May weather forecast
Herradura, Costa Rica

May, regarded as the start of the wet season in Costa Rica, shows a dramatic rise of rainfall, peaking to 201mm (7.91") this month. It's a month known for its unique blend of warm tropical temperatures and increased moisture levels. Despite the frequent showers, tourists can enjoy a good blend of sun and cloud. The gentle wind, paired with increased daylight hours, brings an added charm to this city. So, if you want to enjoy Costa Rica’s magnificent biodiversity, May presents a unique lens to view its well-watered lush landscapes.

Temperature

The arrival of May sees a recorded average high-temperature of a moderately hot 29.5°C (85.1°F), showing little divergence from the previous month's conditions. During May, Herradura perceives a slight decrease in temperature from daytime highs, settling at an average low of 26.2°C (79.2°F).

Heat index

May's average heat index is computed to be a torrid 35°C (95°F). Heightened safety actions are necessary, heat cramps and heat exhaustion are probable. Persistent activity may lead to heatstroke.
Understand that the heat index values take into account shaded locations and mild winds. The heat index could experience an increase of 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is a value derived by merging air temperature with the humidity to convey how the climate feels. Depending on the activity and the individual's heat perception, which may vary due to factors including wind, clothing, and metabolic variations, this effect remains subjective. 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 particularly meaningful for babies and toddlers. Children commonly overlook the importance of rest and fluid replenishment. Thirst, being a delayed sign of dehydration, emphasizes the need to keep hydration up, especially during lengthy physical activities.
In high temperatures, perspiration kicks in, allowing the human body to cool down through the evaporation of sweat. A surge in relative humidity can disrupt the body's normal cooling function by slowing evaporation, hence reducing the rate at which the body cools and intensifying the perception of heat. Overheating risks increase with rising body temperatures, especially if heat release isn't efficient.

Humidity

The average relative humidity in May is 77%.

Rainfall

In Herradura, in May, it is raining for 25.3 days, with typically 201mm (7.91") of accumulated precipitation. In Herradura, during the entire year, the rain falls for 236.2 days and collects up to 1501mm (59.09") of precipitation.

Sea temperature

The months with the warmest seawater are March through August, with an average sea temperature of 29°C (84.2°F).
Note: For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

Daylight

The average length of the day in May is 12h and 34min.
On the first day of the month, sunrise is at 05:21 and sunset at 17:49. On the last day of May, sunrise is at 05:16 and sunset at 17:55 CST.

Sunshine

The average sunshine in May in Herradura is 8.7h.

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. A UV Index of 6 to 7 symbolizes a high threat to health from unsafe exposure to UV radiation for average individuals.
Note: A daily maximum UV index of 7 in May translates into the following instructions:
Adopt measures and apply sun safety strategies. Shielding from skin and eye damage is necessary. Stay out of direct sunlight between 10 a.m. and 4 p.m., when UV radiation is most intense, and remember that not all shade structures provide complete protection. During bright days, sunglasses that offer UVA and UVB defense are recommended. Stay aware! UV radiation is magnified when reflecting off sand and water.