Knoxville, TN Weather
Knoxville hourly forecast: next 24 hours
Today's high of 92°F (33°C) is about 9°F (5°C) above the typical September high of 83°F (28°C).
Current conditions in detail
Knoxville weather tomorrow (Wednesday, September 16)
Tomorrow in Knoxville looks sunny, with a high of 92° and an overnight low of 72°. Rain is unlikely (3% chance). Winds top out near 8 mph, and the UV index reaches 8 (high).
Knoxville 14-day forecast
About the weather in Knoxville
A 22°C spread between its warmest and coolest months puts Knoxville among the more strongly seasonal places we cover. July averages 88°F (31°C) by day; January averages 47°F (9°C), with nights at 31°F (0°C).
Knoxville weather: quick facts
- Hottest month: July - highs near 88°F (31°C)
- Coldest month: January - highs near 47°F (9°C)
- Decade extremes (2015-2024): 100°F (38°C) high · -1°F (-18°C) low
- Wettest month: February (12 rainy days) · Sunniest: June (11.9 h sun/day)
- Climate type: humid subtropical
- Annual swing: 22°C between the average warmest and coolest month · day to night: 10°C
- Snow: about 4 days a year
- Months averaging 30°C or hotter: 2
- Average humidity: 72%
Temperatures through the year
January is the coolest month, with highs of 47°F (9°C) and lows near 31°F (0°C). At its warmest, in July, Knoxville runs to 88°F (31°C) in the afternoon and back to 70°F (21°C) by dawn. The gridded 2015-2024 daily record for this location tops out at 100°F (38°C) and bottoms at -1°F (-18°C) - decade extremes, not all-time station records. June is the brightest month at 11.9 hours of sun a day, against an annual average of 9.0.
Rain, sun and snow
Average lows drop to freezing in one month of the year, January. Days and nights are about 10°C apart on average - wider than roughly 76% of the cities we track. Precipitation concentrates in February - 6.0 inches (152 mm) on 12 days - and thins out by October. Snow falls on roughly 4 days a year, mostly December through February.
Season by season
Spring (March through May)
Through spring, Knoxville settles into easy warmth: 69°F (21°C) by day, 49°F (9°C) after dark, and rain falls on around 35 of the 90 days.
Summer (June through August)
Summer in Knoxville is hot, with daytime highs averaging 87°F (30°C) and nights around 68°F (20°C); rain falls on around 40 of the 90 days. Daylight is generous - around 11.6 hours of sun a day. With the moisture factored in, afternoons feel hotter than the reading suggests - the humidity and dew point converter shows why.
Fall (September through November)
Through fall, Knoxville brings comfortable warmth: 72°F (22°C) by day, 53°F (11°C) after dark, and expect showers on roughly 24 days across the season.
Winter (December through February)
Through winter, Knoxville is brisk and cold: 51°F (11°C) by day, 34°F (1°C) after dark, and rain falls on around 35 of the 90 days, plus about 4 snowy days.
Average temperatures in Knoxville by month
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 47° | 31° | 12 | 4.4 in | 6.2 h/day | 73% |
| February | 54° | 35° | 12 | 6.0 in | 6.4 h/day | 73% |
| March | 61° | 41° | 12 | 5.1 in | 8.1 h/day | 70% |
| April | 69° | 48° | 11 | 4.4 in | 9.8 h/day | 69% |
| May | 78° | 58° | 12 | 3.8 in | 10.8 h/day | 72% |
| June | 85° | 66° | 12 | 3.3 in | 11.9 h/day | 69% |
| July | 88° | 70° | 15 | 4.0 in | 11.7 h/day | 73% |
| August | 86° | 69° | 13 | 4.3 in | 11.1 h/day | 74% |
| September | 83° | 64° | 9 | 3.4 in | 10.1 h/day | 70% |
| October | 72° | 53° | 7 | 3.2 in | 9.0 h/day | 71% |
| November | 60° | 41° | 8 | 3.5 in | 7.5 h/day | 72% |
| December | 53° | 36° | 11 | 5.1 in | 5.8 h/day | 77% |