Dec. 18, 2025 was the wettest such day on record

Portland recorded 2.1 inches of rain on Dec. 18, 2025 — more than any other Dec. 18 in the historical record. The long-term average rainfall for Dec. 18 is 0.18 inches. Portland’s all-time 24-hour rainfall record is 4.44 inches, set on Oct. 27, 1994.