O FALLON, MO 63366 Weather Forecast & Current Conditions
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  63366 WEATHER WARNINGS (SEVERE T-STORM & TORNADO)
 CURRENT WEATHER

SPIRIT OF ST. LOUIS, MO
Current Weather
9:54 PM CDT MAY 19, 2026
Overcast
64°F
Feels Like: 64°F
Dewpoint: 59°F
Rel. Hum.: 84%
Visibility: 10 miles
Wind: NNW at 9 mph
Pressure: 30.13 inches
Last 72 hours

Local Area Snow Depth

Missouri Current Weather

Missouri MOS Forecast Weather


Regional Weather Maps

(Automated weather data from NWS/FAA)
  63366 WEATHER FORECAST
10-Day model forecast maps
2025 Hurricanes

O FALLON, MO 63366
Weather Forecast

 Snowfall Forecast pages
Snow Depth pages
TONIGHT
Cloudy. A chance of showers and thunderstorms, mainly this evening. Lows in the mid 50s. North winds 5 to 10 mph. Chance of rain 50 percent.
WEDNESDAY
Cloudy. A slight chance of showers in the morning. Cooler with highs in the mid 60s. North winds 5 to 10 mph. Chance of rain 20 percent.
WEDNESDAY NIGHT
Mostly cloudy in the evening, then becoming partly cloudy. Lows in the lower 50s. Northeast winds 5 to 10 mph.
THURSDAY
Partly sunny. Highs in the lower 70s. Northeast winds 5 to 10 mph.
THURSDAY NIGHT
Mostly cloudy. A chance of showers in the evening, then showers likely with a slight chance of thunderstorms after midnight. Lows in the mid 50s. East winds 5 to 10 mph. Chance of rain 70 percent.
FRIDAY
A chance of thunderstorms. Showers. Highs in the lower 70s. Chance of rain 90 percent.
FRIDAY NIGHT AND SATURDAY
Mostly cloudy. A slight chance of showers and thunderstorms. Lows in the upper 50s. Highs around 80. Chance of rain 20 percent.
SATURDAY NIGHT
A slight chance of thunderstorms in the evening. Mostly cloudy with a chance of showers. Lows around 60. Chance of rain 50 percent.
SUNDAY
Mostly cloudy with a slight chance of showers in the morning, then partly sunny with a chance of showers and thunderstorms in the afternoon. Highs in the lower 80s. Chance of rain 40 percent.
SUNDAY NIGHT
Mostly cloudy with a chance of showers with a slight chance of thunderstorms. Lows in the lower 60s. Chance of rain 40 percent.
MEMORIAL DAY
Mostly cloudy in the morning, then becoming partly sunny. A chance of showers. A slight chance of thunderstorms in the morning, then a chance of thunderstorms in the afternoon. Highs in the lower 80s. Chance of rain 50 percent.
MONDAY NIGHT
Mostly cloudy with a chance of showers with a slight chance of thunderstorms. Lows in the mid 60s. Chance of rain 50 percent.
TUESDAY
Partly sunny. A slight chance of showers and thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 50 percent.

  63366 WEATHER SATELLITE LOOPS
Visible Weather Satellite
O FALLON, MO 63366
Infrared Weather Satellite
O FALLON, MO 63366
  63366 WEATHER RADAR LOOP
NEXRAD Weather Radar
O FALLON, MO 63366
 MOS COMPUTER WEATHER FORECAST

SPIRIT OF ST. LOUIS, MO 3 hourly weather forecast
weather forecast created  6:00 AM MDT  5/19/2026
Tuesday
19 MAY 2026		 O FALLON, MO 63366 weather forecast Day 1, 12 hours 1 PM 78° 80° Mostly Cloudy 52%
RAIN
***		 0% Thunder
( 66% severe)		 WSW   12 69% 67°
High 79° O FALLON, MO 63366 weather forecast Day 1, 15 hours 4 PM 76° 77° Mostly Cloudy WNW   9 76% 68°
Mostly Cloudy

