Cities / United States / Missouri

29°

☀️ O'Fallon weather

Clear sky. .

Feels like 33° Wind 11 km/h S Humidity 74% Pressure 1011 hPa UV 7 Air Good ☀ 06:15 - 20:00
⚠ Extreme Heat Warning · Severe

Extreme Heat Warning issued August 13 at 3:34AM CDT until August 15 at 9:00PM CDT by NWS St Louis MO

Right now it is 29° in O'Fallon with clear skies, it feels more like 33° and today's high is 36° with an overnight low of 23°. The sun rises at 06:15 and sets at 20:00, giving 13h 45m of daylight. Over the coming week highs range from 31° to 40°.

O'Fallon is in Missouri, United States, sitting 165 m above sea level, with a population of about 85,000. Local time is America/Chicago (UTC−5), and every time on this page is shown in it.

Next 24 hours - temperature

25° 31° 36° 36° 25° 09:00 · 27.5° · 0 mm 10:00 · 29.4° · 0 mm 11:00 · 31.3° · 0 mm 12:00 · 32.9° · 0 mm 13:00 · 34.2° · 0 mm 14:00 · 35.1° · 0 mm 15:00 · 35.5° · 0 mm 16:00 · 35.5° · 0 mm 17:00 · 34.9° · 0 mm 18:00 · 33.7° · 0 mm 19:00 · 32.1° · 0 mm 20:00 · 30.1° · 0 mm 21:00 · 29° · 0 mm 22:00 · 28.3° · 0 mm 23:00 · 28.1° · 0 mm 00:00 · 27.7° · 0 mm 01:00 · 27.4° · 0 mm 02:00 · 27.1° · 0 mm 03:00 · 27° · 0 mm 04:00 · 27° · 0 mm 05:00 · 26.9° · 0 mm 06:00 · 25.5° · 19.4 mm 07:00 · 25° · 0 mm 08:00 · 27° · 0 mm

Precipitation

09:00 · 0 mm 09:00 10:00 · 0 mm 11:00 · 0 mm 12:00 · 0 mm 12:00 13:00 · 0 mm 14:00 · 0 mm 15:00 · 0 mm 15:00 16:00 · 0 mm 17:00 · 0 mm 18:00 · 0 mm 18:00 19:00 · 0 mm 20:00 · 0 mm 21:00 · 0 mm 21:00 22:00 · 0 mm 23:00 · 0 mm 00:00 · 0 mm 00:00 01:00 · 0 mm 02:00 · 0 mm 03:00 · 0 mm 03:00 04:00 · 0 mm 05:00 · 0 mm 06:00 · 19.4 mm 06:00 07:00 · 0 mm 08:00 · 0 mm

Hour by hour

TIMETEMPFEELSRAINCONDITIONS
09:00 ☀️ 27.5° 30.1° - Clear sky
10:00 ☀️ 29.4° 33.4° - Clear sky
11:00 ☁️ 31.3° 35.8° - Overcast
12:00 ☁️ 32.9° 37.6° - Overcast
13:00 ☁️ 34.2° 38.6° - Overcast
14:00 ⛅ 35.1° 38.4° - Partly cloudy
15:00 ⛅ 35.5° 38.5° - Partly cloudy
16:00 ☀️ 35.5° 37.8° - Clear sky
17:00 ☁️ 34.9° 36.8° - Overcast
18:00 ☁️ 33.7° 36.2° - Overcast
19:00 ⛅ 32.1° 34.8° - Partly cloudy
20:00 ☀️ 30.1° 31.7° - Clear sky

