Sinclair, WY Weather & Growing Conditions
This Afternoon
45°F
Sunny
Sunny. High near 45, with temperatures falling to around 39 in the afternoon. West southwest wind 5 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 45°F | Sunny | 5 to 10 mph WSW | 1% |
| Tonight | 27°F | Partly Cloudy | 0 to 5 mph S | 0% |
| Wednesday | 47°F | Mostly Cloudy | 0 to 5 mph NE | 1% |
| Wednesday Night | 24°F | Mostly Cloudy | 0 to 5 mph W | 0% |
| Thursday | 50°F | Sunny | 0 to 10 mph SW | 0% |
| Thursday Night | 27°F | Partly Cloudy | 5 mph SW | 0% |
| Friday | 49°F | Sunny | 5 to 15 mph WSW | 1% |
| Friday Night | 26°F | Mostly Clear | 5 to 10 mph SW | 2% |
| Saturday | 51°F | Sunny | 5 to 15 mph SW | 2% |
| Saturday Night | 27°F | Mostly Clear | 5 mph SW | 0% |
| Sunday | 57°F | Sunny | 5 to 20 mph SW | 0% |
| Sunday Night | 33°F | Mostly Clear | 10 to 15 mph SW | 0% |
| Monday | 58°F | Mostly Sunny | 5 to 15 mph SW | 0% |
| Monday Night | 33°F | Partly Cloudy | 5 to 10 mph SW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Sinclair, WY
Last spring frost
May 12
First fall frost
Oct 4
Growing season
143 days
Hardiness zone
5a
Explore more for Sinclair, WY: full frost dates · planting calendar · Wyoming frost dates
Climate data from the nearest NOAA station, Seminoe Rsvrbr, Wy (14.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.