Weather Warnings for Wyoming

Issued by the National Weather Service

Current watches, warnings, and advisories for Wyoming
Alerts Updated: July 31, 2026, 9:34 pm  UTC


Red Flag Warning issued July 31 at 1:23PM MDT until August 2 at 9:00PM MDT by NWS Billings MT

Summary: The National Weather Service in Billings has issued a Red Flag Warning...which is in effect from midnight Saturday night to 9 PM MDT Sunday. * IMPACTS: Low humidities, hot temperatures, and gusty winds associated with a cold front will create erratic fire behavior. * AFFECTED AREA: In North Central WY Fire Zones...274...284. In South Central MT Fire Zone...129. In Southeast MT Fire Zones...130...131...132. * COUNTIES AFFECTED: In North Central WY...Big Horn...Johnson...Sheridan...Washakie. In South Central MT...Big Horn...Carbon...Yellowstone. In Southeast MT...Custer...Powder River...Rosebud...Treasure. * COLD FRONT: A cold front moves through Saturday night bringing increased winds. * WIND: South winds early Sunday switching to the north 10 to 20 mph with gusts up to 35 mph. * HUMIDITY: As low as 10 percent. * TEMPERATURES: Up to 100 degrees.
Severity:  Severe    Effective:  July 31, 2026, 1:23 pm      Expires:  August 1, 2026, 1:30 pm
Area:  Crow Indian Reservation/Big Horn Canyon Rec Area; Northern Rosebud/Northern Treasure Counties; Northern Cheyenne Indian Reservation/Ashland Ranger District Custer Natl Forest; Custer County; Sheridan County/Casper BLM; Bighorn National Forest


Heat Advisory issued July 31 at 12:58PM MDT until August 2 at 9:00PM MDT by NWS Cheyenne WY

Summary: * WHAT...High temperatures between 103 to 108 degrees. * WHERE...Portions of panhandle Nebraska and east central and southeast Wyoming. * WHEN...From 11 AM to 9 PM MDT Sunday. * IMPACTS...Hot temperatures may cause heat illnesses.
Severity:  Moderate    Effective:  July 31, 2026, 12:58 pm      Expires:  August 1, 2026, 6:00 am
Area:  Dawes; Box Butte; Scotts Bluff; Banner; Morrill; North Sioux; South Sioux; Converse County Lower Elevations; Niobrara County; East Platte County; Goshen County


Heat Advisory issued July 31 at 12:58PM MDT until August 2 at 9:00PM MDT by NWS Cheyenne WY

Summary: * WHAT...High temperatures between 95 and 100 degrees. * WHERE...Central Carbon County, Ferris/Seminoe/Shirley Mountains, and Southwest Carbon County. * WHEN...From 11 AM to 9 PM MDT Sunday. * IMPACTS...Hot temperatures may cause heat illnesses.
Severity:  Moderate    Effective:  July 31, 2026, 12:58 pm      Expires:  August 1, 2026, 6:00 am
Area:  Ferris/Seminoe/Shirley Mountains; Central Carbon County; Southwest Carbon County


Heat Advisory issued July 31 at 12:58PM MDT until August 2 at 9:00PM MDT by NWS Cheyenne WY

Summary: * WHAT...High temperatures between 97 and 103 degrees. * WHERE...In Nebraska, Cheyenne County and Kimball County. In Wyoming, Central Laramie County and East Laramie County. * WHEN...From 11 AM to 9 PM MDT Sunday. * IMPACTS...Hot temperatures may cause heat illnesses.
Severity:  Moderate    Effective:  July 31, 2026, 12:58 pm      Expires:  August 1, 2026, 6:00 am
Area:  Kimball; Cheyenne; Central Laramie County; East Laramie County


Extreme Heat Warning issued July 31 at 12:29PM MDT until August 2 at 12:00AM MDT by NWS Billings MT

