Reykjavík weather in September
September in Reykjavík: cold, rainy, with clean air — a good time to visit.
#5 of 12 months in Reykjavík · #436 of 604 destinations to visit in September · comfort 69/100 (tier C)
Updated June 2026 · climate normals from ERA5 reanalysis
Reykjavík climate normals — September
| Daytime high | 11°C / 51°F | 🧥 cold |
|---|---|---|
| Nighttime low | 6°C / 43°F | |
| Feels like (high) | 8°C / 46°F | |
| Rainfall | 149 mm / 5.9 in | 🌧 rainy |
| Rainy days | 19 days | |
| Humidity | 84% | 💦 very humid |
| Dew point | 6°C / 43°F | |
| Sunshine | 6.9 h/day | |
| Daylight | 13 h | |
| Wind | 22 km/h / 14 mph | |
| Snowfall | 0.9 cm / 0.4 in | |
| Air quality (US AQI) | 32 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Reykjavík in September — FAQ
- Is September a good time to visit Reykjavík?
- September in Reykjavík: cold, rainy, with clean air — a good time to visit. It ranks #5 of 12 months for Reykjavík on SeasonMap's comfort score (69/100).
- What is the weather like in Reykjavík in September?
- In September, Reykjavík averages a daily high of 10.7°C and a low of 5.9°C, with about 149.1 mm of rain over roughly 18.6 rainy days.
- What is the air quality in Reykjavík in September?
- Reykjavík has a mean US Air Quality Index of about 32 in September.