A Sunny, Warm Start to the Week

It is the first week of school for a lot of kids and we are off to a relatively quiet, summery start. Today will be mostly sunny, warm and humid with temperatures ranging from the mid to low low 80s in Sioux Falls to the mid to upper 80s along the James River to the low 90s across central South Dakota. Scattered thunderstorms are possible along the James River late this afternoon into this evening with storms redeveloping along and east of I-29 late this evening and overnight tonight. The overall severe weather threat for later today and tonight is low, however, one or two storms could produce marginally severe hail, straight line wind gusts or even a weak tornado.

After one more warm, humid day tomorrow, cooler air will arrive and take us comfortably through the rest of the week. Wednesday, Thursday and Friday will be mostly sunny with below average high temperatures in the upper 70s to low 80s.

Scattered thunderstorms are back in the forecast for late Friday, Friday night into Saturday morning. After that, the rest of the upcoming weekend is looking good. Saturday and Sunday will be partly cloudy with just a slight chance of a random, isolated thunderstorm. Highs will be slightly warmer – in the low to mid 80s – this weekend.

 

Sioux Falls Area Forecast
Updated by Meteorologist Shawn Cable on Monday, August 19 at 3:42 AM

TODAY:

Mostly sunny, warm and humid. High: 83°. Wind: South 10 to 20 mph.

TONIGHT:
Partly cloudy with scattered thunderstorms late. Low: 68°. Wind: South 5 to 15 mph.

TOMORROW:
Partly cloudy, warmer and more humid. High: 87°. Wind: West becoming north 5 to 15 mph.

A Sunny, Comfortable Start to the Week

Our weather is going to be quiet and comfortable for the last few days of July. Today and tomorrow will be sunny with below average high temperatures in the upper 70s. After an isolated thunderstorm or two on Tuesday night, Wednesday will be slightly warmer and just a bit more humid.

Thursday will be right on par for the first day of August. Partly cloudy and muggy with high temperatures in the mid 80s. Friday will be partly cloudy with a chance of thunderstorms in the morning and again in the afternoon and at night.

Weather for the upcoming weekend is looking fantastic. A few lingering thunderstorms are possible Saturday morning, then it will be partly cloudy, warm and humid with high temps in the low to mid 80s.

Storms Today… Sunny, Not Humid Tomorrow

Today will be warm and humid with scattered storms. In Sioux Falls, the best chance of storms will be this morning as scattered thunderstorms move across much of central and eastern South Dakota into Minnesota and Iowa. Another line of storms will develop across northern and northeastern South Dakota this afternoon with yet another line of thunderstorms possible across western and central South Dakota late this afternoon into this evening. The last line of storms will dissipate as it moves east overnight.

As I mentioned, today will be warm and muggy. High temps will be back in the mid 80s with a dew point in the low 70s. That will pull the heat index back into the low 90s this afternoon.

A cold front will slide east of our region overnight, taking the heat, humidity and storms along with it. Wednesday will be windy and cooler with high temps around 80 degrees. Thursday will be sunny and warmer but still not terribly humid.

Enjoy the break from the heat and humidity on Wednesday and Thursday, because the summer sauna will be cranked to the maximum all weekend. High temperatures will reach the upper 80s to low 90s with the heat index approaching 100 degrees on Friday, Saturday and Sunday. The weekend will be mostly sunny with just a slight chance of a random, isolated thunderstorm.

I don’t think we’re going to get much of a break from the heat, either. Long range models suggest that the warm, humid pattern will last well into next week.

Flash Flood Warning United StatesNational Weather Alerts

Flash Flood Warning
...flash Flood Warning Remains In Effect Until 3 Am Ast Early This Morning For Saint John And Saint Thomas... At 109 Am Ast, Doppler Radar Indicated Thunderstorms Producing Heavy Rain Across The Warned Area. Between 1 And 4 Inches Of Rain Have Fallen. Additional Rainfall Amounts Of 1 To 3 Inches Are Possible In The Warned Area. Flash Flooding Is Ongoing Or Expected To Begin ...Read More.
Effective: October 4, 2023 at 1:09amExpires: October 4, 2023 at 3:00amTarget Area: Saint John; Saint Thomas

