Chattanooga (TN) Temperature by Month
Chattanooga, Tennessee, United States of America has an average annual maximum temperature of 22°C (72°F), ranging from 10°C (50°F) in January to 32°C (90°F) in August. Below you'll find a full monthly breakdown and a comparison with cities worldwide.
Chattanooga Monthly Temperatures
Visitors to Chattanooga will encounter a climate influenced by big temperature differences across the year. Nighttime temperatures range from 21°C (70°F) in August to -1°C (30°F) in January.
The chart below illustrates the average maximum day and minimum night temperatures in Chattanooga 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 258 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Chattanooga 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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Chattanooga vs World: Temperature Compared
Chattanooga's average annual maximum temperature is 22°C (72°F). To put that in context, here's how it compares to a few well-known destinations:
Athens, Greece sits at 23°C (73°F) on average, with hot dry summers and mild winters characteristic of the Mediterranean.
Glasgow, Scotland averages 13°C (55°F) a year — mild but often grey, with cold winters and rarely hot summers.
Osaka, Japan averages 22°C (72°F) annually, with hot humid summers, mild winters, and pleasant spring and autumn seasons.
Perth, Australia averages 25°C (77°F) annually, with a classic Mediterranean climate — hot dry summers and mild wet winters.
What Does the Temperature Feel Like in Chattanooga?
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 the cooler months, when temperatures drop below 10°C, high humidity makes the cold feel more cutting than it would in dry conditions.
In Chattanooga, January is the coolest month, with average highs of 10°C (50°F) and humidity around 70% — considered high. In August, the warmest month, temperatures average 32°C (90°F) with 76% 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 Chattanooga this rarely lasts long on the ground.
For more on Chattanooga's weather — including monthly rainfall, sunshine hours, and humidity — visit our Chattanooga climate page.
