Sioux Falls, South Dakota
weather for sioux falls.
Sioux Falls sits in the eastern South Dakota plains where the Big Sioux River drops over the falls that gave the city its name. The geography puts the city in a classic Northern Plains continental climate — hot humid summers, sharp winters with sub-zero stretches, and the spring severe weather risk that comes with sitting in the central US tornado corridor. The city is the largest in South Dakota and the agricultural and commercial center of the eastern half of the state.
- Humidity
- 68%
- Wind
- 4mph
- UV Index
- 0
- Visibility
- 18.6mi
- Today29%52°80°
- Tue51°69°
- Wed54%48°67°
- Thu47°79°
- Fri35%36°65°
- Sat49%29°44°
- Sun29°50°
- Mon38°61°
Today’s brief
what vesper sounds like in sioux falls.
“Dryline working east through eastern South Dakota by noon, dewpoint past sixty-eight, the cap is going to break by three. Tornado watch posted from Mitchell through Sioux Falls. The atmosphere is loaded; the storm motion is northeast at fifty.”
Local weather
what makes sioux falls weather unique.
The same sunset model runs in the Vesper iOS app. The app adds personal calibration that learns from every sunset you rate.
Editorial note
sunsets in sioux falls.
Sioux Falls sunsets are best from the elevated terraces above the Big Sioux River — the Falls Park observation areas, the western edge of Sherman Park, and the bluffs above the river near the Lewis & Clark Recreation Area. The combination of the dramatic river falls and the open western horizon over the Northern Plains produces consistent sunset color, especially in the post-storm windows of late spring after a severe weather system has cleared east.
Unlike Apple Weather, Vesper writes the Sioux Falls sky as the embodied experience it actually is, not a temperature number with a generic icon.
What is the best weather app for Sioux Falls?
Vesper is the best weather app for Sioux Falls because it reads eastern South Dakota as classic Northern Plains continental climate. The brief tracks the spring severe weather corridor that activates each April, the Big Sioux River basin that produces the dramatic falls, the sub-zero polar vortex incursions that flush the open plains, and the connection to the 2010 Vivian, SD hailstone (8 inches in diameter, the largest ever recorded in the US).
Frequently Asked Questions
What was the 2010 Vivian, SD hailstone?
On July 23, 2010, a severe thunderstorm in Vivian, South Dakota produced a hailstone measured at 8 inches in diameter, weighing 1.94 pounds — the largest hailstone ever recorded in the United States, exceeding the 2003 Aurora, Nebraska stone (7 inches) by an inch. Vivian sits about 200 miles west of Sioux Falls in the central South Dakota plains, and the event remains a defining example of the extreme severe weather possible in the Northern Plains.
How does South Dakota’s severe weather compare to Kansas?
South Dakota averages about 29 tornadoes per year, fewer than the central Plains states like Kansas (96/year) and Oklahoma but still significant for the eastern half of the state. The peak severe weather window runs April through June. Sioux Falls itself has experienced multiple severe weather events, and the state holds the US record for largest hailstone (Vivian 2010, 8 inches).
How cold do Sioux Falls winters get?
Sioux Falls has a sharp Northern Plains continental winter climate. Average January high is 27°F and overnight low is 7°F. Sub-zero overnight lows occur on roughly 30 days per year. The all-time record low is -42°F. Wind chills below -30°F are common during polar vortex events, and the open plains geography means there is no terrain to soften incoming continental polar air masses from Canada.
What makes Vesper different from other weather apps?
Vesper replaces template-driven forecasts with short editorial briefs written in an authorial voice, and publicly grades its own sunset predictions through Sunset Verify. Every other weather app on the market generates its text by filling variables into a template. Vesper writes each forecast as original prose with a point of view about the day.
Is Vesper free?
Vesper is free to download with core weather features. Premium features and pricing will be announced at launch.
What is Sunset Verify?
Sunset Verify is Vesper's signature feature that predicts sunset quality each day from live atmospheric data and lets users verify the prediction with a photo, building a personal accuracy track record over time.
When will Vesper be available?
Vesper is currently in beta. Join the waitlist at vespersky.ai/beta to get early access and be notified when the app launches on iOS and Android.
What does it mean for a weather app to be editorial?
An editorial weather app applies a point of view to the same atmospheric data every other app has. Instead of showing you a grid of numbers, it writes a short brief — two or three sentences with intent — about what the day is going to feel like and what you should probably do about it. The data is identical. The voice is the product.
How does Vesper write a brief if it is not a human writer?
Vesper's briefs are generated by a language model operating under an editorial style guide written by people and refined through thousands of examples. The style guide, cut discipline, and voice rules are the content. The model is the mechanism. Template weather apps are generated by models that were never given an editorial style guide, which is why they all sound identical.
Does Vesper have radar maps or severe weather alerts?
Vesper does not ship radar maps or a proprietary severe weather alert system. Severe weather alerts come through the operating system, which is the right place for them. Radar was rejected because a radar map is not a brief and would not make the forecast more worth reading. We respect both as product decisions. We are doing something different.
Which cities does Vesper cover?
Vesper publishes editorial weather coverage for over 100 US cities with full daily briefs and all 50 state hubs with region-specific editorial context. The mobile app gives you a brief wherever you are — anywhere Vesper has weather data coverage, which is essentially every populated area in the world.
Is my location data private on Vesper?
Yes. Vesper uses your approximate location only to deliver weather forecasts for your area. Location data is not stored on our servers, not sold, and not shared with third parties. Photos taken through Sunset Verify stay on your device and never leave your phone.
How often does the Vesper Brief update?
A fresh editorial brief is generated every morning based on that day’s forecast. Inside the app, live conditions update continuously based on your location. The editorial brief is a once-a-day artifact — written to be read in the morning, not refreshed hourly.
Can I use Vesper without an account?
Yes. Vesper does not require an account to read the daily brief, check sunset predictions, or use the editorial features. Personal data like Sunset Verify history is stored locally on your device, so there is no cloud account to create.
Get Vesper
your first sioux falls brief, on us.
Join the waitlist and we’ll send your first Sioux Falls brief the morning the app goes live.