Local weather forecast

Weather in Florissant, MO

Updated 2026-08-11 10:30 local time · ZIP codes 63031, 63033, 63034

Sunny
Now87°F

Sunny

High / Low103° / 77°
Rain chance3%
Wind12 mph
Weather alerts

Active alerts

1
Heat Advisory issued August 11 at 2:17AM CDT until August 12 at 8:00PM CDT by NWS St Louis MO

* WHAT...Heat index values up to 106. * WHERE...Portions of south central, southwest, and west central Illinois and central, east central, northeast, and southeast Missouri. * WHEN...Until 8 PM CDT Wednesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Safety instructions

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1.

Hourly

Next hours

NowSunny87°4% rain
11 AMSunny97°2% rain
12 PMSunny100°1% rain
1 PMSunny102°1% rain
2 PMSunny103°1% rain
3 PMSunny103°1% rain
4 PMSunny103°1% rain
5 PMSunny102°1% rain
6 PMSunny100°1% rain
7 PMSunny97°1% rain
8 PMSunny93°1% rain
9 PMClear89°1% rain
Forecast

3-day weather forecast

Today2026-08-11
Sunny
103° 77°Sunny
Rain 3%Gust 13 mph
Tomorrow2026-08-12
Sunny
97° 83°Sunny
Rain 17%Gust 11 mph
Thursday2026-08-13
Sunny
103° 75°Sunny
Rain 17%Gust 13 mph
Conditions

Weather details

Feels like95°F
Humidity64%
Pressure29.95 inHg
Visibility6 mi
Wind12 mph WSW
Wind gusts14 mph
Precipitation0.00 in
UV index4
Daylight

Sunrise, sunset and moon

Sunrise06:11 AM
Sunset08:01 PM
Moonrise04:14 AM
Moon phaseNew Moon
Practical guide

Weather insights for today

Umbrella not essential

Rain chance stays relatively low over the next 12 hours (up to 2%).

Choose light, breathable clothing

It feels like 95°F with winds near 12 mph.

Best window: 8 PM

93°F, 1% rain chance and 6 mph wind.

Driving conditions look generally normal

Visibility is around 6 mi; gusts may reach 16 mph.

Running conditions are less comfortable

Current temperature is 87°F, wind 12 mph, rain chance up to 2%.

Moderate UV protection recommended

UV index is 4. Sunscreen and sunglasses are sensible for longer outdoor time.

Florissant weather today

Sunny and 87°F in Florissant, MO. Today's high is 103°F with a 3% rain chance. Winds are around 12 mph with gusts near 14 mph. Relative humidity is 64%, pressure is 29.95 inHg, and visibility is about 6 miles.

Tonight and tomorrow in Florissant

Sunrise is at 06:11 AM and sunset is at 08:01 PM. Tomorrow's forecast calls for Sunny with a high near 97°F and a low near 83°F. The maximum rain chance is 17%.

Nearby

Weather near Florissant

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