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

Sioux Falls, South Dakota Weather

Great rains sometimes fall. Day 43 of summer. Read this microseason across nine climate regions →

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

Sioux Falls, SD
Sunday, August 2 at 10:00 AM
72
°
Clear
Feels like
74°
Humidity
71%
Wind
6 mph
Sunrise
1:17 AM
Sunset
3:48 PM
Sioux Falls, SD
Hour by hour · 24h
24-Hour ForecastSioux Falls, SD: 24-hour forecast. Temperatures range from 67 to 89 degrees Fahrenheit.
L 67°H 89°
Sioux Falls, SD
7-day forecast
  1. Today
    Aug 2
    Clear
    —
    —
    89°58°—
  2. Monday
    Aug 3
    Overcast
    30%
    —
    93°67°+4°
  3. Tuesday
    Aug 4
    Heavy Drizzle
    65%
    —
    87°62°-6°
  4. Wednesday
    Aug 5
    Light Drizzle
    —
    —
    86°57°-1°
  5. Thursday
    Aug 6
    Overcast
    —
    —
    96°58°+10°
  6. Friday
    Aug 7
    Partly Cloudy
    13%
    —
    103°65°+7°
  7. Saturday
    Aug 8
    Light Drizzle
    13%
    —
    114°74°+11°
Sioux Falls, SD
Next 24 hours · Mild now
HOT 90°60°78°95°12p6p12a6anow 72°high 89°low 67°
Sioux Falls, SD
Anemometer · 24h winds · from true
NESW
From · True
S
173° · backing 180°
Direction
S
173°
Sustained
6
mph
Gust
11
mph
Peak 24h
16
avg 6 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 6 mph · pk 16 mph @ 1:00p
010203040MPHB1B2B3B4B5B6B7B8-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 3314SUSTGUST
−24h−18h−12h−6hnow
Light breeze backing 180° from the s.
Sioux Falls, SD
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
962.9
+1.7 mb in 3h · rising · 28.43 inHg
Now
962.9
mb
3h
+1.7
mb
12h
+0.1
mb
24h
-3.0
mb
Regime · STORM
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 961–966
955960965970975-21h-18h-15h-12h-9h-6h-3h-24hNOW966.1960.7962.9
The low is filling — pressure climbing out of storm territory.
Sioux Falls, SD
Air quality
28
AQI
Good
→-2 in 6h▲Peak ~38 @ 9 PM

AQI 28 (Good), driven by Ozone. AQI flat over the last 6 hours (within ±3 points). Ozone at AQI 33 now. With UV 4.9 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 22.

OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 9 PM.

PM 2.5Good
1.5μg/m³
PM 10Good
2μg/m³
NO₂Good
5μg/m³
OzoneDRIVERModerate
70μg/m³
UV IndexModerate
3.5

What's driving it

Ozone × UV × Sky

Ozone at AQI 33 now. With UV 4.9 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 22.

Present
AQI 33
UV peak
4.9 at 1 PM
Sky at peak
clear
Projected peak
AQI 22

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/m³300
Sioux Falls, SD
Sky cover · visibility · 24h
Cloud cover
3%
CLEAR
100%0%−24h−18h−12h−6hnow
Visibility
44.6mi
UNLIMITED
80 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
15:00 UTC · Sioux Falls, SD · 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
15:00 UTC · Sioux Falls, SD · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Sioux Falls, SD
Satellite · infrared · animated
Sioux Falls, SD
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Sioux Falls, SD
Almanac · Sunday, August 2
Red sky at night, sailor's delight.
Civil dawn
5:46 AM
Sunrise
1:17 AM
Daylight
14h 31m
Sunset
3:48 PM
Civil dusk
9:22 PM
Planting note
Sow fall peas. Start kale and collard seedlings for fall.
Sioux Falls, SD
The moon
Waning Gibbous
84% illuminated
Moonrise
10:11 PM
Moonset
10:34 AM
In sign
♓︎ Pisces
Sioux Falls, SD
Microseason
Aug 1–5

Great rains sometimes fall

insect
Jan 159% of the yearDec 31

Read this microseason across nine climate regions →

Sioux Falls at a glance

  • Today vs. normal: 13°F above the seasonal normal for this latitude
  • Last frost: May 7 (climatological average for this latitude)
  • Microseason: Aug 1–5
  • Planting window: Sow fall peas. Start kale and collard seedlings for fall.

