May weather forecast and climate
Cartagena, Costa Rica

Weather in May

The last month of the spring, May, is another hot month in Cartagena, Costa Rica, with average temperature fluctuating between 25.8°C (78.4°F) and 32.1°C (89.8°F).

Temperature

In Cartagena, the average high-temperature in May is relatively the same as in April - a still tropical 32.1°C (89.8°F). In May, the average low-temperature is 25.8°C (78.4°F).

Heat index

The average heat index is calculated to be a scorching 41.5°C (106.7°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. 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 'feels like', 'apparent temperature', '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. This effect is individual, with diverse people perceiving weather differently for numerous reasons (metabolic differences, differences in body mass, height, and shape, wind), and activity. Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. High relative humidity reduces the evaporation rate, resulting in a lower heat removal rate from the body, causing the perception of being overheated. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

In Cartagena, the average relative humidity is 72%.

Rainfall

In Cartagena, it is raining for 16.8 days, with typically 81mm (3.19") of accumulated precipitation. In Cartagena, during the entire year, the rain falls for 137.5 days and collects up to 624mm (24.57") of precipitation.

Daylight

In May, the average length of the day is 12.6h.

Sunshine

The average sunshine in Cartagena is 9.1h.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index. January through December, with an average maximum UV index of 7, are months with the lowest UV index in Cartagena. A UV Index of 6 to 7 symbolizes a high threat to health from the exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 7 interpret into the following advice:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. 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 May in Cartagena?

The average high-temperature, in May, is 32.1°C (89.8°F), while the average low-temperature is 25.8°C (78.4°F). The average heat index (a.k.a. 'apparent temperature', 'feels like'), which represents the influence of relative humidity on air temperature, in May is calculated to be 41.5°C (106.7°F).

What is the average humidity in May in Cartagena?

In May, the average relative humidity in Cartagena is 72%.

How many days does it rain in May in Cartagena?

In May, in Cartagena, Costa Rica, the rain falls for 16.8 days. Throughout May, 81mm (3.19") of precipitation is accumulated.

What is the average length of the day in May in Cartagena?

In Cartagena, the average length of the day in May is 12.6h.

How long on average sun shines in May in Cartagena?

The average sunshine in May in Cartagena, Costa Rica, is 9.1h.

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

Months with the highest UV index are January through December, with an average maximum UV index of 7.

What are the months 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 reading in May in Cartagena?

In May, the average daily maximum UV index in Cartagena, Costa Rica, is 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in May
Cartagena, Costa Rica

Average temperature in May - Cartagena, Costa Rica
  • Average high temperature in May: 32.1°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 May: 25.8°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 May
Cartagena, Costa Rica

Average pressure in May - Cartagena, Costa Rica
  • Average pressure in May: 1010.2mbar

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 May
Cartagena, Costa Rica

Average wind speed in May - Cartagena, Costa Rica
  • Average wind speed in May: 10.4km/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 May
Cartagena, Costa Rica

Average humidity in May - Cartagena, Costa Rica
  • Average humidity in May: 72%

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 May
Cartagena, Costa Rica

Average rainfall in May - Cartagena, Costa Rica
  • Average rainfall in May: 81mm

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 May
Cartagena, Costa Rica

Average rainfall days in May - Cartagena, Costa Rica
  • Average rainfall days in May: 16.8 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 May /
Average sunshine in May
Cartagena, Costa Rica

Average daylight in May / Average sunshine in May - Cartagena, Costa Rica
  • Average daylight in May: 12.6h

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 May: 9.1h

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 May
Cartagena, Costa Rica

Average sunshine days in May - Cartagena, Costa Rica
  • Average sunshine days in May: 13.3 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 May
Cartagena, Costa Rica

Average UV index in May - Cartagena, Costa Rica
  • Average UV index in May: 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 May
Cartagena, Costa Rica

Average cloud cover in May - Cartagena, Costa Rica
  • Average cloud cover in May: 34

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 May
Cartagena, Costa Rica

Average visibility in May - Cartagena, Costa Rica
  • Average visibility in May: 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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