SeasonMapIlulissat (Disko Bay) weather in September
Greenland
September in Ilulissat: cold, a little rain, with clean air — a good time to visit.
#5 of 12 months in Ilulissat · #1058 of 1383 destinations to visit in September · comfort 63/100 (tier C)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Ilulissat in September
Other months in Ilulissat
Ilulissat's forum flags July for the midnight sun — it doesn't fully set from mid-May into late July — and for mosquitoes, which regulars say are genuinely present through June, July and August. Boat-trip veterans recommend a windproof layer even on a mild-looking day, since the wind off the water cuts the temperature noticeably.
Add your own note from Ilulissat's card on the map.
Ilulissat climate normals — September
| Daytime high | 5°C / 41°F | 🧥 cold |
|---|---|---|
| Nighttime low | -1°C / 31°F | |
| Feels like (high) | 2°C / 36°F | |
| Sea temperature | 5°C / 40°F | 🥶 cold sea |
| Rainfall | 46 mm / 1.8 in | 🌦 some rain |
| Rainy days | 8 days | |
| Humidity | 74% | 💧 humid |
| Dew point | -3°C / 26°F | |
| Sunshine | 7.8 h/day | |
| Daylight | 13.3 h | |
| Wind | 13 km/h / 8 mph | |
| Snowfall | 7.3 cm / 2.9 in | |
| Air quality (US AQI) | 29 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Ilulissat in September
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
Shoulder seasonschool holidays in 3 of the markets that fill it, an ordinary month(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Ilulissat's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Fair weatherIlulissat's weather peaks June–August, best around July.
Best weatherFair weatherToughest weather
What's on in Ilulissat in September
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Nature
Whales in Disko Bay
1 Jun – 30 Sep · usuallyWhale seasonHumpbacks, minke and fin whales feed in the bay through the open-water months, with July and August the reliable weeks. They surface between icebergs, which is the part the photographs never explain.
- Season
Icefjord boat season
1 Jun – 30 Sep · usuallyIceberg seasonThe bay is open water in summer, so the boats out to the mouth of the icefjord run daily and the kayaks go out. The ice itself is there all year; getting on the water to it is not.
- Nature
Aurora season
15 Sep – 10 Apr · usuallyThe lights come back with the dark in late September and stay until the sun does in April. Clear nights in Disko Bay are the constraint, not the latitude.
Where is Ilulissat?
Ilulissat in September — FAQ
- Is September a good time to visit Ilulissat?
- September in Ilulissat: cold, a little rain, with clean air — a good time to visit. It ranks #5 of 12 months for Ilulissat on SeasonMap's comfort score (63/100).
- What is the weather like in Ilulissat in September?
- In September, Ilulissat averages a daily high of 4.9°C and a low of -0.7°C, with about 45.5 mm of rain over roughly 8.1 rainy days.
- What is the air quality in Ilulissat in September?
- Ilulissat has a mean US Air Quality Index of about 29 in September.
- Does it snow in Ilulissat in September?
- Ilulissat sees roughly 7.3 cm of snowfall in September.