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Powell, Tennessee Weather

Thunderheads boil and break at dusk. Day 16 of summer. Read this microseason across nine climate regions →

Powell weather forecast — hour by hour, 7-day outlook, NOAA radar

Powell, TN
Monday, July 6 at 5:13 AM
73
°
Partly Cloudy
Feels like
80°
Humidity
95%
Wind
4 mph
Sunrise
2:25 AM
Sunset
4:56 PM
Powell, TN
Hour by hour · 24h
24-Hour ForecastPowell, TN: 24-hour forecast. Temperatures range from 71 to 87 degrees Fahrenheit with a 35% chance of precipitation at 5 PM.
L 71°H 87°
Powell, TN
7-day forecast
  1. Today
    Jul 6
    Foggy
    35%
    —
    87°72°—
  2. Tuesday
    Jul 7
    Overcast
    44%
    —
    85°70°-2°
  3. Wednesday
    Jul 8
    Light Drizzle
    45%
    —
    89°70°+4°
  4. Thursday
    Jul 9
    Light Drizzle
    37%
    —
    91°70°+2°
  5. Friday
    Jul 10
    Drizzle
    46%
    —
    94°71°+3°
  6. Saturday
    Jul 11
    Light Drizzle
    67%
    —
    92°71°-2°
  7. Sunday
    Jul 12
    Light Drizzle
    43%
    —
    93°71°+1°
Powell, TN
Next 24 hours · Mild now
HOT 90°68°79°90°6a12p6p12anow 73°high 87°low 71°PRECIP %
Powell, TN
Anemometer · 24h winds · from true
NESW
From · True
W
266° · veering 14°
Direction
W
266°
Sustained
4
mph
Gust
8
mph
Peak 24h
20
avg 4 mph
Beaufort · 2 · LIGHT BRZ
0
CALM
<1
1
LIGHT AIR
1–3
2
LIGHT BRZ
4–7
3
GENTLE BRZ
8–12
4
MOD BRZ
13–18
5
FRESH BRZ
19–24
6
STRONG BRZ
25–31
7
NEAR GALE
32–38
24h · sust vs gust · mph
avg 4 mph · pk 20 mph @ 2:00p
010MPHB1B2B3B4-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 111SUSTGUST
−24h−18h−12h−6hnow
Light breeze veering 14° from the w.
Powell, TN
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
976.7
+0.7 mb in 3h · rising · 28.84 inHg
Now
976.7
mb
3h
+0.7
mb
12h
-0.2
mb
24h
+0.1
mb
Regime · STORM
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 975–979
970975980985-21h-18h-15h-12h-9h-6h-3h-24hNOW978.8975.4976.7
Deep low — expect rough seas, strong wind, and persistent rain.
Powell, TN
Air quality
33
AQI
Good
↓-42 in 6h

AQI 33 (Good), driven by PM2.5. AQI down 42 over the last 6 hours — air quality is improving sharply. PM2.5 at 12.7 µg/m³ (AQI 58) with a 0.99 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in stagnant air, not road dust.

OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.

PM 2.5DRIVERModerate
12.7μg/m³
PM 10Good
13μg/m³
NO₂Good
19μg/m³
OzoneGood
29μg/m³
UV IndexLow
0.0

What's driving it

PM × Wind × Precip

PM2.5 at 12.7 µg/m³ (AQI 58) with a 0.99 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in stagnant air, not road dust.

PM2.5/PM10
0.99
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).

7-DAY AQI TREND50100MONTUEWEDTHUFRISATSUNMON7-DAY PM2.5 TREND · μg/m³410
Powell, TN
Sky cover · visibility · 24h
Cloud cover
57%
PARTLY CLOUDY
100%0%−24h−18h−12h−6hnow
Visibility
24.9mi
UNLIMITED
55 mi0 mi−24h−18h−12h−6hnow
Earth · GOES-19 ABI
Full Disk · Visible · GeoColor
GOES-19 full disk Visible · GeoColor
True-color daytime, blue/IR sandwich at night
09:13 UTC · Powell, TN · NOAA NESDIS / STAR · up to 10848 px
Continental US · GOES-19 ABI
CONUS Sector · Visible · GeoColor
GOES-19 CONUS Visible · GeoColor
Daytime true-color, blue-light/IR sandwich at night
09:13 UTC · Powell, TN · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Powell, TN
Satellite · infrared · animated
Powell, TN
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Powell, TN
Almanac · Monday, July 6
When the stars begin to huddle, the earth will soon become a puddle.
Civil dawn
5:56 AM
Sunrise
2:25 AM
Daylight
14h 31m
Sunset
4:56 PM
Civil dusk
9:27 PM
Planting note
Sow fall broccoli and cabbage indoors for transplant in 4 weeks.
Powell, TN
The moon
Last Quarter
64% illuminated
Moonrise
12:17 AM
Moonset
12:54 PM
In sign
♓︎ Pisces
Powell, TN
Microseason
Jul 6–10

Thunderheads boil and break at dusk

weather
Jan 151% of the yearDec 31

Read this microseason across nine climate regions →

Powell at a glance

  • Today vs. normal: 3°F below the seasonal normal for this latitude
  • Last frost: March 23 (climatological average for this latitude)
  • Microseason: Jul 6–10
  • Planting window: Sow fall broccoli and cabbage indoors for transplant in 4 weeks.

