Weather Alerts For South Lake Oswego, OR

Pollen Index: 9.2 Pollen Level: medium-high Predominant Pollen: Alder, Cedar/Juniper and Birch. The amount of pollen in the air for Wednesday will be falling into the very low range. This decrease is due to falling temperatures, rising humidity and heavy rains in the morning and evening which tend to wash pollen out of the air.