Alesund can be said to have a temperate and moderated oceanic climate. The winters here are damp, windy and mild in temperature. In the summers too the temperature remains cool and pleasant and the drop is not big.
Winters: The weather is quite cold from November to mid-April and there is constant rainfall during this period.
Summer: From April end to October the weather becomes quite pleasant. The temperature is quite cool but in the months of September to October there is heavy rainfall which announces the coming winters.
The best time to visit Alesund would be during the summer months of April to August. The weather is cool and pleasant during this period and there is very less rainfall during this time. All these conditions make these months perfect to be visited at this time.