Arnold, MO Weather Forecast & Alerts

Current conditions, 5-day forecast, and active NWS weather alerts for Arnold, MO.

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Current Conditions — Arnold, MO

ST LOUIS/SPIRIT (KSUS)

Clear

77.0 F
Humidity:41%
Wind Speed:E 8.1 mph
Barometer:29.85 in
Dewpoint:51.8 F
Visibility:10.00 mi
Precip:--
Heat Index:76.3 F
Wind Chill:NA
Apr 26 2026, 03:20 PM CDT
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5-Day Forecast — Arnold, MO

Sunday

High 80 °F
Partly Sunny
Sunday
Night
Low 62 °F
Chance of T-storms
Monday

High 84 °F
T-storms Likely
Monday
Night
Low 53 °F
T-storms Likely
Tuesday

High 75 °F
Chance of Scattered T-storms
Tuesday
Night
Low 50 °F
Mostly Cloudy
Wednesday

High 68 °F
Mostly Sunny
Wednesday
Night
Low 46 °F
Mostly Clear
Thursday

High 71 °F
Partly Sunny

Detailed Forecast — Arnold, MO

Sunday
Partly Sunny. High near 80°F. Wind 6 to 8 mph, with gusts as high as 16 mph.
Sunday Night
Chance of Thunderstorms. Low around 62°F. Wind 6 to 10 mph, with gusts as high as 21 mph.
Monday
Thunderstorms Likely. High near 84°F. Wind 12 to 16 mph, with gusts as high as 32 mph.
Monday Night
Thunderstorms Likely. Low around 53°F. Wind 6 to 13 mph, with gusts as high as 24 mph.
Tuesday
Chance of Scattered Thunderstorms. High near 75°F. Wind 3 to 5 mph, with gusts as high as 10 mph.
Tuesday Night
Mostly Cloudy. Low around 50°F. Wind around 6 mph, with gusts as high as 13 mph.
Wednesday
Mostly Sunny. High near 68°F. Wind 6 to 9 mph, with gusts as high as 17 mph.
Wednesday Night
Mostly Clear. Low around 46°F. Wind around 1 mph, with gusts as high as 5 mph.
Thursday
Partly Sunny. High near 71°F. Wind 3 to 5 mph, with gusts as high as 9 mph.
Thursday Night
Partly Cloudy. Low around 48°F. Wind around 2 mph, with gusts as high as 5 mph.
Friday
Mostly Cloudy. High near 68°F. Wind 5 to 8 mph, with gusts as high as 15 mph.
Friday Night
Partly Cloudy. Low around 44°F. Wind around 2 mph, with gusts as high as 5 mph.
Saturday
Partly Sunny. High near 68°F. Wind 3 to 7 mph, with gusts as high as 13 mph.
MO Radar
Current Radar • MO
Day 1 Outlook • April 26, 2026

Observation History — Arnold, MO

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)
03:20 PM CDT E 8.1 10.00 Clear -- 77.0 51.8 41% NA 76.3 29.85 1010.8
03:15 PM CDT 5.7 10.00 Clear -- 75.2 50.0 41% NA 74.3 29.86 1011.2
03:10 PM CDT E 11.5 10.00 Clear -- 75.2 50.0 41% NA 74.3 29.86 1011.2
03:05 PM CDT 9.2 10.00 Clear -- 77.0 51.8 41% NA 76.3 29.86 1011.2
02:50 PM CDT 10.4 10.00 Clear -- 78.8 51.8 39% NA 78.3 29.86 1011.2
02:45 PM CDT E 11.5 10.00 Clear -- 78.8 51.8 39% NA 78.3 29.86 1011.2
02:35 PM CDT 10.4 10.00 Clear -- 77.0 % NA NA 29.86 1011.2
02:25 PM CDT 12.7 10.00 Clear -- 78.8 51.8 39% NA 78.3 29.86 1011.2
02:20 PM CDT SE 11.5 10.00 Clear -- 78.8 51.8 39% NA 78.3 29.86 1011.2
02:10 PM CDT E 11.5 G 17.3 10.00 Clear -- 78.8 53.6 42% NA 78.3 29.87 1011.5
02:05 PM CDT E 11.5 G 17.3 10.00 Clear -- 78.8 53.6 42% NA 78.3 29.87 1011.5
01:50 PM CDT SE 8.1 10.00 Clear -- 78.8 51.8 39% NA 78.3 29.88 1011.9
01:45 PM CDT 10.4 10.00 Clear -- 78.8 51.8 39% NA 78.3 29.88 1011.9
01:40 PM CDT SE 9.2 10.00 Clear -- 78.8 51.8 39% NA 78.3 29.88 1011.9
01:35 PM CDT 11.5 10.00 Clear -- 78.8 53.6 42% NA 78.3 29.88 1011.9
01:30 PM CDT E 9.2 10.00 Clear -- 78.8 53.6 42% NA 78.3 29.89 1012.2
01:25 PM CDT E 9.2 10.00 Clear -- 77.0 53.6 44% NA 76.5 29.89 1012.2
01:15 PM CDT 4.6 10.00 Clear -- 77.0 53.6 44% NA 76.5 29.90 1012.5
01:10 PM CDT 10.4 10.00 Clear -- 77.0 53.6 44% NA 76.5 29.90 1012.5
01:05 PM CDT 12.7 10.00 Clear -- 77.0 53.6 44% NA 76.5 29.90 1012.5
12:50 PM CDT SE 10.4 G 16.1 10.00 Clear -- 77.0 53.6 44% NA 76.5 29.91 1012.9
12:45 PM CDT SE 10.4 10.00 Clear -- 75.2 53.6 47% NA 74.7 29.91 1012.9
12:40 PM CDT SE 9.2 10.00 Clear -- 75.2 53.6 47% NA 74.7 29.91 1012.9
12:35 PM CDT 8.1 10.00 Clear -- 75.2 53.6 47% NA 74.7 29.91 1012.9

Regional Weather Observation

ST LOUIS/SPIRIT (KSUS)

Clear
77.0 F

ST LOUIS (KSTL)

Clear
78.8 F

ST CHARLES (KSET)

Mostly Clear
78.8 F

CAHOKIA/ST LOUIS (KCPS)

Clear
80.6 F

ALTON/ST LOUIS R (KALN)

Mostly Cloudy
NULL F

WASHINGTON (KFYG)

Haze
NULL F
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