Blue Lagoon Weather in September
Thinking of visiting Blue Lagoon in September? Expect low temperatures reaching 12°C (54°F) during the day, dropping to 8°C (46°F) at night, and be prepared for the wettest month of the year.
Rainfall in Blue Lagoon in September
Expect frequent showers this month, so make sure to have an umbrella to keep yourself dry. Typically around 18 days of rainfall are expected, averaging 149 mm (5.9 in) for the month. Expect frequent rainfall this month, and not just light drizzle. When it rains, it tends to come down hard.
Temperature in Blue Lagoon in September
September in Blue Lagoon sees highs of 12°C (54°F) and lows of 8°C (46°F) overnight. The days stay cool from start to finish. Layering up well will make outdoor time much more comfortable. With lows around 8°C (46°F), nights are cold. The upside is that cool, crisp nights are often the best for a deep sleep.
Sunshine in Blue Lagoon in September
You can expect a moderate amount of sunlight, with approximately 121 hours. This means a pleasant mix of sun and overcast.If you're looking for dry conditions and comfortable temperatures, September may not be the ideal month to visit Blue Lagoon. Our weather planner can help you explore destinations with more pleasant weather conditions.
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 Blue Lagoon's climate page.
Blue Lagoon Temperature in September
Min Temperature
8°C (46°F)
Max Temperature
12°C (54°F)
Chance of Rain
61%
Precipitation
149 mm (5.9 in)
Rainy days
18 days
Humidity
79% *
Sunshine
121 hours *
Percentage Sunshine
30% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Blue Lagoon typically stay consistent throughout September, with daily highs averaging around 12°C (54°F). Nights are cold, with lows typically ranging from 5°C (41°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 Blue Lagoon in September
Browse day-by-day weather records for Blue Lagoon spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Blue Lagoon historical weather extremes in September
Based on 49 years of weather observations (1976-2025), these are the most extreme conditions recorded in Blue Lagoon.
- Blue Lagoon recorded its highest September temperature of 17°C (63°F) on September 2, 2008.
- The coldest September day was on September 30, 1981, with a maximum of 3°C (37°F).
- Nighttime temperatures dropped to -2°C (28°F) on September 25, 2020, marking the coldest September night on record.
- The wettest September day on record brought 38 mm (1.5 in) of precipitation to Blue Lagoon (September 9, 2022).
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 Blue Lagoon in September
The weather can swing between comfortable and chilly in September, so flexibility is key. Pack a variety of tops, at least one warm layer, and both shorts and long pants. This gives you options no matter what the day brings. Expect heavy rainfall, so bring good rain protection and waterproof bags. Bring sunglasses since you'll have some sunny periods throughout the monthWhat To Do in Blue Lagoon 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 Blue Lagoon's climate page.
Temperature Rainfall Sunshine Humidity
See the full Blue Lagoon climate overview or explore weather in Iceland.
