It's been raining the past few afternoons! When is it going to end? It's May already for christ's sake... Wanna go photograph also must be wary of the weather at this time of the month...;(
But seriously though, there are periods where you can still shoot, of course not everyone is as free as me to grab the chance of those periods.
If you -do- have something planned, and it's raining, my suggestion is to just go ahead and whack your plans. There is a possibility, no matter how slim, that the rain will clear the skies will open and all your photographic efforts will be rewarded. Of course, not 100%, but that's a risk we all have to take in such weather, I guess.