In my experience you really need to watch the forecast regularly during the week before you go to see how the picture is changing as it is really only reliable within a few days. If the picture is relatively stable as with a large anticyclone then it should be reliable, but if it is changing daily then anything could happen.
MetService tend to overstate the weather in my experience in that they will say it is going to rain all day when in reality there are only showers for part of the day.
yr.no gives reasonably good forecasts but again look regularly to see how it is changing.
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