September weather forecast and climate
Fortuna, Costa Rica

The first month of the autumn, September, is also a warm month in Fortuna, Costa Rica, with average temperature fluctuating between 22°C (71.6°F) and 29°C (84.2°F).

Temperature

In September, the average high-temperature is 29°C (84.2°F), and the average low-temperature is 22°C (71.6°F).

Rainfall

In Fortuna, during September, the rain falls for 23 days and regularly aggregates up to 413mm (16.3") of precipitation. Throughout the year, there are 190 rainfall days, and 3508mm (138.1") of precipitation is accumulated.

Daylight

In September, the average length of the day is 12.2h.

Sunshine

Months with the least sunshine are September through November, with an average of 5h of sunshine.

UV index

Months with the highest UV index are February through October, with an average UV index of 12.

What is the temperature in September in Fortuna?

The average high-temperature, in September, is 29°C (84.2°F), while the average low-temperature is 22°C (71.6°F).

How much does it rain in Fortuna in September?

In Fortuna, Costa Rica, during September, the rain falls for 23 days and regularly aggregates up to 413mm (16.3") of precipitation.

How many hours of daylight does Fortuna have in September?

In September, the average length of the day is 12.2h.

What is the month with the least sunshine in Fortuna?

September through November, with an average of 5h of sunshine, are months with the least sunshine in Fortuna.

How many hours of sunshine does Fortuna have in September?

The average sunshine in September in Fortuna, Costa Rica, is 5h.

What are the months with the highest UV index in Fortuna?

February through October, with an average UV index of 12, are months with the highest UV index in Fortuna.

What is the UV index reading in September in Fortuna?

In September, the average UV index in Fortuna, Costa Rica, is 12.
Average temperature in September - Fortuna, Costa Rica
  • Average high temperature in September: 29°C

Warmest months (with the highest average high temperature) are March and April (32°C).
The month with the lowest average high temperature is November (28°C).

  • Average low temperature in September: 22°C

The month with the highest average low temperature is April (24°C).
Coldest months (with the lowest average low temperature) are January, October, November and December (21°C).

Average rainfall in September - Fortuna, Costa Rica
  • Average rainfall in September: 413mm

The wettest month (with the highest rainfall) is July (462mm).
The driest month (with the lowest rainfall) is March (81mm).

Average rainfall days in September - Fortuna, Costa Rica
  • Average rainfall days in September: 23 days

The month with the highest number of rainy days is September (23 days).
Months with the lowest number of rainy days are February and March (7 days).

Average daylight in September / Average sunshine in September - Fortuna, Costa Rica
  • Average daylight in September: 12.2h

Months with the longest days are June and July (Average daylight: 12.7h).
The month with shortest days is December (Average daylight: 11.5h).

  • Average sunshine in September: 5h

Months with most sunshine are February, March and April (Average sunshine: 7h).
Months with least sunshine are September, October and November (Average sunshine: 5).

Average UV index in September - Fortuna, Costa Rica
  • Average UV index in September: 12

Months with the highest UV index are February, March, April, May, June, July, August, September and October (UV index 12).
The month with the lowest UV index is December (UV index 10).

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