National Weather Service Forecast for: Happy Valley OR
Issued by: National Weather Service Portland, OR
Updated: 1:45 am PST Dec 18, 2025
 
Overnight

Overnight: Rain, mainly after 2am. Low around 40. South southeast wind around 10 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Rain
 Thursday

Thursday: Rain. The rain could be heavy at times. High near 54. Breezy, with an east southeast wind 13 to 21 mph becoming south southwest in the afternoon. Winds could gust as high as 39 mph. Chance of precipitation is 100%. New precipitation amounts between 1 and 2 inches possible.
Heavy Rain
and Breezy
 Thursday
Night
Thursday Night: Rain, mainly before 2am. The rain could be heavy at times. Low around 40. Breezy, with a west southwest wind 15 to 20 mph decreasing to 9 to 14 mph after midnight. Winds could gust as high as 36 mph. Chance of precipitation is 100%. New precipitation amounts between 1 and 2 inches possible.
Heavy Rain
and Breezy
 Friday

Friday: Rain. Snow level 2300 feet. High near 45. South southwest wind 9 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.
Rain
 Friday
Night
Friday Night: Rain. Snow level 2500 feet. Low around 38. Breezy, with a south southwest wind 13 to 15 mph, with gusts as high as 22 mph. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.
Rain and
Breezy
 Saturday

Saturday: Rain, mainly before 4pm. High near 45. Chance of precipitation is 80%.
Rain
 Saturday
Night
Saturday Night: Rain likely, mainly after 10pm. Mostly cloudy, with a low around 38. Chance of precipitation is 60%.
Rain Likely
 Sunday

Sunday: Rain. Cloudy, with a high near 46.
Rain
 Sunday
Night
Sunday Night: Rain. Cloudy, with a low around 40.
Rain
Lo 40 °F Hi 54 °F Lo 40 °F Hi 45 °F Lo 38 °F Hi 45 °F Lo 38 °F Hi 46 °F Lo 40 °F

Flood Watch
Wind Advisory
 

Overnight
 
 Rain, mainly after 2am. Low around 40. South southeast wind around 10 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday
 
 Rain. The rain could be heavy at times. High near 54. Breezy, with an east southeast wind 13 to 21 mph becoming south southwest in the afternoon. Winds could gust as high as 39 mph. Chance of precipitation is 100%. New precipitation amounts between 1 and 2 inches possible.
Thursday Night
 
 Rain, mainly before 2am. The rain could be heavy at times. Low around 40. Breezy, with a west southwest wind 15 to 20 mph decreasing to 9 to 14 mph after midnight. Winds could gust as high as 36 mph. Chance of precipitation is 100%. New precipitation amounts between 1 and 2 inches possible.
Friday
 
 Rain. Snow level 2300 feet. High near 45. South southwest wind 9 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday Night
 
 Rain. Snow level 2500 feet. Low around 38. Breezy, with a south southwest wind 13 to 15 mph, with gusts as high as 22 mph. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.
Saturday
 
 Rain, mainly before 4pm. High near 45. Chance of precipitation is 80%.
Saturday Night
 
 Rain likely, mainly after 10pm. Mostly cloudy, with a low around 38. Chance of precipitation is 60%.
Sunday
 
 Rain. Cloudy, with a high near 46.
Sunday Night
 
 Rain. Cloudy, with a low around 40.
Monday
 
 Rain. Mostly cloudy, with a high near 45.
Monday Night
 
 Rain likely. Snow level 2700 feet. Mostly cloudy, with a low around 38.
Tuesday
 
 A chance of rain. Snow level 2500 feet. Partly sunny, with a high near 46.
Tuesday Night
 
 A chance of rain. Snow level 2600 feet. Mostly cloudy, with a low around 35.
Wednesday
 
 A chance of rain. Snow level 2500 feet. Mostly cloudy, with a high near 44.

 

Forecast from NOAA-NWS for Happy Valley OR.