May weather forecast and climate
Alfaro, Costa Rica

Weather in May

The last month of the spring, May, is also a moderately hot month in Alfaro, Costa Rica, with average temperature ranging between min 19.8°C (67.6°F) and max 27.7°C (81.9°F).

Temperature

In Alfaro, the average high-temperature is relatively the same as in April - a still moderately hot 27.7°C (81.9°F). In Alfaro, the average low-temperature is 19.8°C (67.6°F).

Heat index

In May, the average heat index is calculated to a hot 31.6°C (88.9°F). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. With the 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', 'felt air temperature', 'feels like', or 'real feel', is a measure that combines both air temperature and relative humidity into a single value that indicates how hot the weather feels. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (clothing, pregnancy, wind). 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.

Humidity

The average relative humidity is 82%.

Rainfall

In Alfaro, during May, the rain falls for 27.2 days and regularly aggregates up to 339mm (13.35") of precipitation. Throughout the year, in Alfaro, Costa Rica, there are 272 rainfall days, and 2217mm (87.28") of precipitation is accumulated.

Daylight

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

Sunshine

In Alfaro, Costa Rica, the average sunshine is 7.8h.

UV index

May, August and November, with an average maximum UV index of 5, are months with the lowest UV index in Alfaro. A UV Index value of 3 to 5 symbolizes a medium health hazard from the exposure to the Sun's UV rays for the ordinary person.
Note: In May, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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 Alfaro?

The average high-temperature, in May, in Alfaro, is 27.7°C (81.9°F), while the average low-temperature is 19.8°C (67.6°F). The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), that factores the actual air temperature with the relative humidity, in May is evaluated at 31.6°C (88.9°F).

What is the average humidity in May in Alfaro?

The average relative humidity in May is 82%.

How many days does it rain in May in Alfaro?

In Alfaro, Costa Rica, in May, it is raining for 27.2 days, with typically 339mm (13.35") of accumulated precipitation.

How many hours of daylight does Alfaro have in May?

In Alfaro, Costa Rica, the average length of the day in May is 12.6h.

How long on average sun shines in May in Alfaro?

The average sunshine in May is 7.8h.

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

Months with the lowest UV index are May, August and November, with an average maximum UV index of 5.

How high is the UV index in May in Alfaro?

In Alfaro, Costa Rica, the average daily maximum UV index in May is 5. A UV Index of 3 to 5 symbolizes a moderate health threat from unprotected exposure to the UV radiation.

Average temperature in May
Alfaro, Costa Rica

Average temperature in May - Alfaro, Costa Rica
  • Average high temperature in May: 27.7°C

The warmest months (with the highest average high temperature) are March and April (29.7°C).
The month with the lowest average high temperature is October (25.4°C).

  • Average low temperature in May: 19.8°C

The month with the highest average low temperature is May (19.8°C).
The coldest month (with the lowest average low temperature) is January (16.8°C).

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Average pressure in May
Alfaro, Costa Rica

Average pressure in May - Alfaro, Costa Rica
  • Average pressure in May: 1011mbar

The month with the highest atmospheric pressure is January (1012.1mbar).
The month with the lowest atmospheric pressure is October (1010.7mbar).

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Average wind speed in May
Alfaro, Costa Rica

Average wind speed in May - Alfaro, Costa Rica
  • Average wind speed in May: 4.8km/h

The windiest month (with the highest average wind speed) is February (10.6km/h).
The calmest month (with the lowest average wind speed) is September (3.8km/h).

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Average humidity in May
Alfaro, Costa Rica

Average humidity in May - Alfaro, Costa Rica
  • Average humidity in May: 82%

The month with the highest relative humidity is October (89%).
The month with the lowest relative humidity is March (70%).

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Average rainfall in May
Alfaro, Costa Rica

Average rainfall in May - Alfaro, Costa Rica
  • Average rainfall in May: 339mm

The wettest month (with the highest rainfall) is October (396mm).
The driest month (with the least rainfall) is February (17mm).

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Average rainfall days in May
Alfaro, Costa Rica

Average rainfall days in May - Alfaro, Costa Rica
  • Average rainfall days in May: 27.2 days

The month with the highest number of rainy days is October (30.2 days).
The month with the least rainy days is February (10.3 days).

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Average daylight in May /
Average sunshine in May
Alfaro, Costa Rica

Average daylight in May / Average sunshine in May - Alfaro, 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: 7.8h

The month with the most sunshine is March (Average sunshine: 9.4h).
The month with the least sunshine is October (Average sunshine: 7h).

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Average sunshine days in May
Alfaro, Costa Rica

Average sunshine days in May - Alfaro, Costa Rica
  • Average sunshine days in May: 2.8 days

The month with the most sunshine days is January (16.7 days).
The month with the least sunshine days is September (0.5 days).

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Average UV index in May
Alfaro, Costa Rica

Average UV index in May - Alfaro, Costa Rica
  • Average UV index in May: 5

Months with the highest UV index are January, February, March, April, June, July, September, October and December (UV index 6).
Months with the lowest UV index are May, August and November (UV index 5).

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Average cloud cover in May
Alfaro, Costa Rica

Average cloud cover in May - Alfaro, Costa Rica
  • Average cloud cover in May: 46

The month with the most cloud cover is October (Cloud cover 54).
The month with the least cloud cover is February (Cloud cover 19).

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Average visibility in May
Alfaro, Costa Rica

Average visibility in May - Alfaro, Costa Rica
  • Average visibility in May: 8km

Months with the highest visibility are February and March (10km).
Months with the lowest visibility are August, September, October and November (7km).

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