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)	9.89	10.11	9.81	9.69	9.5	9.31	9.5	9.69	9.39	9.31	9.31	9.81	9.81	9.69	8.81	7.81	7.81	7.11	5.89	5	4	3.39	2.69	2.19
Wind gust (m/s)	13.06	14	13.58	13.28	13.28	12.81	12.97	13.19	12.61	11.56	10.69	11.28	11.28	11.17	10.11	9.17	8.97	8.72	8.03	7.97	7.94	7.14	5.67	4.61
Wind direction (°)	NNW 329°	NNW 334°	NNW 338°	NNW 333°	NNW 331°	NNW 330°	NNW 334°	NNW 338°	NNW 342°	NNW 346°	N 350°	N 356°	N 1°	N 4°	NNE 12°	NNE 16°	NNE 13°	NNE 13°	NNE 16°	NNE 23°	NE 35°	NE 51°	NE 56°	NE 42°

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 (%)	85	86	84	82	80	77	76	76	79	78	72	63	57	52	52	50	46	48	52	59	67	71	74	77

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)	758	757	758	758	758	758	758	758	759	760	760	760	760	760	759	759	759	759	758	759	759	760	760	760

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	1.1	2.9	5.4	7	7.8	6.9	5.2	5.1	3.2	1.5	0.5	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)	2.1	2.1	2.2	2.1	2.1	2	2	2	2	1.9	2.2	2.6	3	3.4	3.6	3.8	4	4.2	4.3	4	3.7	3.4	3.2	3.2
PM10 (µg/m³)	2.1	2.2	2.2	2.2	2.2	2.1	2.1	2.1	2.1	2	2.3	2.8	3.2	3.6	3.8	4	4.2	4.4	4.5	4.2	3.8	3.5	3.3	3.3
Ozone (O₃) (µg/m³)	76	73	71	69	67	65	64	63	62	62	64	72	82	90	93	94	94	93	92	88	82	74	66	60
NO₂ (µg/m³)	2.8	3.1	3.4	3.7	4	4.3	4.5	4.4	3.9	3.2	2.5	1.9	1.2	0.8	0.6	0.6	0.7	0.8	1.1	1.6	2.6	3.8	5	6.1
SO₂ (µg/m³)	0.6	0.6	0.6	0.7	0.7	0.7	0.6	0.5	0.5	0.4	0.4	0.4	0.4	0.5	0.6	0.8	1	1.1	1.2	1.3	1.3	1.2	1.2	1.2
CO (µg/m³)	130	130	129	128	128	129	132	134	137	139	140	137	133	130	129	130	131	132	134	136	139	142	145	147

← Fri, Jul 31

Sat, Aug 1, 2026

Sun, Aug 2 →

Fairfax 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 →