Reykjavík in September
In September, Reykjavík averages 10°C (50°F) during the day and 6°C (43°F) at night, with around 11 days of rain (70 mm total).
ShoulderConditions are cool — bring a jacket for evenings. Plan for unsettled weather and bring rain gear.
September in Reykjavík is outside the typical sweet spot for sightseeing weather. It can still be a great time to visit if you have specific reasons (festivals, off-season pricing, etc.).
How September compares to the rest of the year in Reykjavík
September is in the middle of the year for warmth in Reykjavík (4th of 12) and moderately rainy compared to the rest of the year (9th of 12). Daytime temperature runs 3°C above the annual average (7°C). September runs 3°C cooler than August (13°C) and cools 3°C in October (7°C).
September sunrise & sunset in Reykjavík
Times shown for Reykjavík local time (Atlantic/Reykjavik), calculated for the 15th of September. They shift by a few minutes day to day across the month.
Photography light in Reykjavík — September
Golden-hour and blue-hour windows for the 15th of September, in Reykjavík's local time. Use these for soft warm light (golden) or cool architectural twilight (blue).
📅 When to book — Reykjavík in September
Travel writers usually only tell you when to go. Here's when to book flights and lodging for the best mix of price and availability, based on September's tier (Shoulder) and Reykjavík's popularity.
Crowds & pricing — September in Reykjavík
Reykjavík is in a shoulder season month — fewer crowds, slightly lower prices, and a calmer atmosphere than peak weeks. Most major sights stay open with normal hours, though a handful of seasonal restaurants or boat trips may run reduced schedules. Many regulars consider these months the best time to visit because you trade a small amount of weather reliability for a much more pleasant on-the-ground experience.
Sun & mosquito risk — September in Reykjavík
UV is a clear-sky sea-level estimate — clouds, altitude, and reflective surfaces (snow, water) shift it ±30%. Mosquito risk is climate-derived only; for current disease advisories (dengue, malaria, zika) check the CDC or WHO travel pages before your trip.
Sea temperature in Reykjavík — September
Across the year Reykjavík's sea swings from 1.9°C (January) to 12.4°C (August) — September sits at 10.3°C.
Reykjavík in other months
| Month | Avg high | Avg low | Rainfall | Rain days | Snow days |
|---|---|---|---|---|---|
| January | 2°C / 36°F | -2°C / 28°F | 75 mm | 14 | 8 |
| February | 3°C / 37°F | -2°C / 28°F | 70 mm | 13 | 7 |
| March | 4°C / 39°F | -1°C / 30°F | 80 mm | 13 | 6 |
| April | 6°C / 43°F | 1°C / 34°F | 60 mm | 12 | 3 |
| May | 9°C / 48°F | 4°C / 39°F | 45 mm | 10 | 1 |
| June | 12°C / 54°F | 7°C / 45°F | 55 mm | 10 | 0 |
| July | 14°C / 57°F | 9°C / 48°F | 50 mm | 10 | 0 |
| August | 13°C / 55°F | 9°C / 48°F | 60 mm | 11 | 0 |
| September | 10°C / 50°F | 6°C / 43°F | 70 mm | 11 | 0 |
| October | 7°C / 45°F | 3°C / 37°F | 95 mm | 14 | 1 |
| November | 4°C / 39°F | 0°C / 32°F | 80 mm | 13 | 4 |
| December | 3°C / 37°F | -1°C / 30°F | 80 mm | 14 | 7 |
Other cities with similar September weather
🌍 See the full ranked list of climate twins for Reykjavík in September →
Frequently asked questions
How hot is Reykjavík in September?
In September, Reykjavík averages a high of 10°C (50°F) and a low of 6°C (43°F) — generally cool.
Does it rain a lot in Reykjavík in September?
September can be fairly wet in Reykjavík, with about 11 rainy days on average.
Is September a good time to visit Reykjavík?
September is cool. It suits travelers who are comfortable with cool weather; check the month-by-month ranking to compare it against the rest of the year.
What should I pack for Reykjavík in September?
Pack a warm jacket and layers, plus a compact umbrella or rain jacket. See the full September packing list for Reykjavík for a complete, climate-based checklist.
Check the live 10-day forecast and sunrise/sunset.