Powell, Tennessee Weather
Fireflies pulse through the magnolias. Day 77 of spring. Read this microseason across nine climate regions →
Powell weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Clear——79°56°—
- FridayJun 5Overcast——82°61°+3°
- SaturdayJun 6Overcast——86°62°+4°
- SundayJun 7Overcast11%—86°67°0°
- MondayJun 8Drizzle28%0.11″74°67°-12°
- TuesdayJun 9Light Drizzle38%—75°66°+1°
- WednesdayJun 10Overcast20%—79°67°+4°
PM2.5 at 5.2 µg/m³ (AQI 29) with a 0.96 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust. AQI down 22 over the last 6 hours — air quality is improving sharply.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 5 PM.
What's driving it
PM × Wind × Precip
PM2.5 at 5.2 µg/m³ (AQI 29) with a 0.96 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.96
- Wind
- calm
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 3:52 AM
- Moonset
- 1:49 PM
- In sign
- ♑︎ Capricorn
Fireflies pulse through the magnolias
Powell at a glance
- Today vs. normal: 23°F below the seasonal normal for this latitude
- Last frost: March 23 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 4, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
SPC Convective Outlook
Storm Prediction Center — Powell
SPC has placed Powell in the General Thunderstorms category for severe thunderstorms day after tomorrow.
- TODAYNONENo severe risk
- TOMORROWNONENo severe risk
- DAY 3TSTMGeneral Thunderstorms
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | — | — |
| February | — | — |
| March | — | — |
| April | lettuce, peas, spinach, radishes | — |
| May | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| July | tomatoes, peppers, beans, squash | tomatoes, beans, summer squash |
| August | — | tomatoes, beans, summer squash |
| September | fall brassicas, garlic (overwinter), carrots | tomatoes, beans, summer squash |
| October | fall brassicas, garlic (overwinter), carrots | winter squash, tomatoes (last) |
| November | — | — |
| December | — | — |
A year in weather
Powell's warmest month is July (~77°F mean) and its coldest is January (~37°F). Rainfall peaks in December (5.9 inches) and bottoms out in October (3.0 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 37° | 5.2″ | 9 |
| February | 41° | 5.1″ | 8 |
| March | 49° | 5.3″ | 9 |
| April | 57° | 5.3″ | 8 |
| May | 66° | 4.5″ | 8 |
| June | 74° | 4.0″ | 7 |
| July | 77° | 5.8″ | 9 |
| August | 76° | 3.4″ | 7 |
| September | 71° | 4.1″ | 6 |
| October | 59° | 3.0″ | 5 |
| November | 48° | 4.1″ | 7 |
| December | 40° | 5.9″ | 9 |
Regional context
Powell sits within a humid subtropical climate region — a cohort that shares similar temperature ranges, seasonal patterns, and growing conditions across nearby cities.
Similar climates: Nashville, TN, Memphis, TN, Knoxville, TN, Chattanooga, TN, Clarksville, TN.
Frequently asked
- When does it freeze in Powell?
- Powell's last spring frost typically falls around mid-April, and the first fall frost arrives around mid-November.
- What is the rainy season in Powell?
- December is the wettest month with about 5.9 inches of rain on average; the city receives roughly 56 inches annually.
- What is the warmest month in Powell?
- July is typically warmest, averaging about 77°F.
- What is the coldest month in Powell?
- January is typically coldest, averaging about 37°F.
- When can I start a vegetable garden in Powell?
- Cool-season crops (peas, lettuce) can be sown around the last spring frost (mid-April); warm-season crops (tomatoes, peppers) wait until 1–2 weeks after.
- How many rainy days does Powell get?
- Powell averages about 90 rainy days per year.
- What hardiness zone is Powell?
- Powell's USDA hardiness zone is determined by its lowest average winter temperature; check the USDA's online lookup with the city ZIP for the current zone designation.
Climate
Powell, Tennessee sits in a humid subtropical climate zone. January means hover near 37°F while July averages 77°F — a 40°F seasonal swing.
Across the year, Powell receives about 56 inches of precipitation spread over roughly 90 rainy days.
The rhythm of the year is set by latitude (36.0°N), proximity to large water bodies, and elevation — all of which shape what grows here, when frost is likely, and what the weather story looks like day to day.