Sinclair, WY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sinclair, a town in Carbon County, Wyoming.
Today
81°F
Areas Of Smoke then Sunny
Areas of smoke before noon. Sunny. High near 81, with temperatures falling to around 79 in the afternoon. North wind 5 to 10 mph.
7-day forecast for Sinclair
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 81°F | Areas Of Smoke then Sunny | 5 to 10 mph N | 0% |
| Tonight | 49°F | Mostly Clear | 0 to 10 mph NW | 0% |
| Wednesday | 84°F | Sunny | 0 to 15 mph WSW | 0% |
| Wednesday Night | 52°F | Mostly Clear | 5 to 15 mph WSW | 0% |
| Thursday | 88°F | Sunny | 5 to 15 mph WSW | 0% |
| Thursday Night | 55°F | Mostly Clear | 0 to 15 mph WSW | 0% |
| Friday | 91°F | Sunny | 0 to 10 mph WSW | 0% |
| Friday Night | 59°F | Mostly Clear | 5 to 15 mph WSW | 0% |
| Saturday | 93°F | Sunny | 5 to 15 mph WSW | 0% |
| Saturday Night | 61°F | Mostly Clear | 0 to 15 mph WSW | 0% |
| Sunday | 92°F | Mostly Sunny | 0 to 15 mph WSW | 3% |
| Sunday Night | 61°F | Partly Cloudy | 5 to 15 mph SW | 4% |
| Monday | 92°F | Mostly Sunny | 5 to 15 mph WSW | 7% |
| Monday Night | 59°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 5 to 10 mph SW | 21% |
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 Aug 4, 2026.