5-day weather forecast Fairfax Oct 21, 2026

23°12° · Sunny

Weather forecast Fairfax Wednesday Oct 21, 2026: sunny, temperature from 12 °C to 23 °C.

Precipitation probability 21%. Wind up to 4.81 m/s (gusts 10.33 m/s). Air humidity 43–74%, atmospheric pressure 765–767 mm Hg, UV index up to 4.4.

Sunrise 07:38
Sunset 18:33
Waxing Gibbous86% illuminated
Moonrise 16:25 · Moonset 02:59
Chart
Table

Forecast from 12 °C to 23 °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)151413131212121212131619202223232323201817171616
Precipitation (mm/hr)00000000.070.01000000000000000

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 (%)9255719926295778600000000005510003
Rain chance (%)1611142099721195322111112341434

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)3.693.193.193.1133.313.113.113.313.314.314.54.694.694.614.814.814.393.193.53.53.533.39
Wind gust (m/s)10.339.338.227.338.117.57.146.257.038.037.226.726.56.035.615.645.425.315.725.617.116.946.116.31
Wind direction (°)S 172°S 172°S 171°S 172°S 174°S 172°S 174°S 169°S 171°S 173°S 186°S 184°S 186°S 185°S 184°S 189°S 183°S 176°S 171°S 169°SSE 160°SSE 160°SSE 165°SSE 163°

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 (%)677073737373737374685752484644434446545859596062

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)767767767767767767767767767767767767767767766765765765765766766766766767

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 Index0000000000.31.12.43.74.44.33.420.90.200000

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)8.58.58.89.39.59.79.79.69.69.27.26.35.85.75.96.16.16.16.16.46.56.66.86.9
PM10 (µg/m³)8.78.799.49.69.79.99.79.79.37.36.465.96.16.36.36.36.36.66.76.86.97.1
Ozone (O₃) (µg/m³)545047454342414142445166859910610910798857469666359
NO₂ (µg/m³)88.79.19.39.39.39.18.77.96.95.74.22.51.30.70.50.92.245.56.36.77.38.1
SO₂ (µg/m³)1.51.51.41.31.10.90.80.70.70.70.80.91.11.21.21.21.110.90.911.21.41.6
CO (µg/m³)173174171164159155152150150150150147143140139140144154166173.8179184.3193200

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.