May weather forecast
Grindavik, Iceland

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Weather in May

May ushers in the pleasant spring season in Grindavik, providing a welcome break from the bone-chilling winter months. This dramatic change in weather conditions ceases snowfall entirely, heralding teeming life into the previously frozen landscape. Hiking trails become more accessible, revealing the vibrant greenery of the moss-covered lava fields. Outdoor activities become more enjoyable due to the negligible snowfall, including a visit to the geothermal spas. Grindavik weather in May presents a delightful time for exploration, with the calm conditions enhancing the picturesque ambience of the city.

Temperature

As Grindavik welcomes May, the average high-temperature stabilizes at a chilly 7.8°C (46°F), showing little deviation from April's 5.7°C (42.3°F). Throughout May, Grindavik reports a steady low-temperature average of 5.1°C (41.2°F), slightly lower than its daytime counterpart.

Humidity

In May, the average relative humidity in Grindavik is 77%.

Rainfall

In Grindavik, during May, the rain falls for 16.4 days and regularly aggregates up to 58mm (2.28") of precipitation. Throughout the year, there are 193.9 rainfall days, and 833mm (32.8") of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, October through December. May is the last month it regularly snows in Grindavik. During 0.3 snowfall days, in May, Grindavik aggregates 2mm (0.08") of snow. Throughout the year, there are 33.4 snowfall days, and 297mm (11.69") of snow is accumulated.

Sea temperature

In May, the average sea temperature is 7.6°C (45.7°F).
Note: Dipping in 7.6°C (45.7°F) at temperatures less than 10°C (50°F) without proper gear can lead to pronounced cold shock and breathing difficulties.

Daylight

In May, the average length of the day is 18h and 23min.
On the first day of the month, sunrise is at 05:01 and sunset at 21:52. On the last day of May, sunrise is at 03:30 and sunset at 23:24 GMT.

Sunshine

The average sunshine in May in Grindavik is 7.4h.

UV index

The months with the lowest UV index are January through May, October through December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health hazard from unsafe exposure to UV radiation for average individuals.
Note: In May, the maximum UV index of 2 translates into these guidelines:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Remember this! The UV radiation of the Sun can be nearly doubled by the reflective properties of snow.

Frequently asked questions

What is the usual temperature for Grindavik in May?

Grindavik in May has an average high-temperature of 7.8°C (46°F) and an average low-temperature of 5.1°C (41.2°F).

What is the average humidity in May in Grindavik?

The average relative humidity in May is 77%.

How many days does it rain in May in Grindavik?

In Grindavik, Iceland, in May, it is raining for 16.4 days, with typically 58mm (2.28") of accumulated precipitation.

What is the last month it snows in Grindavik?

May is the last month it regularly snows in Grindavik, Iceland. During 0.3 snowfall days, in May, Grindavik aggregates 2mm (0.08") of snow.

What is the water temperature in May in Grindavik?

In Grindavik, in May, the average water temperature is 7.6°C (45.7°F). Swimming in 7.6°C (45.7°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique.

How many hours of daylight does Grindavik have in May?

The average day length in May in Grindavik, Iceland, is 18h and 23min.

When is the sunrise / sunset in May in Grindavik?

On the first day of May, sunrise is at 05:01 and sunset at 21:52. On the last day of the month, sunrise is at 03:30 and sunset at 23:24 GMT.

How long on average sun shines in May in Grindavik?

In Grindavik, the average sunshine duration in May is 7.4h.

When is the lowest UV index in Grindavik?

January through May, October through December, with an average maximum UV index of 2, are months with the lowest UV index in Grindavik, Iceland.

What is the UV index reading in May in Grindavik?

In Grindavik, Iceland, the average daily maximum UV index in May is 2. A UV Index value of 2, and less, symbolizes a minimal hazard to health from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover

Average temperature in May
Grindavik, Iceland

Average temperature in May - Grindavik, Iceland
  • Average high temperature in May: 7.8°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 May: 5.1°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 May
Grindavik, Iceland

Average pressure in May - Grindavik, Iceland
  • Average pressure in May: 1011.9mbar

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 May
Grindavik, Iceland

Average wind speed in May - Grindavik, Iceland
  • Average wind speed in May: 24.8km/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 May
Grindavik, Iceland

Average humidity in May - Grindavik, Iceland
  • Average humidity in May: 77%

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 May
Grindavik, Iceland

Average rainfall in May - Grindavik, Iceland
  • Average rainfall in May: 58mm

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

Average rainfall days in May
Grindavik, Iceland

Average rainfall days in May - Grindavik, Iceland
  • Average rainfall days in May: 16.4 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 May
Grindavik, Iceland

Average snowfall in May - Grindavik, Iceland
  • Average snowfall in May: 2mm

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 May
Grindavik, Iceland

Average snowfall days in May - Grindavik, Iceland
  • Average snowfall days in May: 0.3 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 May
Grindavik, Iceland

Average sea temperature in May - Grindavik, Iceland
  • Average sea temperature in May: 7.6°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 May /
Average sunshine in May
Grindavik, Iceland

Average daylight in May / Average sunshine in May - Grindavik, Iceland
  • Average daylight in May: 18h 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 May: 7h and 2min

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 May
Grindavik, Iceland

Average sunshine days in May - Grindavik, Iceland
  • Average sunshine days in May: 12.4 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 May
Grindavik, Iceland

Average UV index in May - Grindavik, Iceland
  • Average UV index in May: 2

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 May
Grindavik, Iceland

Average cloud cover in May - Grindavik, Iceland
  • Average cloud cover in May: 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 May
Grindavik, Iceland

Average visibility in May - Grindavik, Iceland
  • Average visibility in May: 9km

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).

Grindavik, Iceland

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