Sioux Falls, South Dakota Weather
Prairie lightning bugs rise. Day 78 of spring. Read this microseason across nine climate regions →
Sioux Falls weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast34%—86°65°—
- FridayJun 5Overcast11%—89°65°+3°
- SaturdayJun 6Mostly Clear——94°65°+5°
- SundayJun 7Overcast38%—86°67°-8°
- MondayJun 8Overcast29%—87°65°+1°
- TuesdayJun 9Thunderstorm26%0.23″89°65°+2°
- WednesdayJun 10Thunderstorm16%—97°70°+8°
AQI 47 (Good), driven by Ozone. AQI up 8 over the last 6 hours (gradual rise). Ozone at AQI 39 now. With UV 0.0 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 9 by mid-afternoon.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 39 now. With UV 0.0 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 9 by mid-afternoon.
- Present
- AQI 39
- UV peak
- 0.0 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 9
PM × Wind × Precip
PM2.5 at 5.1 µg/m³, PM10 at 5.4 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.94
- Wind
- breezy
- 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).
The higher the clouds, the finer the weather.
- Moonrise
- 5:38 AM
- Moonset
- 3:26 PM
- In sign
- ♒︎ Aquarius
Prairie lightning bugs rise
Sioux Falls at a glance
- Today vs. normal: 4°F above the seasonal normal for this latitude
- Last frost: May 7 (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 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 — Sioux Falls
SPC has placed Sioux Falls in the Marginal Risk category for severe thunderstorms today.
- TODAYMRGLMarginal Risk
- TOMORROWMRGLMarginal Risk
- DAY 3NONENo severe risk
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.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | — | — |
| February | — | — |
| March | — | — |
| April | — | — |
| May | lettuce, peas, spinach, radishes | lettuce, peas, radishes |
| June | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| July | tomatoes, peppers, beans, squash | tomatoes, beans, summer squash |
| August | tomatoes, peppers, beans, squash, fall brassicas, garlic (overwinter), carrots | tomatoes, beans, summer squash |
| September | fall brassicas, garlic (overwinter), carrots | tomatoes, beans, summer squash |
| October | — | winter squash, tomatoes (last) |
| November | — | — |
| December | — | — |
A year in weather
July ranks as Sioux Falls's warmest month with mean temperatures around 74°F, while January stands as the coldest at roughly 16°F. June brings peak rainfall at 4.6 inches, contrasting sharply with January's modest 0.7 inches.
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 16° | 0.7″ | 2 |
| February | 21° | 0.8″ | 3 |
| March | 33° | 1.5″ | 5 |
| April | 46° | 3.0″ | 10 |
| May | 59° | 3.7″ | 12 |
| June | 70° | 4.6″ | 15 |
| July | 74° | 3.3″ | 11 |
| August | 72° | 3.3″ | 11 |
| September | 63° | 3.0″ | 10 |
| October | 49° | 2.3″ | 8 |
| November | 34° | 1.2″ | 4 |
| December | 22° | 0.8″ | 3 |
Regional context
The city falls within the warm-summer humid continental climate region, sharing temperature ranges and seasonal rhythms with other nearby cities that experience similar growing conditions.
Similar climates: Rapid City, SD, Aberdeen, SD, Brookings, SD, Watertown, SD, Mitchell, 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?
- Spring's final frost in Sioux Falls typically occurs around mid-May, while the first fall frost generally arrives near mid-October.
- What is the rainy season in Sioux Falls?
- June stands as the wettest month, delivering approximately 4.6 inches of rain, while the city's annual total reaches roughly 28 inches.
- What is the warmest month in Sioux Falls?
- July typically records the highest temperatures, with averages around 74°F.
- What is the coldest month in Sioux Falls?
- January brings the coldest conditions, averaging approximately 16°F.
- When can I start a vegetable garden in Sioux Falls?
- Cool-season crops like peas and lettuce can be planted around the last spring frost in mid-May, while warm-season varieties such as tomatoes and peppers should wait 1–2 weeks after.
- How many rainy days does Sioux Falls get?
- The city experiences about 94 rainy days annually on average.
- What hardiness zone is Sioux Falls?
- Sioux Falls's USDA hardiness zone reflects its lowest average winter temperatures; the USDA's online lookup tool can provide the current zone designation using the city ZIP code.
Climate
Sioux Falls, South Dakota experiences a warm-summer humid continental climate. Winter temperatures in January typically hover near 16°F, while July brings averages around 74°F, creating a 58°F seasonal swing.
Annual precipitation totals about 28 inches, distributed across roughly 94 rainy days throughout the year.
Location at 43.5°N latitude, along with proximity to large water bodies and elevation, determines the fundamental patterns here. These factors influence plant growth cycles, frost timing, and daily weather conditions.