Newcastle, UT Weather & Growing Conditions
Overnight
43°F
Mostly Clear
Mostly clear. Low around 43, with temperatures rising to around 46 overnight. East southeast wind around 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 43°F | Mostly Clear | 7 mph ESE | 4% |
| Saturday | 81°F | Sunny | 6 mph NE | 1% |
| Saturday Night | 41°F | Mostly Clear | 6 mph NE | 0% |
| Sunday | 81°F | Sunny | 3 to 8 mph NNE | 0% |
| Sunday Night | 42°F | Partly Cloudy | 3 mph ESE | 0% |
| Monday | 81°F | Mostly Sunny | 2 to 6 mph ENE | 2% |
| Monday Night | 43°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 2 to 7 mph S | 58% |
| Tuesday | 77°F | Chance Rain Showers | 2 to 6 mph ESE | 53% |
| Tuesday Night | 39°F | Mostly Clear | 0 to 5 mph E | 8% |
| Wednesday | 81°F | Sunny | 0 to 5 mph NE | 9% |
| Wednesday Night | 42°F | Mostly Clear | 0 to 5 mph SE | 2% |
| Thursday | 83°F | Sunny | 0 to 5 mph ENE | 5% |
| Thursday Night | 44°F | Partly Cloudy | 1 to 6 mph S | 6% |
| Friday | 82°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 0 to 7 mph ESE | 18% |
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 Sep 19, 2026.