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City of St. Helens, ORSt. Helens, OR Weather Forecast
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St. Helens Weather Forecast
| TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY |
 |  |  |  |  | |  | | |  | | |
| Mostly Clear | Mostly Sunny | Mostly Cloudy | Chance of Rain | Chance of Rain | Mostly Sunny | Partly Cloudy | Mostly Sunny | Partly Cloudy | Partly Sunny | Partly Cloudy | Mostly Sunny |
| Lo: 49°FLo: 9°C | Hi: 71°FHi: 22°C | Lo: 51°FLo: 11°C | Hi: 65°FHi: 18°C | Lo: 51°FLo: 11°C | Hi: 69°FHi: 21°C | Lo: 50°FLo: 10°C | Hi: 75°FHi: 24°C | Lo: 51°FLo: 11°C | Hi: 71°FHi: 22°C | Lo: 51°FLo: 11°C | Hi: 71°FHi: 22°C |
| POP: 50% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 502 PM PDT Sun Sep 27 2026 
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Issued: 209 PM PDT Sun Sep 27 2026
Discussion
...Now through Saturday...High pressure remains in control across the region this afternoon, maintaining generally quiet weather through Monday. A weak upper-level low is settling southward toward California while low-level flow gradually shifts from weak offshore flow today toward a light onshore component Monday. Temperatures will remain seasonably cool, with inland valley highs generally in the upper 60s to possibly 70 on Monday.
Clear skies and light winds tonight will again promote...