Reykjavík Weather in September
With daytime temperatures of 12°C (54°F) and nighttime lows of 6°C (43°F), September in Reykjavík brings moderate temperatures during the day. Do keep in mind that quite a bit of rainfall is typical. Around 145 mm (5.7 in) falls on average.
Rainfall in Reykjavík in September
The climate data from previous years indicates about 18 days of rain, averaging 145 mm (5.7 in) for the month. Wet weather is a regular and significant part of this month. Frequent days of rain combined with high totals means proper waterproofs are worth packing.
Temperature in Reykjavík in September
If you're visiting Reykjavík in September, expect highs of 12°C (54°F) and overnight lows around 6°C (43°F). A light jacket or extra layer can be useful, especially outside the warmest hours of the day. Nights drop to 6°C (43°F). Cold nights like these are actually great for sleeping well, as long as you have a warm enough duvet.
Sunshine in Reykjavík in September
The area experiences a moderate amount of sunshine, with approximately 121 hours of sunlight expected. This means a decent mix of sun and overcast.
Wind Speed in Reykjavík in September
September has wind speeds averaging 5 m/s (10 knots). You can expect gentle to moderate winds that move small trees and make flags wave steadily on typical days. Conditions typically range from light breezes to moderate winds.
Average water temperature in September
At 10°C (50°F), the water is very cold. Most people find it too uncomfortable for anything beyond a brief wade.Our weather planner can help you find worldwide destinations with pleasant weather during this period. June and July typically offer the best weather for Reykjavík.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Iceland, check out our Reykjavík's climate page.
Reykjavík Temperature in September
Min Temperature
6°C (43°F)
Max Temperature
12°C (54°F)
Water Temperature
10°C (50°F)
Chance of Rain
60%
Precipitation
145 mm (5.7 in)
Rainy days
18 days
Humidity
79%
Windspeed
5 m/s (10 knots)
Sunshine
121 hours
Percentage Sunshine
30%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Reykjavík typically stay consistent throughout September, with daily highs averaging around 12°C (54°F). Nights are cold, with lows typically ranging from 4°C (39°F) to 8°C (46°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Reykjavík in September
Browse day-by-day weather records for Reykjavík spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Reykjavík historical weather extremes in September
Based on weather observations in Reykjavík between 1976 and 2025, these are the recorded extremes during September.
- On September 26, 2019, temperatures climbed to 18°C (64°F), marking the warmest September day on record.
- On September 23, 2005, Reykjavík saw its coldest September day with temperatures maxing out at 3°C (37°F).
- Nighttime temperatures dropped to -3°C (27°F) on September 25, 2005, marking the coldest September night on record.
- The heaviest September precipitation occurred on September 12, 2007, when 35 mm (1.4 in) of precipitation fell.
Best Places in Iceland in September
Find out more about the weather in Iceland and which places have the best travel conditions in this month. See all of Iceland in September →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Reykjavík in September
The weather can be unpredictable in September, so pack clothes you can easily mix and match. You could bring jeans, other long pants, and a few t-shirts. A light jacket or light sweater will be pleasant for the cooler moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. The water temperature sits at about 10°C (50°F), which is too chilly for most people to enjoy swimming. Leave the swimsuit at home unless you love cold water. Bring sunglasses since you'll have some sunny periods throughout the monthWhat To Do in Reykjavík in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Iceland, check out our Reykjavík's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Reykjavík climate overview or explore weather in Iceland.
