Newcastle, UT Weather & Growing Conditions
Today
97°F
Patchy Smoke then Sunny
Patchy smoke before noon. Sunny, with a high near 97. East wind 2 to 13 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 97°F | Patchy Smoke then Sunny | 2 to 13 mph E | 0% |
| Tonight | 59°F | Mostly Clear | 3 to 14 mph S | 0% |
| Wednesday | 97°F | Sunny | 2 to 10 mph SW | 0% |
| Wednesday Night | 60°F | Clear | 3 to 12 mph SSW | 0% |
| Thursday | 98°F | Sunny | 2 to 6 mph SW | 2% |
| Thursday Night | 61°F | Mostly Clear | 5 to 8 mph SSW | 1% |
| Friday | 98°F | Sunny | 3 mph SW | 2% |
| Friday Night | 61°F | Partly Cloudy | 7 mph SW | 1% |
| Saturday | 98°F | Sunny then Slight Chance Showers And Thunderstorms | 2 to 7 mph SSW | 11% |
| Saturday Night | 62°F | Partly Cloudy | 8 mph SSW | 8% |
| Sunday | 95°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 13 mph SSW | 15% |
| Sunday Night | 60°F | Partly Cloudy | 7 to 13 mph SSW | 8% |
| Monday | 92°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 6 to 15 mph SSW | 15% |
| Monday Night | 57°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 7 to 14 mph SSW | 11% |
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 Aug 4, 2026.