Guanacaste Weather in September

Average temperatures, rainfall, sunshine and the best places to visit in Guanacaste, Costa Rica in September.

Considering a trip to Guanacaste, Costa Rica this September and wondering about the expected weather conditions? Find all the crucial information you need right here, addressing your question:

What to Expect in Guanacaste in September

Guanacaste, Costa Rica is a region in Costa Rica. September in Guanacaste generally has temperatures that range from warm to very warm, with heavy precipitation.

Temperatures

The average maximum daytime temperatures vary from warm in Puerto Coyote at 29°C (84°F) to very warm in Nicoya at 31°C (88°F). Nighttime temperatures generally drop to 23°C (73°F) in Nicoya and 25°C (77°F) in Puerto Coyote. The temperatures cited for both day and night represent usual averages, but it's possible some days could be hotter. It's advisable to dress accordingly to handle the heat.

To learn more about the conditions in specific areas of Guanacaste, Costa Rica, check out the map below.

Precipitation

In September, precipitation varies across different areas. From heavy rainfall in Puerto Soley with an average of 277 mm (11 in) to heavy rainfall in Sámara with 436 mm (17 in).

Average sunshine

Sunshine is fairly consistent across many areas. Tamarindo receives about 158 hours of sunlight in September, providing a good balance between sunny spells and cloud cover. If you're after more sunshine hours, take a look at our weather planner for other sun-rich destinations worldwide.

Explore Guanacaste by month

Best Places to Visit in Guanacaste in September

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across Guanacaste.

perfect weather
pleasant
tolerable
unpleasant
poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).

Popular Destinations in Guanacaste

What is the weather like in September for some of the most popular destinations in Guanacaste, Costa Rica?

Temperature range in Guanacaste (September)

Precipitation variation in Guanacaste (September)

Tamarindo

In September Tamarindo generally has very high temperatures with maximum daytime temperatures around 30°C (86°F), minimum nighttime temperatures around 25°C (77°F) and heavy monthly rainfall. So on average the conditions are poor that month.

August
September
October
Max temperature
31°C (88°F)
30°C (86°F)
30°C (86°F)
Min temperature
25°C (77°F)
25°C (77°F)
25°C (77°F)
Monthly sun hours
183 hours
158 hours
171 hours
Monthly rainfall
250 mm (9.8 in)
331 mm (13 in)
354 mm (14 in)
Monthly rainy days
21 days
23 days
21 days
Weather conditions

Coco

In September Coco generally has high temperatures with maximum daytime temperatures around 30°C (86°F), minimum nighttime temperatures around 25°C (77°F) and heavy monthly rainfall. So on average the conditions are poor that month.

August
September
October
Max temperature
31°C (88°F)
30°C (86°F)
30°C (86°F)
Min temperature
25°C (77°F)
25°C (77°F)
25°C (77°F)
Monthly sun hours
183 hours
158 hours
171 hours
Monthly rainfall
181 mm (7.1 in)
286 mm (11 in)
328 mm (13 in)
Monthly rainy days
21 days
23 days
21 days
Weather conditions

Playa Flamingo

In September Playa Flamingo generally has high temperatures with maximum daytime temperatures around 30°C (86°F), minimum nighttime temperatures around 25°C (77°F) and heavy monthly rainfall. So on average the conditions are poor that month.

August
September
October
Max temperature
31°C (88°F)
30°C (86°F)
30°C (86°F)
Min temperature
25°C (77°F)
25°C (77°F)
25°C (77°F)
Monthly sun hours
183 hours
158 hours
171 hours
Monthly rainfall
206 mm (8.1 in)
296 mm (12 in)
335 mm (13 in)
Monthly rainy days
21 days
23 days
21 days
Weather conditions

Sámara

In September Sámara generally has high temperatures with maximum daytime temperatures around 29°C (84°F), minimum nighttime temperatures around 24°C (75°F) and heavy monthly rainfall. So on average the conditions are poor that month.

August
September
October
Max temperature
30°C (86°F)
29°C (84°F)
29°C (84°F)
Min temperature
24°C (75°F)
24°C (75°F)
24°C (75°F)
Monthly rainfall
382 mm (15 in)
436 mm (17 in)
469 mm (18 in)
Monthly rainy days
21 days
23 days
21 days
Weather conditions

Playa Grande

In September Playa Grande generally has very high temperatures with maximum daytime temperatures around 30°C (86°F), minimum nighttime temperatures around 25°C (77°F) and heavy monthly rainfall. So on average the conditions are poor that month.

August
September
October
Max temperature
31°C (88°F)
30°C (86°F)
30°C (86°F)
Min temperature
25°C (77°F)
25°C (77°F)
25°C (77°F)
Monthly sun hours
183 hours
158 hours
171 hours
Monthly rainfall
241 mm (9.5 in)
324 mm (13 in)
351 mm (14 in)
Monthly rainy days
21 days
23 days
21 days
Weather conditions

Is your destination not in the list? Have a look at all destinations in Guanacaste, in Costa Rica.

Popular cities in September

Day & night temperatures, rainfall and average weather in Guanacaste in September.

City Weather Day temp Night temp Rainfall
Tamarindo 30°C (86°F) 25°C (77°F) 331 mm (13 in)
Coco 30°C (86°F) 25°C (77°F) 286 mm (11 in)
Playa Flamingo 30°C (86°F) 25°C (77°F) 296 mm (12 in)
Sámara 29°C (84°F) 24°C (75°F) 436 mm (17 in)
Playa Grande 30°C (86°F) 25°C (77°F) 324 mm (13 in)
Nosara 29°C (84°F) 24°C (75°F) 433 mm (17 in)

Guanacaste weather in September: frequently asked questions

What is the weather like in Guanacaste, Costa Rica in September?

September in Guanacaste, Costa Rica brings poor weather. In Tamarindo, daytime temperatures are typically around 30°C (86°F) and nighttime lows hover near 25°C (77°F).

What is the average temperature in Guanacaste, Costa Rica in September?

Average temperatures in Guanacaste, Costa Rica during September range from a nighttime low near 25°C (77°F) to a daytime high around 30°C (86°F) in Tamarindo.

Does Guanacaste, Costa Rica get a lot of rain in September?

Expect plenty of rainfall. Tamarindo records an average of 331 mm (13 in) in September, putting it among the wetter months for Guanacaste, Costa Rica.

Is September a Good Time to Visit Guanacaste, Costa Rica?

In our view, September might not be the best time to travel to Guanacaste, Costa Rica with often poor weather in Tamarindo.

Generally speaking, January and December provide pleasant weather in Tamarindo. In contrast, May, June, July, August, September and October tend to have poor weather conditions.

Interested in more climate information?

We have much more information about the climate in Guanacaste.

Weather and climate has detailed information for every country in the world. Are you going to Costa Rica? Get detailed historical weather averages for many cities in Costa Rica.

Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.

Bucket list

Need travel inspiration? Check out our bucket list articles and be inspired.