Newcastle, UT Weather & Growing Conditions
This Afternoon
50°F
Sunny
Sunny, with a high near 50. South wind around 2 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 50°F | Sunny | 2 mph S | 0% |
| Tonight | 27°F | Mostly Clear | 3 mph S | 11% |
| Wednesday | 51°F | Sunny | 3 to 9 mph WNW | 11% |
| Wednesday Night | 25°F | Mostly Clear | 2 to 9 mph NE | 0% |
| Thursday | 51°F | Mostly Sunny | 3 mph NE | 0% |
| Thursday Night | 26°F | Mostly Clear | 2 to 6 mph NE | 0% |
| Friday | 52°F | Sunny | 6 to 14 mph NE | 0% |
| Friday Night | 26°F | Mostly Clear | 5 to 12 mph NE | 0% |
| Saturday | 56°F | Sunny | 5 to 8 mph NE | 0% |
| Saturday Night | 27°F | Mostly Clear | 0 to 5 mph ENE | 0% |
| Sunday | 61°F | Sunny | 1 mph SSW | 0% |
| Sunday Night | 30°F | Partly Cloudy | 1 mph NNE | 0% |
| Monday | 61°F | Mostly Sunny | 2 mph NE | 2% |
| Monday Night | 32°F | Partly Cloudy | 2 mph S | 2% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Newcastle, UT
Last spring frost
May 31
First fall frost
Sep 20
Growing season
110 days
Hardiness zone
5b
Explore more for Newcastle, UT: full frost dates · planting calendar · Utah frost dates
Climate data from the nearest NOAA station, Enterprise Beryl Jct, Ut (6.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.