August weather forecastSiesta Key, FL
August
Weather in August
The last month of the summer, August, is also a hot month in Siesta Key, Florida, with an average temperature varying between 79.7°F (26.5°C) and 88.5°F (31.4°C).Temperature
August, having an average high-temperature of 88.5°F (31.4°C) and an average low-temperature of 79.7°F (26.5°C), is the warmest month.Heat index
The heat index value for August is evaluated at an extremely hot 104°F (40°C). Adopt heightened safety measures, heat cramps and heat exhaustion may occur. Sustained activity might cause heatstroke.Heat index specifics point out values are for conditions of shade and a slight breeze. The heat index can potentially augment by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'feels like', melds the effects of warmth and moisture to generate a feeling of heat. The influence of weather is personal, with varied individuals experiencing it differently due to differences in body mass, stature, and physical exertion levels. When in direct sunlight, one should be cautious as it can raise the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. Children usually face more risks than adults as their ability to sweat is less. Additionally, their larger skin surface in relation to their petite bodies and higher heat output due to their activities increases their vulnerability.
Humans rely on perspiration as a cooling mechanism, wherein the evaporating sweat counteracts excessive warmth. Augmented relative humidity impedes typical body cooling mechanisms by lowering the evaporation rate, resulting in decreased body cooling and an amplified perception of heat. Increasing body temperatures can be a precursor to dehydration if the body can't shed the extra heat.
Humidity
In August, the average relative humidity is 74%.Rainfall
The month with the most rainfall is August, when the rain falls for 26.8 days and typically aggregates up to 6.42" (163mm) of precipitation.Ocean temperature
The month with the warmest seawater is August, with an average ocean temperature of 86.7°F (30.4°C).Note: Waters warmer than 86°F (30°C) may not offer the rejuvenating feel many seek.
Daylight
In August, the average length of the day is 13h and 5min.On the first day of the month, sunrise is at 6:54 am and sunset at 8:18 pm. On the last day of August, in Siesta Key, sunrise is at 7:09 am and sunset at 7:51 pm EDT.
Sunshine
In Siesta Key, the average sunshine in August is 9.6h.UV index
May through September, with an average maximum UV index of 7, are months with the highest UV index. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: The UV index of 7 during August leads to these advisories:
Act on precautions and pay attention to sun safety recommendations. Avoidance of sunburn is obligatory. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is at its strongest, and remember that parasols or canopies do not offer full protection. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Attention! UV radiation is ramped up when reflecting off sand and water surfaces.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
Siesta Key, FL
- Average high temperature in August: 88.5°F
The warmest month (with the highest average high temperature) is August (88.5°F).
The month with the lowest average high temperature is January (68.5°F).
- Average low temperature in August: 79.7°F
The month with the highest average low temperature is August (79.7°F).
The coldest month (with the lowest average low temperature) is January (56.1°F).
Average pressure in August
Siesta Key, FL
- Average pressure in August: 29.98"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is September (29.95"Hg).
Average wind speed in August
Siesta Key, FL
- Average wind speed in August: 6.7mph
The windiest month (with the highest average wind speed) is January (9.3mph).
The calmest month (with the lowest average wind speed) is July (6.4mph).
Average humidity in August
Siesta Key, FL
- Average humidity in August: 74%
The month with the highest relative humidity is December (76%).
The months with the lowest relative humidity are March, April and May (72%).
Average rainfall in August
Siesta Key, FL
- Average rainfall in August: 6.42"
The wettest month (with the highest rainfall) is August (6.42").
The driest months (with the least rainfall) are February and November (1.06").
Average rainfall days in August
Siesta Key, FL
- Average rainfall days in August: 26.8 days
The month with the highest number of rainy days is August (26.8 days).
The months with the least rainy days are January, February and November (8.3 days).
Average sea temperature in August
Siesta Key, FL
- Average sea temperature in August: 86.7°F
The best month for swimming (with the highest average sea temperature) is August (86.7°F).
The coldest month (with the lowest average sea temperature) is January (64.1°F).
Average daylight in August /
Average sunshine in August
Siesta Key, FL
- Average daylight in August: 13h and 6min
The month with the longest days is June (Average daylight: 13h and 48min).
The month with the shortest days is December (Average daylight: 10h and 30min).
- Average sunshine in August: 9h and 36min
The month with the most sunshine is May (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 30min).
Average sunshine days in August
Siesta Key, FL
- Average sunshine days in August: 2.5 days
The month with the most sunshine days is January (21.1 days).
The month with the least sunshine days is August (2.5 days).
Average UV index in August
Siesta Key, FL
- Average UV index in August: 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).
Average cloud cover in August
Siesta Key, FL
- Average cloud cover in August: 27
The months with the most cloud cover are January and December (Cloud cover 30).
The month with the least cloud cover is May (Cloud cover 22).
Average visibility in August
Siesta Key, FL
- Average visibility in August: 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).
