Extreme Heat Warning · until 5:30 PM CDT

Extreme Heat Warning

Severe · Clinton; Washington; Randolph; Madison; St. Clair; Monroe; Boone; Moniteau; Cole; Osage; Callaway; Montgomery; Gasconade; Warren; St. Charles; Franklin; St. Louis; St. Louis City; Jefferson

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

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. People in the Saint Louis Metropolitan Area can get information about cooling centers or energy assistance related to the excessive heat by calling the United Way of Greater Saint Louis at 800-427-4626, or if calling from a land line phone dial 2-1-1. You can also call Cool Down Saint Louis at 314-241-7668.

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Units

St. Louis, Missouri weather · now

90°

Clear

Feels: 98°
High / Low: 99° / 81°
Wind: 25 mph W
Humidity: 59%

No precipitation expected in the next 1.5 hours.

ModerateAir quality PollenTreeNoneGrassModerateWeedModerate

Sun 6:11 AM 8:00 PM 13h 49m

Moon Waning Crescent 3% lit

Current weather and 7-day forecast for St. Louis, Missouri, sourced directly from the National Weather Service. Expect mostly sunny today. Today's high is 99° with a low near 81°. 1 active weather alert in effect.

What to wear today

Stay cool — limit sun exposure

Extreme heat at 99°F. Light colors, hat, and shade breaks.

