Thermopolis, WY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Thermopolis, a town in Hot Springs County, Wyoming.
Tonight
30°F
Mostly Clear
Mostly clear. Low around 30, with temperatures rising to around 35 overnight. South wind around 5 mph.
7-day forecast for Thermopolis
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 30°F | Mostly Clear | 5 mph S | 0% |
| Wednesday | 53°F | Partly Sunny | 3 mph NNE | 0% |
| Wednesday Night | 31°F | Partly Cloudy | 1 to 7 mph SSW | 0% |
| Thursday | 56°F | Sunny | 3 to 10 mph S | 0% |
| Thursday Night | 32°F | Partly Cloudy | 1 to 5 mph SW | 1% |
| Friday | 54°F | Sunny | 1 to 5 mph S | 1% |
| Friday Night | 31°F | Mostly Clear | 5 mph S | 3% |
| Saturday | 58°F | Sunny | 5 mph S | 0% |
| Saturday Night | 33°F | Mostly Clear | 5 to 12 mph S | 0% |
| Sunday | 63°F | Sunny | 9 to 13 mph S | 0% |
| Sunday Night | 37°F | Partly Cloudy | 6 to 9 mph SSW | 0% |
| Monday | 61°F | Mostly Sunny | 7 mph S | 0% |
| Monday Night | 37°F | Partly Cloudy | 5 to 8 mph S | 0% |
| Tuesday | 63°F | Mostly Sunny | 6 mph SE | 2% |
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 Nov 4, 2026.