Thermopolis, WY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Thermopolis, a town in Hot Springs County, Wyoming.
Tonight
52°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms before 3am, then patchy fog. Mostly cloudy, with a low around 52. Southwest wind 1 to 7 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Thermopolis
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 52°F | Slight Chance Showers And Thunderstorms | 1 to 7 mph SW | 17% |
| Saturday | 69°F | Patchy Fog then Chance Showers And Thunderstorms | 1 to 12 mph NNW | 68% |
| Saturday Night | 46°F | Showers And Thunderstorms | 2 to 13 mph NNW | 84% |
| Sunday | 65°F | Chance Rain Showers | 1 to 7 mph NW | 50% |
| Sunday Night | 45°F | Partly Cloudy | 1 to 6 mph E | 9% |
| Monday | 73°F | Sunny | 1 to 5 mph SSE | 0% |
| Monday Night | 48°F | Mostly Clear | 3 mph SSE | 0% |
| Tuesday | 79°F | Mostly Sunny | 3 mph SSE | 0% |
| Tuesday Night | 51°F | Slight Chance Showers And Thunderstorms | 3 mph NW | 23% |
| Wednesday | 80°F | Sunny | 6 mph SSE | 4% |
| Wednesday Night | 51°F | Mostly Clear | 5 mph SE | 4% |
| Thursday | 82°F | Sunny | 3 to 7 mph SSW | 3% |
| Thursday Night | 52°F | Partly Cloudy | 6 mph SSE | 7% |
| Friday | 83°F | Mostly Sunny | 9 mph SSW | 5% |
Forecast source: National Weather Service (api.weather.gov) for Thermopolis (43.648, -108.215). Updated through the day.
Growing snapshot for Thermopolis
Last spring frost
May 24
First fall frost
Sep 16
Growing season
112 days
Hardiness zone
4b
More local growing data for Thermopolis: nearby ZIP 82430 weather · frost dates · planting calendar · Wyoming frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Thermopolis 9Ne, Wy (4 mi from Thermopolis). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.