Don Day's Wyoming Weather Forecast: Tuesday, August 18, 2026

Chance of rain, otherwise partly to mostly sunny in Wyoming on Tuesday. Severe storms possible in the southeast. Chance of rain in some locations overnight.  Highs in the 70s and 80s. Lows from the low 40s to upper 50s.

CK
Coy Knobel

August 18, 20266 min read

Fremont County
Sunset along the Middle Fork of the Popo Agie above Lander.
Sunset along the Middle Fork of the Popo Agie above Lander. (Reader photo: Dick Lefevre)

Chance of rain, otherwise partly to mostly sunny in Wyoming on Tuesday. Severe storms possible in the southeast. Chance of rain in some locations overnight.  Highs in the 70s and 80s. Lows from the low 40s to upper 50s.

 

Central:  

CasperSlight chance of rain after 4 p.m., breezy, gradually becoming mostly sunny today with a high near 83 and wind gusts as high as 21 mph. Mostly cloudy overnight with a chance of rain mainly before 9 p.m. and a low near 54.

Lander:  Chance of rain, breezy, becoming mostly sunny today with a high near 83 and wind gusts as high as 24 mph. Partly cloudy and breezy overnight with a slight chance of rain before 7 p.m., a low near 56 and wind gusts as high as 23 mph.

Jeffrey City:   Chance of rain mainly after 3 p.m., breezy, gradually becoming mostly sunny today with a high near 81 and wind gusts as high as 25 mph. Partly cloudy overnight with a slight chance of rain before 9 p.m., a low near 51 and wind gusts as high as 21 mph.

 

Southwest:  

Evanston:   Slight chance of rain, otherwise mostly sunny today with a high near 81 and partly cloudy overnight with a low near 52.

Rock Springs:   Chance of rain mainly after 3 p.m., breezy, gradually becoming mostly sunny today with a high near 85 and wind gusts as high as 24 mph. Partly cloudy and breezy overnight with a low near 55 and wind gusts as high as 23 mph.

Lyman:   Chance of rain, otherwise partly sunny today with a high near 82 and partly cloudy overnight with a low near 53.

 

Western Wyoming:  

Pinedale:   Chance of rain, increasing clouds and breezy today with a high near 76 and wind gusts as high as 23 mph. Partly cloudy overnight with a low near 45.

Afton:  Chance of rain, otherwise partly sunny today with a high near 80 and partly cloudy overnight with a low near 48.

La Barge:  Chance of rain mainly after 5 p.m., otherwise partly sunny and breezy today with a high near 79 and wind gusts as high as 26 mph. Partly cloudy overnight with a low near 46 and wind gusts as high as 20 mph.

 

Northwest: 

Dubois:  Chance of rain after 4 p.m., otherwise partly sunny and breezy today with a high near 74 and wind gusts as high as 29 mph. Partly cloudy and breezy overnight with a slight chance of rain before 11 p.m., a low near 46 and wind gusts as high as 25 mph.

Jackson:  Slight chance of rain, mostly cloudy today with a high near 81 and wind gusts as high as 21 mph. Partly cloudy overnight with a slight chance of rain before 7 p.m. and a low near 44.

Old Faithful in Yellowstone National Park:  Chance of rain mainly after 3 p.m., otherwise partly sunny today with a high near 74 and wind gusts as high as 20 mph. Partly cloudy overnight with a chance of rain before 11 p.m. and a low near 38.

 

Bighorn Basin:  

Thermopolis:  Chance of rain mainly after 5 p.m., breezy, becoming mostly sunny today with a high near 85 and wind gusts as high as 25 mph. Partly cloudy overnight with a slight chance of rain before 11 p.m. and a low near 56.

Cody:  Chance of rain, otherwise partly sunny and breezy today with a high near 80 and wind gusts as high as 26 mph. Partly cloudy overnight with a chance of rain mainly before 10 p.m. and a low near 54.

Greybull:  Chance of rain after 3 p.m., otherwise partly sunny and breezy today with a high near 85 and wind gusts as high as 28 mph. Partly cloudy overnight with a chance of rain before 11 p.m. and a low near 55.

 

North Central:  

Buffalo:   Chance of rain, otherwise partly sunny today with a high near 79 and partly cloudy overnight with a chance of rain before midnight and a low near 57.

Sheridan:   Chance of rain mainly after 3 p.m., otherwise partly sunny today with a high near 83 and mostly cloudy overnight with a chance of rain before 9 p.m., patchy fog after 3 a.m. and a low near 50.

Story:   Chance of rain mainly after 1 p.m., otherwise partly sunny today with a high near 78 and mostly cloudy overnight with a chance of rain before 10 p.m. and a low near 53.

 

Northeast:  

Gillette:  Slight chance of rain after noon, otherwise partly sunny today with a high near 81 and wind gusts as high as 21 mph. Cloudy, gradually becoming partly cloudy overnight with a chance of rain before midnight, a low near 54 and wind gusts as high as 20 mph.

Newcastle:   Partly sunny today with a high near 81 and wind gusts as high as 17 mph. Mostly cloudy overnight with a chance of rain mainly before midnight and a low near 55.

Sundance:  Slight chance of rain after noon, otherwise partly sunny today with a high near 79 and wind gusts as high as 16 mph. Mostly cloudy overnight with a chance of rain mainly before midnight and a low near 54.

 

Eastern Plains:  

Torrington:  Chance of rain (some storms could be severe), otherwise partly sunny today with a high near 83 and mostly cloudy overnight with a chance of rain mainly before 9 p.m. (some storms could be severe) and a low near 58.

Wheatland:   Chance of rain (some storms could be severe), otherwise partly sunny today with a high near 83 and mostly cloudy overnight with a chance of rain before 9 p.m. (some storms could be severe) and a low near 58.

Guernsey:  Chance of rain (some storms could be severe), otherwise mostly sunny today with a high near 81 and mostly cloudy overnight with a slight chance of rain before 9 p.m. (some storms could be severe) and a low near 59.

 

Southeast:  

Cheyenne:   Chance of rain (some storms could be severe), otherwise mostly sunny today with a high near 78 and mostly cloudy overnight with a chance of rain before midnight (some storms could be severe) and a low near 56.

Laramie:  Chance of rain, otherwise partly sunny today with a high near 75 and mostly cloudy overnight with a chance of rain before midnight and a low near 51.

Pine Bluffs:  Chance of rain (some storms could be severe), otherwise mostly sunny today with a high near 82 and mostly cloudy overnight with a chance of rain (some storms could be severe) and a low near 56.

 

South Central:  

Rawlins:   Slight chance of rain, otherwise partly sunny today with a high near 74 and wind gusts as high as 25 mph. Mostly cloudy overnight with a low near 56.

Encampment:   Chance of rain, otherwise partly sunny today with a high near 75 and mostly cloudy overnight with a chance of rain before 9 p.m. and a low near 52.

Baggs:   Chance of rain, otherwise partly sunny today with a high near 80 and mostly cloudy overnight with a slight chance of rain before 9 p.m. and a low near 50.

Authors

CK

Coy Knobel

Night Editor