>>124524It can be quite humid and rain a lot. But the weather can also be nice, sunny and dry.
Check this site:
http://www.yr.no/place/Sweden/Norrbotten/Abisko/statistics.htmlIt is in English and will provide good weather forecasts, but also has a statistics section where you can seea verage weather and how the weather was at a particular time last year to get you an idea of the climate. Do note the elevation of the weather station compared to the elevation where you will be hiking. And remember that weather changes quickly in the mountains.