August weather forecast
Grindavik, Iceland

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August

Weather in August

August continues Grindavik's mild summer trend, with temperatures slightly dropping from July's highs. This change paves the way for a series of cultural festivals and events that dot the city's calendar at this time of year. As the month progresses, the Northern Lights gradually begin to make their return, delighting both locals and tourists with their magical performances. The blend of extended daylight hours, warm weather, and vibrant social events makes August an opportune time for visiting Grindavik. Despite the unseasonably warm daytime temperatures, evenings can still require a sweater or light jacket.

Temperature

Grindavik experiences peak temperatures, averaging a high-temperature of 12.2°C (54°F) during July and August.

Humidity

July and August, with an average relative humidity of 81%, are the most humid months.

Rainfall

In August, the rain falls for 14.5 days. Throughout August, 59mm (2.32") of precipitation is accumulated. Throughout the year, there are 193.9 rainfall days, and 833mm (32.8") of precipitation is accumulated.

Snowfall

June through September are months without snowfall in Grindavik.

Sea temperature

In August, the average sea temperature in Grindavik is 11.5°C (52.7°F).
Note: Caution: 11.5°C (52.7°F) temperatures below 10°C (50°F) during swimming can result in intense cold shock and quickened breathing.

Daylight

In Grindavik, Iceland, the average length of the day in August is 16h and 15min.
On the first day of August in Grindavik, Iceland, sunrise is at 04:41 and sunset at 22:30. On the last day of the month, sunrise is at 06:12 and sunset at 20:47 GMT.

Sunshine

The month with the most sunshine is August, with an average of 7.6h of sunshine.

UV index

The average daily maximum UV index in August is 3. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: In August, the maximum UV index of 3 suggests this advice:
Ensure safety - Imperative it is to shield skin and eyes from damage. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades.
Updated: Feb 10, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What part of the year is the hottest in Grindavik?
July and August are identified as the warmest months in Grindavik, Iceland, with an average high-temperature of 12.2°C (54°F).
What is the usual temperature for Grindavik in August?
In Grindavik, in August, the average high-temperature is 12.2°C (54°F), and the average low-temperature is 9.8°C (49.6°F).
What is the most humid month in Grindavik?
July and August, with an average relative humidity of 81%, are most humid months in Grindavik.
What is the average humidity in August in Grindavik?
In Grindavik, Iceland, the average relative humidity in August is 81%.
How many days does it rain in August in Grindavik?
In August, in Grindavik, Iceland, the rain falls for 14.5 days. Throughout August, 59mm (2.32") of precipitation is accumulated.
When it does not snow in Grindavik?
June through September are months without snowfall.
How cold is the water in August in Grindavik?
In Grindavik, Iceland, the average seawater temperature in August is 11.5°C (52.7°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.
How many hours of daylight does Grindavik have in August?
In August, the average day length is 16h and 15min.
When is the sunrise / sunset in August in Grindavik?
In August, on the first day of the month, sunrise is at 04:41 and sunset at 22:30. On the last day of the month, in Grindavik, Iceland, sunrise is at 06:12 and sunset at 20:47 GMT.
What month has the most sunshine in Grindavik?
With an average of 7.6h of sunshine, August has the most sunshine of the year.
How long on average sun shines in August in Grindavik?
In August, the average sunshine duration is 7.6h.
How high is the UV index in August in Grindavik?
The average daily maximum UV index in August in Grindavik is 3. A UV Index estimate of 3 to 5 represents a medium health risk from unprotected exposure to UV radiation.
Today
Tomorrow
Long-term
YearJFMAMJJAugustSOND
Jul
August
Sep
Average high temperature
12.2°C
12.2°C
10.3°C
Average low temperature
9.9°C
9.8°C
8.4°C
Average pressure
1009.4mbar
1007.6mbar
1002.6mbar
Average wind speed
20.3km/h
22.4km/h
27.9km/h
Average max. wind speed
21.6km/h
23.7km/h
28.9km/h
Average wind speed gusts
30km/h
32.6km/h
40.2km/h
Average humidity
81%
81%
79%
Average rainfall
46mm
59mm
86mm
Average rainfall days
14.8
14.5
19.9
Average snowfall
0mm
0mm
0mm
Average snowfall days
0
0
0
Average sea temperature
11.7°C
11.5°C
10.1°C
Average daylight
19h 2min
16h 2min
13h 0min
Average sunshine
7h 3min
7h 4min
4h 5min
Average sunshine days
14.7
14.7
8.5
Average UV index
4
3
3
Average cloud cover
60%
60%
63%
Average visibility
9km
10km
9km
Average temperature in August
Grindavik, Iceland
  • Average high temperature in August: 12.2°C

