5-day weather forecast St. Louis Sep 10, 2026

29°22° · Light rain shower

Weather forecast St. Louis Thursday Sep 10, 2026: light rain shower, temperature from 22 °C to 29 °C.

Precipitation probability 56%. Wind up to 4.81 m/s (gusts 8.42 m/s). Air humidity 34–90%, atmospheric pressure 759–761 mm Hg, UV index up to 3.5.

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

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Sunrise 06:38
Sunset 19:17

New Moon0% illuminated
Moonrise 05:44 · Moonset 18:55

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← Wed, Sep 9

Thu, Sep 10, 2026

Fri, Sep 11 →

Forecast from 22 °C to 29 °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)	24	24	24	24	24	23	22	23	23	23	25	25	26	26	26	27	28	29	29	28	26	24	25	23
Precipitation (mm/hr)	0	0.33	0.23	0.18	0.24	0.15	0.06	0.41	0	0.27	0.01	0.19	0.17	0.01	0.01	0.03	0	0.01	0.18	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 (%)	98	96	100	100	100	100	99	100	100	100	100	100	100	100	100	100	100	100	100	100	0	0	62	0
Rain chance (%)	29	49	45	42	45	41	36	56	27	44	23	35	33	21	19	18	14	12	22	13	1	1	10	1

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)	2.19	2.61	2.81	2.5	2.39	2.5	2.39	2.81	3.31	2.5	4	3.89	4.39	4.39	4.81	4.69	4.31	3.81	3.31	3	2.61	2.81	0.69	2.89
Wind gust (m/s)	3.31	5.11	5.81	4.75	5	4	8.31	8.42	8.11	5.42	6.53	6.22	6.11	5.83	6.61	6.72	6.22	6.03	5.64	5.42	5.03	7.14	2	6.81
Wind direction (°)	E 98°	SSE 158°	SE 138°	ESE 122°	SE 140°	SE 138°	WSW 253°	WSW 258°	WSW 242°	WSW 244°	W 263°	WSW 251°	W 268°	WSW 253°	WSW 256°	W 259°	W 264°	W 269°	W 276°	W 269°	ENE 63°	NE 54°	S 188°	ESE 103°

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 (%)	90	86	87	87	87	88	90	89	86	83	77	77	75	74	71	65	60	52	52	56	34	38	66	43

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)	761	761	761	761	761	761	761	761	761	761	761	761	761	761	761	760	760	759	759	759	761	761	760	761

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	0.1	0.6	1	1.1	2.6	3.5	3	2	2.6	0.7	0.3	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)	12.5	11	9.5	8.3	6.9	5.3	4.7	4.7	4.6	3.8	2.9	2.8	3.1	3.3	3.3	3.5	3.7	3.7	3.9	5.2	7.2	8.4	8.5	7.7
PM10 (µg/m³)	12.7	11.3	9.7	8.5	7.1	5.4	4.9	4.8	4.7	3.9	3	3	3.6	4	4	4.3	4.5	4.6	4.6	5.9	7.9	9.1	9.2	8.3
Ozone (O₃) (µg/m³)	40	50	55	59	61	61	60	60	61	62	66	76	88	98	104	108	108	101	90	78	65	50	40	37
NO₂ (µg/m³)	31.4	25.6	21.4	17.6	14.7	13.4	13.1	12.7	11.8	10.7	9.3	7.1	4.4	2.5	1.4	1	2	4.6	8.6	13.6	21.2	29.9	34.6	32.2
SO₂ (µg/m³)	2.5	2.6	2.3	1.7	1.3	1.1	0.9	0.9	1.1	1.4	1.7	2.1	2.4	2.7	2.8	2.7	2.6	2.4	2.1	1.9	1.9	1.9	1.9	1.7
CO (µg/m³)	216	206	193	177	164	154	147	144	150	162	168	165	156	149	142	136	138	155	179	199	210	215	216	210

← Wed, Sep 9

Thu, Sep 10, 2026

Fri, Sep 11 →

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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.

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