http://clubarnage.com/weather/ Has the fifteen day forecast. But personally I don;t hold much faith in weather forecasts. Two weeks ago they had torrential rain and until the day before the forecast had no mention of rain. Make teh Assumption it's going to rain and rain a lot. You can always leave the water proof in the Car. If you assume it's going to be bright and dry you can't exactly pop home for you water proofs can you.
t.