Next 16 days

Today☁️ 36°23° Fri 14🌧️ 37°25°19.4mm Sat 15☀️ 40°25° Sun 16🌧️ 37°23°9mm Mon 17🌦️ 31°21°1.4mm Tue 18🌦️ 35°20°2mm Wed 19🌦️ 40°21°1.3mm Thu 20⛅ 40°26° Fri 21☀️ 43°23° Sat 22🌦️ 25°18°5.4mm Sun 23☁️ 29°18° Mon 24☀️ 32°16° Tue 25☀️ 35°19° Wed 26☁️ 35°21° Thu 27🌦️ 27°17°1.2mm Fri 28☁️ 26°12°
☁️ TodayAugust 13th Avg 29° Low 23° at 00:00 High 36° at 15:00 Feels 38° Wind ~17 km/h
Clear Cloudy Clear
00:00 23°
02:00 23°
04:00 23°
06:00 23°
08:00 25°
10:00 29°
12:00 33°
14:00 35°
16:00 36°
18:00 34°
20:00 30°
22:00 28°
🌧️ FridayAugust 14th Avg 30° Low 25° at 07:00 High 37° at 16:00 19.4 mm rain Feels 39° Wind ~21 km/h
Clear Clear
00:00 28°
02:00 27°
04:00 27°
06:00 26° 19.4mm
08:00 27°
10:00 30°
12:00 33°
14:00 36°
16:00 37°
18:00 35°
20:00 32°
22:00 28°
☀️ SaturdayAugust 15th Avg 31° Low 25° at 04:00 High 40° at 15:00 Feels 37° Wind ~24 km/h
Cloudy Partly Cloudy Clear Cloudy
00:00 27°
02:00 26°
04:00 25°
06:00 25°
08:00 27°
10:00 34°
12:00 38°
14:00 40°
16:00 40°
18:00 38°
20:00 31°
22:00 28°
🌧️ SundayAugust 16th Avg 29° Low 23° at 23:00 High 37° at 16:00 9 mm rain Feels 39° Wind ~29 km/h
Clear Rain
00:00 26°
02:00 26°
04:00 26°
06:00 25°
08:00 28°
10:00 31°
12:00 34°
14:00 36°
16:00 37°
18:00 33°
20:00 26° 1.9mm
22:00 23° 3.9mm
🌦️ MondayAugust 17th Avg 25° Low 21° at 06:00 High 31° at 15:00 1.4 mm rain Wind ~17 km/h
Clear Partly Cloudy Cloudy
00:00 23° 0.5mm
02:00 22°
04:00 21° 0.5mm
06:00 21°
08:00 22°
10:00 25°
12:00 29°
14:00 31°
16:00 31°
18:00 30°
20:00 25°
22:00 24°
🌦️ TuesdayAugust 18th Avg 26° Low 20° at 05:00 High 35° at 15:00 2 mm rain Wind ~18 km/h
Clear Rain
00:00 22°
02:00 21°
04:00 20°
06:00 20°
08:00 23°
10:00 28°
12:00 32°
14:00 34°
16:00 35°
18:00 32° 0.1mm
20:00 26° 0.4mm
22:00 21° 0.4mm
🌦️ WednesdayAugust 19th Avg 27° Low 21° at 00:00 High 40° at 16:00 1.3 mm rain Feels 38° Wind ~29 km/h
Cloudy Partly Cloudy Partly Cloudy Rain
00:00 21° 0.5mm
02:00 22°
04:00 22°
06:00 21°
08:00 21°
10:00 23°
12:00 28°
14:00 35°
16:00 40°
18:00 34°
20:00 29° 0.1mm
22:00 27° 0.1mm
⛅ ThursdayAugust 20th Avg 32° Low 26° at 23:00 High 40° at 15:00 Wind ~27 km/h
Cloudy Partly Cloudy
00:00 27°
02:00 27°
04:00 28°
06:00 29°
08:00 32°
10:00 35°
12:00 38°
14:00 39°
16:00 39°
18:00 34°
20:00 29°
22:00 27°
☀️ FridayAugust 21st Avg 32° Low 23° at 06:00 High 43° at 15:00 Feels 38° Wind ~26 km/h
Clear Cloudy Clear
00:00 25°
02:00 24°
04:00 24°
06:00 23°
08:00 27°
10:00 34°
12:00 39°
14:00 42°
16:00 43°
18:00 39°
20:00 35°
22:00 31°
🌦️ SaturdayAugust 22nd Avg 21° Low 18° at 05:00 High 25° at 00:00 5.4 mm rain Wind ~21 km/h
Rain Cloudy
00:00 25°
02:00 20° 0.7mm
04:00 18° 0.7mm
06:00 18° 0.7mm
08:00 19° 0.4mm
10:00 19° 0.4mm
12:00 20°
14:00 22°
16:00 24°
18:00 23°
20:00 22°
22:00 22°
☁️ SundayAugust 23rd Avg 23° Low 18° at 23:00 High 29° at 16:00 Wind ~17 km/h
Cloudy Clear
00:00 21°
02:00 21°
04:00 20°
06:00 20°
08:00 20°
10:00 22°
12:00 24°
14:00 27°
16:00 29°
18:00 27°
20:00 23°
22:00 19°
☀️ MondayAugust 24th Avg 23° Low 16° at 06:00 High 32° at 15:00 Feels 30° Wind ~14 km/h
Clear
00:00 18°
02:00 17°
04:00 16°
06:00 16°
08:00 19°
10:00 25°
12:00 29°
14:00 31°
16:00 32°
18:00 29°
20:00 25°
22:00 22°
☀️ TuesdayAugust 25th Avg 26° Low 19° at 06:00 High 35° at 16:00 Feels 33° Wind ~14 km/h
Clear Clear Partly Cloudy
00:00 22°
02:00 21°
04:00 20°
06:00 19°
08:00 21°
10:00 27°
12:00 32°
14:00 34°
16:00 35°
18:00 33°
20:00 29°
22:00 25°
☁️ WednesdayAugust 26th Avg 27° Low 21° at 06:00 High 35° at 15:00 Wind ~21 km/h
Clear Partly Cloudy Cloudy Partly Cloudy Clear
00:00 24°
02:00 23°
04:00 22°
06:00 21°
08:00 23°
10:00 29°
12:00 33°
14:00 35°
16:00 35°
18:00 32°
20:00 28°
22:00 24°
🌦️ ThursdayAugust 27th Avg 21° Low 17° at 23:00 High 27° at 14:00 1.2 mm rain Feels 23° Wind ~25 km/h
Clear Rain Cloudy Partly Cloudy
00:00 21°
02:00 19°
04:00 17°
06:00 17° 0.3mm
08:00 18° 0.1mm
10:00 22° 0.1mm
12:00 26°
14:00 27°
16:00 26°
18:00 25°
20:00 22°
22:00 18°
☁️ FridayAugust 28th Avg 19° Low 12° at 06:00 High 26° at 14:00 Feels 21° Wind ~19 km/h
Cloudy Clear Cloudy
00:00 16°
02:00 15°
04:00 14°
06:00 12°
08:00 15°
10:00 20°
12:00 24°
14:00 26°
16:00 25°
18:00 23°
20:00 21°
22:00 20°

