Rain also threatens awnings.
All awnings are designed to pitch one way or the other so as to dump water so it doesn't pile up on the awning. A properly setup awning can handle all the rain you throw at it.
PUP awnings have the little push-buttons (or similar adjustments in the "vertical" (or diagonal) legs. This allows one to be longer than the other and dump water. Boondocking on uneven ground required me to add extra holes to the leg farther from the PUP door so I could get the desire pitch.
(PS, the best setup on a PUP awning is to position the legs vertically...and not attach them to the sidewall of the tub. Vertical positioning enables you to use paracord or light rope to large ground stakes and solidly secure the awning. Most legs also have D-rings for ground stakes. This makes for a very sturdy setup.)
Back to rain:
Manual hard-side awnings often have large levers on the main struts, and some combination of adjustments on the main and auxiliary struts allows the awning to be pitched to dump water.
Electric awnings normally have very simple to adjust pitch angle. Mine has a "knee-action" minor strut that you just pull down to get about 6 to 10 inches of "left-to-right" pitch on the awning.
If you pitch the awning as soon as you deploy it, you won't forget, and it will not collect rain.
However: In CO, we get hail often. And over Memorial Day weekend, we got about 2" of heavy, wet snow. No amount of pitch will deal with either of those!!