Casper, WY Weather Forecast
Natrona County, Wyoming
Seven-day outlook
33–65°F across the weekThe week runs between 34° and 64°, with tomorrow the warmest day of it. The second half leans cooling, and Monday is the coolest day in it. Monday is the wettest day, peaking near 78%. 4 of the 7 days stay dry.
Forecasts come from the National Weather Service's own computer models, and current conditions from the nearest reporting weather station. Both are served through the weather API. A forecast is guidance, not a warning, and anything the Weather Service has actually issued is on the live map.
The written summaries on this page are generated from the forecast data above, not by a meteorologist. Each sentence is a reading of the same numbers you can see, and no forecaster has reviewed them.
About the Casper forecast
Casper sits at 42.8421°N, 106.3213°W in Natrona County, Wyoming. The forecast above is drawn for that point from the National Weather Service's own computer models: a seven-day outlook, and a finer-grained one covering the next eighteen hours where it reaches, and the radar and alert panels show what the Weather Service has out over the area right now.
- County
- Natrona County
- Coordinates
- 42.8421°N, 106.3213°W
- Population
- 58,720 · 2023 estimate
- Land area
- 26.753 sq mi
Place data from the US Census Bureau. Coordinates are the Census internal point for Casper, and the forecast is for that location, not for every address inside the city limits, and a large city can have real weather differences from one side to the other.
How well can the network see Casper?
The nearest Doppler radar is KRIW (Riverton, WY), 110 miles to the W. A WSR-88D's lowest routine scan sits half a degree above horizontal, and the earth curves away beneath it, so by the time that beam reaches Casper its center is about 11,100 ft above ground. At that range the beam overshoots the layer where severe weather organizes. The radar is describing the middle of the storm, not its base , which is why a warning for Casper can look unsupported on the mosaic and still be right. Trust the warning over the picture.
The closest instrument actually measuring the air is KCPR · Casper/Natrona Cnty on the ASOS/AWOS network, 8.6 miles away. Near enough to be representative on most days, though a summer thunderstorm can soak one and miss the other entirely.
Beam height is the standard 4/3-earth approximation for the 0.5° scan and assumes normal refraction; it is where the center of the beam is, not its edges, and unusual temperature profiles bend it. Radar siting from the NWS WSR-88D network, station positions from the Wyoming observing network as of this build.
Forecasts near Casper
- Mills, WY4 mi
- Evansville, WY4 mi
- Bar Nunn, WY6 mi
- Glenrock, WY23 mi
- Douglas, WY47 mi
- Rawlins, WY86 mi
- Wheatland, WY88 mi
- Riverton, WY105 mi
Elsewhere in Wyoming
CheyenneGilletteLaramieRock SpringsSheridanEvanstonAll Wyoming forecasts →