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.
Weather Alerts
Hide alertsSmall 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
Sunset 20:17
Last Quarter55% illuminated
Moonrise 23:04 · Moonset 12:15
Moonrise 23:04 · Moonset 12:15
Chart
Table
| Temperature | Rain chance | Cloud cover | Humidity | Pressure | Wind | UV Index | ||
|---|---|---|---|---|---|---|---|---|
| 00:00 |  Light rain shower | 23 °C | 46% (0.22 mm/hr) | 78% | 98% | 761 mm Hg | S 183° 2.19 (3.78) m/s | 0 |
| 01:00 |  Fog | 22 °C | 43% | 100% | 98% | 761 mm Hg | S 186° 1.81 (3.08) m/s | 0 |
| 02:00 | Fog | 22 °C | 43% | 100% | 99% | 761 mm Hg | S 184° 1.5 (2.58) m/s | 0 |
| 03:00 | Fog | 22 °C | 43% | 100% | 99% | 761 mm Hg | S 177° 1.5 (2.56) m/s | 0 |
| 04:00 | Fog | 22 °C | 43% | 100% | 99% | 761 mm Hg | S 176° 1.5 (2.53) m/s | 0 |
| 05:00 | Fog | 22 °C | 43% | 100% | 99% | 761 mm Hg | SSE 163° 1 (1.67) m/s | 0 |
| 06:00 | Fog | 22 °C | 43% | 100% | 99% | 761 mm Hg | S 173° 1 (1.64) m/s | 0 |
| 07:00 |  Fog | 22 °C | 43% | 100% | 98% | 761 mm Hg | SSE 148° 0.81 (1.25) m/s | 0.1 |
| 08:00 |  Mist | 23 °C | 38% | 98% | 95% | 762 mm Hg | SSE 158° 1.11 (1.61) m/s | 0.3 |
| 09:00 |  Patchy rain possible | 24 °C | 26% (0.01 mm/hr) | 79% | 92% | 763 mm Hg | SSE 160° 1.31 (1.75) m/s | 1.6 |
| 10:00 | Patchy rain possible | 25 °C | 23% (0.01 mm/hr) | 81% | 85% | 762 mm Hg | SE 142° 1.39 (1.75) m/s | 4.1 |
| 11:00 | Patchy rain possible | 25 °C | 35% (0.11 mm/hr) | 100% | 83% | 763 mm Hg | SSE 162° 1.81 (2.36) m/s | 6.1 |
| 12:00 | Patchy rain possible | 25 °C | 22% (0.04 mm/hr) | 70% | 84% | 763 mm Hg | S 179° 2.11 (2.86) m/s | 7.2 |
| 13:00 | Patchy rain possible | 24 °C | 25% (0.05 mm/hr) | 73% | 86% | 763 mm Hg | S 185° 2.11 (2.97) m/s | 7.6 |
| 14:00 | Patchy rain possible | 24 °C | 30% (0.03 mm/hr) | 100% | 86% | 763 mm Hg | S 177° 1.89 (2.72) m/s | 4.4 |
| 15:00 |  Light drizzle | 25 °C | 48% (0.33 mm/hr) | 86% | 82% | 763 mm Hg | S 178° 2.19 (3.06) m/s | 5 |
| 16:00 |  Light rain shower | 25 °C | 45% (0.31 mm/hr) | 96% | 83% | 763 mm Hg | S 175° 2.31 (3.33) m/s | 4.5 |
| 17:00 | Light rain shower | 25 °C | 40% (0.23 mm/hr) | 95% | 82% | 763 mm Hg | S 171° 2.11 (3.14) m/s | 2.3 |
| 18:00 | Patchy rain possible | 26 °C | 27% (0.09 mm/hr) | 87% | 78% | 763 mm Hg | SSE 162° 1.89 (2.72) m/s | 1.2 |
| 19:00 | Light rain shower | 25 °C | 52% (0.38 mm/hr) | 100% | 86% | 763 mm Hg | SSE 162° 2 (3.17) m/s | 0.3 |
| 20:00 | Light rain shower | 24 °C | 50% (0.46 mm/hr) | 59% | 93% | 763 mm Hg | SSE 151° 2.39 (4.11) m/s | 0 |
| 21:00 | Light rain shower | 23 °C | 45% (0.2 mm/hr) | 84% | 97% | 763 mm Hg | SSE 147° 2.11 (3.5) m/s | 0 |
| 22:00 |  Light drizzle | 22 °C | 64% (0.34 mm/hr) | 100% | 98% | 764 mm Hg | S 171° 2.19 (3.56) m/s | 0 |
| 23:00 | Fog | 22 °C | 53% (0.09 mm/hr) | 100% | 99% | 764 mm Hg | S 174° 2.11 (3.33) m/s | 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.