5-day weather forecast Fairfax 05-08-2026
Weather forecast Fairfax Wednesday, August 5 05.08.2026: partly cloudy, temperature from 21 °C to 33 °C.
Precipitation probability 44%. Wind up to 5.19 m/s (gusts 7.89 m/s). Air humidity 45–99%, atmospheric pressure 763–765 mm Hg, UV index up to 8.
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 06:14
Sunset 20:16
Sunset 20:16
Last Quarter44% illuminated
Moonrise 23:33 · Moonset 13:21
Moonrise 23:33 · Moonset 13:21
Chart
Table
Wed, Aug 5, 2026
| Temperature | Rain chance | Cloud cover | Humidity | Pressure | Wind | UV Index | ||
|---|---|---|---|---|---|---|---|---|
| 00:00 |  Fog | 22 °C | 44% (0.01 mm/hr) | 100% | 99% | 764 mm Hg | S 173° 2.61 (4.14) m/s | 0 |
| 01:00 | Fog | 22 °C | 43% (0.01 mm/hr) | 100% | 98% | 764 mm Hg | S 178° 3 (4.72) m/s | 0 |
| 02:00 | Fog | 22 °C | 42% | 100% | 98% | 764 mm Hg | S 180° 2.89 (4.56) m/s | 0 |
| 03:00 | Fog | 21 °C | 42% | 100% | 98% | 764 mm Hg | S 190° 2.69 (4.39) m/s | 0 |
| 04:00 | Fog | 21 °C | 43% | 100% | 98% | 764 mm Hg | S 183° 2.39 (3.97) m/s | 0 |
| 05:00 | Fog | 21 °C | 43% | 100% | 98% | 764 mm Hg | S 175° 2.39 (4.06) m/s | 0 |
| 06:00 | Fog | 21 °C | 42% | 100% | 98% | 764 mm Hg | S 182° 2.39 (4.06) m/s | 0 |
| 07:00 |  Fog | 21 °C | 42% | 100% | 97% | 764 mm Hg | S 183° 2.31 (3.75) m/s | 0.1 |
| 08:00 |  Partly cloudy | 22 °C | 22% | 57% | 92% | 765 mm Hg | SSW 194° 2.69 (3.94) m/s | 0.6 |
| 09:00 |  Sunny | 23 °C | 12% | 21% | 84% | 765 mm Hg | SSW 199° 3 (3.92) m/s | 6 |
| 10:00 | Partly cloudy | 26 °C | 9% | 33% | 72% | 764 mm Hg | SSW 193° 3.39 (3.92) m/s | 7 |
| 11:00 | Partly cloudy | 28 °C | 6% | 38% | 62% | 764 mm Hg | S 190° 3.89 (4.5) m/s | 7 |
| 12:00 | Partly cloudy | 30 °C | 5% | 38% | 56% | 764 mm Hg | SSW 193° 4.19 (4.83) m/s | 7 |
| 13:00 |  Cloudy | 32 °C | 9% | 83% | 50% | 764 mm Hg | SSW 195° 4.5 (5.17) m/s | 7 |
| 14:00 |  Overcast | 33 °C | 10% | 100% | 45% | 764 mm Hg | SSW 194° 4.69 (5.42) m/s | 7 |
| 15:00 | Cloudy | 33 °C | 6% | 70% | 45% | 763 mm Hg | SSW 192° 4.61 (5.72) m/s | 7 |
| 16:00 | Partly cloudy | 31 °C | 4% | 34% | 51% | 763 mm Hg | SSE 164° 3.5 (5.67) m/s | 8 |
| 17:00 | Partly cloudy | 30 °C | 4% | 30% | 54% | 763 mm Hg | SSE 165° 4.69 (7.5) m/s | 8 |
| 18:00 | Partly cloudy | 31 °C | 4% | 29% | 54% | 763 mm Hg | S 180° 5.19 (7.89) m/s | 8 |
| 19:00 | Partly cloudy | 29 °C | 5% | 31% | 58% | 763 mm Hg | S 188° 4.61 (7.64) m/s | 7 |
| 20:00 | Sunny | 28 °C | 5% | 23% | 63% | 763 mm Hg | S 190° 3.89 (6.67) m/s | 7 |
| 21:00 |  Clear | 27 °C | 6% | 16% | 70% | 764 mm Hg | S 185° 3.31 (6) m/s | 0 |
| 22:00 | Clear | 26 °C | 8% | 15% | 75% | 764 mm Hg | S 180° 3.11 (5.83) m/s | 0 |
| 23:00 |  Patchy rain possible | 26 °C | 19% (0.01 mm/hr) | 87% | 75% | 764 mm Hg | SSW 193° 3.5 (6.11) m/s | 0 |
Wed, Aug 5, 2026
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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.