Costa Rica weather in September 2025
September
Costa Rica weather in September 2025
September
Day
31 °C
Night
22 °C
Sea
28 °C
Precipitation
294 mm
in month
Rainy days
18 days
in month
Daylight
12 hours
average
Sunshine
5 hours
average
Humidity
87 %
Day
31 °C
Night
22 °C
Sea
28 °C
Precipitation
294 mm
in month
Rainy days
18 days
in month
Daylight
12 hours
average
Sunshine
5 hours
average
Humidity
87 %
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Weather overview and FAQs
Weather overview
In September in Costa Rica, the average air temperature ranges from 31 °C (88 °F) during the day to 22 °C (71 °F) at night. There are 18 days of rain on average, where the rainfall is 294 mm (11.58 in).
Is September a good month to visit Costa Rica?
There are good conditions for visiting in Costa Rica in September. The daily temperatures in this month reach pleasant 31 °C (88 °F). The temperature of the sea will be perfect at 28 °C (83 °F). At night, temperatures hover around a pleasant 22 °C (71 °F). September is the wet season month in Costa Rica, which means that there may be more frequent rains during your stay.
What is the sea temperature in Costa Rica in September?
In September in Costa Rica expect the sea to be warm at 28 °C (83 °F). This temperature is someone's dream come true, while for someone it may no longer be ideal for the purpose of refreshment.
What is the temperature in Costa Rica during the day in September?
The average daily temperature in Costa Rica in September is 31 °C (88 °F). The great temperature for lying by the sea or pool and sunbathing, everywhere else you will probably be a bit hot. Don't forget to drink during the day, in these temperatures you should hydrate yourself a lot.
What is the night temperature in September in Costa Rica?
The average night temperature in Costa Rica in September is 22 °C (71 °F). A very pleasant temperature for long evening walks, fun over a drink outside, or doing sports in the morning. If possible, look for a hotel with air conditioning.
How many rainy days can I expect in September in Costa Rica?
In Costa Rica in September, we can expect 18 days to be rainy, that is, days when precipitation exceeds 2 mm (0.08 in). Converted to days of the week, this means that it will occur on an average of 4.3 days of the week, or in general - 61 % days.
How heavy is the precipitation in September in Costa Rica?
There is precipitation of 294 mm (11.58 in) in Costa Rica in September, which means 10 mm (0.39 in) rainfall per day on average.
How many hours of sun to expect in Costa Rica in September?
In September in Costa Rica, you can expect around 5 hours of sunshine.
Is it hot in Costa Rica in September?
In September in Costa Rica, you will enjoy nice warm weather, but it will also be pleasant and you probably won't feel hot.
Is September part of the wet season in Costa Rica?
Yes, in September in Costa Rica there is a wet season with 18 days, when there is rain in a month.
How humid is Costa Rica in September?
In September in Costa Rica, expect humidity around 87 %. This humidity is rather above average, but except for sensitive individuals, it should not be a problem.
How windy is it in September in Costa Rica?
In Costa Rica in September, there will be an average wind scale of 3. It is rather a milder or unnoticeable wind, therefore it will not bother you during your holiday.
How long is the day (from dawn till dusk) in Costa Rica in September?
The length of daylight in Costa Rica in September is 12 hours.
Is Costa Rica rainier in September than in August?
Yes, Costa Rica is a rainier September than in August.
Is the weather in Costa Rica warmer in September than in October?
No, in Costa Rica in September the temperature is not higher than in October.
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