Next 24 hours

11 AM

90°

5%
1 PM

96°

3%
3 PM

99°

3%
5 PM

98°

3%
7 PM

96°

4%
9 PM

90°

9%
11 PM

88°

12%
1 AM

85°

11%
3 AM

84°

12%
5 AM

82°

12%
7 AM

81°

10%
9 AM

87°

20%

Live radar

View full radar →

Open full radar →

7 days

Today 8/11 Mostly Sunny 13% 99° · 81°
1. 11 AM 90° Sunny 5%
2. 12 PM 93° Mostly Sunny 5%
3. 1 PM 96° Partly Sunny 3%
4. 2 PM 98° Mostly Sunny 1%
5. 3 PM 99° Mostly Sunny 3%
6. 4 PM 99° Mostly Sunny 4%
7. 5 PM 98° Mostly Sunny 3%
8. 6 PM 95° Partly Cloudy 2%
9. 7 PM 96° Partly Cloudy 4%
10. 8 PM 93° Mostly Clear 5%
11. 9 PM 90° Mostly Clear 9%
12. 10 PM 89° Mostly Clear 13%
13. 11 PM 88° Partly Cloudy 12%
Wed 8/12 Scattered Showers And Thunderstorms 25% 98° · 78°
1. 12 AM 86° Partly Cloudy 12%
2. 1 AM 85° Partly Cloudy 11%
3. 2 AM 84° Partly Cloudy 12%
4. 3 AM 84° Mostly Clear 12%
5. 4 AM 83° Mostly Clear 12%
6. 5 AM 82° Mostly Clear 12%
7. 6 AM 82° Mostly Sunny 11%
8. 7 AM 81° Mostly Sunny 10%
9. 8 AM 84° Isolated Showers And Thunderstorms 15%
10. 9 AM 87° Isolated Showers And Thunderstorms 20%
11. 10 AM 89° Scattered Showers And Thunderstorms 25%
12. 11 AM 92° Isolated Showers And Thunderstorms 23%
13. 12 PM 94° Isolated Showers And Thunderstorms 21%
14. 1 PM 95° Isolated Showers And Thunderstorms 19%
15. 2 PM 97° Isolated Showers And Thunderstorms 19%
16. 3 PM 98° Isolated Showers And Thunderstorms 18%
17. 4 PM 98° Isolated Showers And Thunderstorms 18%
18. 5 PM 97° Isolated Showers And Thunderstorms 20%
19. 6 PM 96° Isolated Showers And Thunderstorms 21%
20. 7 PM 93° Isolated Showers And Thunderstorms 21%
21. 8 PM 89° Isolated Showers And Thunderstorms 20%
22. 9 PM 86° Isolated Showers And Thunderstorms 19%
23. 10 PM 84° Isolated Showers And Thunderstorms 19%
24. 11 PM 83° Isolated Showers And Thunderstorms 18%
Thu 8/13 Scattered Showers And Thunderstorms 36% 96° · 76°
1. 12 AM 82° Isolated Showers And Thunderstorms 17%
2. 1 AM 82° Isolated Showers And Thunderstorms 16%
3. 2 AM 81° Isolated Showers And Thunderstorms 17%
4. 3 AM 81° Isolated Showers And Thunderstorms 17%
5. 4 AM 80° Isolated Showers And Thunderstorms 17%
6. 5 AM 79° Isolated Showers And Thunderstorms 22%
7. 6 AM 79° Scattered Showers And Thunderstorms 27%
8. 7 AM 78° Slight Chance Showers And Thunderstorms 20%
9. 8 AM 80° Slight Chance Showers And Thunderstorms 20%
10. 9 AM 82° Slight Chance Showers And Thunderstorms 20%
11. 10 AM 85° Slight Chance Showers And Thunderstorms 20%
12. 11 AM 87° Slight Chance Showers And Thunderstorms 20%
13. 12 PM 90° Slight Chance Showers And Thunderstorms 20%
14. 1 PM 92° Slight Chance Showers And Thunderstorms 21%
15. 2 PM 94° Slight Chance Showers And Thunderstorms 21%
16. 3 PM 95° Slight Chance Showers And Thunderstorms 21%
17. 4 PM 95° Slight Chance Showers And Thunderstorms 21%
18. 5 PM 95° Slight Chance Showers And Thunderstorms 21%
19. 6 PM 93° Slight Chance Showers And Thunderstorms 21%
20. 7 PM 91° Slight Chance Showers And Thunderstorms 16%
21. 8 PM 89° Slight Chance Showers And Thunderstorms 16%
22. 9 PM 86° Slight Chance Showers And Thunderstorms 16%
23. 10 PM 83° Slight Chance Showers And Thunderstorms 16%
24. 11 PM 82° Slight Chance Showers And Thunderstorms 16%
Fri 8/14 Chance Showers And Thunderstorms then Partly Sunny 36% 94° · 76°
