Alajuela in september: average Weather, Temperature and Climate
Weather in Alajuela in september 2025
The weather in Alajuela in september comes from statistical datas on the past years. You can view the weather statistics the entire month, but also by clicking on the tabs for the beginning, the middle and the end of the month.
Average weather throughout september
very bad weather UV index: 6
Weather at 6am
65°F
Moderate rain at times
27% of time
26%
19%
16%
Weather at 12pm
79°F
Moderate rain at times
44% of time
35%
14%
5%
Weather at 6pm
70°F
Heavy rain
86% of time
9%
3%
2%
Weather at 3am
65°F
36%
27%
16%
13%
Evolution of daily average temperature and precipitation in Alajuela in september
These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in Alajuela in september.
The climate of Alajuela in september is very bad
the weather in Alajuela in september is wet (with 31.8in of rainfall over 28 days). The weather is worst than the previous month since in august there is an average of 29.6in of rainfall over 26 days.
The climate quite nice there the month of september. The high seasonal norm is 79°F. The minimum is 65°F. Thus, the mean temperature average on this month of september in Alajuela is 72°F. Note that seasonal normals are in contrast with those observed in Alajuela in the month of september with a maximum record of 85°F in 2012 and a minimum record of 58°F in 2012.
In september in Alajuela, the days on average last 12:10. Sunrise is at 05:27 and sets at 17:37.
September: another location in Costa Rica?
If you want to go to Costa Rica in september, there are destinations with better weather than Alajuela:
In september, Puerto Limón, Tortuguero, Manzanillo, Bananito Sur, Parc international La Amistad and Parismina have good weather.
Finally, La Cruz, Tamarindo, Esterillos, Parque Nacional Carara, Playa Arenillas and Playa Flamingo (Guanacaste) have a tolerable climate, but better than Alajuela.
Seasonal average climate and temperature of Alajuela in september
Check below seasonal norms These statistics are compiled from the weather statements of the past years of september.
| September | |||||
| Outside temperature | |||||
| Average temperature | 72°F | ||||
| Highest temperature | 79°F | ||||
| Lowest temperature | 65°F | ||||
| Highest record temperature | 85°F (2012) | ||||
| Lowest record temperature | 58°F (2012) | ||||
| Number of days at +65°F | 30 day(s) (100%) | ||||
| Wind | |||||
| Wind speed | 7km/h | ||||
| Wind temperature | 65°F | ||||
| Precipitation (rainfall) | |||||
| Rainfall | 31.8in | ||||
| Number of days with rainfall | 28 day(s) (94%) | ||||
| Record daily rainfall | 6in (2009) | ||||
| Other climate data | |||||
| Humidity | 94% | ||||
| Visibility | 6.93km | ||||
| Cloud cover | 58% | ||||
| UV index | 6 | ||||
| Daily sunshine hours | 10 | ||||
| Sunrise and sunset | |||||
| Time of sunrise | 05:27 | ||||
| Time of sunset | 17:37 | ||||
| Length of day | 12:10 | ||||
| Our opinion about the weather in september | |||||
| Our opinion at whereandwhen.net | very bad | ||||
How was the weather last september?
Here is the day by day recorded weather in Alajuela in september 2024:
63°F to 77°F
65°F to 76°F
67°F to 76°F
67°F to 77°F
61°F to 81°F
63°F to 76°F
63°F to 77°F
61°F to 76°F
61°F to 76°F
61°F to 79°F
63°F to 77°F
63°F to 77°F
61°F to 79°F
61°F to 77°F
59°F to 83°F
61°F to 79°F
61°F to 79°F
63°F to 79°F
63°F to 76°F
61°F to 76°F
63°F to 72°F
63°F to 70°F
65°F to 74°F
59°F to 72°F
61°F to 68°F
59°F to 79°F
59°F to 76°F
59°F to 79°F
61°F to 74°F
59°F to 74°F
Map: other cities in Costa Rica in september
Cities near Alajuela:
| Heredia in september | very bad weather |
| Escazu in september | very bad weather |
| San José in september | very bad weather |
| Atenas in september | very bad weather |
| Volcán Poás in september | very bad weather |
| Naranjo in september | very bad weather |
| San Ramon in september | very bad weather |
| Parque Nacional Braulio Carrillo in september | very bad weather |
| Tejar in september | very bad weather |
| Parque Nacional Juan Castro Blanco in september | very bad weather |
| Desamparados in september | very bad weather |
| Orotina in september | very bad weather |
Click over cities on the map for information about the weather in september.
Alajuela
perfect weather
good
tolerable
bad
very bad
Weather data for Alajuela in september:
Weather data for Alajuela for september are derived from an average of the weather forecast since 2009 in Alajuela. There is a margin of error and these forecasts are to be considered as general information only. The weather in Alajuela can vary slightly from year to year, but this data should limit surprises. So you can pack your bags or check for the best time in year to go to Alajuela.