From 20 May to 24 Jul the sun barely dips below the horizon; highs sit around 12–14°C and Jul is the driest month (≈54mm). Late-night walks to Grótta lighthouse or Sun Voyager, and mountain hikes on Esja, run past midnight.

First Saturday after 18 Aug — Reykjavik Marathon in the morning, free concerts, open studios and street food across Laugavegur and Miðbær, capped by harbour fireworks. Mild 14°C highs but humidity near 83% and rain creeping back (≈73mm).

Four nights of indie and Icelandic acts across Harpa, Gamla Bíó and downtown bars in early November; dark days (5°C highs, ≈97mm rain) pair with aurora-hunt detours to Þingvellir or Grótta between venues.

Aurora hunts work best once nights are fully dark from late September; Grótta headland and Öskjuhlíð have low light pollution. Expect 3–8°C days dropping to freezing by Dec, with Oct the wettest month (≈115mm) — pack waterproofs, not just down.