As a follow-up to my earlier answer - I did do an open house today - rained off and one - poured at one time. Had a terrific turn-out . 3 buyers to work with. You just never know.
Of course, if the homes main selling point are its expansive and exquisitely landscaped garden, or the home is fully carpeted it may not be such a good thing.
p.s. if it is owner occupied, I would probably reschedule. I would also re-schedule if the property is one month or more on the market.
Rain is so rare in here, but when it rains it pours:)
The last Open House that I hosted during a torrential downpour was in the Hollywood Hills and not one person came to visit. I noticed that rocks and small boulders were falling down the hillside on my way up the hill. By the time I finished, there were small mudslides and debris in the middle of the road. I think the decision to host or not depends on the location of the property. I have personally visited many Open Houses in rainy weather, it does not bother me.
I would never do an open house in this type of rain and it is rare for buyers to be out in this weather. However, I did get a call from someone who saw one of my listings online and then drove by and wanted to see it. I had a conflicting appointment so I referred him to another agent....he must be motivated!
It is about to rain here today and I will be doing my open house. Rain or shine if I have an open house scheduled I will do it. the results have been mixed - sometimes great turn outs on rainy Sundays and sometimes not so much.
As someone else mentioned - those who do show up in the rain are in the market to buy a house. Good luck.