Fairfax, VA Weather Forecast
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Fairfax Weather Forecast
| THIS AFTERNOON | TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT |
| Chance of T-Storm | Chance of T-Storm | Partly Sunny | Partly Cloudy | Partly Sunny | Mostly Cloudy | Partly Sunny | Chance of Showers | Chance of Showers | Showers | Showers | Chance of Showers |
| Hi: 89°FHi: 32°C | Lo: 71°FLo: 22°C | Hi: 85°FHi: 29°C | Lo: 65°FLo: 18°C | Hi: 79°FHi: 26°C | Lo: 65°FLo: 18°C | Hi: 81°FHi: 27°C | Lo: 65°FLo: 18°C | Hi: 79°FHi: 26°C | Lo: 61°FLo: 16°C | Hi: 65°FHi: 18°C | Lo: 55°FLo: 13°C |
| POP: 50% | POP: 50% | POP: 50% | POP: 50% | POP: 60% | POP: 60% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 226 PM EDT Thu Sep 17 2026 

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Issued: 337 PM EDT Thu Sep 17 2026
Key Messages
- 1) Shower and thunderstorm chances shift southward with a cold front through Friday, which will be followed by cooler temperatures.
- 2) Showers and thunderstorms return at times Sunday into next week, with temperatures likely falling below normal.
Discussion
... KEY MESSAGE 1...Shower and thunderstorm chances shift southward with a cold front through Friday, which will be followed by cooler temperatures.
Height falls amidst a humid airmass resulted in showers and thunderstorms expanding ...
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