ZIP codes: 57103, 57104, 57105, 57106, 57107, 57108, 57110, 57117 +1 more

16-Day Forecast — Sioux Falls

  1. Sun89°58°0%
  2. Mon93°67°30%
  3. Tue87°62°65%
  4. Wed86°57°6%
  5. Thu96°58°2%
  6. Fri103°65°13%
  7. Sat114°74°13%
  8. Sun96°73°12%
  9. Mon82°62°20%
  10. Tue110°68°16%
  11. Wed97°68°26%
  12. Thu90°71°24%
  13. Fri97°72°40%
  14. Sat90°55°14%
  15. Sun79°64°35%
  16. Mon93°61°26%

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

Live wind & temperature near Sioux Falls

Right now in the garden

Peak growing season

As of August 2, 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 — Sioux Falls

SPC has placed Sioux Falls in the Marginal Risk category for severe thunderstorms tomorrow.

  • TODAYNONENo severe risk
  • TOMORROWMRGLMarginal Risk
  • 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.

Sun & seasons in Sioux Falls

Sioux Falls sits in Minnehaha County, where the year’s longest day runs 15h 26m of daylight and its shortest just 8h 56m — a swing of +6h 29m between the June and December solstices. Clocks spring forward on Sunday, March 8, 2026 and fall back on Sunday, November 1, 2026.

McLaughlin, the state’s largest city, lies about 255 miles to the NW. The nearest town Sioux Falls tracks is Shamrock Colony, roughly 96 miles to the NW.

Air quality in Sioux Falls’s county has held roughly steady since 2020; its cleanest year on record was 2024 (median AQI 34). See the full air-quality history for Sioux Falls.

January 1–5: Winter settles deep on the plains.January 6–10: Arctic cold grips the heartland.January 11–15: Sunlight returns to the sloped terrain.January 16–20: Ring-necked pheasants call from cover.January 21–25: Deepest cold locks the prairie.January 26–31: Deep winter's pivot point.February 1–5: February's first breath.February 6–10: Subtle shifts in the light.February 11–15: Bald eagles concentrate on open water.February 16–20: Cold rebound before the final thaw.February 21–25: First killdeer return to thawed fields.February 26–28: Winter's veil grows thin.March 1–5: Ice withdraws from the land.March 6–10: Hibernators wake to open air.March 11–15: Spring arrives with fury and grace.March 16–20: Sandhill Cranes Rise from the Platte.March 21–25: Equinox — Night and Day Hold Balance.March 26–31: First Green Breaks Through Brown Earth.April 1–5: Thunder Voices Wake the Prairie.April 6–10: Cliff Swallows Return to Mud Nests.April 11–15: Wild Geese Wing North in Massive Flocks.April 16–20: Rainbows Follow Afternoon Storms.April 21–25: Prairie Sedges Push Through Wet Soil.April 26–30: Last Frost Retreats North.May 1–5: Wildflowers Erupt Across the Prairie.May 6–10: Grain Rains Feed the Growing Fields.May 11–15: Seedlings Rise From Frost-Free Soil.May 16–20: Roses Bloom Along the Shelter Rows.May 21–25: Summer Arrives Early in Wind and Heat.May 26–31: Frogs Begin Their Nightly Chorus.June 1–5: Prairie lightning bugs rise.June 6–10: Earthworms surface after rain.June 11–15: Toward the solstice glow.June 16–20: Lesser ripening, greater heat.June 21–25: Solstice—sun at zenith.June 26–30: Fireflies in the darkening oak.July 1–5: Cicadas claim the afternoon.July 6–10: Warm wind sweeps the tallgrass.July 11–15: Thunder builds every afternoon.July 16–20: Corn tassels and reaches peak.July 21–25: Dog days settle in haze.July 26–31: Katydid chorus erupts at dusk.August 1–5: Great rains sometimes fall.August 6–10: Autumn's edge approaches.August 11–15: Cool wind rises from the north.August 16–20: Late summer wind through tallgrass.August 21–25: Dew settles on the tallgrass.August 26–31: Monarchs gather on prairie.September 1–5: Corn tassels and heavy skies.September 6–10: Purple asters rise on the prairie.September 11–15: Hawks ride thermal currents south.September 16–20: Equinox brings balance to day.September 21–25: Thunder stills across the plains.September 26–30: Snow geese wheel through the flyway.October 1–5: Prairie enters dormancy slowly.October 6–10: Geese gather on autumn waters.October 11–15: First widespread freeze arrives.October 16–20: Oaks turn bronze and russet.October 21–25: Frost deepens through the night.October 26–31: Light rains fall on frozen ground.November 1–5: Tallgrass turns gold.November 6–10: North wind strips the oak.November 11–15: Frost locks the prairie.November 16–20: Open sky grows cold.November 21–25: First snow falls soft.November 26–30: Blizzard drives the herds.December 1–5: Deep winter takes hold.December 6–10: Sky closes cold, winter reigns.December 11–15: Darkness deepens, life retreats.December 16–20: Rivers turn to stone.December 21–25: Solstice — sun begins 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 · August 1–5

Great rains sometimes fall

Monsoon-like moisture pulses bring heavy downpours; flooding becomes a threat as prairie soils approach saturation from repeated storms.

