Newcastle, WY Weather Forecast
Local 7-day forecast
Mostly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Newcastle, WY in one place.
Mostly sunny. High near 47, with temperatures falling to around 45 in the afternoon. Northwest wind 20 to 32 mph, with gusts as high as 45 mph.
Local Weather Overview
This forecast page for Newcastle, WY is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Oct 15, 2026 12:02 PM MDT.
The active forecast window currently covers Oct 15 to Oct 21, 2026 for Newcastle, WY.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Oct 15 to Oct 21, 2026
- Latest sync
- Oct 15, 2026 12:02 PM MDT
- Forecast office
- UNR
- Source
- NOAA / NWS
Daily Outlook
This Week in Newcastle
Tuesday looks like the warmest upcoming period in Newcastle at 71 degrees F.
Tonight is the coolest period ahead with temperatures near 25 degrees F.
The strongest winds are forecast for Today at about 20 to 32 mph NW.
The forecast from Oct 15 through Oct 21 stays mostly dry.
Forecast Details
- Last updated
- Oct 15, 2026 12:02 PM MDT
- Coverage
- 8 days
- Time zone
- America/Denver
- Forecast office
- UNR
- Radar station
- KUDX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Widespread frost after 2am. Mostly clear. Low around 25, with temperatures rising to around 27 overnight. Wind chill values as low as 20. Northwest wind 5 to 25 mph, with gusts as high as 35 mph.
Widespread frost before 10am. Sunny. High near 51, with temperatures falling to around 49 in the afternoon. Southwest wind 1 to 7 mph, with gusts as high as 16 mph.
Clear. Low around 34, with temperatures rising to around 36 overnight. East wind 2 to 8 mph.
Sunny. High near 69, with temperatures falling to around 65 in the afternoon. Southeast wind around 3 mph.
Mostly clear, with a low around 43. East wind 1 to 6 mph.
Sunny, with a high near 68.
Mostly clear, with a low around 40.
Sunny, with a high near 67.
Clear, with a low around 46.
Sunny, with a high near 71.
Mostly clear, with a low around 47.
Mostly sunny, with a high near 66.
Partly cloudy, with a low around 45.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Today
Oct 15
|
Mostly Sunny
|
47°F |
20 to 32 mph
NW
|
|
Tonight
Oct 15
|
Mostly Clear then Widespread Frost
|
25°F |
5 to 25 mph
NW
|
|
Friday
Oct 16
|
Widespread Frost then Sunny
|
51°F |
1 to 7 mph
SW
|
|
Friday Night
Oct 16
|
Clear
|
34°F |
2 to 8 mph
E
|
|
Saturday
Oct 17
|
Sunny
|
69°F |
3 mph
SE
|
|
Saturday Night
Oct 17
|
Mostly Clear
|
43°F |
1 to 6 mph
E
|
|
Sunday
Oct 18
|
Sunny
|
68°F |
7 mph
N
|
|
Sunday Night
Oct 18
|
Mostly Clear
|
40°F |
6 mph
E
|
|
Monday
Oct 19
|
Sunny
|
67°F |
6 to 12 mph
SE
|
|
Monday Night
Oct 19
|
Clear
|
46°F |
3 to 10 mph
SE
|
|
Tuesday
Oct 20
|
Sunny
|
71°F |
1 to 5 mph
S
|
|
Tuesday Night
Oct 20
|
Mostly Clear
|
47°F |
3 mph
E
|
|
Wednesday
Oct 21
|
Mostly Sunny
|
66°F |
5 mph
NW
|
|
Wednesday Night
Oct 21
|
Partly Cloudy
|
45°F |
5 mph
E
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Newcastle.
