Sinclair, WY Weather & Growing Conditions
Overnight
50°F
Mostly Cloudy
Mostly cloudy, with a low around 50. Southwest wind around 5 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 50°F | Mostly Cloudy | 5 mph SW | 11% |
| Saturday | 67°F | Mostly Sunny then Chance Showers And Thunderstorms | 5 to 15 mph SW | 32% |
| Saturday Night | 42°F | Mostly Cloudy | 5 to 15 mph WSW | 14% |
| Sunday | 62°F | Mostly Sunny | 10 mph W | 0% |
| Sunday Night | 39°F | Partly Cloudy | 0 to 10 mph NNE | 3% |
| Monday | 70°F | Sunny | 0 to 5 mph SSW | 0% |
| Monday Night | 41°F | Mostly Clear | 0 to 5 mph S | 0% |
| Tuesday | 74°F | Mostly Sunny | 0 to 10 mph SSW | 1% |
| Tuesday Night | 45°F | Chance Rain Showers | 5 to 10 mph SSW | 26% |
| Wednesday | 72°F | Mostly Sunny | 5 to 15 mph SW | 11% |
| Wednesday Night | 44°F | Partly Cloudy | 0 to 10 mph SSW | 6% |
| Thursday | 74°F | Mostly Sunny | 0 to 5 mph SSW | 4% |
| Thursday Night | 46°F | Partly Cloudy | 5 mph SE | 12% |
| Friday | 76°F | Mostly Sunny | 5 to 10 mph SSW | 10% |
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 Sep 19, 2026.