It helps to have sheer white curtain to diffuse strong light, I have that with our windows here, and my windows face west. But I also have tinted windows and shade from city trees. so light gets diffused, still by 4pm to 6pm strong light, so the curtains help.
If it is raining all day long on your side, I think you can safely open your blinds. Just remember to close it a bit again if your weather improves.
