5-day weather forecast St. Louis Sep 8, 2026
19°Weather forecast St. Louis today Sep 8, 2026: overcast, temperature from 19 °C to 36 °C.
Precipitation probability 12%. Wind up to 3.5 m/s (gusts 9.33 m/s). Air humidity 21–58%, atmospheric pressure 761–764 mm Hg, UV index up to 7.6.
Weather Alerts
Air Quality Alert issued September 7 at 5:53PM CDT by NWS St Louis MO
Air Quality Alert
The St. Louis Clean Air Partnership has issued an air quality alert
for the St. Louis metropolitan area from 10 AM to 8 PM CDT Tuesday.
An Orange air quality forecast means that maximum ozone
concentrations are expected to reach levels that pose a health risk.
Adverse health effects increase as air quality deteriorates. Ground-
level ozone is an air contaminant which can cause breathing
difficulties for children, older adults, as well as persons with
respiratory problems.
Reducing outdoor physical activity is recommended. If it is a
regularly scheduled work day you are urged to consider
telecommuting, carpooling, or utilizing public transit. Avoid
excessive idling and do not top off when refueling motor vehicles.
The use of gasoline-powered lawn equipment should be reduced or
postponed until late in the day.
For more information visit the St. Louis Clean Air Partnership at
http://cleanair-stlouis.com/
For current Air Quality Index (AQI) values visit
https://www.airnow.gov/
Air Quality Alert issued September 7 at 3:40PM CDT by NWS St Louis MO
Air Quality Alert
The St. Louis Clean Air Partnership has issued an air quality alert
for the St. Louis metropolitan area from 10 AM to 8 PM CDT Tuesday.
An Orange air quality forecast means that maximum ozone
concentrations are expected to reach levels that pose a health risk.
Adverse health effects increase as air quality deteriorates. Ground-
level ozone is an air contaminant which can cause breathing
difficulties for children, older adults, as well as persons with
respiratory problems.
Reducing outdoor physical activity is recommended. If it is a
regularly scheduled work day you are urged to consider
telecommuting, carpooling, or utilizing public transit. Avoid
excessive idling and do not top off when refueling motor vehicles.
The use of gasoline-powered lawn equipment should be reduced or
postponed until late in the day.
For more information visit the St. Louis Clean Air Partnership at
http://cleanair-stlouis.com/
For current Air Quality Index (AQI) values visit
https://www.airnow.gov/
5 days at a glance — tap a day to open it
Sunrise 06:36
Sunset 19:20
Sunset 19:20
Waning Crescent6% illuminated
Moonrise 03:08 · Moonset 17:54
Moonrise 03:08 · Moonset 17:54
Chart
Table
Tue, Sep 8, 2026
| Time | Weather | Temperature | Rain chance | Cloud cover | Humidity | Pressure | Wind | UV Index |
|---|---|---|---|---|---|---|---|---|
| 00:00 | Clear | 22 °C | 2% | 0% | 49% | 763 mm Hg | ESE 105° 3.5 (9.33) m/s | 0 |
| 01:00 | Clear | 21 °C | 2% | 0% | 51% | 763 mm Hg | ESE 122° 3.11 (7.61) m/s | 0 |
| 02:00 | Clear | 20 °C | 2% | 0% | 54% | 763 mm Hg | ESE 121° 2.61 (6.19) m/s | 0 |
| 03:00 | Clear | 19 °C | 3% | 0% | 57% | 764 mm Hg | ESE 119° 2.81 (6.61) m/s | 0 |
| 04:00 | Clear | 19 °C | 3% | 0% | 57% | 764 mm Hg | SE 124° 2.5 (6.11) m/s | 0 |
| 05:00 |  Partly cloudy | 19 °C | 5% | 34% | 58% | 764 mm Hg | SE 137° 2.39 (5.31) m/s | 0 |
| 06:00 |  Cloudy | 21 °C | 8% | 73% | 49% | 764 mm Hg | SE 142° 2.61 (5.72) m/s | 0 |
| 07:00 |  Overcast | 21 °C | 12% | 100% | 50% | 764 mm Hg | SE 140° 2 (4.11) m/s | 0 |
| 08:00 | Overcast | 21 °C | 11% | 100% | 46% | 764 mm Hg | SSE 150° 2.31 (4.33) m/s | 0.5 |
| 09:00 | Overcast | 24 °C | 10% | 100% | 40% | 764 mm Hg | SSE 162° 2.89 (4.64) m/s | 1.5 |
