Weather StoryAlmanac, microseasons, and the day's weather story.

Simpsonville, South Carolina Weather

Cicadas claim the scorching afternoon. Day 15 of summer. Read this microseason across nine climate regions →

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

Simpsonville, SC
Sunday, July 5 at 8:20 AM
79
°
Clear
Feels like
86°
Humidity
77%
Wind
3 mph
Sunrise
2:21 AM
Sunset
4:45 PM
Simpsonville, SC
Hour by hour · 24h
24-Hour ForecastSimpsonville, SC: 24-hour forecast. Temperatures range from 74 to 95 degrees Fahrenheit with a 29% chance of precipitation at 8 PM.
L 74°H 95°
Simpsonville, SC
7-day forecast
  1. Today
    Jul 5
    Overcast
    29%
    —
    95°74°—
  2. Monday
    Jul 6
    Overcast
    42%
    —
    93°74°-2°
  3. Tuesday
    Jul 7
    Light Drizzle
    20%
    —
    96°70°+3°
  4. Wednesday
    Jul 8
    Overcast
    10%
    —
    99°71°+3°
  5. Thursday
    Jul 9
    Light Drizzle
    —
    —
    99°71°0°
  6. Friday
    Jul 10
    Overcast
    15%
    —
    102°73°+3°
  7. Saturday
    Jul 11
    Partly Cloudy
    33%
    —
    98°75°-4°
Simpsonville, SC
Next 24 hours · Mild now
HOT 90°70°85°100°6a12p6p12anow 78°high 95°low 74°PRECIP %
Simpsonville, SC
Anemometer · 24h winds · from true
NESW
From · True
WSW
250° · veering 43°
Direction
WSW
250°
Sustained
3
mph
Gust
5
mph
Peak 24h
14
avg 5
Beaufort · 1 · LIGHT AIR
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 5 · pk 14 @ 5:00a
0102030MPHB1B2B3B4B5B6B7-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 323SUSTGUST
−24h−18h−12h−6hnow
A whisper of wind — leaves barely shift on the trees.
Simpsonville, SC
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
984.0
+1.6 mb in 3h · rising · 29.06 inHg
Now
984.0
mb
3h
+1.6
mb
12h
+1.1
mb
24h
-3.0
mb
Regime · STORM
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 981–987
9759809859909951000STORM|RAIN10051010RAIN|CHG1015CHG|FAIR10201025FAIR|DRY1030-21h-18h-15h-12h-9h-6h-3h-24hNOW986.7981.0983.7
−24h−18h−12h−6hnow
The low is filling — pressure climbing out of storm territory.
Simpsonville, SC
Air quality
51
AQI
Moderate
↓-8 in 6h

AQI 51 (Moderate), driven by PM2.5. AQI down 8 over the last 6 hours (gradual decline). PM2.5 at 12.6 µg/m³ (AQI 58) with a 0.95 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.

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

PM 2.5DRIVERModerate
12.6μg/m³
PM 10Good
13μg/m³
NO₂Good
5μg/m³
OzoneModerate
68μg/m³
UV IndexLow
0.6

What's driving it

Ozone × UV × Sky

Ozone at AQI 32 now. With UV 2.0 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 6 around 1 PM.

Present
AQI 32
UV peak
2.0 at 1 PM
Sky at peak
partly cloudy
Projected peak
AQI 6

PM × Wind × Precip

PM2.5 at 12.6 µg/m³ (AQI 58) with a 0.95 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.

PM2.5/PM10
0.95
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 TREND50100SUNMONTUEWEDTHUFRISATSUN7-DAY PM2.5 TREND · μg/m³310
Simpsonville, SC
Sky cover · visibility · 24h
Cloud cover
6%
CLEAR
100%0%−24h−18h−12h−6hnow
Visibility
38.9mi
UNLIMITED
92 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
12:20 UTC · Simpsonville, SC · 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
12:20 UTC · Simpsonville, SC · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Simpsonville, SC
Satellite · infrared · animated
Simpsonville, SC
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Simpsonville, SC
Almanac · Sunday, July 5
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
Civil dawn
5:53 AM
Sunrise
2:21 AM
Daylight
14h 24m
Sunset
4:45 PM
Civil dusk
9:16 PM
Planting note
Harvest early potatoes. Begin drying onions on the surface.
Simpsonville, SC
The moon
Waning Gibbous
73% illuminated
Moonrise
11:43 PM
Moonset
11:41 AM
In sign
♓︎ Pisces
Simpsonville, SC
Microseason
Jul 1–5

Cicadas claim the scorching afternoon

plant
Jan 151% of the yearDec 31

Read this microseason across nine climate regions →

Simpsonville at a glance

  • Today vs. normal: 79°F — typical for the season
  • Last frost: March 15 (climatological average for this latitude)
  • Microseason: Jul 1–5
  • Planting window: Harvest early potatoes. Begin drying onions on the surface.

