Costa Rica in september: average Weather, Temperature and Climate, Where to go?
Weather in Costa Rica in september 2025
In this section, check out the weather forecast for september for most popular cities in Costa Rica. These datas are probabilities for september from weather reports for over 10 years. The percentage indicates the possibility of having the weather indicated.
Average weather in september in San José
very bad weather
Weather at 6am
63°F
Moderate rain at times
30% of time
27%
15%
15%
Weather at 12pm
76°F
Moderate rain at times
48% of time
40%
6%
4%
Weather at 6pm
68°F
Heavy rain
85% of time
12%
3%
2%
Weather at 3am
63°F
38%
26%
17%
13%
Where to go in Costa Rica in september?
Where to go in Costa Rica in september: destination map
Where to go in each region in september?
| Caribbean coast of Costa Rica (Tortuguero, Puerto Limón, Manzanillo...) | 77°F to 88°F | 8 à 29 days | 86°F | good weather |
| Central valley (San José, San Isidro, Cartago...) | 74°F to 88°F | 12 à 29 days | very bad weather* | |
| North of Costa Rica (La Fortuna, Quesada, Boca San Carlos...) | 77°F to 88°F | 22 à 28 days | very bad weather* | |
| Pacific coast of Costa Rica (Montezuma, Puntarenas, Puerto Jiménez...) | 77°F to 88°F | 19 à 29 days | 85°F | very bad weather* |
| Provincia Guanacaste (Tamarindo, La Cruz, Liberia (Guanacaste)...) | 86°F to 88°F | 16 à 27 days | 85°F to 86°F | very bad weather* |
Where should you go in Costa Rica in september when it comes to the weather?
Remember:
The climate in Costa Rica in september ranges from good to very bad depending on the region and city.
Climate conditions throughout the Costa Rican territory are characterized by the abundance of rain and the permanent presence of heat. Prepare to have rainy days because the climate in Costa Rica throughout September is far from pleasant, despite the slight decrease in precipitation.
Costa Rican East Coast in September
Compared to the abundance of rain in other parts of the country, the rainfall on the Caribbean coast is acceptable. Only due to the rise of heat, scorching middays succeed the comfortable mornings. It will then be necessary to arrange to stay away from the sun, at the most uncomfortable hours of the day.
The Center of Costa Rica in September
The central plateau is the most wet in Costa Rica. Beginning at daybreak, expect rainfall events that can range from moderately intense to very intense. Even if the temperatures are lower compared to those on the coasts, the weather in Costa Rica throughout September is far from pleasant.
The West Coast of Costa Rica in September
Depending on the geographical location of the cities, the heat can be pleasant or unbearable. Maximum temperatures range from 24° C to 32° C. Either way, the heavy rains rarely provide the opportunity to enjoy sunny days.
Climate in Costa Rica in september
Climate in San José in september
In the month of september, maximum temperature is 77°F and minimum temperature is 63°F (for an average temperature of 70°F). The climate quite good there in this month. With 33.5in over 28 days, you may find yourself often in the rain during your journey. Consider to bring Rain coats.
| September | |||
| Average temperature | 70°F | ||
| Highest temperature | 77°F | ||
| Lowest temperature | 63°F | ||
| Rainfall | 33.5in | ||
| Number of days with rainfall | 28 day(s) (95%) | ||
| Humidity | 95% | ||
| Daily sunshine hours | 10 | ||
| Cloud cover | 63% | ||
| Length of day | 12:11 | ||
| Our opinion at whereandwhen.net | very bad |
Climate in La Cruz in september
In september, maximum temperature is 88°F and minimum temperature is 79°F (for an average temperature of 83°F). The climate is burning in that locality in september. With 9.2in over 16 days, you will suffer the rain for your holidays. Remember to pack rain clothes.
