http://www.qwikcast.com/cgi-bin/forecast.cgi?zip=San%20Ignacio,BZ
remember that showers here could be just 10-15 minutes every day or none at all or for hours in the evening...so don't expect the "showers" for everyday next week all day.
My first trip to Belize it was predicted to rain and storm all week. I saw 5 minutes of rain one afternoon in my 7 day trip!