Is there a website for accurate Iceland weather forecast?
If "accurate" is taken into account, then I guess the answer is no, lol 😂 😂 😂
I have found this site, from Norway, to be useful in getting a general "feel" for what to expect from the weather.
Perhaps I find it useful because of the way the forecast is presented, as opposed to other sites.
But, as I'm sure you have read, the weather can abruptly change in Iceland, and change back just as quickly.
So, while it is nice to know what to expect, be prepared for anything.
Just don't trust any weather forecast more than 48-24 hours ahead of time and always keep checking again before you leave for the day.