Verdict: Fair month
Reykjavík Weather in September
September is mild-to-cool in Reykjavík, topping out near 10°C (50°F) — comfortable with a layer on. It's also the wet side of the calendar: rain falls on about 17 days, so build flexibility into plans. September is workable in Reykjavík if your dates are fixed — just plan around the conditions.
Average high
10°C / 50°F
Average low
6°C / 43°F
Rain days
~17
Precipitation
140 mm
What to pack for Reykjavík in September
- A proper warm jacket, and a hat for mornings
- Rain gear is non-negotiable — expect rain on roughly 17 days
- Comfortable walking shoes — every guide on this site assumes you'll use them
September against the rest of the year
Warmest in Reykjavík: Jul (13°C / 55°F) · Coolest: Dec (1°C / 34°F) · Wettest: May (~20 rain days)
2°
-3°
Jan
2°
-2°
Feb
3°
-2°
Mar
6°
1°
Apr
9°
4°
May
11°
7°
Jun
13°
9°
Jul
13°
9°
Aug
10°
6°
Sep
6°
2°
Oct
4°
0°
Nov
1°
-3°
Dec
Daily highs / lows in °C · bars show rain days per month · ERA5 climate normals (2020–2024)