5-day weather forecast St. Louis Sep 8, 2026

19°19–36° · Clear

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

WarningSep 7, 05:53 PM — Sep 9, 12:00 AMTranslate with Google

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/

WarningSep 7, 03:40 PM — Sep 8, 03:45 PMTranslate with Google

Air Quality Alert issued September 7 at 3:40PM CDT by NWS St Louis MO

Air Quality Alert

5 days at a glance — tap a day to open it

Sunrise 06:36
Sunset 19:20

Waning Crescent6% illuminated
Moonrise 03:08 · Moonset 17:54

Chart

Table

Tue, Sep 8, 2026

Wed, Sep 9 →

Forecast from 19 °C to 36 °C and precipitation

Temperature & Precipitation
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Temperature (°C)	22	21	20	19	19	19	21	21	21	24	27	30	32	34	35	36	36	36	35	34	33	32	31	30
Precipitation (mm/hr)	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0

Cloud cover and precipitation probability

Cloud cover & Rain chance
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Cloud cover (%)	0	0	0	0	0	34	73	100	100	100	100	100	100	98	100	100	100	100	100	100	100	100	100	99
Rain chance (%)	2	2	2	3	3	5	8	12	11	10	10	9	9	9	9	9	9	9	9	9	9	10	10	10

Wind speed and direction

Wind & Wind gust
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Wind (m/s)	3.5	3.11	2.61	2.81	2.5	2.39	2.61	2	2.31	2.89	2.31	2.5	2.81	2.69	2.5	2.5	2.39	2.5	2.39	2.5	2.81	2.89	2.89	3
Wind gust (m/s)	9.33	7.61	6.19	6.61	6.11	5.31	5.72	4.11	4.33	4.64	3.19	3.22	3.22	2.92	2.81	2.89	3	3.11	3.53	4.61	6.31	7	6.61	7
Wind direction (°)	ESE 105°	ESE 122°	ESE 121°	ESE 119°	SE 124°	SE 137°	SE 142°	SE 140°	SSE 150°	SSE 162°	SSE 156°	S 169°	S 175°	S 175°	SSE 167°	SSE 164°	S 171°	S 172°	SSE 167°	SSE 150°	SSE 149°	SSE 158°	SSE 152°	SSE 154°

Air humidity

Humidity
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Humidity (%)	49	51	54	57	57	58	49	50	46	40	35	30	25	22	21	22	22	23	26	30	33	37	40	42

Atmospheric pressure

Pressure
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Pressure (mm Hg)	763	763	763	764	764	764	764	764	764	764	764	764	764	763	763	762	761	761	761	761	761	762	762	762

Ultraviolet index

UV Index
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
UV Index	0	0	0	0	0	0	0	0	0.5	1.5	3.2	5.1	6.8	7.6	6.9	5.2	3.2	1.5	0.4	0	0	0	0	0

Air quality & pollen

Air quality
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
PM2.5 (µg/m³)	6.4	6.4	6.6	6.6	6.5	6.5	6.8	7.5	7.2	6.9	7.6	8.8	9.6	10.3	10.9	11.3	11.2	10.9	10.3	10.4	10.2	9.5	9.2	9.3
PM10 (µg/m³)	6.5	6.5	6.7	6.7	6.6	6.7	6.9	7.7	7.2	7	7.7	8.9	9.8	10.6	11.3	11.8	11.8	11.5	10.9	10.8	10.7	10.1	9.8	9.9
Ozone (O₃) (µg/m³)	56	53	49	45	41	35	29	31	48	73	98	120	142	158	168	173	171	158	138	119	102	85	72	65
NO₂ (µg/m³)	15.4	15.5	16.4	17.6	19.1	21.6	24.3	24.6	20.3	13.6	8.1	5.4	4	3.2	2.5	2.3	3.2	5.8	9.4	12.7	15.3	17.5	19	19.8
SO₂ (µg/m³)	1.5	1.5	1.5	1.6	1.6	1.6	1.6	1.7	1.9	2.1	2.7	3.9	5.4	6.5	6.9	6.9	6.7	6.1	5.3	4.5	3.8	3.2	2.7	2.4
CO (µg/m³)	172	173	172	171	173	181	192	201	208	213	210	193	170	152	147	148	152	158	167	174	180	185	186	181

Tue, Sep 8, 2026

Wed, Sep 9 →

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.

Learn more about our methodology →