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)	4.11	3.5	3.5	3.69	3.81	3.39	2.69	2.39	4.19	4.39	4.5	5.19	7.11	7.39	6.61	7.11	7.5	7.61	7.61	8.11	7.39	6.39	5	4.19
Wind gust (m/s)	8.61	6.97	6.69	6.58	6.64	6.06	4.69	3.89	7.36	6.58	7.5	7.14	8.17	8.5	7.58	8.17	8.67	11.39	13.22	12.72	10.97	9.36	8.14	7.03
Wind direction (°)	SE 140°	SSE 153°	SSE 157°	SSE 150°	SSE 157°	SSE 152°	S 183°	SSW 205°	SSE 161°	SSE 167°	SSE 157°	SSE 158°	SSE 160°	SSE 164°	SSE 165°	SE 146°	SE 137°	SE 125°	SE 133°	SE 143°	SSE 157°	S 172°	S 186°	S 183°

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 (%)	69	69	70	70	70	72	73	89	90	80	79	75	58	53	51	48	47	57	61	60	62	64	77	86

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	760	761	761	760	759	759	759	758	758	757	755	755	754	754	753	753	753	754	753

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	0.9	0.9	2	2	5.7	8.5	6.2	1.1	0.2	0.2	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)	4.9	4.6	4.5	4.5	4.8	5.1	5.4	5.6	5.7	6.6	7	6.9	8.1	8.5	8.8	9.5	9.6	9	8.6	7.9	7.8	7.9	7.3	6.1
PM10 (µg/m³)	5	4.7	4.6	4.6	4.9	5.2	5.5	5.7	5.8	6.8	7.2	7.1	8.6	8.9	9.1	9.9	10	9.4	8.9	8.2	8.1	8.2	7.6	6.3
Ozone (O₃) (µg/m³)	59	57	51	45	40	36	34	39	58	84	103	109	108	108	111	115	116	113	109	104	101	98	95	90
NO₂ (µg/m³)	12.9	12.7	13.5	14.7	15.6	16	16	15	12.1	8.3	5.4	4.5	4.5	4.5	3.9	3.3	3.1	3.6	4.5	5.2	5.6	5.9	6.1	6
SO₂ (µg/m³)	0.9	1	1.1	1.3	1.5	1.8	2.1	2.5	2.9	3.2	3.5	3.8	3.9	3.9	3.5	2.8	2.2	1.8	1.6	1.4	1.3	1.3	1.3	1.3
CO (µg/m³)	187	185	180	172	166	166	168	168	162	154	146	140	135	132	130	130	131	136	143	147	146	142	139	137

← Thu, Jul 30

Fri, Jul 31, 2026

Sat, Aug 1 →

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 →