Summary: * WHAT...Dangerously hot conditions with high temperatures of 100 to 108 expected. * WHERE...Portions of central, south central, and southeast Montana and north central Wyoming. * WHEN...From noon Saturday to midnight MDT Saturday Night. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...Low temperatures are expected to be in the 70s for some locations east of Billings Saturday night bringing limited overnight relief.
Severity:  Severe    Effective:  July 31, 2026, 12:29 pm      Expires:  August 1, 2026, 12:30 pm
Area:  Musselshell; Treasure; Northern Rosebud; Custer; Fallon; Northern Stillwater; Powder River; Carter; Northern Park; Golden Valley; Red Lodge Foothills; Northern Big Horn; Southern Rosebud; Judith Gap; Paradise Valley; Livingston Area; Beartooth Foothills; Southern Big Horn; Southeastern Carbon; Northern Sweet Grass; Bighorn Canyon; Northern Carbon; Melville Foothills; Northeastern Yellowstone; Southern Wheatland; Southwestern Yellowstone; Sheridan Foothills


Heat Advisory issued July 31 at 9:58AM MDT until August 2 at 10:00PM MDT by NWS Riverton WY

Summary: * WHAT...Very hot temperatures expected this weekend. Highs from 98 to 105 below 5500 feet, 90 to 98 above 5500 feet. * WHERE...Portions of central, north central, northwest, south central, southwest, and west central Wyoming. * WHEN...From noon Saturday to 10 PM MDT Sunday. * IMPACTS...Heat related illnesses increase during extreme heat events. * ADDITIONAL DETAILS...Some locations will not see temperatures fall below 90 degrees until sunset.
Severity:  Moderate    Effective:  July 31, 2026, 9:58 am      Expires:  August 1, 2026, 7:00 am
Area:  Cody Foothills; North Bighorn Basin; Southwest Bighorn Basin; Southeast Bighorn Basin; Northeast Johnson County; Southeast Johnson County; Jackson Hole; Upper Wind River Basin; Wind River Basin; Lander Foothills; Green Mountains and Rattlesnake Range; Natrona County Lower Elevations; Star Valley; Upper Green River Basin Foothills; Upper Green River Basin; South Lincoln County; Rock Springs and Green River; Flaming Gorge; East Sweetwater County


Fire Weather Watch issued July 31 at 9:54AM MDT until August 2 at 9:00PM MDT by NWS Riverton WY

Summary: The National Weather Service in Riverton has issued a Fire Weather Watch, which is in effect from Sunday afternoon through Sunday evening. * IMPACTS: Low Humidities...Unseasonably Warm Temperatures...and Wind Shift with a Cold Front could cause erratic fire behavior. * AFFECTED AREA: In Central WY Fire Zones...283...285. In North Central WY Fire Zones...275...276...282. * COUNTIES AFFECTED: In Central WY...Fremont...Natrona. In North Central WY...Big Horn...Hot Springs...Johnson...Park Washakie. * COLD FRONT: * WIND: West 10 to 20 mph with gusts up to 35 mph. * HUMIDITY: As low as 6 percent. * TEMPERATURES: Highs around 100.
Severity:  Severe    Effective:  July 31, 2026, 9:54 am      Expires:  August 1, 2026, 7:00 am
Area:  North Bighorn Basin/Worland BLM; Cody Foothills; South Bighorn Basin/Worland BLM; Upper Wind River Basin/Wind River Basin; South Bighorn Mountains


Fire Weather Watch issued July 31 at 9:54AM MDT until August 3 at 9:00PM MDT by NWS Riverton WY

Summary: The National Weather Service in Riverton has issued a Fire Weather Watch, which is in effect from Sunday afternoon through Monday evening. * IMPACTS: Low Humidities...Unseasonably Warm Temperatures...and Wind Shift with a Cold Front could cause erratic fire behavior. * AFFECTED AREA: In Central WY Fire Zone....289. In Southwest WY Fire Zones...277...279. In West Central WY Fire Zone....278. * COUNTIES AFFECTED: In Central WY...Fremont...Natrona. In Southwest WY...Sweetwater...Uinta. In West Central WY...Lincoln...Sublette. * COLD FRONT: * WIND: West 10 to 20 mph with gusts up to 35 mph. * HUMIDITY: As low as 6 percent Sunday and 8 percent Monday. Poor humidity recovery Sunday night to around 20 to 35 percent. * TEMPERATURES: Highs in the mid-to-upper 90s Sunday and around 90 Monday.
Severity:  Severe    Effective:  July 31, 2026, 9:54 am      Expires:  August 1, 2026, 7:00 am
Area:  Lincoln and Uinta Counties/Lower Elevations; Upper Green River Basin/Rock Springs BLM; Sweetwater County/Rock Springs BLM/Flaming Gorge NRA; Granite/Green/Ferris/Rattlesnake Mountains