5-day weather forecast Fairfax 01-08-2026

Weather forecast Fairfax today 01.08.2026: sunny, temperature from 19 °C to 32 °C.

Precipitation probability 10%. Wind up to 4.5 m/s (gusts 7.39 m/s). Air humidity 35–83%, atmospheric pressure 758–761 mm Hg, UV index up to 6.7.

Weather Alerts

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MinorJul 31, 07:41 PMAug 1, 03:45 AMTranslate with Google
Small Craft Advisory issued July 31 at 7:41PM EDT until August 1 at 11:00PM EDT by NWS Baltimore MD/Washington DC

Small Craft Advisory

* WHAT...Southeast winds 10 to 15 kt with gusts up to 20 kt expected. * WHERE...Tidal Potomac River from Key Bridge to Cobb Island MD. * WHEN...From 2 PM to 11 PM EDT Saturday. * IMPACTS...Conditions will be hazardous to small craft.
Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions.
Sunrise 06:10
Sunset 20:20
Waning Gibbous83% illuminated
Moonrise 21:56 · Moonset 09:13
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Table
Sat, Aug 1, 2026

Forecast from 19 °C to 32 °C and precipitation

Temperature & Precipitation
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
Temperature (°C)222120202019192023252732323232323232302927262524
Precipitation (mm/hr)000000000000000000000000

Cloud cover and precipitation probability

Cloud cover & Rain chance
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
Cloud cover (%)000000000009242825191012454750443334
Rain chance (%)467891010107542222211456768

Wind speed and direction

Wind & Wind gust
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
Wind (m/s)1.891.51.311.191.311.391.611.6922.312.52.893.393.814.114.314.113.692.893.194.314.54.194.11
Wind gust (m/s)3.973.082.642.422.612.863.223.173.173.083.143.363.924.364.725.175.225.064.785.427.257.396.816.86
Wind direction (°)S 178°SSW 195°S 191°S 190°S 184°S 182°S 174°S 177°S 187°S 179°S 174°S 177°S 176°S 177°S 178°S 180°S 178°SSE 168°SSE 157°SE 133°SE 129°SE 142°SE 145°SSE 150°

Air humidity

Humidity
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
Humidity (%)647275787983828375696252454340373538435058616469

Atmospheric pressure

Pressure
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
Pressure (mm Hg)761761761761761761761761761761761761760760759759758758758758758759759759

Ultraviolet index

UV Index
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
UV Index00000000.20.81.93.64.86.76.45.35.14.22.30.90.30000

Air quality & pollen

Air quality
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
PM2.5 (µg/m³)8.88.38.187.97.67.16.87.277.586.76.36.97.99.110.111.111.8121210.99.4
PM10 (µg/m³)8.88.38.18.17.97.67.16.87.277.68.26.86.47.18.19.310.411.512.212.512.511.39.8
Ozone (O₃) (µg/m³)65686966615856576382107125128124120118116113109105100948883
NO₂ (µg/m³)16.91411.610.610.210.110.511.110.88.85.93.62.52.11.91.822.53.54.75.65.965.8
SO₂ (µg/m³)3.43.133.13.43.63.53.22.92.52.122.43.13.84.55.35.65.24.33.63.12.82.6
CO (µg/m³)158150146145148152160171175168154142135129126125126128131135138140140140
Sat, Aug 1, 2026

Frequently asked questions about the 5-day weather in Fairfax

Over the next 5 days in Fairfax the temperature is expected to range from about 19 to 32 °C. See the detailed hourly forecast for each of the 5 days in the charts above.

The chance of rain in Fairfax over the next 5 days reaches 95%. Check the 5-day precipitation chart above to see exactly which days and hours bring rain.

A 5-day forecast is fairly reliable: the first 2–3 days are usually very accurate, while days 4–5 may be refined. The data is updated several times a day, so check back before important plans.

Over the next 5 days the temperature in Fairfax ranges from about 19 to 32 °C. Compare the warmest and coolest day on the temperature chart above.

Over the next 5 days the wind in Fairfax picks up to 5 m/s. The windiest days are easy to spot on the wind chart above.

For a walk or a trip, pick the days with the lowest chance of rain (up to 95%) and light wind — easy to compare on the 5-day charts above.

The first 2–3 days are reliable enough for firm decisions, while days 4–5 are a guide that sharpens as they approach. The forecast is updated several times a day, so check again before important plans.

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.