Newcastle, WY Weather Forecast & Alerts

Current conditions, 5-day forecast, and active NWS weather alerts for Newcastle, WY.

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Current Conditions — Newcastle, WY

NEWCASTLE MONDEL (KECS)

Clear

39.2 F
Humidity:45%
Wind Speed: 5.8 mph
Barometer: in
Dewpoint:19.4 F
Visibility:10.00 mi
Precip:--
Heat Index:NA
Wind Chill:34.9 F
Apr 23 2026, 06:35 AM MDT
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5-Day Forecast — Newcastle, WY

Thursday

High 51 °F
Snow Likely
Thursday
Night
Low 28 °F
Snow Likely
Friday

High 46 °F
Snow Likely
Friday
Night
Low 26 °F
Snow Likely
Saturday

High 48 °F
Forecast Missing
Saturday
Night
Low 32 °F
Forecast Missing
Sunday

High 44 °F
Forecast Missing
Sunday
Night
Low 28 °F
Forecast Missing
Monday

High 46 °F
Forecast Missing

Detailed Forecast — Newcastle, WY

Thursday
Snow Likely. High near 51°F. Wind 12 to 23 mph, with gusts as high as 35 mph.
Thursday Night
Snow Likely. Low around 28°F. Wind 6 to 10 mph, with gusts as high as 21 mph.
Friday
Snow Likely. High near 46°F. Wind 6 to 9 mph, with gusts as high as 16 mph.
Friday Night
Snow Likely. Low around 26°F. Wind 5 to 7 mph, with gusts as high as 13 mph.
Saturday
Forecast Missing. High near 48°F. Wind 6 to 8 mph, with gusts as high as 17 mph.
Saturday Night
Forecast Missing. Low around 32°F. Wind 5 to 8 mph, with gusts as high as 15 mph.
Sunday
Forecast Missing. High near 44°F. Wind around 5 mph, with gusts as high as 12 mph.
Sunday Night
Forecast Missing. Low around 28°F. Wind 5 to 6 mph, with gusts as high as 10 mph.
Monday
Forecast Missing. High near 46°F. Wind 6 to 7 mph, with gusts as high as 14 mph.
Monday Night
Forecast Missing. Low around 28°F. Wind 1 to 3 mph, with gusts as high as 8 mph.
Tuesday
Forecast Missing. High near 57°F. Wind 5 to 7 mph, with gusts as high as 15 mph.
Tuesday Night
Forecast Missing. Low around 33°F. Wind 2 to 3 mph, with gusts as high as 7 mph.
Wednesday
Forecast Missing. High near 57°F. Wind 6 to 8 mph, with gusts as high as 16 mph.
WY Radar
Current Radar • WY
Day 1 Outlook • April 23, 2026

Observation History — Newcastle, WY

Time Wind
(mph)		 Vis
(mi)		 Weather Precip (in) Temperature (F) Relative
Humidity		 Wind
Chill
(F)		 Heat
Index
(F)		 Pressure
Air Dwpt altimeter
(in)		 sea level
(mb)
06:35 AM MDT 5.8 10.00 Clear -- 39.2 19.4 45% 34.9 NA M
06:15 AM MDT 4.7 10.00 Mostly Cloudy -- 41.0 19.4 42% 37.9 NA M
05:55 AM MDT 0.0 10.00 Partly Cloudy -- 41.0 19.4 42% NA NA M
05:35 AM MDT 4.7 10.00 Clear -- 39.2 19.4 45% 35.8 NA M
05:15 AM MDT SE 4.7 10.00 Clear -- NULL 19.4 % NA NA M
04:55 AM MDT 8.1 10.00 Clear -- 41.0 17.6 38% 35.8 NA M
04:35 AM MDT 0.0 10.00 Clear -- 42.8 17.6 36% NA NA M
04:15 AM MDT SW 4.7 10.00 Clear -- 42.8 17.6 36% 39.9 NA M
03:55 AM MDT W 9.2 10.00 Clear -- 44.6 19.4 36% 39.7 NA M
03:35 AM MDT W 6.9 10.00 Clear -- 44.6 19.4 36% 40.6 NA M
02:55 AM MDT 0.0 10.00 Clear -- 46.4 19.4 34% NA NA M
02:35 AM MDT 4.7 10.00 Clear -- 44.6 19.4 36% 42.1 NA M
02:15 AM MDT SW 4.7 10.00 Clear -- 46.4 17.6 31% 44.2 NA M
01:55 AM MDT 10.3 10.00 Clear -- 46.4 17.6 31% 41.5 NA M
01:35 AM MDT W 6.9 10.00 Clear -- 46.4 15.8 29% 42.8 NA M
01:15 AM MDT W 6.9 10.00 Clear -- 50.0 14.0 23% NA NA M
12:55 AM MDT 6.9 10.00 Clear -- NULL 12.2 % NA NA M
12:35 AM MDT W 6.9 10.00 Clear -- 48.2 12.2 23% 45.1 NA M
12:15 AM MDT W 5.8 10.00 Clear -- NULL 12.2 % NA NA M
11:55 PM MDT W 8.1 10.00 Clear -- 51.8 12.2 20% NA NA M
11:35 PM MDT 8.1 10.00 Clear -- 51.8 12.2 20% NA NA M
11:15 PM MDT W 6.9 10.00 Clear -- 51.8 10.4 19% NA NA M
10:55 PM MDT W 9.2 10.00 Clear -- 53.6 10.4 17% NA NA M
10:35 PM MDT 12.8 G 19.7 10.00 Clear -- 55.4 10.4 16% NA NA M

Regional Weather Observation

NEWCASTLE MONDEL (KECS)

Clear
39.2 F

INYAN KARA (KIKA)

NULL
42.8 F

HULETT MUNI (KW43)

Cloudy
44.6 F

SPEARFISH/CLYDE (KSPF)

Partly Cloudy
50.0 F

CUSTER (KCUT)

Clear
37.4 F

BELLE FOURCHE (KBFU)

NULL
42.8 F
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