Sinclair, WY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sinclair, a town in Carbon County, Wyoming.
Tonight
50°F
Mostly Cloudy then Slight Chance Rain Showers
A slight chance of rain showers between midnight and 3am. Mostly cloudy, with a low around 50. Southwest wind 5 to 15 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Sinclair
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 50°F | Mostly Cloudy then Slight Chance Rain Showers | 5 to 15 mph SW | 16% |
| Saturday | 67°F | Partly Sunny then Chance Showers And Thunderstorms | 5 to 15 mph SW | 39% |
| Saturday Night | 42°F | Mostly Cloudy | 5 to 15 mph WSW | 9% |
| Sunday | 63°F | Mostly Sunny | 10 mph W | 0% |
| Sunday Night | 39°F | Partly Cloudy | 0 to 10 mph SSW | 2% |
| Monday | 70°F | Sunny | 0 to 10 mph SW | 0% |
| Monday Night | 41°F | Mostly Clear | 0 to 5 mph S | 0% |
| Tuesday | 74°F | Mostly Sunny | 0 to 10 mph SW | 1% |
| Tuesday Night | 45°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph SSW | 23% |
| Wednesday | 72°F | Mostly Sunny | 5 to 15 mph SW | 12% |
| Wednesday Night | 44°F | Partly Cloudy | 0 to 10 mph SSW | 6% |
| Thursday | 74°F | Mostly Sunny | 0 to 5 mph SW | 4% |
| Thursday Night | 46°F | Partly Cloudy | 0 to 5 mph SSE | 11% |
| Friday | 76°F | Mostly Sunny | 0 to 10 mph SSW | 10% |
Forecast source: National Weather Service (api.weather.gov) for Sinclair (41.776, -107.120). Updated through the day.
Growing snapshot for Sinclair
Last spring frost
May 12
First fall frost
Oct 4
Growing season
143 days
Hardiness zone
5a
More local growing data for Sinclair: nearby ZIP 82334 weather · frost dates · planting calendar · Wyoming frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Seminoe Rsvrbr, Wy (14.3 mi from Sinclair). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.