I use www.wunderground.com
7 day forcast for everywhere I have been in the world and fantastic History & Almanac gives you previous 10 (I think) years weather.
It's good to know the UV strength we can expect each day and which area will be high or low on the map for the duration of our stay, very important to those of us who burn . We also use weather underground and accuweather and it can sometime helps to know the offshore forecasts too, and we keep an eye open for unusual ocean "hot spots" which can sometimes indicate storms.We're not obsessed but it helps to be prepared LOL