1. 12 AM 81° Slight Chance Showers And Thunderstorms 16%
2. 1 AM 80° Chance Showers And Thunderstorms 36%
3. 2 AM 79° Chance Showers And Thunderstorms 36%
4. 3 AM 78° Chance Showers And Thunderstorms 36%
5. 4 AM 78° Chance Showers And Thunderstorms 36%
6. 5 AM 77° Chance Showers And Thunderstorms 36%
7. 6 AM 76° Chance Showers And Thunderstorms 36%
8. 7 AM 76° Partly Sunny 11%
9. 8 AM 78° Partly Sunny 11%
10. 9 AM 80° Partly Sunny 11%
11. 10 AM 83° Partly Sunny 11%
12. 11 AM 85° Partly Sunny 11%
13. 12 PM 88° Partly Sunny 11%
14. 1 PM 90° Partly Sunny 3%
15. 2 PM 92° Partly Sunny 3%
16. 3 PM 93° Partly Sunny 3%
17. 4 PM 93° Mostly Sunny 3%
18. 5 PM 93° Mostly Sunny 3%
19. 6 PM 92° Partly Cloudy 3%
20. 7 PM 90° Partly Cloudy 3%
21. 8 PM 87° Partly Cloudy 3%
22. 9 PM 84° Partly Cloudy 3%
23. 10 PM 82° Partly Cloudy 3%
24. 11 PM 81° Partly Cloudy 3%
Sat 8/15 Mostly Sunny 8% 99° · 78°
1. 12 AM 80° Partly Cloudy 3%
2. 1 AM 80° Partly Cloudy 8%
3. 2 AM 79° Partly Cloudy 8%
4. 3 AM 79° Partly Cloudy 8%
5. 4 AM 78° Partly Cloudy 8%
6. 5 AM 77° Partly Cloudy 8%
7. 6 AM 76° Mostly Sunny 8%
8. 7 AM 76° Mostly Sunny 6%
9. 8 AM 78° Mostly Sunny 6%
10. 9 AM 82° Mostly Sunny 6%
11. 10 AM 86° Mostly Sunny 6%
12. 11 AM 89° Mostly Sunny 6%
13. 12 PM 93° Mostly Sunny 6%
14. 1 PM 95° Sunny
15. 2 PM 97° Sunny
16. 3 PM 98° Sunny
17. 4 PM 98° Sunny
18. 5 PM 97° Sunny
19. 6 PM 96° Mostly Clear
20. 7 PM 94° Mostly Clear 2%
21. 8 PM 91° Mostly Clear 2%
22. 9 PM 88° Mostly Clear 2%
23. 10 PM 86° Mostly Clear 2%
24. 11 PM 85° Mostly Clear 2%
Sun 8/16 Sunny 30% 98° · 75°
1. 12 AM 84° Mostly Clear 2%
2. 1 AM 83° Mostly Clear 7%
3. 2 AM 82° Mostly Clear 7%
4. 3 AM 81° Mostly Clear 7%
5. 4 AM 80° Mostly Clear 7%
6. 5 AM 79° Mostly Clear 7%
7. 6 AM 78° Sunny 7%
8. 7 AM 79° Sunny 2%
9. 8 AM 81° Sunny 2%
10. 9 AM 85° Sunny 2%
11. 10 AM 88° Sunny 2%
12. 11 AM 91° Sunny 2%
13. 12 PM 93° Sunny 2%
14. 1 PM 95° Sunny 3%
15. 2 PM 96° Sunny 3%
16. 3 PM 97° Sunny 3%
17. 4 PM 97° Sunny 3%
18. 5 PM 96° Sunny 3%
19. 6 PM 95° Mostly Clear 3%
20. 7 PM 93° Partly Cloudy 7%
21. 8 PM 90° Partly Cloudy 7%
22. 9 PM 86° Partly Cloudy 7%
23. 10 PM 83° Partly Cloudy 7%
24. 11 PM 82° Partly Cloudy 7%
Mon 8/17 Chance Showers And Thunderstorms 30% 88° · 71°
1. 12 AM 81° Partly Cloudy 7%
2. 1 AM 80° Chance Showers And Thunderstorms 30%
3. 2 AM 79° Chance Showers And Thunderstorms 30%
4. 3 AM 77° Chance Showers And Thunderstorms 30%
5. 4 AM 76° Chance Showers And Thunderstorms 30%
6. 5 AM 75° Chance Showers And Thunderstorms 30%
7. 6 AM 75° Chance Showers And Thunderstorms 30%
8. 7 AM 75° Slight Chance Showers And Thunderstorms 18%
9. 8 AM 76° Slight Chance Showers And Thunderstorms 18%
10. 9 AM 78° Slight Chance Showers And Thunderstorms 18%
11. 10 AM 80° Slight Chance Showers And Thunderstorms 18%
12. 11 AM 82° Slight Chance Showers And Thunderstorms 18%
13. 12 PM 84° Slight Chance Showers And Thunderstorms 18%
14. 1 PM 85° Mostly Sunny 12%
15. 2 PM 86° Mostly Sunny 12%
16. 3 PM 87° Mostly Sunny 12%
17. 4 PM 87° Mostly Sunny 12%
18. 5 PM 86° Mostly Sunny 12%
19. 6 PM 85° Partly Cloudy 12%
20. 7 PM 83° Partly Cloudy 6%
21. 8 PM 81° Partly Cloudy 6%
22. 9 PM 78° Partly Cloudy 6%
23. 10 PM 76° Partly Cloudy 6%

