Weather in Guanacaste Region, Costa Rica in September

Search

Best
Best
Best
Best
Tan
Tan
Tan
Tan
Tan
Tan
Tan
Tan
Tan
Tan
Tan
Tan
Sea
28°
Swim
Sea
28°
Swim
Sea
29°
Swim
Sea
29°
Swim
Sea
28°
Swim
Sea
28°
Swim
Sea
27°
Swim
Sea
27°
Swim
Sea
24°
Swim
Sea
25°
Swim
Sea
25°
Swim
Sea
26°
Swim

Visiting Guanacaste Region, Costa Rica in September

The weather in September is marginally cooler than the previous month and temperatures continue to drop slightly into October. September has average maximum temperatures of 31°C (88°F) which is very hot and perfect for sunbathing on clear days. The sunshine percentage is 42.7% making it quite sunny but with regular periods of cloudy and overcast skies. There are 5.2 hours of sunshine per day. It is not an optimal time for sunbathing but it is possible on clearer days in Guanacaste Region.

September has total rainfall of 21.9cm (8.6inches) making it quite rainy but mostly with moderate tropical showers. There are 19.4 days with some rainfall so you can still enjoy the beach on the clear days.

Sea temperatures are a warm 24°C (74°F). September is a good month for swimming in Guanacaste Region with comfortable temperatures for most people. The sea temperature in September is noticeably cooler than the previous month.

Consider visiting Guanacaste Region in the months of January, February, March, December, for the best beach weather. Also consider one of our other suggestions for September.

Can you sunbathe in Guanacaste Region in September?

Yes, September is not an optimal time for sunbathing but it is possible on clearer days in Guanacaste Region.

September has average maximum temperatures of 31°C (88°F) which is very hot and perfect for sunbathing on clear days. The sunshine percentage is 42.7% making it quite sunny but with regular periods of cloudy and overcast skies. There are 5.2 hours of sunshine per day. September has total rainfall of 21.9cm (8.6inches) making it quite rainy but mostly with moderate tropical showers. There are 19.4 days with some rainfall so you can still enjoy the beach on the clear days.

More about September temperature and sunshine.

Can you swim in Guanacaste Region in September?

Yes, September is a good month for swimming in Guanacaste Region with warm sea temperatures 24°C (74°F).

More about September sea temperatures.

Is September a good time to holiday in Guanacaste Region?

Yes, September is a good time for a holiday in Guanacaste Region.

September has average maximum temperatures of 31°C (88°F) which is very hot and perfect for sunbathing on clear days. The sunshine percentage is 42.7% making it quite sunny but with regular periods of cloudy and overcast skies. There are 5.2 hours of sunshine per day. September has total rainfall of 21.9cm (8.6inches) making it quite rainy but mostly with moderate tropical showers. There are 19.4 days with some rainfall so you can still enjoy the beach on the clear days. It is not an optimal time for sunbathing but it is possible on clearer days in Guanacaste Region. Sea temperatures are a warm 24°C (74°F). September is a good month for swimming in Guanacaste Region with comfortable temperatures for most people.

More about the September temperatures and sunshine.

Is Guanacaste Region warm in September?

Yes, Guanacaste Region is very hot and perfect for sunbathing on clear days in September.

The average maximum temperature in Guanacaste Region in September is 31°C (88°F). The average maximum temperature is 32°C (89°) in the previous month and 30°C (86°F) in the next month.

The average temperature in Guanacaste Region in September is 27°C (80°F). The average temperature is 27°C (81°F) in the previous month and 26°C (80°F) in the next month.

More info about the September temperatures and sunshine.

How sunny is Guanacaste Region in September?

The average day light hours per day in Guanacaste Region in September are 12.2. The sunshine percentage is 42.7% making it quite sunny but with regular periods of cloudy and overcast skies. There are 5.2 hours of sunshine per day.

More about September sunshine.

Temperature in Guanacaste Region in September

The weather in September is marginally cooler than the previous month and temperatures continue to drop slightly into October. The average maximum temperature in Guanacaste Region in September is 31°C (88°F). The average maximum temperature is 32°C (89°F) in the previous month and 30°C (86°F) in the next month.

The average temperature in Guanacaste Region in September is 27°C (80°F). The average temperature is 27°C (81°F) in the previous month and 26°C (80°F) in the next month.

The average minimum temperature in Guanacaste Region in September is 23°C (73°F). The minimum temperature is 23°C (74°F) in the previous month and 23°C (73°F) in the next month.

Sunshine in Guanacaste Region in September

The days in September are marginally shorter than the previous month and days continue to get marginally shorter into October. September has fewer hours of sunshine than the previous month and hours of sunshine continue to drop slightly into October. During September the average day light hours are 12.2 per day in Guanacaste Region. The sunshine percentage is 42.7% making it quite sunny but with regular periods of cloudy and overcast skies. There are 5.2 hours of sunshine per day.

The ultraviolet index in Guanacaste Region in September is typically 13.6 during September. An ultraviolet index reading above 11 indicates an extreme risk of harm from unprotected sun exposure. Unprotected skin risks burning in less than 10 minutes. Take all precautions because unprotected skin and eyes can burn in minutes. Tanning will be safest before 10am and after 4pm but only with a good application of sun screen. For those with sensitive skin stay in the shade and wear protective clothing, a wide-brimmed hat, and UV-blocking sunglasses. Generously apply broad spectrum SPF 30+ sunscreen every 2 hours, even on cloudy days. Watch out for relections from water that may increase ultraviolet exposure.

Sea Temperature in Guanacaste Region in September

The average sea water temperature in Guanacaste Region in September is 23.6°C (74.5°F) which is warm and pleasant for relaxing and swimming for long periods. The sea temperature in September is noticeably cooler than the previous month.

Rainfall in Guanacaste Region in September

September weather is much wetter than the previous month and rainfall continues to rise into October. September has a few more days of rain than the previous month and rainy days continue to rise slightly into October. The average total rainfall in Guanacaste Region in September is 21.9cm (8.6inches) and on average there are 19.4 rainy days in September making it a wet time to visit the beach.

Humidity in Guanacaste Region in September

The maximum dew point (an indicator of humidity) in Guanacaste Region in September is 25°C (76°F) which is very uncomfortable and fairly oppressive unless you are on a beach. At night you would most likely require airconditioning. The dew point is 24°C (76°F) in the previous month and 24°C (24°F) in the next month.

The average maximum relative humidity in Guanacaste Region in September is typically 95.8%. The maximum relative humidity is 94% in the previous month and 96.2% in the next month.

The average relative humidity in Guanacaste Region in September is typically 79.7%. The average relative humidity is 75.4% in the previous month and 81.3% in the next month.

Wind Speed in Guanacaste Region in September

The average maximum wind speed in Guanacaste Region in September is typically 19KM/H (12MPH). The average maximum wind speed is 21KM/H (13MPH) in the previous month and 17KM/H (11MPH) in the next month.

The average wind speed in Guanacaste Region in September is typically 7KM/H (4MPH). The average wind speed is 8KM/H (5MPH) in the previous month and 7KM/H (4MPH) in the next month.

The average wind direction in Guanacaste Region in September is from the South-Southwest.

Monthly Averages

Suggested Beaches in September

Need Inspiration?

Beaches recommended for you today, this weekend, in the next 2 weeks or in any month of the year.

Booking.com Search FlightsImage

Need Inspiration?

Beaches recommended for you today, this weekend, in the next 2 weeks or in any month of the year.