May weather forecast
Casselberry, FL

May, the last month of the spring in Casselberry, is a hot month, with temperature in the range of an average low of 69.1°F (20.6°C) and an average high of 86.2°F (30.1°C).

Temperature

Casselberry marks the arrival of May with an average high-temperature of a hot 86.2°F (30.1°C), hardly different from April's 82°F (27.8°C). Casselberry, during the month of May, experiences an average low-temperature of 69.1°F (20.6°C).

Heat index

The heat index for May is computed to be a sweltering 96.8°F (36°C). Undertake special precautions, the probability of heat exhaustion and heat cramps is high. Prolonged activity may provoke heatstroke.
Bear in mind that the heat index values are determined for shaded areas and light breezes. 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 'feels like', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. A person's impression of weather can be shaped by many aspects, among them metabolic variations, pregnancy, and levels of physical activity. The sun, when shining directly, can have a significant impact on the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Children often overlook the necessity for resting and fluid replenishment. Thirst is a late sign of dehydration - thus, it is critical to stay hydrated, especially during extended periods of physical activities.
In high temperatures, perspiration kicks in, allowing the human body to cool down through the evaporation of sweat. Elevated relative humidity disrupts typical body cooling by reducing the evaporation rate, consequently decreasing the body's cooling rate and enhancing the feeling of heat. Heat-related challenges, like dehydration, can be anticipated when body heat isn't managed effectively.

Humidity

The average relative humidity in May is 72%.

Rainfall

In Casselberry, Florida, in May, during 13.7 rainfall days, 2.01" (51mm) of precipitation is typically accumulated. In Casselberry, Florida, during the entire year, the rain falls for 172.9 days and collects up to 22.76" (578mm) of precipitation.

Daylight

The average length of the day in May is 13h and 35min.
On the first day of the month, sunrise is at 6:43 am and sunset at 8:01 pm. On the last day of May, sunrise is at 6:27 am and sunset at 8:18 pm EDT.

Sunshine

In Casselberry, the average sunshine in May is 10.7h.

UV index

May through September, with an average maximum UV index of 7, are months with the highest UV index in Casselberry. A UV Index value of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: The maximum daily UV index, 7 in May, converts into the following recommendations:
Inhibit overexposure. Warding off sun damage is of utmost importance. Attempt to stay under shade and limit exposure to the Sun between 10 a.m. and 4 p.m., when UV radiation is at its peak. Remember, devices such as parasols or canopies might not provide complete sun protection. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.