ZIP code: 37849

15-Day Forecast — Powell

  1. Mon87°72°35%
  2. Tue85°70°44%
  3. Wed89°70°45%
  4. Thu91°70°37%
  5. Fri94°71°46%
  6. Sat92°71°67%
  7. Sun93°71°43%
  8. Mon94°72°31%
  9. Tue100°74°11%
  10. Wed102°75°11%
  11. Thu90°73°16%
  12. Fri85°66°50%
  13. Sat87°64°52%
  14. Sun89°64°46%
  15. Mon91°65°45%

Forecast data from Open-Meteo (CC BY 4.0).

Right now in the garden

Peak growing season

As of July 6, 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 includes Powell in the general thunderstorm area today — no severe risk, but storms are possible.

  • TODAYTSTMGeneral Thunderstorms
  • TOMORROWTSTMGeneral Thunderstorms
  • 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.

January 1–5: Frost quiets the live oaks.January 6–10: Still water thickens with ice.January 11–15: Springs begin to move beneath ice.January 16–20: Cardinal dawn calls grow bolder.January 21–25: Late January thaw pulses.January 26–31: Last freeze locks the land.February 1–5: February's lengthening light.February 6–10: Warming winds thaw the margin.February 11–15: Magnolia blooms break the gray.February 16–20: Mockingbirds resume the dawn chorus.February 21–25: Rain replaces the last snow.February 26–28: Mist clings to greening valleys.March 1–5: The green pulse awakens.March 6–10: Hibernators emerge to call.March 11–15: Dogwood and redbud ignite.March 16–20: Swallowtails emerge from winter silk.March 21–25: Light crowns the dogwood canopy.March 26–31: Redbud cascades over the thaw.April 1–5: Thunder announces the wet season.April 6–10: Barn swallows carve the warming sky.April 11–15: Magnolia blooms and falls in a breath.April 16–20: First rainbows arch over thunderheads.April 21–25: Reeds push through marsh water.April 26–30: Frost retreats; seedlings rise free.May 1–5: Warblers flood the canopy in waves.May 6–10: Tulip poplar lights the forest crown.May 11–15: Shad pulse upstream through rapids.May 16–20: Roses open on the Piedmont edge.May 21–25: Fireflies scout the humid dusk.May 26–31: Frog choruses rise from every wetland.June 1–5: Fireflies pulse through the magnolias.June 6–10: Kudzu climbs deeper into green.June 11–15: Sun climbs to its northern throne.June 16–20: Heat settles and the rain begins.June 21–25: The longest day turns toward shadow.June 26–30: Fireflies drift through Spanish moss.July 1–5: Cicadas claim the scorching afternoon.July 6–10: Thunderheads boil and break at dusk.July 11–15: Thunder builds each drowsy afternoon.July 16–20: Cicadas claim the long noon.July 21–25: Dog days drape the earth in haze.July 26–31: Katydids begin their rasping chorus.August 1–5: Dusk arrives one minute earlier each night.August 6–10: Meteorological summer's turning page.August 11–15: Cool winds gather at the margins.August 16–20: Dog-day cicadas rise.August 21–25: Heat breaks in creek beds.August 26–31: Monarchs gather strength.September 1–5: Harvests begin in earnest.September 6–10: Dew beads on resurrection fern.September 11–15: Raptors trail the thermals.September 16–20: Day and dark find balance.September 21–25: Thunder quiets the land.September 26–30: Insects retreat below.October 1–5: Swamp waters recede.October 6–10: Maples ignite the ridge.October 11–15: Asters crown the meadows.October 16–20: Crickets sing at dusk.October 21–25: Frost paints the garden.October 26–31: Light rains whisper down.November 1–5: Sweetgum Turns Crimson.November 6–10: Camellia Blooms Break Through.November 11–15: Earth Stiffens Underfoot.November 16–20: Bare Limbs Hold the Light.November 21–25: First Frost Grips the High Ground.November 26–30: North Wind Strips the Last Leaves.December 1–5: Darkness Falls Before Dinner.December 6–10: Winter Locks the Land.December 11–15: Wildlife Retreats to Shelter.December 16–20: Ice Edges Deepen Inward.December 21–25: The Sun Begins its Return.December 26–31: The Year Turns in Silence.🌱February 14 — First skunk-cabbage spathes thaw their way up☀️March 20 — Spring equinox — day and night balance🌸April 5 — Cherry blossoms peak in the parks🐦May 10 — Warbler migration peaks along the coast✨May 25 — First fireflies scout the meadows at dusk🌞June 21 — Summer solstice — longest day🦗July 25 — Peak cicada chorus in the afternoons🌊August 18 — Warmest sea-surface temperatures of the year🍂September 22 — Autumn equinox — the slow turn❄️October 25 — First widespread frost in the suburbs🍁November 10 — Peak leaf color across the Hudson Valley🌙December 21 — Winter solstice — longest night

Microseason · July 6–10

Thunderheads boil and break at dusk

Bermuda High dominates; afternoon convection builds daily, producing violent but brief thunderstorms by evening.

