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Riverton Weather Forecast
| TODAY | TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT |
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| Patchy Fog | Fog | Mostly Cloudy | Patchy Fog | Patchy Fog | Patchy Fog | Patchy Fog | Partly Cloudy | Chance of Showers | Chance of Showers | Chance of Showers | Chance of Showers |
| Hi: 56°FHi: 13°C | Lo: 40°FLo: 4°C | Hi: 56°FHi: 13°C | Lo: 45°FLo: 7°C | Hi: 56°FHi: 13°C | Lo: 40°FLo: 4°C | Hi: 63°FHi: 17°C | Lo: 43°FLo: 6°C | Hi: 60°FHi: 16°C | Lo: 43°FLo: 6°C | Hi: 59°FHi: 15°C | Lo: 40°FLo: 4°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 236 AM PDT Sun Oct 18 2026 
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Issued: 843 AM PDT Sun Oct 18 2026
Aviation
... Westerly flow aloft today will shift southwesterly tonight into Monday as an upper trough digs southward well offshore. Light surface flow will turn northerly or weakly offshore today. Areas of LIFR fog and low clouds will dissipate by midday. Increasing high level moisture later today into tonight may limit areal coverage of low clouds on Monday morning with the exception of more fog prone locations in the Southwest Interior and south Puget Sound.
KSEA...LIFR fog and low clouds this ...