Iceland's climate is tempered by the Gulf Stream. Summers are mild and winters rather cold. The colourful Aurora Borealis (Northern Lights) appear from the end of August. From the end of May to the beginning of August, there are nearly 24 hours of daylight in Reykjavík, while in the northern part of the country the sun barely sets at all.

Winds can be strong and gusty at times and there is the occasional dust storm in the interior. Snow is not as common as the name of the country would seem to suggest and, in any case, does not lie for long in Reykjavík; it is only in northern Iceland that skiing conditions are reasonably certain. However, the weather is very changeable at all times of the year, and in Reykjavík there may be rain, sunshine, drizzle and snow in the same day. The air is clean and free of pollution.

Lightweights in warmer months, with extra woollens for walking and the cooler evenings. Medium- to heavyweights are advised in winter. Waterproofing is recommended throughout the year.