Sun

☀️ Sunrise 06:15 · Sunset 20:00

13h 45m of daylight · America/Chicago

Air quality

PM2.5 7.1 µg/m³ - Good

No reason to change your plans - open the windows.

Source: Copernicus CAMS, updated hourly.

Nearby

Dardenne Prairie · 5.2 km Saint Peters · 6.5 km All Saints Village · 6.5 km Saint Paul · 6.7 km Dardenne · 7 km Lake Saint Louis · 7.6 km

Tools for O'Fallon

☔ Will it rain today? 🌅 Sunrise & sunset 🫁 Air quality 📼 Weather on this day

Common questions about O'Fallon weather

Will it rain in O'Fallon today?

No rain is in the forecast for O'Fallon today.

What is the temperature in O'Fallon right now?

It is 29° in O'Fallon right now, though it feels closer to 33°. Today runs between a low of 23° and a high of 36°.

What time is sunrise and sunset in O'Fallon?

The sun rises at 06:15 and sets at 20:00 local time in O'Fallon today, giving 13h 45m of daylight.

What is the air quality in O'Fallon?

PM2.5 in O'Fallon is currently 7.1 µg/m³, which counts as Good on the European air-quality index. No reason to change your plans - open the windows.

How accurate is the O'Fallon forecast, and how far ahead does it go?

This page shows 16 days ahead, refreshed every hour. It blends ECMWF, NOAA GFS and whichever national high-resolution model covers O'Fallon best. The first three days are the dependable part - day one is usually within a degree or two - and accuracy falls off steadily after day five, so read the far end as a trend rather than a plan. We publish our measured error against real station observations on the accuracy page.

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