Flash Flood Warning
...flash Flood Warning Remains In Effect Until 3 Am Ast Early This Morning For Saint Croix... At 108 Am Ast, Doppler Radar Indicated Thunderstorms Producing Heavy Rain Across The Warned Area. Between 1 And 3 Inches Of Rain Have Fallen. Additional Rainfall Amounts Of 1 To 3 Inches Are Possible In The Warned Area. Flash Flooding Is Ongoing Or Expected To Begin ...Read More.
Effective: October 4, 2023 at 1:08amExpires: October 4, 2023 at 3:00amTarget Area: Saint Croix

Flood Warning
...the Flood Warning Continues For The Following Rivers In Florida... St Johns River Near Astor Affecting Lake And Volusia Counties. .recent Heavy Rainfall Over And Upstream From Astor Combined With Northeast Winds Have Brought The Saint Johns River At Astor Into Moderate Flood. River Levels Are Forecast To Remain In Moderate Flood Between 3.0 And 3.1 Feet Through The Weekend. ...Read More.
Effective: October 3, 2023 at 9:22pmExpires: October 4, 2023 at 11:00amTarget Area: Lake; Volusia

Flood Warning
...the Flood Warning Continues For The Following Rivers In Florida... Peace River At Arcadia At Sr 70 Affecting Desoto County. For The Peace...including Bartow, Zolfo Springs At Sr 17, Arcadia At Sr 70...minor Flooding Is Forecast. ...flood Warning Remains In Effect Until Early Friday Morning... * What...minor Flooding Is Occurring And Minor Flooding Is Forecast. ...Read More.
Effective: October 3, 2023 at 8:33pmExpires: October 6, 2023 at 2:00amTarget Area: DeSoto

Flood Warning
...the Flood Warning Continues For The Following Rivers In Florida... Fisheating Creek Near Palmdale Affecting Glades County. For The Fisheating Creek...including Palmdale...minor Flooding Is Forecast. ...flood Warning Remains In Effect Until Further Notice... * What...minor Flooding Is Occurring And Minor Flooding Is Forecast. ...Read More.
Effective: October 3, 2023 at 12:05pmExpires: October 4, 2023 at 12:15pmTarget Area: Glades

Flood Warning
...flood Warning In Effect Until 145 Am Cdt Wednesday... * What...small Stream Flooding Caused By Excessive Rainfall Is Occurring. * Where...a Portion Of Western Texas, Including The Following County, Scurry. * When...until 145 Am Cdt. ...Read More.
Effective: October 3, 2023 at 10:36pmExpires: October 4, 2023 at 1:45amTarget Area: Scurry

Freeze Warning
...freeze Warning In Effect From 3 Am To 9 Am Mdt Wednesday... ...freeze Watch In Effect From Late Wednesday Night Through Thursday Morning... * What...for The Freeze Warning, Sub-freezing Temperatures As Low As 31 Expected. For The Freeze Watch, Sub-freezing Temperatures As Low As 29 Possible. ...Read More.
Effective: October 3, 2023 at 6:30pmExpires: October 4, 2023 at 9:00amTarget Area: Alamosa Vicinity, Central San Luis Valley Below 8500 Ft; Del Norte Vicinity, Northern San Luis Valley Below 8500 Ft; Southern San Luis Valley

Freeze Warning
...freeze Warning Remains In Effect From 3 Am To 8 Am Mdt Wednesday... * What...sub-freezing Temperatures As Low As 29 Expected. * Where...upper Rio Grande Valley. * When...from 3 Am To 8 Am Mdt Wednesday. * Impacts...frost And Freeze Conditions Could Kill Crops, Other ...Read More.
Effective: October 3, 2023 at 9:45pmExpires: October 4, 2023 at 8:00amTarget Area: Upper Rio Grande Valley

Freeze Warning
...freeze Warning In Effect From 3 Am To 9 Am Mdt Wednesday... * What...sub-freezing Temperatures As Low As 28 Degrees Expected. * Where...sanpete Valley And Southwest Utah. * When...from 3 Am To 9 Am Mdt Wednesday. * Impacts...frost And Freeze Conditions Will Kill Crops, Other Sensitive Vegetation And Possibly Damage Unprotected Outdoor ...Read More.
Effective: October 3, 2023 at 3:09pmExpires: October 4, 2023 at 9:00amTarget Area: Sanpete Valley; Southwest Utah