| 10:00 | Overcast | 27 °C | 10% | 100% | 35% | 764 mm Hg | SSE 156° 2.31 (3.19) m/s | 3.2 |
| 11:00 | Overcast | 30 °C | 9% | 100% | 30% | 764 mm Hg | S 169° 2.5 (3.22) m/s | 5.1 |
| 12:00 | Overcast | 32 °C | 9% | 100% | 25% | 764 mm Hg | S 175° 2.81 (3.22) m/s | 6.8 |
| 13:00 | Overcast | 34 °C | 9% | 98% | 22% | 763 mm Hg | S 175° 2.69 (2.92) m/s | 7.6 |
| 14:00 | Overcast | 35 °C | 9% | 100% | 21% | 763 mm Hg | SSE 167° 2.5 (2.81) m/s | 6.9 |
| 15:00 | Overcast | 36 °C | 9% | 100% | 22% | 762 mm Hg | SSE 164° 2.5 (2.89) m/s | 5.2 |
| 16:00 | Overcast | 36 °C | 9% | 100% | 22% | 761 mm Hg | S 171° 2.39 (3) m/s | 3.2 |
| 17:00 | Overcast | 36 °C | 9% | 100% | 23% | 761 mm Hg | S 172° 2.5 (3.11) m/s | 1.5 |
| 18:00 | Overcast | 35 °C | 9% | 100% | 26% | 761 mm Hg | SSE 167° 2.39 (3.53) m/s | 0.4 |
| 19:00 | Overcast | 34 °C | 9% | 100% | 30% | 761 mm Hg | SSE 150° 2.5 (4.61) m/s | 0 |
| 20:00 |  Overcast | 33 °C | 9% | 100% | 33% | 761 mm Hg | SSE 149° 2.81 (6.31) m/s | 0 |
| 21:00 | Overcast | 32 °C | 10% | 100% | 37% | 762 mm Hg | SSE 158° 2.89 (7) m/s | 0 |
| 22:00 | Overcast | 31 °C | 10% | 100% | 40% | 762 mm Hg | SSE 152° 2.89 (6.61) m/s | 0 |
| 23:00 | Overcast | 30 °C | 10% | 99% | 42% | 762 mm Hg | SSE 154° 3 (7) m/s | 0 |
Tue, Sep 8, 2026
Frequently asked questions about the 5-day weather in St. Louis
What will the weather be like in St. Louis over the next 5 days?
Over the next 5 days in St. Louis the temperature is expected to range from about 19 to 37 °C. See the detailed hourly forecast for each of the 5 days in the charts above.
On which of the next 5 days will it rain in St. Louis?
The chance of rain in St. Louis over the next 5 days reaches 56%. Check the 5-day precipitation chart above to see exactly which days and hours bring rain.
How accurate is the 5-day weather forecast for St. Louis?
A 5-day forecast is fairly reliable: the first 2–3 days are usually very accurate, while days 4–5 may be refined. The data is updated several times a day, so check back before important plans.
Which of the next 5 days in St. Louis will be the warmest and which the coolest?
Over the next 5 days the temperature in St. Louis ranges from about 19 to 37 °C. Compare the warmest and coolest day on the temperature chart above.
Will it be windy in St. Louis over the next 5 days?
Over the next 5 days the wind in St. Louis picks up to 6 m/s. The windiest days are easy to spot on the wind chart above.
Which day of the week in St. Louis is best for a walk or a trip?
For a walk or a trip, pick the days with the lowest chance of rain (up to 56%) and light wind — easy to compare on the 5-day charts above.
How can I best use the 5-day forecast for St. Louis?
The first 2–3 days are reliable enough for firm decisions, while days 4–5 are a guide that sharpens as they approach. The forecast is updated several times a day, so check again before important plans.
Will I need an umbrella or sunscreen in St. Louis this week?
Rain reaches a 56% chance across the next 5 days, so pack something waterproof for the wettest of them — the daily strip above shows which. Today’s UV index peaks at 7.6; sunscreen is worth it from about 3 upwards.
St. Louis on the map
Data Sources & Methodology
Our weather forecasts are powered by a professional weather data provider that aggregates data from national weather services, satellite observations, radar networks, and over 80,000 weather stations worldwide. Forecast data is updated multiple times daily. We convert raw data into clear summaries — wind speed in m/s, pressure in mmHg — so you can plan your day with confidence.