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)	3.31	2.11	1.89	2.31	1.89	1.11	1.61	2.19	2.39	2.81	4.61	3.5	3.89	6.61	4.31	3.39	4.31	3.19	3.5	4.81	3.11	2.69	2.81	2.39
Wind gust (m/s)	9.44	6.03	5.61	5.61	5.31	1.31	2.5	4.89	6.53	7.31	7.81	7.89	5.89	8.83	5.61	3.89	4.31	3.81	4.5	6.19	6.69	6.22	6.33	5.42
Wind direction (°)	SE 144°	SE 138°	S 169°	SSW 204°	WSW 251°	SW 219°	ESE 104°	ENE 68°	NNE 14°	ENE 63°	ENE 72°	E 90°	E 101°	ESE 117°	E 100°	ESE 104°	E 88°	E 88°	ENE 75°	ENE 61°	ENE 68°	ENE 59°	NE 56°	ENE 69°

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 (%)	70	73	73	74	70	86	75	89	93	95	84	92	79	66	65	62	64	66	66	76	82	86	87	88

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)	760	760	760	761	761	761	761	761	762	761	760	761	761	759	759	760	759	759	759	759	759	760	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	0.1	0.1	1.4	1.2	2.5	2.2	7.3	3.9	2.5	1.4	1	0.7	0.2	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)	9.1	7.8	6.5	6	5.7	5.4	5.7	6.9	6.6	6.9	6.9	7.2	8.1	9.4	9.7	9.6	9.8	10	10.4	11	12.7	13.3	14.5	7.4
PM10 (µg/m³)	9.2	7.9	6.6	6	5.7	5.4	5.7	7	6.6	7	7.2	7.6	8.4	9.7	10.1	10.1	10.3	10.5	10.9	11.6	13.3	13.9	15.1	7.7
Ozone (O₃) (µg/m³)	66	63	61	61	60	57	53	54	63	78	93	109	127	140	148	153	151	141	126	110	93	75	62	57
NO₂ (µg/m³)	21.7	19.1	17	15.1	14.7	17.6	21.9	23.7	20.3	14.2	9.2	6.7	5.2	4.2	3.1	2.4	3.3	6.5	11.2	16.2	22.4	29	31.8	27.8
SO₂ (µg/m³)	3	2.2	1.9	1.8	1.9	2.1	2.3	2.6	2.8	3.1	3.5	4.3	5.3	6	6.3	6.3	6.2	5.8	5.3	4.8	4.4	4.1	3.7	3
CO (µg/m³)	190	184	177	169	163	158	156	160	179	204	216	202	174	153	144	141	144	159	181	192	181	159	144	148

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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 19-08-2026

Forecast from 20 °C to 27 °C and precipitation

Cloud cover and precipitation probability

Wind speed and direction