September
Weather in September
September in Seltjarnarnes embodies the onset of fall, a noticeable contrast to the summer warmth of August. The average sea temperature starts to retreat to a cooler 9.7°C (49.5°F) indicating the arrival of the fairly milder months. Length of daylight noticeably diminishes from August, reflecting the typical autumn--a shift as September progresses. Even though September ushers in a coolness signaling the start of fall, October's weather magnifies this change.
Note: In 9.7°C (49.5°F), cold shock and rapid breathing can occur when swimming at temperatures below 10°C (50°F).
On the first day of the month, sunrise is at 06:12 and sunset at 20:43. On the last day of September, in Seltjarnarnes, sunrise is at 07:35 and sunset at 18:59 GMT.
Sea temperature
In Seltjarnarnes, the average seawater temperature in September is 9.7°C (49.5°F).Note: In 9.7°C (49.5°F), cold shock and rapid breathing can occur when swimming at temperatures below 10°C (50°F).
Daylight
The average length of the day in September is 13h and 1min.On the first day of the month, sunrise is at 06:12 and sunset at 20:43. On the last day of September, in Seltjarnarnes, sunrise is at 07:35 and sunset at 18:59 GMT.
Updated: Feb 10, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the sea water temperature in September in Seltjarnarnes?
In September, the average sea temperature is 9.7°C (49.5°F). At temperatures below 10°C (50°F), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 13°C (55.4°F) is not comfortable.
What is the average length of the day in September in Seltjarnarnes?
The average day length in September in Seltjarnarnes, Iceland, is 13h and 1min.
What time are sunrise and sunset in September in Seltjarnarnes?
In September, on the first day of the month, sunrise is at 06:12 and sunset at 20:43. On the last day of the month, sunrise is at 07:35 and sunset at 18:59 GMT.
Average sea temperature in September
Seltjarnarnes, Iceland
- Average sea temperature in September: 9.7°C
The best months for swimming (with the highest average sea temperature) are July and August (11.3°C).
The coldest month (with the lowest average sea temperature) is March (4.3°C).
Average daylight in September
Seltjarnarnes, Iceland
- Average daylight in September: 13h and 0min
The month with the longest days is June (Average daylight: 20h and 54min).
The month with the shortest days is December (Average daylight: 4h and 24min).
