Sioux Falls, South Dakota Weather
Thunder stills across the plains. Day 93 of summer. Read this microseason across nine climate regions →
Sioux Falls weather forecast — hour by hour, 7-day outlook, NOAA radar
Conditions updated 9:25 AM CDT · Open-Meteo
- TodaySep 21Light Drizzle later91%0.20″56°52°—
- TuesdaySep 22Light Drizzle13%0.03″58°52°+2°
- WednesdaySep 23Light Drizzle28%0.04″64°50°+6°
- ThursdaySep 24Heavy Rain74%2.7″58°56°-6°
- FridaySep 25Light Rain38%0.27″64°57°+6°
- SaturdaySep 26Foggy47%—72°62°+8°
- SundaySep 27Overcast16%—69°51°-3°
Air quality now AQI 32 · Good
AQI 32 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 7.5 µg/m³, PM10 at 7.6 µg/m³ — typical background levels with no transport signature.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
PM × Wind × Precip
PM2.5 at 7.5 µg/m³, PM10 at 7.6 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.99
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- background
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).
September dries up ditches or breaks down bridges.
- Moonrise
- 5:11 PM
- Moonset
- 1:36 AM
- In sign
- ♑︎ Capricorn
Thunder stills across the plains
Read this microseason across nine climate regions →
All 72 microseasons on the year wheel →
Sioux Falls at a glance
- Today vs. normal: Today averages 54°F (high 56°F, low 52°F), 6°F below the 60°F normal for Sep 21
- Last frost: April 26 (1991–2020 median, NOAA station 5 km away)
- Microseason: Sep 21–25
- Planting calendar: September — plant garlic (overwinter); harvest tomatoes, peppers, beans, summer squash, winter squash
16-Day Forecast — Sioux Falls
- Mon56°52°91%
- Tue58°52°13%
- Wed64°50°28%
- Thu58°56°74%
- Fri64°57°38%
- Sat72°62°47%
- Sun69°51°16%
- Mon73°55°35%
- Tue68°51°41%
- Wed66°47°10%
- Thu65°47°8%
- Fri77°55°19%
- Sat59°46°14%
- Sun55°40°23%
- Mon58°37°19%
- Tue56°47°13%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Sioux Falls
Interactive wind and temperature map centered on Sioux Falls — it loads in your browser. Open the full weather map.
Right now in the garden
Fall planting + final harvests
As of September 21, the season's first frost (typically October 13) is approaching. Pick what frost-tender plants still carry before the next cold front. This city's planting calendar for September: plant garlic (overwinter); harvest tomatoes, peppers, beans, summer squash, and winter squash.
SPC Convective Outlook
Storm Prediction Center — Sioux Falls
SPC includes Sioux Falls in the general thunderstorm area day after tomorrow — no severe risk, but storms are possible.
- 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.
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.
Sioux Falls is the state’s largest city. The nearest town Sioux Falls tracks is Shamrock Colony, roughly 96 miles to the NW.
Air quality in Sioux Falls
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.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| April | lettuce, peas, spinach, radishes | radishes |
| May | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, spinach, radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes |
| July | tomatoes, peppers, beans, squash, fall brassicas, carrots | lettuce, peas, spinach, beans, summer squash, garlic |
| August | — | tomatoes, peppers, beans, summer squash, garlic |
| September | garlic (overwinter) | tomatoes, peppers, beans, summer squash, winter squash |
| October | — | tomatoes, peppers, beans, summer squash, winter squash, fall brassicas, carrots |
| November | — | fall brassicas, carrots |
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).
| Month | Mean temp | Precip |
|---|---|---|
| January | 16° | 0.7″ |
| February | 21° | 0.8″ |
| March | 33° | 1.5″ |
| April | 46° | 3.0″ |
| May | 59° | 3.7″ |
| June | 70° | 4.6″ |
| July | 74° | 3.3″ |
| August | 72° | 3.3″ |
| September | 63° | 3.0″ |
| October | 49° | 2.3″ |
| November | 34° | 1.2″ |
| December | 22° | 0.8″ |
Regional context
Similar climates Pine Lakes Addition, SD, Meadow View Addition, SD, Anderson, SD
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.
Summer convection drives Sioux Falls's precipitation: June logs 4.6 inches, against January's 0.7 inches — 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 April 26, 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 October 13, ending the tender-crop season. Open lawns in Sioux Falls whiten first when frost returns.
Similar climates: Pine Lakes Addition, SD, Meadow View Addition, SD, Anderson, SD, Shindler, SD, Tea, SD.
Frequently asked
- When does it freeze in Sioux Falls?
- Sioux Falls's last spring frost lands near April 26, and in Sioux Falls the first fall frost follows around October 13.
- 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 April 26 in Sioux Falls; tender peppers and squash wait 10–14 days.
- 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.
Sioux Falls sits at 43.5°N; its climate zone is warm-summer humid continental (Köppen approximation).
ZIP codes in Sioux Falls
- 57101
- 57103
- 57104
- 57105
- 57106
- 57107
- 57108
- 57109
- 57110
- 57117
- 57186
- 57193
- 57197