🇺🇸 Weather in O'Fallon
Map Overlays:
Hourly Forecast for O'Fallon
20:00
23°
0%
21:00
22°
0%
22:00
20°
1%
23:00
19°
1%
00:00
18°
1%
01:00
17°
1%
02:00
16°
1%
03:00
15°
1%
04:00
14°
2%
05:00
14°
2%
06:00
14°
2%
07:00
16°
2%
08:00
18°
2%
09:00
19°
2%
10:00
21°
1%
11:00
23°
0%
12:00
24°
0%
13:00
25°
0%
14:00
26°
0%
15:00
26°
0%
16:00
26°
0%
17:00
26°
0%
18:00
25°
1%
19:00
23°
1%
14-Day Forecast for O'Fallon
Tue, Jun 02
Sunny
30° /
17°
Wed, Jun 03
Sunny
27° /
13°
Thu, Jun 04
Sunny
31° /
16°
Fri, Jun 05
Patchy rain nearby
29° /
18°
Sat, Jun 06
Moderate rain
30° /
18°
Sun, Jun 07
Patchy rain nearby
30° /
21°
Mon, Jun 08
Patchy rain nearby
25° /
22°
Tue, Jun 09
Patchy rain nearby
25° /
19°
Wed, Jun 10
Sunny
28° /
17°
Thu, Jun 11
Sunny
29° /
18°
Fri, Jun 12
Sunny
30° /
18°
Sat, Jun 13
Sunny
32° /
21°
Sun, Jun 14
Patchy rain nearby
33° /
22°
Mon, Jun 15
Patchy rain nearby
33° /
23°
Additional Forecasts for O'Fallon
Air Quality
💨 US EPA Index 1 (Good)
CO (Carbon Monoxide) 151.0 μg/m³
O₃ (Ozone) 107.0 μg/m³
NO₂ (Nitrogen Dioxide) 4.4 μg/m³
SO₂ (Sulphur Dioxide) 1.7 μg/m³
PM2.5 (Fine particles) 6.9 μg/m³
PM10 (Coarse particles) 7.2 μg/m³
Historical Weather
Weather Forecasts for Other Cities in United States
Frequently Asked Questions about Weather in O'Fallon
What is the temperature in O'Fallon right now?
The current temperature in O'Fallon is 25°C (78°F), sunny (feels like 18°C).
What's the weather like in O'Fallon right now?
Conditions in O'Fallon right now: Sunny, humidity 33%, wind 15 km/h E.
What is today's forecast for O'Fallon?
Today in O'Fallon: high 30°C, low 17°C, sunny. Chance of rain: 1%.
What is the 7-day weather forecast for O'Fallon?
Daily highs and lows for O'Fallon:
- 2026-06-02: 30°C / 17°C
- 2026-06-03: 27°C / 13°C
- 2026-06-04: 31°C / 16°C
- 2026-06-05: 29°C / 18°C
- 2026-06-06: 30°C / 18°C
- 2026-06-07: 30°C / 21°C
- 2026-06-08: 25°C / 22°C
Is it going to rain in O'Fallon today?
There is a 1% chance of rain in O'Fallon today.
What is the wind speed in O'Fallon right now?
Wind in O'Fallon is currently 15 km/h (9 mph) from the E.
What is the UV index in O'Fallon right now?
The UV index in O'Fallon is currently 0.4 (low). Sun protection is recommended when the index is 3 or higher.
