Grindavík Weather in September
September in Grindavík sees daytime temperatures around 12°C (54°F) and lows of 8°C (46°F) at night. As the wettest month of the year, keep in mind that rainfall is at its highest.
Rainfall in Grindavík in September
Since this month has the highest rainfall, keep an umbrella with you to handle sudden showers. Past climate data indicates that roughly 18 days will see rain, totalling around 150 mm (5.9 in) for the month. This month brings frequent, heavy showers. Both the number of wet days and the rainfall totals are on the high side.
Temperature in Grindavík in September
Daytime temperatures in Grindavík reach 12°C (54°F) in September, dropping to 8°C (46°F) at night. Expect a cold feel throughout the day, not just in the mornings and evenings. Warm layers are essential. 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 Grindavík 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.If you prefer dry days with pleasant temperatures, September may not be the ideal month to visit Grindavík. 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 Grindavík's climate page.
Grindavík Temperature in September
Min Temperature
8°C (46°F)
Max Temperature
12°C (54°F)
Chance of Rain
61%
Precipitation
150 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 Grindavík 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 Grindavík in September
Browse day-by-day weather records for Grindavík spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Grindavík historical weather extremes in September
Based on weather observations in Grindavík between 1976 and 2025, these are the recorded extremes during September.
- The hottest September day on record in Grindavík reached 17°C (63°F) (September 2, 2008).
- The coldest September day was on September 30, 1981, with a maximum of 3°C (37°F).
- Grindavík registered its coldest September night on September 25, 2020, with temperatures dropping to -2°C (28°F).
- The wettest September day on record brought 36 mm (1.4 in) of precipitation to Grindavík (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 Grindavík 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. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in Grindavík 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 Grindavík's climate page.
Temperature Rainfall Sunshine Humidity
See the full Grindavík climate overview or explore weather in Iceland.
