September Rainfall Averages for Costa Rica
The tables below give September averages for rainfall at cities and other locations in Costa Rica. Each place has a total for how many days of wet weather it usually gets this month and for the normal amount of precipitation.
You can jump to a separate table for each region of the country: North – Central Costa Rica covering the provinces of Alajuela and Heredia, Western Costa Rica comprising Puntarenas and Guanacaste provinces, and Central & Eastern Costa Rica taking in San José, Cartago and Limón provinces.
The precipitation amounts are averages of weather data collected over many years.
North – Central Costa Rica
| Days | Place | Inches | Millimetres |
|---|---|---|---|
| 25 | Alajuela | 12.5 | 317 |
| 25 | Barva | 16.6 | 422 |
| – | Heredia | 15.6 | 397 |
| 24 | Los Chiles | 7.6 | 194 |
| 23 | Quesada | 13.1 | 333 |
| 24 | Upala | 10.9 | 277 |
Western Costa Rica
| Days | Place | Inches | Millimetres |
|---|---|---|---|
| 25 | Buenos Aires | 20.0 | 508 |
| – | Cañas | 12.1 | 308 |
| – | Filadelfia | 13.8 | 351 |
| 20 | Liberia | 14.2 | 362 |
| 25 | Nicoya | 13.8 | 351 |
| 20 | Puntarenas | 9.1 | 231 |
| 26 | Quepos | 21.3 | 542 |
| 25 | Río Claro | 24.6 | 625 |
Central & Eastern Costa Rica
| Days | Place | Inches | Millimetres |
|---|---|---|---|
| 24 | Cartago | 8.3 | 210 |
| 23 | Guapiles | 14.8 | 376 |
| 14 | Limón | 5.6 | 142 |
| – | San Isidro | 16.5 | 420 |
| 23 | San José | 12.4 | 315 |
| – | Sixaola | 5.4 | 137 |
| – | Turrialba | 9.9 | 252 |
Reference
Instituto Meteorológico Nacional De Costa Rica. Climatic Data..
World Meteorological Organization. World Weather Information Service. Costa Rica.