Frameless window frame leak

[Andy Smith]

Despite the title, I hope this makes sense.

In the passenger side window in my hallway, I noticed a slight dampness right at the lower left corner of the frameless window frame. It's not coming from the window sealing against the frame itself, but between the frame and the wall, or so it seems. It only happens when we get sideways rain, and have the awnings 100% in (I usually leave them 3 or 4 inches out to keep some of the rain from the sides).

Since it's still raining, I can't really check the top of the window outside, but was wondering if anyone had any advice to seal this a bit better? Is there any caulking up there? It's a really weird spot to try and see because from above it's under the awning, and below is slightly too high for my ladder. I don't think it's higher up because the rest of the wall seems fine and dry.