Summers are generally considered great for visiting Westman Islands. In August or September, there are chances that you can spot and click baby puffins. The days are long and chilly, so the scope to travel for a longer duration increases.  But note that on the first weekend of August, Westman Islands holds the largest festival of the year in Iceland, called Þjóðhátið. People from all over Iceland travel to the islands for a music festival and party all night long. It is a great experience if you are up for the fun, but tickets are usually sold out months in advance. Although you can visit here throughout the year, precautions are to be taken for winters. If you want to see snowfall, then winters are good for you. Since there are almost all the cliffs and mountain ranges around the area get covered with snow during winters. Packing a thick jacket and boots with a good grip is mandatory in any season. Even summers can get quite chilly in Iceland. They would keep you warm and help in conquering long walking distances on uneven grounds. Do follow weather forecasts consistently. Winters in Iceland can be bad as some frequent snowstorms and tides can be dangerous. Keep enough supplies with you of energizing snacks and water as long distances might drain your energy.