Best time to visit Oslo: month-by-month weather (2026)

June, July, and August stand out as the best months to visit, based on the highest visit scores of the year. Daytime highs reach into the high teens and low 20s Celsius, sunshine hours peak between roughly 10 and 14 hours a day, and these three months are also marked as the peak season for tourism.

That same peak period brings trade-offs: July is both one of the warmest months, with highs around 20.8C, and the wettest, with about 157mm of rain, more than any other month of the year. Travelers who prefer lower costs and fewer crowds can look instead to the off season of January, November, and December, though this means colder temperatures and far less daylight, with sunshine dropping to under three hours a day in each of those months.