National Weather Service Forecast for: Arnold MO
Issued by: National Weather Service Saint Louis, MO
Updated: 1:21 pm CDT Jul 4, 2025
 
Independence
Day
Independence Day: Mostly sunny, with a high near 94. South wind around 7 mph.
Mostly Sunny

 Tonight

Tonight: Mostly clear, with a low around 70. South wind around 6 mph becoming calm in the evening.
Mostly Clear

 Saturday

Saturday: Sunny, with a high near 95. Calm wind becoming south 5 to 7 mph in the morning.
Sunny

 Saturday
Night
Saturday Night: A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 74. Southwest wind 3 to 6 mph.
Partly Cloudy
then Slight
Chance
T-storms
 Sunday

Sunday: A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 91. West wind 3 to 7 mph.
Chance
T-storms

 Sunday
Night
Sunday Night: A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72.
Chance
T-storms

 Monday

Monday: A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 91.
Chance
T-storms

 Monday
Night
Monday Night: Mostly clear, with a low around 71.
Mostly Clear

 Tuesday

Tuesday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 92.
Sunny then
Chance
T-storms
Hi 94 °F Lo 70 °F Hi 95 °F Lo 74 °F Hi 91 °F Lo 72 °F Hi 91 °F Lo 71 °F Hi 92 °F

 

Independence Day
 
 Mostly sunny, with a high near 94. South wind around 7 mph.
Tonight
 
 Mostly clear, with a low around 70. South wind around 6 mph becoming calm in the evening.
Saturday
 
 Sunny, with a high near 95. Calm wind becoming south 5 to 7 mph in the morning.
Saturday Night
 
 A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 74. Southwest wind 3 to 6 mph.
Sunday
 
 A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 91. West wind 3 to 7 mph.
Sunday Night
 
 A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72.
Monday
 
 A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 91.
Monday Night
 
 Mostly clear, with a low around 71.
Tuesday
 
 A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 92.
Tuesday Night
 
 A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 71.
Wednesday
 
 A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 90.
Wednesday Night
 
 A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 71.
Thursday
 
 A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90.

 

Forecast from NOAA-NWS for Arnold MO.