Day 187 of 365 · Wedge 38 of 72

The solar year drawn as a wheel of 72 five-day windows. Each wedge is one microseason; the four colored arcs mark winter, spring, summer, and autumn; the small icons sit at notable phenological events. The crimson pointer creeps clockwise as the year turns.

Planting calendar

MonthPlantHarvest
January——
February——
March——
Aprillettuce, peas, spinach, radishes—
Maylettuce, peas, spinach, radishes, tomatoes, peppers, beans, squashlettuce, peas, radishes
Junetomatoes, peppers, beans, squashlettuce, peas, radishes
Julytomatoes, peppers, beans, squashtomatoes, beans, summer squash
August—tomatoes, beans, summer squash
Septemberfall brassicas, garlic (overwinter), carrotstomatoes, beans, summer squash
Octoberfall brassicas, garlic (overwinter), carrotswinter squash, tomatoes (last)
November——
December——

A year in weather

Powell peaks at about 77°F in July and bottoms near 37°F in January; December brings the heaviest rain (4.9 inches) and October the least (2.4 inches).

MonthMean tempPrecipRainy days
January37°4.6″16
February40°4.1″15
March48°4.8″17
April57°4.0″16
May65°3.5″17
June74°3.8″17
July77°4.5″22
August76°4.4″22
September71°2.7″14
October60°2.4″10
November48°3.7″13
December40°4.9″16

Regional context

Powell's climate, from NOAA NCEI 1991-2020 station normals, pairs 37°F Januarys with 77°F Julys — a 41°F swing. About 47.5 inches of precipitation falls over roughly 197 days a year.

No season owns Powell's rain: December reaches 4.9 inches across 16.2 days and October keeps 2.4 inches on 9.8, an even spread through Powell's year. That even rhythm groups Powell with places like Karns, TN, Halls, TN and Knoxville, TN.

The cool-season window in Powell starts at mid-April, when nights stop freezing — think peas, lettuce, spinach, and radishes. Warm-soil crops in Powell wait about two weeks past Powell's last frost, once the soil warms. It shuts near mid-November, when freezes return to Powell and tender plants need cover. Within Powell, cold-air pooling chills low spots by 5-10°F, shifting Powell's local frost dates.

Similar climates: Karns, TN, Halls, TN, Knoxville, TN, Clinton, TN, Andersonville, TN.

Frequently asked

When does it freeze in Powell?
In Powell, expect the last spring frost near mid-April; Powell's first autumn frost comes around mid-November.
What is the rainy season in Powell?
Rainfall in Powell peaks in December near 4.9 inches, out of about 48 inches annually.
What is the warmest month in Powell?
Powell peaks in July, when the mean runs near 77°F.
What is the coldest month in Powell?
January is Powell's coldest month, averaging about 37°F.
When can I start a vegetable garden in Powell?
Hardy spring crops go in near mid-April in Powell; tender peppers and squash wait 10–14 days.
How many rainy days does Powell get?
Expect roughly 197 wet days a year in Powell.
What hardiness zone is Powell?
Because Powell bottoms near 37°F in January, that winter low sets Powell's USDA zone — verify by ZIP.
What is the 10-day forecast for Powell?
Powell's extended outlook — daily high and low temperatures and precipitation chances for each upcoming day — is in the daily forecast above.
Will it rain this week in Powell?
See this week's day-by-day rain chances for Powell in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in Powell?
Current conditions for Powell and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the Powell forecast updated?
The Powell forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in Powell?
Today's sunrise and sunset times for Powell are in the Almanac section above, along with civil dawn, civil dusk, and day length. Day length is longest near the summer solstice and shortest near the winter solstice.
How accurate is the weather forecast for Powell?
The next few days in Powell's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

In Powell, Tennessee, the humid subtropical climate runs from about 37°F in January to 77°F in July, a 40°F seasonal range.

Yearly precipitation in Powell totals around 48 inches, spread over about 197 days of rain or snow.

From 36.0°N, Powell sees a 40°F seasonal swing that governs Powell's planting and frost windows.

All cities in Tennessee →

Knoxville, TN weather →

ZIP codes in Powell

  • 37849

Climate normals from the Open-Meteo Climate API. Köppen approximation from NOAA NCEI U.S. Climate Regions. See methodology for data sources, editorial rules, and corrections. Maintainer: Brian Tighe.