Weather Info
The advice on the front page of the site will be repeated here, since it is good advice:
Hiking in the Clackamas District is generally not like taking a walk in the Gorge or on Mount Hood. Our District is rough, steep, remote, and unforgiving. The trails are often faint, there are few signs, and help is far away. It’s wilder than wilderness. Don’t underestimate it. Be prepared. Cell phones cannot be relied upon.
DO NOT rely on internet trip planners to navigate the woods. DO NOT try to cross the District during the Winter, late Fall, or early Spring unless you know exactly what you are doing and have your Common Sense pulled up tight. Use Highway 26 or 22. That’s what they’re for.
All trail info pages have a button to display a 3 Day NWS Pinpoint Forecast for the trailhead – look for this button: 
Click any point on the map below for a detailed 3-day NWS pinpoint forecast.
Click a station marker to view recent observations from local weather and SNOTEL stations.
Clicking on a station in the map below will display recent observations
Display map with all weather and SNOTEL stations in Oregon
The map below was created by computer modeling, not actual observations, but has been shown to be reasonably accurate. Please do not rely on this data as the actual conditions you will run into, it should be more of a general idea of how much snow is on the ground.