ZIP codes: 29680, 29681

16-Day Forecast — Simpsonville

  1. Sun95°74°29%
  2. Mon93°74°42%
  3. Tue96°70°20%
  4. Wed99°71°10%
  5. Thu99°71°9%
  6. Fri102°73°15%
  7. Sat98°75°33%
  8. Sun101°77°31%
  9. Mon96°72°24%
  10. Tue100°70°14%
  11. Wed106°70°13%
  12. Thu96°67°37%
  13. Fri90°68°32%
  14. Sat95°69°32%
  15. Sun99°72°40%
  16. Mon95°74°42%

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

Right now in the garden

Peak growing season

As of July 5, 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 — Simpsonville

SPC has placed Simpsonville in the Marginal Risk category for severe thunderstorms today.

  • TODAYMRGLMarginal Risk
  • TOMORROWTSTMGeneral Thunderstorms
  • DAY 3TSTMGeneral Thunderstorms

Isolated severe storms possible. Limited threat for hail or damaging wind.

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 1–5

Cicadas claim the scorching afternoon

Dog-day cicadas emerge in waves, their rasp dominating every sunny hour; heat peaks above 90 degrees daily.

Day 186 of 365 · Wedge 37 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——
Marchlettuce, peas, spinach, radishes—
Aprillettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash—
Maytomatoes, peppers, beans, squashlettuce, peas, radishes
Junetomatoes, peppers, beans, squashlettuce, peas, radishes
July—tomatoes, beans, summer squash
August—tomatoes, beans, summer squash
September—tomatoes, beans, summer squash
Octoberfall brassicas, garlic (overwinter), carrotswinter squash, tomatoes (last)
Novemberfall brassicas, garlic (overwinter), carrots—
December——

A year in weather

The year in Simpsonville tops out in July (~80°F) and dips lowest in January (~41°F), with March wettest at 5.0 inches and October driest at 2.4 inches.

MonthMean tempPrecipRainy days
January41°4.4″14
February44°4.0″12
March52°5.0″15
April60°3.8″16
May69°3.2″17
June76°3.8″18
July80°4.3″23
August78°4.7″24
September73°4.0″16
October63°2.4″10
November51°3.8″11
December44°4.8″14

Regional context

Drawing on NOAA NCEI 1991-2020 normals, Simpsonville's January averages 41°F and July 80°F — 39°F apart — while precipitation totals roughly 48 inches over some 188 days.

Simpsonville's precipitation spreads evenly: March peaks at 5.0 inches on 14.7 wet days, while October holds 2.4 inches over 10.0 — no month dominates Simpsonville's rain calendar. That even rhythm groups Simpsonville with places like Fountain Inn, SC, Mauldin, SC and Five Forks, SC.

Simpsonville's growing window opens around mid-March, once Simpsonville's overnight lows stop freezing — sow peas, lettuce, spinach, and radishes. Hold Simpsonville's tender crops — tomatoes, peppers, basil — until 10-14 days past Simpsonville's last frost. It shuts near mid-December, when freezes return to Simpsonville and tender plants need cover. In Simpsonville, low spots run 4-7°F colder than nearby slopes, nudging Simpsonville's frost dates a week.

Similar climates: Fountain Inn, SC, Mauldin, SC, Five Forks, SC, Conestee, SC, Gantt, SC.

Frequently asked

When does it freeze in Simpsonville?
In Simpsonville, expect the last spring frost near mid-March; Simpsonville's first autumn frost comes around mid-December.
What is the rainy season in Simpsonville?
March is the wettest month in Simpsonville, about 5.0 inches on average; the year totals roughly 48 inches.
What is the warmest month in Simpsonville?
Simpsonville peaks in July, when the mean runs near 80°F.
What is the coldest month in Simpsonville?
January is Simpsonville's coldest month, averaging about 41°F.
When can I start a vegetable garden in Simpsonville?
Around mid-March, start frost-hardy crops in Simpsonville; tomatoes and basil belong a fortnight later.
How many rainy days does Simpsonville get?
Expect roughly 188 wet days a year in Simpsonville.
What hardiness zone is Simpsonville?
Since January in Simpsonville averages 41°F, Simpsonville's USDA zone follows that floor — confirm it by ZIP.
What is the 10-day forecast for Simpsonville?
Simpsonville'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 Simpsonville?
See this week's day-by-day rain chances for Simpsonville in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in Simpsonville?
Current conditions for Simpsonville and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the Simpsonville forecast updated?
The Simpsonville forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in Simpsonville?
Today's sunrise and sunset times for Simpsonville 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 Simpsonville?
The next few days in Simpsonville's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

Set in a humid subtropical zone, Simpsonville, South Carolina swings from 41°F in the heart of winter to 80°F at midsummer — a 39°F arc.

Rain and snow bring Simpsonville roughly 48 inches a year across approximately 188 measurable-precipitation days.

Simpsonville's 39°F range, set by its 34.7°N position, drives frost timing and what thrives in Simpsonville.

All cities in South Carolina →

Mauldin, SC weather →

ZIP codes in Simpsonville

  • 29680
  • 29681

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.