Fairfax in Fall
In fall (September, October and November), Fairfax sees average daytime highs around 68°F and overnight lows near 51°F, with 10.7 in of precipitation over about 25 wet days across the season. It is the 2nd-warmest season and the 3rd-wettest season.
Over the season highs ease from about 83°F in early September to 52°F by late November. The sky is clear or mostly clear about 39% of the time across fall, and the air most often feels dry.
Fall is Fairfax's best season of the year to visit on our travel score. For the whole year in context, see Fairfax's year-round climate.
- Avg daytime high
- 68°F
- 2nd-warmest season
- Avg overnight low
- 51°F
- Precipitation
- 10.7 in
- 25 wet days
- Avg wind
- 6 mph
- Travel score
- 5.9
- best season of the year
- Months
- Sep · Oct · Nov
Temperature in Fairfax in Fall
Over the season highs ease from about 83°F in early September to 52°F by late November.
A typical fall day in Fairfax reaches about 68°F and drops to 51°F overnight. The warmest of the three months is September, the coolest November.
How fall really feels in Fairfax
Once humidity and wind are folded in, fall brings about 0 days that feel above 90°F and 3 that feel at or below 32°F.
The story in fall is cold — wind chill drags the overnight "feels like" below the raw low.
Fairfax weather by month
How the three fall months (September, October and November) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 43° / 29° | 3.1 | 8.7 | 2.8 | 9.6 | 0.6 |
| Feb | 46° / 31° | 2.8 | 8.5 | 2.5 | 10.5 | 1.4 |
| Mar | 55° / 38° | 3.9 | 10.3 | 1.7 | 11.7 | 3.5 |
| Apr | 66° / 48° | 3.4 | 9.9 | 0 | 13 | 6.0 |
| May | 75° / 57° | 3.7 | 11.4 | 0 | 14.1 | 6.5 |
| Jun | 84° / 66° | 3.5 | 11.4 | 0 | 14.7 | 5.4 |
| Jul | 88° / 71° | 3.8 | 11.7 | 0 | 14.4 | 4.3 |
| Aug | 86° / 69° | 3.5 | 10.1 | 0 | 13.5 | 5.1 |
| Sep | 79° / 62° | 4.3 | 9.4 | 0 | 12.3 | 6.8 |
| Oct | 67° / 51° | 3.4 | 7.9 | 0 | 11 | 6.6 |
| Nov | 56° / 40° | 2.9 | 7.6 | 0.2 | 9.9 | 4.2 |
| Dec | 47° / 33° | 3.4 | 8.9 | 1.6 | 9.3 | 1.6 |
Cloud cover in Fall
The sky is clear or mostly clear about 39% of the time across fall.
Chance of precipitation in Fall
Fairfax gets around 10.7 in of rain and snow over 25 wet days across fall. The line is the day-by-day chance of measurable precipitation.
Humidity in Fall
Most of fall feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Fall
Winds average 6 mph across fall.
Sunrise & sunset in Fall
Daylight runs from about 12 h 54 min in early September to 9 h 30 min by late November. The lit band spans sunrise to sunset each day.
Solar energy in Fall
Average shortwave solar energy reaching the ground each day across fall, about 3.4 kWh/m².
Is fall a good time to visit Fairfax?
Our two travel scores rate fall for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
fall is a reasonable time to visit Fairfax for sightseeing.
What to pack for Fairfax in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Fairfax sees daytime highs around 68°F and nights near 51°F. Worth packing: light clothes, a warm layer and rain gear. About 25 days see rain.
UV index in Fairfax in Fall
Clear-sky midday UV across fall averages around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Fairfax peaks around July 11 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 2 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 3 | 5 | 6 | 8 | 9 | 9 | 7 | 6 | 4 | 3 | 2 |
| Level | Moderate | Moderate | High | High | Very high | Very high | Very high | High | High | Moderate | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Moderate |
| Feb | 3 | Moderate |
| Mar | 5 | High |
| Apr | 6 | High |
| May | 8 | Very high |
| Jun | 9 | Very high |
| Jul | 9 | Very high |
| Aug | 7 | High |
| Sep | 6 | High |
| Oct | 4 | Moderate |
| Nov | 3 | Moderate |
| Dec | 2 | Low |
Air quality in Fairfax in Fall
Average fine-particle pollution (PM2.5) through the year — so you can see where fall falls, not just the annual average.
Air quality in Fairfax is worst in July — around 17 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (November, 9 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 11 | 12 | 13 | 13 | 15 | 16 | 17 | 15 | 12 | 9 | 9 | 10 |
| Level | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 11 | Good |
| Feb | 12 | Moderate |
| Mar | 13 | Moderate |
| Apr | 13 | Moderate |
| May | 15 | Moderate |
| Jun | 16 | Moderate |
| Jul | 17 | Moderate |
| Aug | 15 | Moderate |
| Sep | 12 | Moderate |
| Oct | 9 | Good |
| Nov | 9 | Good |
| Dec | 10 | Good |
Where is Fairfax?
Fairfax sits at 38.8°N, 77.3°W, 430 ft above sea level, in United States. The nearest listed city is Oakton, 2.5 mi away.
Topography around Fairfax
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Fairfax.
Within 2 miles, the terrain around Fairfax has only modest variations in elevation — a maximum elevation change of 272 ft around an average of 410 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 607 ft; within 50 miles, large variations in elevation — a maximum elevation change of 3,514 ft.
The land around Fairfax is covered by trees (64%) and artificial surfaces (26%) within 2 miles, trees (78%) within 10 miles, and trees (65%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Fairfax (38.8462°, -77.3064°, elevation 430 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.