Weather in Knoxville in August

Shoulder season. August sits in between. You will get good days and you will lose some. You should expect rain on 15 days of the month, which is more days wet than dry.

August ranks 8 of 12 in Knoxville: past the worst of the year but short of October, which is the month to book if the dates are open.

Rain on 15 days, 3 of them heavy. Enough to need a plan B, not enough to need a plan around it. Pack for 31.9 °C days and 20.1 °C nights; the spread matters more here than any single number.

What the averages hide

Averages flatten a month, and this one hides a few things: 5 days clear 35 °C, so a serious heatwave is normal rather than notable. Across the twenty years measured, the hottest August day reached 40.2 °C and the coldest night fell to 11.3 °C, and the wettest single day dropped 43 mm — roughly 46% of the month's rain in one day.

August is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest August on record still delivered 146 mm against 36 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 94 mm average is a reasonable planning figure, not a promise.

Wind is light at 2.3 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 70%.

How August sits in the year

Temperatures hold steady either side: 31.5 °C in July, 31.9 here, 29.3 in September. Nothing about the timing within the month matters much. Rain is the thing that moves: September brings 5 days less of it, so pushing the dates later buys drier weather.

Daylight in August

13.6 hours of daylight, losing 1 hours across the month. That is between Knoxville's extremes of 14.6 and 9.7 hours, so days are long enough not to constrain the plan.

An inland climate

With no coast nearby, the year swings a fair way — 33.1 °C between the warmest afternoons and the coldest nights, wider than any coastal city at this latitude would manage.

How busy it gets

Quiet. Few other visitors, cheaper rooms, and a real chance some seasonal operators are shut.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

August in Knoxville versus nearby

If Knoxville is one option among several, the nearby comparison is worth making. Atlanta is close enough to be a coin toss — within a degree on temperature, 1 day more rain. Nashville is close enough to be a coin toss — within a degree on temperature, 1 day less rain.

So: August is a compromise. October is 31 points better and is what Knoxville is actually like at its best — worth moving the trip for if that is possible, and worth adjusting expectations for if it is not.

Every month in Knoxville

See all twelve months in Knoxville, or where else to go in August.