With proper weather, the month of september is okay (but not the best month) for traveling in that area.
| September | |||
| Average temperature | 83°F | ||
| Highest temperature | 88°F | ||
| Lowest temperature | 79°F | ||
| Sea temperature | 85°F | ||
| Rainfall | 9.2in | ||
| Number of days with rainfall | 16 day(s) (54%) | ||
| Humidity | 87% | ||
| Daily sunshine hours | 11 | ||
| Cloud cover | 43% | ||
| Length of day | 12:11 | ||
| Our opinion at whereandwhen.net | tolerable |
Climate in Montezuma in september
In september, the mean temperature in Montezuma is 81°F (maximum temperature is 86°F and minimum temperature is 77°F). The climate is very warm there in the month of september. With 19.7in over 25 days, rain is to be feared during your stay. So remember to bring clothes for rain.
| September | |||
| Average temperature | 81°F | ||
| Highest temperature | 86°F | ||
| Lowest temperature | 77°F | ||
| Sea temperature | 84°F | ||
| Rainfall | 19.7in | ||
| Number of days with rainfall | 25 day(s) (85%) | ||
| Humidity | 89% | ||
| Daily sunshine hours | 11 | ||
| Cloud cover | 44% | ||
| Length of day | 12:11 | ||
| Our opinion at whereandwhen.net | bad |
Climate in Puerto Limón in september
In september, maximum temperature is 88°F and minimum temperature is 79°F (for an average temperature of 83°F). The climate is very hot in that locality in the month of september. With just 8.5in over 12 days, rain may be scarce throughout your stay.
With a bad weather, september is not the best time to go in this city.
| September | |||
| Average temperature | 83°F | ||
| Highest temperature | 88°F | ||
| Lowest temperature | 79°F | ||
| Sea temperature | 85°F | ||
| Rainfall | 8.5in | ||
| Number of days with rainfall | 12 day(s) (39%) | ||
| Humidity | 75% | ||
| Daily sunshine hours | 11 | ||
| Cloud cover | 33% | ||
| Length of day | 12:11 | ||
| Our opinion at whereandwhen.net | good |
Climate in Puntarenas in september
In the month of september, maximum temperature is 88°F and minimum temperature is 77°F (for an average temperature of 83°F). The climate is very hot in that locality in september. With 20.1in over 25 days, rain is to be feared for your trip. Consider to bring adapted clothes.
| September | |||
| Average temperature | 83°F | ||
| Highest temperature | 88°F | ||
| Lowest temperature | 77°F | ||
| Sea temperature | 84°F | ||
| Rainfall | 20.1in | ||
| Number of days with rainfall | 25 day(s) (85%) | ||
| Humidity | 87% | ||
| Daily sunshine hours | 11 | ||
| Cloud cover | 44% | ||
| Length of day | 12:11 | ||
| Our opinion at whereandwhen.net | very bad |
All cities in Costa Rica in september
| San José in september | very bad weather |
| La Cruz in september | tolerable weather |
| Montezuma in september | bad weather |
| Puerto Limón in september | good weather |
| Puntarenas in september | very bad weather |
| Tamarindo in september | tolerable weather |
| Tortuguero in september | good weather |
| Boca San Carlos in september | bad weather |
| Cartago in september | very bad weather |
| La Fortuna in september | bad weather |
| Liberia (Guanacaste) in september | bad weather |
| Manzanillo in september | good weather |
| Puerto Jiménez in september | very bad weather |
| Quesada in september | very bad weather |
| San Isidro in september | very bad weather |
| Alajuela in september | very bad weather |
| Bananito Sur in september | good weather |
| Cerro Chirripo in september | very bad weather |
| Dominical in september | very bad weather |
| Escazu in september | very bad weather |
| Esterillos in september | tolerable weather |
| Golfito in september | very bad weather |
Weather data for Costa Rica in september:
Weather data for Costa Rica in september is derived from an average of the weather forecast since 2009 in Costa Rica. There is a margin of error and these forecasts are to be considered as general information only. The weather in Costa Rica can vary slightly from year to year, but these predictions should limit surprises. So you can pack your bags and check when is the best time to go to Costa Rica.