Snæfellsnes is accessible year-round, though the experience changes dramatically by season. Summer (June–August) brings long daylight hours — the midnight sun in June means you can hike the peninsula at any hour — good road access, and the peak of birdlife along the cliffs. It is also the busiest period, with tourist numbers having increased substantially since the peninsula gained international recognition.
The shoulder seasons (May and September) offer a good balance: reasonable weather, fewer visitors, and dramatic skies. October and November are genuinely autumnal — stormy, atmospheric, and relatively crowd-free; the aurora borealis becomes visible on clear nights. Winter (December–March) brings possible road closures in bad weather and short days, but the peninsula can be exceptional in snow and the orca whale-watching from Grundarfjörður peaks when herring shoals are in the fjords. The glacier is more dramatic in winter but glacier tours are weather-dependent. The Ring Road connection from Reykjavik to Snæfellsnes is well-maintained year-round; the smaller peninsula roads require a cautious approach in icy conditions.