5-day weather forecast Fairfax 03-08-2026

Weather forecast Fairfax Monday, August 3 03.08.2026: partly cloudy, temperature from 22 °C to 31 °C.

Precipitation probability 86%. Wind up to 3.61 m/s (gusts 6.33 m/s). Air humidity 49–99%, atmospheric pressure 756–760 mm Hg, UV index up to 1.6.

Weather Alerts

Hide alerts

MinorAug 1, 06:58 AM — Aug 1, 03:00 PMTranslate with Google

Small Craft Advisory issued August 1 at 6:58AM EDT until August 1 at 11:00PM EDT by NWS Baltimore MD/Washington DC

Small Craft Advisory

* WHAT...Southeast winds 10 to 15 kt expected with gusts up to 20 kt expected. * WHERE...Tidal Potomac River from Key Bridge to Cobb Island MD. * WHEN...From 2 PM this afternoon to 11 PM EDT this evening. * IMPACTS...Conditions will be hazardous to small craft.

Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions.

5 days at a glance — tap a day to open it

Sunrise 06:12
Sunset 20:18

Last Quarter65% illuminated
Moonrise 22:39 · Moonset 11:13

Chart

Table

← Sun, Aug 2

Mon, Aug 3, 2026

Tue, Aug 4 →

Forecast from 22 °C to 31 °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)	22	22	22	22	22	22	22	22	22	22	22	22	24	27	29	30	31	31	30	28	26	24	23	23
Precipitation (mm/hr)	0.79	0.57	2.45	2.09	0.37	0.23	0	0	0	0	0	0	0	0	0	0	0	0	0.06	0	0.65	0	0	0.01

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 (%)	100	100	100	100	100	94	100	100	100	92	83	69	73	48	56	36	54	52	72	33	83	18	39	53
Rain chance (%)	73	68	86	84	60	50	43	43	42	37	34	30	21	8	7	4	5	5	17	8	56	15	19	28

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)	2.81	3.11	3	3.61	3.19	2.61	2.5	2.89	3.11	3.11	2.81	3.11	3.19	3.5	3.31	3	3.19	3	2.5	3.11	3.61	2.89	2.39	2.39
Wind gust (m/s)	4.53	5	4.83	5.78	5.14	4.19	4.17	4.72	5	4.97	4.39	4.86	4.47	4.03	3.81	3.44	3.86	3.94	3.78	5.28	6.33	5.06	4.19	4.14
Wind direction (°)	SSE 157°	S 172°	S 180°	SSW 201°	SSW 204°	SSW 204°	S 182°	S 183°	S 189°	SSW 193°	S 188°	S 187°	SSW 196°	SSW 199°	SSW 207°	SSW 210°	SSW 206°	SSW 204°	S 188°	SSE 168°	S 172°	S 171°	S 170°	S 170°

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 (%)	99	98	98	99	98	98	98	98	98	97	96	95	86	66	56	51	49	50	57	70	83	91	94	96

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)	757	757	756	757	757	757	757	758	758	758	758	758	758	758	758	758	758	758	758	758	759	759	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	0.1	0.3	0.4	0.5	0.5	0.3	1.4	0.8	1.6	1	0.2	0.1	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)	9.9	8.7	7.9	5.4	4.3	3.5	3.4	4	4.5	5.3	5.1	4.8	4.9	4.9	5.1	5.8	7.3	7.6	7.5	7.1	7.6	9.3	11.9	13.9
PM10 (µg/m³)	10.5	9.1	8.2	5.5	4.3	3.5	3.5	4	4.5	5.4	5.1	5	5	5.1	5.4	6.1	7.7	7.9	7.7	7.2	7.7	9.4	12	13.9
Ozone (O₃) (µg/m³)	37	41	44	45	46	48	50	53	60	76	96	111	114	112	110	111	112	111	108	102	92	74	52	36
NO₂ (µg/m³)	21.1	16.5	12.5	10.1	8.2	6.9	6.4	6.4	6.2	5.2	3.9	2.9	2.4	2.2	2.2	2.3	2.6	3.4	4.1	5.3	8.5	16.1	25.6	31.6
SO₂ (µg/m³)	1.5	1.4	1.3	1.2	1.2	1.1	1.1	1	1	1	1	1	1	0.9	0.9	1	1.1	1.2	1.2	1.2	1.3	1.6	2	2.2
CO (µg/m³)	130	125	121	119	117	118	123	130	135	137	138	137	133	128	124	123	123	124	126	128	131	135	139	142