May weather forecast
Sámara, Costa Rica

May brings along a significant change in weather for Sámara, Costa Rica. Marking the beginning of the rainy season, a substantial rise in rainfall to 141mm (5.55") reflects the city's transition into its wet period. Despite the influx of rain, sea temperatures maintain a fairly steady heat level, exhibiting no notable decrease. The daylight hours remain almost the same as April, while the relative humidity increases to 77%. Balancing the augmented rainfall, the month's UV index still stays at a level of 7.

Temperature

As April transitions into May, Sámara records an average high-temperature of a still tropical 30.7°C (87.3°F), showing a gentle shift from the preceding month. In Sámara, in May, the average low-temperature is a warm 25.6°C (78.1°F).

Heat index

May's heat index is calculated to be a torrid 39°C (102.2°F). More preventive actions are needed, risk of heat exhaustion and heat cramps is significant. Prolonged activity may trigger heatstroke.
It is crucial to understand that heat index figures are for shade and gentle wind conditions. A direct sunlight exposure may boost the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. Elements such as metabolic variations, pregnancy, and physical exertion can shape one's weather perception. Awareness of direct sun exposure is crucial as it has the potential to heighten the weather's effects, pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Young ones are generally more prone to risk than adults due to their reduced ability to sweat. Their large skin surface area relative to their diminutive bodies and elevated heat production from their activities further enhance this risk.
Sweat evaporation, driven by perspiration, is the method the human body uses to rid itself of excessive warmth. When relative humidity increases, the body's capacity to evaporate heat decreases, leading to a heightened sense of warmth. Accumulating heat beyond the body's cooling measures leads to rising temperatures and potential ailments.

Humidity

In May, the average relative humidity is 77%.

Rainfall

In Sámara, in May, during 23.3 rainfall days, 141mm (5.55") of precipitation is typically accumulated. In Sámara, Costa Rica, during the entire year, the rain falls for 205 days and collects up to 1087mm (42.8") of precipitation.

Sea temperature

With an average sea temperature of 29.4°C (84.9°F), May is the month with the warmest seawater.
Note: Between the temperatures of 25°C (77°F) and 29°C (84.2°F), water is considered very warm, providing pleasure in water activities without discomfort over lengthy periods.

Daylight

In Sámara, the average length of the day in May is 12h and 35min.
On the first day of the month, sunrise is at 05:24 and sunset at 17:53. On the last day of May, sunrise is at 05:20 and sunset at 17:59 CST.

Sunshine

The average sunshine in May in Sámara is 8.1h.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index. The months with the lowest UV index are January through December, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: A maximum UV index of 7 in May translates into the following recommendations:
Persist with safeguards and heed sun safety doctrines. Keeping sunburn at bay is of prime importance. From 10 a.m. to 4 p.m., when UV radiation is at its strongest, limit direct exposure to the Sun and note that shade structures may not provide full sun protection. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection. Warning! Reflective surfaces like sand and water amplify the Sun's UV radiation.