weather in oslo in may
Oslo Weather in May 2018. Oslo in May. Oslo weather in May is pretty cold, especially at night time, with temperatures of 7Â° and 17Â° degrees, so don't forget to pack warm clothes with you. As there are on average 14 days of rain in Oslo in May, it is most recommended to walk around with umbrella and keep on update regarding the weather before outdoor activity. Also, please note that Oslo in May might get some snow.