Prepare for a Damp Start and Late-Night Flurries in the Rose City

Morning Commute: Misty Skies and Chilly Starts

Portland residents waking up this Monday, March 9, 2026, can expect a classic damp start to the work week. Early morning temperatures are hovering near 39°F with high humidity levels reaching 86%, creating a persistent mist across the Willamette Valley. For those heading out before 9:00 AM, light rain and drizzle are likely, though total accumulation is expected to remain under 1.0mm. While the precipitation is light, the damp pavement may cause minor slickness on major thoroughfares like I-5 and the Banfield Freeway.

Afternoon Outlook: Scattered Showers and Peak Temperatures

As we move into the afternoon hours, the mercury will struggle to climb, eventually reaching a projected high of 48°F. Between 12:00 PM and 3:00 PM, cloud cover may thin slightly, offering brief breaks in the overcast sky. However, the risk of scattered light showers remains significant, with the probability of rain peaking at approximately 45% by mid-afternoon. Winds will remain mild throughout the day, averaging 2 to 4 mph from the west, with occasional light gusts reaching up to 10 mph. The UV index for the day is rated as a 3 (Moderate), suggesting that while the sun is largely hidden, those spending extended time outdoors should still take standard precautions during any clearing periods.

Evening Transition: Cold Air and a Hint of Winter

The most notable shift in today's weather occurs after sunset, which is scheduled for 6:24 PM. As the evening progresses, temperatures will drop sharply from the low 40s into the mid-30s. By 9:00 PM, the temperature is expected to hit 37°F and continue falling toward an overnight low of 34°F. Forecasters are keeping a close watch on a 20% chance of snow flurries late tonight into early Tuesday morning. While significant accumulation is unlikely on valley floors, residents in the West Hills and higher elevations should be prepared for a light dusting as the rain transitions to a frozen mix overnight.

Monday Weather Summary

• High Temperature: 48°F (9°C)
• Low Temperature: 34°F (1°C)
• Precipitation: Light rain (45% chance) transitioning to possible snow flurries (20% chance) late night.
• Wind: Light westerly at 2-4 mph.
• Humidity: 66% average throughout the day.

Overall, today serves as a reminder of the volatility of early March in the Pacific Northwest. Stay bundled up and keep your rain gear handy, as the combination of moisture and dropping temperatures will make for a very brisk end to the day.