27 |
| 26 | 12.0 | 5:29 | 5:26 |
| 27 | 12.0 | 5:29 | 5:26 |
| 28 | 11.9 | 5:29 | 5:25 |
| 29 | 11.9 | 5:29 | 5:24 |
| 30 | 11.9 | 5:29 | 5:24 |
Solar energy in September
Average shortwave solar energy reaching the ground each day in September, about 4.28 kWh/m².
For context, solar energy here swings from a low near 3.65 kWh/m² to a high of 5.95 kWh/m² in March across the year — September's 4.28 kWh/m² falls in the middle.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.4 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.3 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.1 | 4.1 | 4.1 | 4.1 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 4.4 | Bright |
| 2 | 4.4 | Bright |
| 3 | 4.4 | Bright |
| 4 | 4.4 | Bright |
| 5 | 4.4 | Bright |
| 6 | 4.4 | Bright |
| 7 | 4.4 | Bright |
| 8 | 4.3 | Bright |
| 9 | 4.3 | Bright |
| 10 | 4.3 | Bright |
| 11 | 4.3 | Bright |
| 12 | 4.3 | Bright |
| 13 | 4.3 | Bright |
| 14 | 4.3 | Bright |
| 15 | 4.3 | Bright |
| 16 | 4.3 | Bright |
| 17 | 4.3 | Bright |
| 18 | 4.2 | Bright |
| 19 | 4.2 | Bright |
| 20 | 4.2 | Bright |
| 21 | 4.2 | Bright |
| 22 | 4.2 | Bright |
| 23 | 4.2 | Bright |
| 24 | 4.2 | Bright |
| 25 | 4.2 | Bright |
| 26 | 4.2 | Bright |
| 27 | 4.1 | Bright |
| 28 | 4.1 | Bright |
| 29 | 4.1 | Bright |
| 30 | 4.1 | Bright |
Hazard calendar for Alajuela
In September, Alajuela sits inside its rainy season season. The full year is below, with each hazard's peak months called out.
Alajuela's rainy season runs May–November, when most of the year's rain falls.
Is September a good time to visit Alajuela?
Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
September is a weaker month for outdoor sightseeing in Alajuela.
What to pack for Alajuela in September
From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In September, Alajuela sees daytime highs around 24°C and nights near 17°C. Pack rain gear. Worth having: light clothes. About 28 days see rain.
Sea temperature near Alajuela in September
The nearest coast averages about 29°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 48 km away) is warmest in April at about 29°C and coldest in November near 28°C.
The water stays above 20°C all year — warm enough for a swim any month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 28 | 28 | 28 |
| Comfort | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Warm | Tropical |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 29 | Tropical |
| Feb | 29 | Tropical |
| Mar | 29 | Tropical |
| Apr | 29 | Tropical |
| May | 29 | Tropical |
| Jun | 29 | Tropical |
| Jul | 29 | Tropical |
| Aug | 29 | Tropical |
| Sep | 29 | Tropical |
| Oct | 28 | Tropical |
| Nov | 28 | Warm |
| Dec | 28 | Tropical |
UV index in Alajuela in September
Clear-sky midday UV in September peaks around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Alajuela peaks around February 22 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 17 at about 10 (very high).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 11 | 14 | 14 | 14 | 12 | 13 | 12 | 12 | 12 | 12 | 11 | 10 |
| Level | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 11 | Extreme |
| Feb | 14 | Extreme |
| Mar | 14 | Extreme |
| Apr | 14 | Extreme |
| May | 12 | Extreme |
| Jun | 13 | Extreme |
| Jul | 12 | Extreme |
| Aug | 12 | Extreme |
| Sep | 12 | Extreme |
| Oct | 12 | Extreme |
| Nov | 11 | Extreme |
| Dec | 10 | Very high |
Air quality in Alajuela in September
Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.
Air quality in Alajuela is worst in May — around 19 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (January, 9 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 9 | 10 | 11 | 17 | 19 | 17 | 18 | 17 | 16 | 14 | 12 | 10 |
| Level | Good | Good | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 9 | Good |
| Feb | 10 | Good |
| Mar | 11 | Good |
| Apr | 17 | Moderate |
| May | 19 | Moderate |
| Jun | 17 | Moderate |
| Jul | 18 | Moderate |
| Aug | 17 | Moderate |
| Sep | 16 | Moderate |
| Oct | 14 | Moderate |
| Nov | 12 | Good |
| Dec | 10 | Good |
Where is Alajuela?
Alajuela sits at 10.0°N, 84.2°W, 955 m above sea level, in Costa Rica. The nearest listed city is Mercedes Norte, 9.0 km away.
Topography around Alajuela
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Alajuela.
Within 3 km, the terrain around Alajuela has only modest variations in elevation — a maximum elevation change of 200 m around an average of 945 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 2,297 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,470 m.
The land around Alajuela is covered by artificial surfaces (48%) and trees (32%) within 3 km, trees (56%), grassland (23%) and artificial surfaces (20%) within 16 km, and trees (68%) within 80 km.
Costa Rica travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 59% of US
- price level, 2025
- GDP per capita
- $19,970
- 2025
- Happiness
- 7.4 / 10
- World Happiness, 2025
- Safe drinking water
- 81%
- of population, 2024
- Homicide rate
- 17.7
- per 100k, 2023
- Road deaths
- 14.8
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- Moderate
- EF EPI 516
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Alajuela (10.0172°, -84.2127°, elevation 955 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).