Rain Likely

 O FALLON, MO 63366 weather forecast Day 1, 18 hours 7 PM 72° 72° Mostly Cloudy 48%
RAIN
.1–.25 in		 0% Thunder
( 42% severe)		 NNW   9 68% 61°
O FALLON, MO 63366 weather forecast Day 1, 21 hours 10 PM 65° 65° Mostly Cloudy N   8 84% 60°
Wednesday
20 MAY 2026		 O FALLON, MO 63366 weather forecast Day 2, 0 hours 1 AM 62° 62° Mostly Cloudy 30%
RAIN
.01–.1 in		 0% Thunder
( 21% severe)		 N   7 84% 57°
Low 54° O FALLON, MO 63366 weather forecast Day 2, 3 hours 4 AM 59° 57° Mostly Cloudy NA   9 80% 53°
High 68° O FALLON, MO 63366 weather forecast Day 2, 6 hours 7 AM 56° 54° Mostly Cloudy 7%

 0% Thunder
( 8% severe)		 N   9 80% 50°

Mostly Cloudy



 O FALLON, MO 63366 weather forecast Day 2, 9 hours 10 AM 60° 59° Mostly Cloudy NNE   9 64% 48°
O FALLON, MO 63366 weather forecast Day 2, 12 hours 1 PM 64° 64° Mostly Cloudy 3%

 0% Thunder
( 7% severe)		 NNE   8 60% 50°
O FALLON, MO 63366 weather forecast Day 2, 15 hours 4 PM 67° 67° Mostly Cloudy NNE   8 56% 51°
O FALLON, MO 63366 weather forecast Day 2, 18 hours 7 PM 68° 68° Mostly Cloudy 5%

 0% Thunder
( 4% severe)		 NE   7 53% 50°
O FALLON, MO 63366 weather forecast Day 2, 21 hours 10 PM 63° 64° Mostly Cloudy ENE   5 67% 52°
Thursday
21 MAY 2026		 O FALLON, MO 63366 weather forecast Day 3, 0 hours 1 AM 59° 58° Partly Cloudy 2%

 0% Thunder
( 3% severe)		 NE   6 72% 50°
Low 51° O FALLON, MO 63366 weather forecast Day 3, 3 hours 4 AM 55° 53° Partly Cloudy NE   7 72% 46°
High 72° O FALLON, MO 63366 weather forecast Day 3, 6 hours 7 AM 53° 51° Partly Cloudy 3%

 0% Thunder
( 4% severe)		 NE   7 74% 45°

Mostly Cloudy



 O FALLON, MO 63366 weather forecast Day 3, 9 hours 10 AM 60° 59° Mostly Cloudy ENE   7 67% 49°
O FALLON, MO 63366 weather forecast Day 3, 15 hours 1 PM 67° 67° Mostly Cloudy 12%
RAIN
<.01 in		 0% Thunder
( 7% severe)		 ENE   8 63% 54°
O FALLON, MO 63366 weather forecast Day 3, 18 hours 4 PM 70° 70° Mostly Cloudy E   9 61% 56°
O FALLON, MO 63366 weather forecast Day 3, 21 hours 7 PM 70° 70° Mostly Cloudy     ENE   8 59% 55°

SPIRIT OF ST. LOUIS, MO extended weather forecast
Friday
22 MAY 2026		 Saturday
23 MAY 2026		 Sunday
24 MAY 2026		 Monday
25 MAY 2026		 Tuesday
26 MAY 2026
Low 59° Low 59° Low 61° Low 61° Low 64°
High 69° High 77° High 79° High 79° High 78°
O FALLON, MO 63366 weather forecast Day 4 O FALLON, MO 63366 weather forecast Day 5 O FALLON, MO 63366 weather forecast Day 6 O FALLON, MO 63366 weather forecast Day 7 <!--SEARCHED_TOWN_NAME--> weather forecast Day 8
Overcast
66% Rain		 Overcast
58% Rain		 Overcast
62% Rain		 Overcast
49% Rain		 Overcast
53% Rain
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