Don Day's Wyoming Weather Forecast: Thursday, September 18, 2025

Sunny in Wyoming on Thursday and partly cloudy to mostly clear overnight. Highs from the low 60s to the mid 70s and lows in the 30s and 40s.

CK
Coy Knobel

September 18, 20253 min read

Sublette County
Sunset over the New Fork River outside of Boulder, Wyoming.
Sunset over the New Fork River outside of Boulder, Wyoming. (Reader photo: Craig Marple)

Sunny in Wyoming on Thursday and partly cloudy to mostly clear overnight. Highs from the low 60s to the mid 70s and lows in the 30s and 40s.

Central:  

Casper:  Becoming sunny today with a high near 72 and mostly clear overnight with a low near 44.

Lander:  Sunny today with a high near 74 and mostly clear overnight with a low near 46.

Jeffrey City:  Sunny today with a high near 71 and mostly clear overnight with a low near 40.

Southwest:  

Evanston Sunny today with a high near 72 and mostly cloudy overnight with a low near 40.

Rock Springs:  Sunny today with a high near 72 and partly cloudy overnight with a low near 41.

Kemmerer:  Sunny today with a high near 72 and partly cloudy overnight with a low near 40.

Western Wyoming:  

Pinedale:  Sunny today with a high near 69 and partly cloudy overnight with a low near 34. 

Afton:  Sunny today with a high near 74 and partly cloudy overnight with a low near 40. 

La Barge:  Sunny today with a high near 72 and partly cloudy overnight with a low near 38.

Northwest: 

Dubois Sunny today with a high near 69 and wind gusts as high as 20 mph. Mostly clear overnight with a low near 40 and wind gusts as high as 20 mph 

Jackson:  Sunny today with a high near 74 and partly cloudy overnight with a low near 37 

Old Faithful in Yellowstone National Park:  Sunny today with a high near 69 and mostly clear overnight with a low near 32.

­­Bighorn Basin:  

Thermopolis Sunny today with a high near 77 and mostly clear overnight with a low near 46.

Cody:  Sunny today with a high near 75 and mostly clear overnight with a low near 49. 

Greybull:  Sunny today with a high near 76 and mostly clear overnight with a low near 46.

North Central:  

Buffalo:  Sunny today with a high near 70 and mostly clear overnight with a low near 49.

Sheridan:  Patchy fog before 9 a.m., otherwise sunny today with a high near 75 and mostly clear overnight with a low near 42.

Big Horn:  Sunny today with a high near 74 and mostly clear overnight with a low near 46.

Northeast:  

Gillette:  Gradually becoming sunny today with a high near 70 and partly cloudy overnight with a low near 44.

Newcastle:  Sunny today with a high near 69 and mostly clear overnight with a low near 45.

Sundance:  Slight chance of rain before noon, gradually becoming sunny today with a high near 62 and partly cloudy overnight with a low near 44.

Eastern Plains:  

Torrington:  Mostly sunny today with a high near 71 and mostly clear overnight with a low near 44.

Douglas:  Patchy fog before 7 a.m., otherwise sunny today with a high near 72 and mostly clear overnight with a low near 41.

Wright:  Gradually clearing skies today with a high near 70 and mostly clear overnight with a low near 43.

Southeast:  

Cheyenne:  Sunny today with a high near 68 and mostly clear overnight with a low near 44.

Laramie:  Mostly sunny today with a high near 63 and mostly clear overnight with a low near 38.

Medicine Bow:  Sunny today with a high near 67 and mostly clear overnight with a low near 37.

South Central:  

Rawlins:  Sunny today with a high near 68 and mostly clear overnight with a low near 41.

Saratoga:  Sunny today with a high near 67 and mostly clear overnight with a low near 37.

Hanna:  Sunny today with a high near 66 and mostly clear overnight with a low near 39.

Authors

CK

Coy Knobel

Night Editor