September weather forecast and climate
Cartagena, Costa Rica

Weather in September

The first month of the autumn, September, is still a warm month in Cartagena, Costa Rica, with average temperature fluctuating between 29.6°C (85.3°F) and 24.1°C (75.4°F).

Temperature

In Cartagena, Costa Rica, the average high-temperature is practically the same as in August - a moderately hot 29.6°C (85.3°F). The average low-temperature, in Cartagena, is 24.1°C (75.4°F).

Heat index

The average heat index is calculated to be a very hot 37.3°C (99.1°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'feels like', 'felt air temperature', or 'real feel', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. Additional factors like activity, differences in body mass, height, and shape, metabolic differences, and clothing affect individual temperature impact. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. When the relative humidity is high, the evaporation rate is reduced. The warmth is removed from the body at a lower rate, causing the body to retain more heat than it would in dry air. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.

Humidity

In September, the average relative humidity in Cartagena is 83%.

Rainfall

In September, in Cartagena, the rain falls for 21.7 days. Throughout September, 92mm (3.62") of precipitation is accumulated. Throughout the year, there are 137.5 rainfall days, and 624mm (24.57") of precipitation is accumulated.

Daylight

The average length of the day in Cartagena is 12.2h.

Sunshine

In Cartagena, the average sunshine is 8.7h.

UV index

Months with the highest UV index in Cartagena are January through December, with an average maximum UV index of 7. January through December, with an average maximum UV index of 7, are months with the lowest UV index. A UV Index reading of 6 to 7 represents a high health vulnerability from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily maximum UV index of 7 in September interpret into the following advice:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in September in Cartagena?

In Cartagena, in September, the average high-temperature is 29.6°C (85.3°F), and the average low-temperature is 24.1°C (75.4°F). The average heat index (a.k.a. 'feels like', 'felt air temperature'), which combines air temperature and relative humidity, in September is calculated to be 37.3°C (99.1°F).

What is the average humidity in September in Cartagena?

In September, the average relative humidity in Cartagena is 83%.

How much does it rain in Cartagena in September?

In September, in Cartagena, Costa Rica, the rain falls for 21.7 days. Throughout September, 92mm (3.62") of precipitation is accumulated.

How many hours of daylight does Cartagena have in September?

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

How long on average sun shines in September in Cartagena?

The average sunshine in September in Cartagena is 8.7h.

When is the highest UV index in Cartagena?

January through December, with an average maximum UV index of 7, are months with the highest UV index in Cartagena, Costa Rica.

What is the month with the lowest UV index in Cartagena?

January through December, with an average maximum UV index of 7, are months with the lowest UV index in Cartagena.

What is the UV index intensity in September in Cartagena?

In Cartagena, the average daily maximum UV index in September is 7. A UV Index value of 6 to 7 symbolizes a high health risk from unprotected exposure to the UV radiation.

Average temperature in September
Cartagena, Costa Rica

Average temperature in September - Cartagena, Costa Rica
  • Average high temperature in September: 29.6°C

The warmest month (with the highest average high temperature) is April (33.4°C).
The month with the lowest average high temperature is October (28.7°C).

  • Average low temperature in September: 24.1°C

The month with the highest average low temperature is May (25.8°C).
The coldest month (with the lowest average low temperature) is January (23°C).

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Average pressure in September
Cartagena, Costa Rica

Average pressure in September - Cartagena, Costa Rica
  • Average pressure in September: 1010.3mbar

The month with the highest atmospheric pressure is January (1011.1mbar).
The month with the lowest atmospheric pressure is October (1010.1mbar).

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Average wind speed in September
Cartagena, Costa Rica

Average wind speed in September - Cartagena, Costa Rica
  • Average wind speed in September: 7.9km/h

The windiest month (with the highest average wind speed) is February (21.9km/h).
The calmest month (with the lowest average wind speed) is September (7.9km/h).

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Average humidity in September
Cartagena, Costa Rica

Average humidity in September - Cartagena, Costa Rica
  • Average humidity in September: 83%

The month with the highest relative humidity is October (84%).
Months with the lowest relative humidity are March and April (65%).

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Average rainfall in September
Cartagena, Costa Rica

Average rainfall in September - Cartagena, Costa Rica
  • Average rainfall in September: 92mm

The wettest month (with the highest rainfall) is October (177mm).
The driest months (with the least rainfall) are February and March (1mm).

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Average rainfall days in September
Cartagena, Costa Rica

Average rainfall days in September - Cartagena, Costa Rica
  • Average rainfall days in September: 21.7 days

The month with the highest number of rainy days is October (22.5 days).
The month with the least rainy days is February (0.8 days).

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Average daylight in September /
Average sunshine in September
Cartagena, Costa Rica

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

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

  • Average sunshine in September: 8.7h

The month with the most sunshine is July (Average sunshine: 10.7h).
The month with the least sunshine is January (Average sunshine: 7.6h).

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Average sunshine days in September
Cartagena, Costa Rica

Average sunshine days in September - Cartagena, Costa Rica
  • Average sunshine days in September: 7.8 days

The month with the most sunshine days is March (30.1 days).
The month with the least sunshine days is October (7 days).

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Average UV index in September
Cartagena, Costa Rica

Average UV index in September - Cartagena, Costa Rica
  • Average UV index in September: 7

Months with the highest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 7).
Months with the lowest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 7).

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Average cloud cover in September
Cartagena, Costa Rica

Average cloud cover in September - Cartagena, Costa Rica
  • Average cloud cover in September: 39

The month with the most cloud cover is October (Cloud cover 43).
The month with the least cloud cover is February (Cloud cover 9).

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Average visibility in September
Cartagena, Costa Rica

Average visibility in September - Cartagena, Costa Rica
  • Average visibility in September: 10km

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).

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