Extended outlook days 8–16

Tue 8/18 Drizzle 9% 92° · 68°
Wed 8/19 Drizzle 5% 98° · 72°
Thu 8/20 Mostly Sunny 8% 102° · 72°
Fri 8/21 Drizzle 10% 107° · 77°
Sat 8/22 Drizzle 23% 90° · 72°
Sun 8/23 Cloudy 13% 77° · 64°
Mon 8/24 Cloudy 13% 79° · 56°
Tue 8/25 Cloudy 17% 81° · 56°
Wed 8/26 Sunny 19% 89° · 59°

Days 8+ from the Open-Meteo multi-model ensemble — treat as a guide; accuracy drops past day 7.

Best day this week

Mild temps, low rain chance, clearer skies.

Saturday, 8/15

Mostly Sunny, 99° / 78°

Tomorrow98°78°
Thu96°76°
Fri94°76°
Sat99°78°
Sun98°75°
Mon88°71°

Best time to head outside

Picks the upcoming daytime hour with the most favorable conditions for each activity. Factors in temperature, wind, precipitation timing, and pollen.

RunTomorrow 6 AM
warm at 75°F · calm wind · 30% chance of rain · pollen moderate today
Good80 / 100
BikeTomorrow 7 AM
comfortable at 78°F · calm wind · slight chance of rain (20%) · pollen moderate today
Excellent100 / 100
GolfTomorrow 6 AM
comfortable at 82°F · calm wind · slight chance of rain (11%) · pollen moderate today
Excellent100 / 100
PicnicTomorrow 6 AM
comfortable at 82°F · calm wind · slight chance of rain (11%) · pollen moderate today
Excellent100 / 100
Magic ShowAnytime
Any weather is magic show weather. Indoors or out, magic doesn't care.
Corporate Magician Scott Henderson

How well did we do?

Average miss by lead time.

Each morning we save the day's predicted high/low. As later days arrive, we grade what we said against what the station actually recorded.

Same day

±7°

1 day graded

1 day out

±5°

1 day graded

3 days out

±5°

1 day graded

7 days out

±8°

2 days graded

Day-by-day, 1 day out5 days

Sun, Aug 9±5°
High94°92°+2°
Low76°71°+5°
Fri, Aug 7pending
High89°——
Low73°——
Thu, Aug 6pending
High85°——
Low72°——
Wed, Aug 5pending
High92°——
Low72°——
Tue, Aug 4pending
High89°——
Low68°——

Climate normals

What weather to expect in St. Louis

St. Louis in August typically averages 86° highs and 69° lows, with about 9 days of rain. The hottest stretch is July (average high 89°); the coldest is January (average low 21°). July is the wettest month on average.

Month	Avg high	Avg low	Rainy days
Jan	36°	21°	8
Feb	45°	28°	8
Mar	64°	42°	15
Apr	69°	52°	17
May	74°	57°	18
Jun	85°	68°	19
Jul	89°	72°	21
Aug	86°	69°	9
Sep	82°	63°	11
Oct	72°	52°	7
Nov	56°	42°	10
Dec	45°	30°	12

Normals derived from the past two years of observations via Open-Meteo's historical archive.

More for St. Louis

Other cities in Missouri

Detailed forecast (NWS)

Today: Mostly sunny, with a high near 99. Heat index values as high as 111. Southwest wind 3 to 9 mph.
Wednesday: Scattered showers and thunderstorms after 8am. Mostly sunny, with a high near 98. Heat index values as high as 111. Southwest wind around 7 mph. Chance of precipitation is 30%.
Thursday: Scattered showers and thunderstorms. Partly sunny, with a high near 96. South wind around 6 mph. Chance of precipitation is 30%.
Friday: A chance of showers and thunderstorms before 7am. Partly sunny, with a high near 94. Chance of precipitation is 40%.

Forecast details

NWS gridpoint: LSX 95,74
Radar station: KLSX
Time zone: America/Chicago
Coordinates: 38.627, -90.199