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	2.19	2.19	2.31	2.61	2	2.31	2.19	2.39	3.31	3.19	3.31	3.19	3.31	3.31	3.31	3.19	3.11	2.69	2.5	2.5	2.31	2.69	3.31
Wind gust (m/s)	3.72	5.31	6.14	6.11	6.14	4.86	4.72	5.14	5.64	5.61	5.33	5.03	4.53	4.22	4.11	4.31	4.19	4.22	4.61	5.19	5.72	5.11	5.92	8
Wind direction (°)	E 87°	ESE 106°	ESE 121°	ESE 120°	ESE 121°	SE 127°	SE 131°	SE 139°	SE 139°	SSE 149°	SSE 159°	SSE 163°	S 170°	SSE 164°	SSE 158°	SSE 161°	S 170°	S 180°	S 171°	S 172°	SSE 165°	SSE 157°	SSE 154°	SSE 147°

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 (%)	45	48	53	57	60	60	59	56	49	38	31	26	24	24	24	24	24	26	29	32	34	35	37	37

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)	762	762	762	761	761	761	761	761	762	762	762	762	761	761	759	758	758	758	758	758	759	759	759	758

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	0.3	1	2.5	4.3	5.6	6.3	5.8	4.3	2.5	1.1	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)	15.3	13.2	11.7	10.4	9.7	9.6	10	10.7	11	8.4	6.1	5.7	5.6	5.8	6	6	5.6	5.4	6.2	7.7	8.2	8.1	7.7	7.4
PM10 (µg/m³)	15.3	13.3	11.8	10.6	9.8	9.8	10.2	10.9	11.2	8.6	6.3	5.9	5.9	6.2	6.4	6.4	6.1	5.8	6.5	8.1	8.7	8.6	8.2	7.9
Ozone (O₃) (µg/m³)	34	35	36	37	37	33	28	28	36	49	63	80	99	114	123	128	126	112	90	73	65	62	60	60
NO₂ (µg/m³)	39.3	33.8	29.5	25.5	23	23.8	26.1	26.5	22.9	17.2	12.3	8.9	6.2	4.2	2.5	1.5	2.8	8.2	15.7	21.3	23.1	22.8	21.8	20
SO₂ (µg/m³)	3	2.4	2	1.6	1.4	1.3	1.3	1.3	1.3	1.3	1.7	2.7	4.1	5	5.1	4.7	4.2	3.7	3.2	2.8	2.5	2.3	2.2	2.1
CO (µg/m³)	375	379	340	280	238	233	245	253	252	248	237	212	180	156	146	145	151	168	192	206	201	187	175	172

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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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5-day weather forecast St. Louis Sep 29, 2026

Forecast from 17 °C to 31 °C and precipitation

Cloud cover and precipitation probability

Wind speed and direction