5-day weather forecast Fairfax 04-08-2026

Weather forecast Fairfax Tuesday, August 4 04.08.2026: fog, temperature from 22 °C to 26 °C.

Precipitation probability 64%. Wind up to 2.39 m/s (gusts 4.11 m/s). Air humidity 78–99%, atmospheric pressure 761–764 mm Hg, UV index up to 7.6.

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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 06:13
Sunset 20:17

Last Quarter55% illuminated
Moonrise 23:04 · Moonset 12:15

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Forecast from 22 °C to 26 °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)	23	22	22	22	22	22	22	22	23	24	25	25	25	24	24	25	25	25	26	25	24	23	22	22
Precipitation (mm/hr)	0.22	0	0	0	0	0	0	0	0	0.01	0.01	0.11	0.04	0.05	0.03	0.33	0.31	0.23	0.09	0.38	0.46	0.2	0.34	0.09

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 (%)	78	100	100	100	100	100	100	100	98	79	81	100	70	73	100	86	96	95	87	100	59	84	100	100
Rain chance (%)	46	43	43	43	43	43	43	43	38	26	23	35	22	25	30	48	45	40	27	52	50	45	64	53

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)	2.19	1.81	1.5	1.5	1.5	1	1	0.81	1.11	1.31	1.39	1.81	2.11	2.11	1.89	2.19	2.31	2.11	1.89	2	2.39	2.11	2.19	2.11
Wind gust (m/s)	3.78	3.08	2.58	2.56	2.53	1.67	1.64	1.25	1.61	1.75	1.75	2.36	2.86	2.97	2.72	3.06	3.33	3.14	2.72	3.17	4.11	3.5	3.56	3.33
Wind direction (°)	S 183°	S 186°	S 184°	S 177°	S 176°	SSE 163°	S 173°	SSE 148°	SSE 158°	SSE 160°	SE 142°	SSE 162°	S 179°	S 185°	S 177°	S 178°	S 175°	S 171°	SSE 162°	SSE 162°	SSE 151°	SSE 147°	S 171°	S 174°

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 (%)	98	98	99	99	99	99	99	98	95	92	85	83	84	86	86	82	83	82	78	86	93	97	98	99

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	761	761	761	762	763	762	763	763	763	763	763	763	763	763	763	763	763	764	764

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	0.3	1.6	4.1	6.1	7.2	7.6	4.4	5	4.5	2.3	1.2	0.3	0	0	0	0

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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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