San Isidro in september: average Weather, Temperature and Climate
Weather in San Isidro in september 2025
The weather in San Isidro in september comes from statistical datas on the past years. You can view the weather statistics for the whole 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
Weather at 6am
70°F
Moderate rain at times
60% of time
17%
13%
9%
Weather at 12pm
77°F
Moderate rain at times
55% of time
35%
6%
4%
Weather at 6pm
61°F
Heavy rain
83% of time
12%
3%
3%
Weather at 3am
59°F
57%
16%
13%
11%
Evolution of daily average temperature and precipitation in San Isidro in september
These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in San Isidro in september.
The climate of San Isidro in september is very bad
The weather in september in San Isidro is wet (with 34.6in of precipitation over 29 days). It should be noted a worsening from the previous month since in august there is an average of 35in of precipitation over 30 days.
The climate quite pleasant in that area this month. Temperatures are up to 77°F. The seasonal minimum is 67°F. Thus, the mean temperature average in september in San Isidro is 72°F. Note that seasonal normals in contrast with those observed in San Isidro in september with a maximum record of 83°F in 2009 and a minimum record of 54°F in 2016.
Day length in San Isidro in september is 12:10. Sunrise is at 05:25 and sets at 17:35.
September: another location in Costa Rica?
If you want to go to Costa Rica in september, there are destinations with better weather than San Isidro:
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 San Isidro.
Seasonal average climate and temperature of San Isidro in september
Check below seasonal norms These datas are generated from the weather statements of the past years of september.
| September | |||||
| Outside temperature | |||||
| Average temperature | 72°F | ||||
| Highest temperature | 77°F | ||||
| Lowest temperature | 67°F | ||||
| Highest record temperature | 83°F (2009) | ||||
| Lowest record temperature | 54°F (2016) | ||||
| Number of days at +65°F | 30 day(s) (100%) | ||||
| Wind | |||||
| Wind speed | 6km/h | ||||
| Wind temperature | 67°F | ||||
| Precipitation (rainfall) | |||||
| Rainfall | 34.6in | ||||
| Number of days with rainfall | 29 day(s) (96%) | ||||
| Record daily rainfall | 6.4in (2009) | ||||
| Other climate data | |||||
| Humidity | 93% | ||||
| Visibility | 7.67km | ||||
| Cloud cover | 56% | ||||
| UV index | 5 | ||||
| Daily sunshine hours | 10 | ||||
| Sunrise and sunset | |||||
| Time of sunrise | 05:25 | ||||
| Time of sunset | 17:35 | ||||
| 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 San Isidro in september 2024:
63°F to 76°F
61°F to 76°F
61°F to 76°F
61°F to 77°F
63°F to 77°F
63°F to 77°F
67°F to 76°F
68°F to 76°F
68°F to 77°F
67°F to 77°F
67°F to 77°F
67°F to 77°F
68°F to 79°F
67°F to 77°F
70°F to 79°F
70°F to 79°F
70°F to 79°F
70°F to 77°F
70°F to 77°F
68°F to 76°F
67°F to 74°F
63°F to 68°F
65°F to 76°F
65°F to 74°F
63°F to 68°F
67°F to 79°F
68°F to 76°F
68°F to 77°F
68°F to 74°F
67°F to 74°F
Map: other cities in Costa Rica in september
Cities near San Isidro:
| Dominical in september | very bad weather |
| Uvita in september | very bad weather |
| Cerro Chirripo in september | very bad weather |
| Ojochal in september | very bad weather |
| Parque Nacional Tapantí in september | very bad weather |
| Quepos in september | very bad weather |
| Parque Nacional Manuel Antonio in september | very bad weather |
| Paraiso in september | very bad weather |
| Cartago in september | very bad weather |
| Volcán Irazu in september | very bad weather |
| Parrita in september | very bad weather |
| Tejar in september | very bad weather |
Click over cities on the map for information about the weather in september.
San Isidro
perfect weather
good
tolerable
bad
very bad
Weather data for San Isidro in september:
Weather data for San Isidro for september are derived from an average of the weather forecast since 2009 in San Isidro. There is a margin of error and these forecasts are to be considered as general information only. The weather in San Isidro 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 San Isidro.