May weather forecast
Casselberry, FL

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Weather in May

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.
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Frequently asked questions

How hot is May in Casselberry?

The high-temperature, in May, in Casselberry, records 86.2°F (30.1°C), while the low-temperature is 69.1°F (20.6°C). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines relative humidity and air temperature, in May is computed to be 96.8°F (36°C).

What is the average humidity in May in Casselberry?

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

How many days does it rain in May in Casselberry?

In Casselberry, in May, during 13.7 rainfall days, 2.01" (51mm) of precipitation is typically accumulated.

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

The average day length in May is 13h and 35min.

What time are sunrise and sunset in May in Casselberry?

On the first day of May, sunrise is at 6:43 am and sunset at 8:01 pm. On the last day of the month, sunrise is at 6:27 am and sunset at 8:18 pm EDT.

How many hours of sunshine does Casselberry have in May?

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

When is the highest UV index in Casselberry?

May through September, with an average maximum UV index of 7, are months with the highest UV index in Casselberry.

What is the UV index reading in May in Casselberry?

In May, the average daily maximum UV index in Casselberry, Florida, is 7. A UV Index estimate of 6 to 7 represents a high health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Casselberry, FL

Average temperature in May - Casselberry, FL
  • Average high temperature in May: 86.2°F

The warmest month (with the highest average high temperature) is August (91°F).
The month with the lowest average high temperature is January (68.2°F).

  • Average low temperature in May: 69.1°F

The month with the highest average low temperature is August (76.6°F).
The coldest month (with the lowest average low temperature) is January (51.1°F).

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Average pressure in May
Casselberry, FL

Average pressure in May - Casselberry, FL
  • Average pressure in May: 30.02"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is September (29.97"Hg).

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Average wind speed in May
Casselberry, FL

Average wind speed in May - Casselberry, FL
  • Average wind speed in May: 6mph

The windiest months (with the highest average wind speed) are March and April (6.5mph).
The calmest month (with the lowest average wind speed) is July (4.6mph).

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Average humidity in May
Casselberry, FL

Average humidity in May - Casselberry, FL
  • Average humidity in May: 72%

The month with the highest relative humidity is September (77%).
The month with the lowest relative humidity is March (70%).

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Average rainfall in May
Casselberry, FL

Average rainfall in May - Casselberry, FL
  • Average rainfall in May: 2.01"

The wettest month (with the highest rainfall) is August (3.82").
The driest months (with the least rainfall) are January and March (0.79").

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Average rainfall days in May
Casselberry, FL

Average rainfall days in May - Casselberry, FL
  • Average rainfall days in May: 13.7 days

The month with the highest number of rainy days is August (23.4 days).
The month with the least rainy days is January (8.9 days).

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Average daylight in May /
Average sunshine in May
Casselberry, FL

Average daylight in May / Average sunshine in May - Casselberry, FL
  • Average daylight in May: 13h and 4min

The month with the longest days is June (Average daylight: 13h and 54min).
The month with the shortest days is December (Average daylight: 10h and 24min).

  • Average sunshine in May: 10h and 4min

The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 6h and 6min).

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Average sunshine days in May
Casselberry, FL

Average sunshine days in May - Casselberry, FL
  • Average sunshine days in May: 14.8 days

The month with the most sunshine days is January (19.3 days).
The month with the least sunshine days is August (4.6 days).

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Average UV index in May
Casselberry, FL

Average UV index in May - Casselberry, FL
  • Average UV index in May: 7

The months with the highest UV index are May, June, July, August and September (UV index 7).
The month with the lowest UV index is January (UV index 4).

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Average cloud cover in May
Casselberry, FL

Average cloud cover in May - Casselberry, FL
  • Average cloud cover in May: 28

The month with the most cloud cover is February (Cloud cover 37).
The month with the least cloud cover is May (Cloud cover 28).

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Average visibility in May
Casselberry, FL

Average visibility in May - Casselberry, FL
  • Average visibility in May: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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Casselberry, Florida, USA

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