Day 214 of 365 · Wedge 43 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——
April——
Maylettuce, peas, spinach, radisheslettuce, peas, radishes
Junelettuce, peas, spinach, radishes, tomatoes, peppers, beans, squashlettuce, peas, radishes
Julytomatoes, peppers, beans, squashtomatoes, beans, summer squash
Augusttomatoes, peppers, beans, squash, fall brassicas, garlic (overwinter), carrotstomatoes, beans, summer squash
Septemberfall brassicas, garlic (overwinter), carrotstomatoes, beans, summer squash
October—winter squash, tomatoes (last)
November——
December——

A year in weather

Sioux Falls peaks at about 74°F in July and bottoms near 16°F in January; June brings the heaviest rain (4.6 inches) and January the least (0.7 inches).

MonthMean tempPrecipRainy days
January16°0.7″2
February21°0.8″3
March33°1.5″5
April46°3.0″10
May59°3.7″12
June70°4.6″15
July74°3.3″11
August72°3.3″11
September63°3.0″10
October49°2.3″8
November34°1.2″4
December22°0.8″3

Regional context

In Sioux Falls, NOAA NCEI 1991-2020 normals put January near 16°F and July near 74°F — a 58°F seasonal arc — with about 28.3 inches of precipitation over 94 rainy or snowy days.

Summer convection drives Sioux Falls's precipitation: June logs 4.6 inches on 15.0 rainy days, against January's 0.7 inches on 2.0 — warm-season storms carry Sioux Falls's moisture. That summer-storm rhythm groups Sioux Falls with places like Pine Lakes Addition, SD, Meadow View Addition, SD and Anderson, SD.

Around late-May, Sioux Falls sheds its freezing nights — kale, peas, spinach, and parsnips go into Sioux Falls's beds. Heat-demanding starts go out a fortnight on in Sioux Falls, after the soil warms and cold snaps clear. Frost returns to Sioux Falls near early-October, ending the tender-crop season. A creek-bottom lot in Sioux Falls can lag Sioux Falls's last frost 7-10 days behind a south slope.

Similar climates: Pine Lakes Addition, SD, Meadow View Addition, SD, Anderson, SD, Shindler, SD, Tea, SD.

Naturalist notes

American robins typically return to Sioux Falls in early April, their cheerful songs marking one of spring's most reliable arrivals.

Wild plum trees usually bloom in late April across the region, their white flowers appearing before the leaves fully emerge.

Frequently asked

When does it freeze in Sioux Falls?
Sioux Falls's last spring frost lands near mid-May, and in Sioux Falls the first fall frost follows around mid-October.
What is the rainy season in Sioux Falls?
Rainfall in Sioux Falls peaks in June near 4.6 inches, out of about 28 inches annually.
What is the warmest month in Sioux Falls?
On average July tops the year in Sioux Falls at about 74°F.
What is the coldest month in Sioux Falls?
The coldest stretch in Sioux Falls falls in January, around 16°F on average.
When can I start a vegetable garden in Sioux Falls?
Hardy spring crops go in near mid-May in Sioux Falls; tender peppers and squash wait 10–14 days.
How many rainy days does Sioux Falls get?
Expect roughly 94 wet days a year in Sioux Falls.
What hardiness zone is Sioux Falls?
Because Sioux Falls bottoms near 16°F in January, that winter low sets Sioux Falls's USDA zone — verify by ZIP.
What is the 10-day forecast for Sioux Falls?
Sioux Falls'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 Sioux Falls?
See this week's day-by-day rain chances for Sioux Falls in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in Sioux Falls?
Current conditions for Sioux Falls and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the Sioux Falls forecast updated?
The Sioux Falls forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in Sioux Falls?
Today's sunrise and sunset times for Sioux Falls 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 Sioux Falls?
The next few days in Sioux Falls's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

The warm-summer humid continental climate of Sioux Falls, South Dakota carries typical Januarys near 16°F and Julys around 74°F — 58°F of seasonal travel.

Rain and snow bring Sioux Falls roughly 28 inches a year across approximately 94 measurable-precipitation days.

From 43.5°N, Sioux Falls sees a 58°F seasonal swing that governs Sioux Falls's planting and frost windows.

All cities in South Dakota →

ZIP codes in Sioux Falls

  • 57108
  • 57104
  • 57105
  • 57106
  • 57107
  • 57103
  • 57197
  • 57110
  • 57117
  • 57101
  • 57109
  • 57186
  • 57193

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.