Sinclair, WY Weather & Growing Conditions
Today
48°F
Cloudy
Cloudy. High near 48, with temperatures falling to around 45 in the afternoon. Northeast wind 5 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 48°F | Cloudy | 5 to 10 mph NE | 2% |
| Tonight | 22°F | Mostly Cloudy | 5 mph ENE | 1% |
| Thursday | 50°F | Sunny | 5 mph SW | 0% |
| Thursday Night | 27°F | Mostly Cloudy | 5 mph SW | 3% |
| Friday | 49°F | Sunny | 5 to 15 mph WSW | 8% |
| Friday Night | 26°F | Mostly Clear | 10 mph SW | 1% |
| Saturday | 52°F | Sunny | 5 to 15 mph WSW | 0% |
| Saturday Night | 27°F | Mostly Clear | 5 mph SSW | 0% |
| Sunday | 58°F | Sunny | 10 to 20 mph SW | 0% |
| Sunday Night | 32°F | Mostly Clear | 10 to 15 mph SW | 0% |
| Monday | 59°F | Mostly Sunny | 10 to 15 mph SW | 0% |
| Monday Night | 32°F | Partly Cloudy | 5 mph SSW | 0% |
| Tuesday | 57°F | Mostly Sunny | 5 to 15 mph SW | 0% |
| Tuesday Night | 32°F | Partly Cloudy | 5 to 10 mph SW | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Sinclair, WY
Last spring frost
Jun 12
First fall frost
Sep 7
Growing season
83 days
Hardiness zone
5a
Explore more for Sinclair, WY: full frost dates · planting calendar · Wyoming frost dates
Climate data from the nearest NOAA station, Saratoga 4N, Wy (17.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.