I'm not a poet at heart, but I shall give some non-expert opinions on this haiku anyway.

I think the poem is kinda like opposite to its title. The title is Rainfall but your poem is about a lack of rain, which is contradictory. I don't think that's supposed to be. It isn't very long, so there aren't any other mistakes to point out. Nice try!

It's likely contradictory for a reason. If it was titled something that suggested it was about lack of rain, like 'Drought' for instance, we'd know what was coming and it wouldn't have much of a impact. By calling it 'Rainfall' and describing a lack of rain, it makes you stop and notice the contradiction, and thus the poem occupies more time in your active memory and makes a more lasting impression - which is particularly important for such a short piece.

Ooooh...that's a nice trick then, Way.

Actually I hadn't meant it to be intentionally contradictory, but that is a good way of looking at it. Often, our mistakes are what others find the most interesting. Thank you both for your thoughts.