The warmest months (with the highest average high temperature) are July and August (12.2°C).
The months with the lowest average high temperature are February, March and December (4.2°C).

  • Average low temperature in August: 9.8°C

The month with the highest average low temperature is July (9.9°C).
The coldest months (with the lowest average low temperature) are March and December (1.3°C).

Average pressure in August
Grindavik, Iceland
  • Average pressure in August: 1007.6mbar

The month with the highest atmospheric pressure is June (1013.7mbar).
The month with the lowest atmospheric pressure is January (996.1mbar).

Average wind speed in August
Grindavik, Iceland
  • Average wind speed in August: 22.4km/h

The windiest month (with the highest average wind speed) is February (35km/h).
The calmest month (with the lowest average wind speed) is June (20.1km/h).

Average humidity in August
Grindavik, Iceland
  • Average humidity in August: 81%

The months with the highest relative humidity are July and August (81%).
The month with the lowest relative humidity is December (74%).

Average rainfall in August
Grindavik, Iceland
  • Average rainfall in August: 59mm

The wettest month (with the highest rainfall) is January (99mm).
The driest month (with the least rainfall) is June (35mm).

Average rainfall days in August
Grindavik, Iceland
  • Average rainfall days in August: 14.5 days

The month with the highest number of rainy days is September (19.9 days).
The month with the least rainy days is June (12.5 days).

Average snowfall in August
Grindavik, Iceland
  • Average snowfall in August: 0mm

The month with the highest snowfall is March (75mm).
The months with the least snowfall are June, July, August and September (0mm).

Average snowfall days in August
Grindavik, Iceland
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is March (8 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average sea temperature in August
Grindavik, Iceland
  • Average sea temperature in August: 11.5°C

The best month for swimming (with the highest average sea temperature) is July (11.7°C).
The coldest month (with the lowest average sea temperature) is March (5.8°C).

Average daylight in August /
Average sunshine in August
Grindavik, Iceland
  • Average daylight in August: 16h and 2min

The month with the longest days is June (Average daylight: 20h and 36min).
The month with the shortest days is December (Average daylight: 4h and 30min).

  • Average sunshine in August: 7h and 4min

The month with the most sunshine is August (Average sunshine: 7h and 36min).
The month with the least sunshine is January (Average sunshine: 2h and 18min).

Average sunshine days in August
Grindavik, Iceland
  • Average sunshine days in August: 14.7 days

The month with the most sunshine days is June (15 days).
The months with the least sunshine days are March and April (7.1 days).

Average UV index in August
Grindavik, Iceland
  • Average UV index in August: 3

The month with the highest UV index is July (UV index 4).
The months with the lowest UV index are January, February, March, April, May, October, November and December (UV index 2).

Average cloud cover in August
Grindavik, Iceland
  • Average cloud cover in August: 60

The month with the most cloud cover is March (Cloud cover 69).
The months with the least cloud cover are May, July and August (Cloud cover 60).

Average visibility in August
Grindavik, Iceland
  • Average visibility in August: 10km

The months with the highest visibility are June and August (10km).
The months with the lowest visibility are January, February, March, April, May, July, September, October, November and December (9km).

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