5-day weather forecast Fairfax Sep 12, 2026
21°Weather forecast Fairfax today Sep 12, 2026: overcast, temperature from 20 °C to 28 °C.
Precipitation probability 89%. Wind up to 4.31 m/s (gusts 12 m/s). Air humidity 59–98%, atmospheric pressure 761–764 mm Hg, UV index up to 4.2.
5 days at a glance — tap a day to open it
Sunrise 06:48
Sunset 19:22
Sunset 19:22
New Moon3% illuminated
Moonrise 08:19 · Moonset 19:55
Moonrise 08:19 · Moonset 19:55
Chart
TableSat, Sep 12, 2026
Forecast from 20 °C to 28 °C and precipitation
Cloud cover and precipitation probability
Wind speed and direction
Air humidity
Atmospheric pressure
Ultraviolet index
Air quality & pollen
Sat, Sep 12, 2026
Frequently asked questions about the 5-day weather in Fairfax
What will the weather be like in Fairfax over the next 5 days?
Over the next 5 days in Fairfax the temperature is expected to range from about 15 to 30 °C. See the detailed hourly forecast for each of the 5 days in the charts above.
On which of the next 5 days will it rain in Fairfax?
The chance of rain in Fairfax over the next 5 days reaches 94%. Check the 5-day precipitation chart above to see exactly which days and hours bring rain.
How accurate is the 5-day weather forecast for Fairfax?
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.
Which of the next 5 days in Fairfax will be the warmest and which the coolest?
Over the next 5 days the temperature in Fairfax ranges from about 15 to 30 °C. Compare the warmest and coolest day on the temperature chart above.
Will it be windy in Fairfax over the next 5 days?
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.
Which day of the week in Fairfax is best for a walk or a trip?
For a walk or a trip, pick the days with the lowest chance of rain (up to 94%) and light wind — easy to compare on the 5-day charts above.
How can I best use the 5-day forecast for Fairfax?
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.
Will I need an umbrella or sunscreen in Fairfax this week?
Rain reaches a 94% chance across the next 5 days, so pack something waterproof for the wettest of them — the daily strip above shows which. Today’s UV index peaks at 4.2; sunscreen is worth it from about 3 upwards.
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.