Very Low Pollen in Hillsboro, OR
Very low today, mostly weed pollen.
Last updated September 29, 2026
What to do today
- Pollen levels are very low right now. It's a great day to enjoy the outdoors!
Forecast
About pollen in Hillsboro
Pollen activity in Hillsboro remains quiet today. Weed pollen is present but at a very low level, meaning most people should be able to go about their day without much irritation, even those who tend to be sensitive this time of year. Looking ahead, the next several days should bring more of the same, with weed pollen holding steady at a low level through the week. This fits the seasonal pattern for late September, as the region moves past the more intense grass and tree pollen months. Local trees such as alder and birch typically release their pollen in spring, so their contribution is minimal now, leaving weeds like ragweed as the main source of any lingering pollen through early fall.
Common questions
- What is the pollen count in Hillsboro, OR today?
- Hillsboro, OR is at a very low 1 out of 5 on the Universal Pollen Index today, driven mainly by weed pollen. The five-day outlook holds steady around 1 of 5.
- Is weed pollen high in Hillsboro, OR right now?
- Weed pollen is very low today at 1 of 5, and it's past its peak season. Most people won't notice it.