Iceland · Month comparison
September vs May
September ranks #1 overall vs May at #2. Aurora returns, autumn colours explode, crowds drop — the most atmospheric month in Iceland.
September
#1 of 12 months
Best match
Aurora returns, autumn colours explode, crowds drop — the most atmospheric month in Iceland.
- ↑Aurora borealis returns from early September as nights grow long enough — first sightings of the new season
- ↑Autumn colours (yellows, reds, oranges across the highlands) peak in September — uniquely photogenic landscapes
May
#2 of 12 months
Best match
The green sweet spot — lupine fields starting, near-midnight sun, pre-tourist-peak prices.
- ↑Nootka lupine fields beginning to bloom across the south (peak in June): purple carpets against volcanic black sand
- ↑Near-midnight sun by late May: 20+ hours of light without peak July crowds or prices
| Factor | September | May |
|---|---|---|
| Weather score | 6 | 6 |
| Value score | 6 | 7 |
| Crowd score | 7 | 7 |
| Events score | 7 | 6 |
| Atmosphere | 9 | 7 |
| Avg high temp | 10°C | 10°C |
| Monthly rain | 67mm | 44mm |
| Daily sunshine | 8.5hrs | 11.5hrs |
September trade-offs
- ↓Temperatures drop quickly (10°C high); warm layers essential and weather windows shorter
- ↓Highland F-roads closing progressively through September — some interior routes blocked by late month
- ↓Aurora is back but not yet at winter frequency — nights still shorter than January–March
May trade-offs
- ↓F-roads (highland interior) not yet opened by the road authority — Landmannalaugar inaccessible
- ↓Temperatures still cool (10°C high) — not a beach destination in any sense
- ↓Some tourist infrastructure still on reduced winter schedules in early May
Scores compare months within Iceland. Climate data: Open Meteo ERA5 30-year normals (1991–2020). Methodology →