Longboat Key (FL) Temperature by Month
Longboat Key in Florida, United States of America sees significant seasonal temperature differences, with daytime highs between 21°C (70°F) in January and 32°C (90°F) in August, averaging 27°C (81°F) annually. Explore the full monthly breakdown below.
Longboat Key Monthly Temperatures
Visitors to Longboat Key can expect significant temperature changes throughout the year. Nighttime temperatures also vary widely, ranging from 25°C (77°F) in August to 12°C (54°F) in January.
The chart below illustrates the average maximum day and minimum night temperatures in Longboat Key by month:
Low temperatures are most often recorded between 4 AM and 6 AM, while highs typically occur around 3 PM. August, the city's warmest month, sees 249 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Longboat Key vs the United States of America
The map below shows the annual temperature across the United States of America. You can also select individual months if you want to compare a specific time of year.
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Longboat Key vs World: Temperature Compared
Longboat Key's average annual maximum temperature is 27°C (81°F). To put that in context, here's how it compares to a few well-known destinations:
Lisbon, Portugal averages 21°C (70°F) annually — warm summers, mild winters, and rain mainly in the cooler months.
Zermatt, Switzerland averages just 4°C (39°F) annually due to its altitude, with very cold winters and cool summers even at its warmest.
Shanghai, China averages 21°C (70°F) a year, with warm summers, mild winters, and a noticeable spring and autumn.
Brisbane, Australia averages 26°C (79°F) a year, with warm winters and hot, humid summers.
What Does the Temperature Feel Like in Longboat Key?
Temperature alone doesn't tell the whole story — humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.
In Longboat Key, January is the coolest month, with average highs of 21°C (70°F) and humidity around 75% — considered high. In August, the warmest month, temperatures average 32°C (90°F) with 78% humidity — conditions that feel high. For a full picture, see our humidity page.
Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.
The readings come from a range of sources — land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.
Seasonal temperature shifts influence more than just how warm it feels — they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.
Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in Longboat Key this rarely lasts long on the ground.
For more on Longboat Key's weather — including monthly rainfall, sunshine hours, and humidity — visit our Longboat Key climate page.
