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Washington County Weather Forecast
| TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY |
 |  |  |  | | |  |  |  |  | | |
| Mostly Clear | Partly Sunny | Partly Cloudy | Patchy Fog | Partly Cloudy | Partly Sunny | Mostly Cloudy | Chance of Rain | Chance of Rain | Chance of T-Storm | Partly Cloudy | Partly Sunny |
| Lo: 51°FLo: 11°C | Hi: 79°FHi: 26°C | Lo: 51°FLo: 11°C | Hi: 75°FHi: 24°C | Lo: 49°FLo: 9°C | Hi: 71°FHi: 22°C | Lo: 51°FLo: 11°C | Hi: 69°FHi: 21°C | Lo: 50°FLo: 10°C | Hi: 61°FHi: 16°C | Lo: 45°FLo: 7°C | Hi: 65°FHi: 18°C |
| POP: 50% | POP: 50% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 502 PM PDT Sun Sep 20 2026 
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Issued: 1052 PM PDT Sun Sep 20 2026
Aviation
...Through 06Z Tuesday...Late this evening satellite imagery and observations show building coastal low stratus expected to fill in northward over the next several hours. Similar to previous mornings, we`ll see a return of patchy fog and areas of low stratus across the Valley between 12-18z Mon with a 40-60% chance for MVFR/IFR CIGs at any given hour. However, high pressure aloft which has been compressing the moisture layer towards the surface will be progressing eastward by Monday morn...