May weather forecast and climate
Reykjavík, Iceland

The city buildings of Reykjavík, the capital city of Iceland, with a view of the sea, and a mountain with a snowy peak in the far distance
The city buildings of Reykjavík, the capital city of Iceland, with a view of the sea, and a mountain with a snowy peak in the far distance
The last month of the spring, May, is a chilly month in Reykjavík, Iceland, with average temperature varying between 4.1°C (39.4°F) and 8.3°C (46.9°F).

Temperature

In May, the average high-temperature slightly increases, from a wintry 4.9°C (40.8°F) in April, to a frosty 8.3°C (46.9°F). In May, in Reykjavík, the average low-temperature is 4.1°C (39.4°F).

Humidity

The least humid month in Reykjavík is May, with an average relative humidity of 75%.

Rainfall

In Reykjavík, during May, the rain falls for 15.5 days and regularly aggregates up to 32mm (1.26") of precipitation. In Reykjavík, during the entire year, the rain falls for 166.2 days and collects up to 416mm (16.38") of precipitation.

Snowfall

January through May, October through December are months with snowfall in Reykjavík, Iceland. May is the last month it regularly snows in Reykjavík. During 1.2 snowfall days, Reykjavík aggregates 2mm (0.08") of snow. Throughout the year, there are 41.1 snowfall days, and 309mm (12.17") of snow is accumulated.

Sea temperature

In May, the average sea temperature is 7.2°C (45°F).
Note: 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.

Daylight

In Reykjavík, Iceland, the average length of the day in May is 18.5h.

Sunshine

In Reykjavík, the average sunshine in May is 7h.

UV index

In Reykjavík, the average daily maximum UV index in May is 2. A UV Index estimate of 2, and below, represents a low health risk from unsafe exposure to the UV radiation for average individuals.
Note: In May, the average maximum UV index of 2 translate into the following recommendations:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in May in Reykjavík?

In Reykjavík, Iceland, in May, the average high-temperature is 8.3°C (46.9°F), and the average low-temperature is 4.1°C (39.4°F).

What is the least humid month in Reykjavík?

The least humid month is May, with an average relative humidity of 75%.

What is the average humidity in May in Reykjavík?

In Reykjavík, Iceland, the average relative humidity in May is 75%.

How much does it rain in Reykjavík in May?

In Reykjavík, Iceland, during May, the rain falls for 15.5 days and regularly aggregates up to 32mm (1.26") of precipitation.

What is the last month it snows in Reykjavík?

May is the last month it regularly snows. During 1.2 snowfall days, in May, Reykjavík aggregates 2mm (0.08") of snow.

How cold is the water in May in Reykjavík?

In May, the average sea temperature is 7.2°C (45°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 Reykjavík have in May?

The average length of the day in May is 18.5h.

How long on average sun shines in May in Reykjavík?

In Reykjavík, Iceland, the average sunshine in May is 7h.

What is the UV index reading in May in Reykjavík?

In Reykjavík, the average daily maximum UV index in May is 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to the Sun's UV rays.
Average temperature in May - Reykjavík, Iceland
  • Average high temperature in May: 8.3°C

The warmest month (with the highest average high temperature) is July (13.5°C).
The month with the lowest average high temperature is December (1.3°C).

  • Average low temperature in May: 4.1°C

The month with the highest average low temperature is July (9.1°C).
The coldest month (with the lowest average low temperature) is December (-2.4°C).

Average pressure in May - Reykjavík, Iceland
  • Average pressure in May: 1012.1mbar

The month with the highest atmospheric pressure is June (1013.8mbar).
The month with the lowest atmospheric pressure is January (996.6mbar).

Average wind speed in May - Reykjavík, Iceland
  • Average wind speed in May: 19.1km/h

The windiest month (with the highest average wind speed) is February (24.9km/h).
The calmest months (with the lowest average wind speed) are June and July (14.9km/h).

Average humidity in May - Reykjavík, Iceland
  • Average humidity in May: 75%

Months with the highest relative humidity are January, February and September (82%).
The month with the lowest relative humidity is May (75%).

Average rainfall in May - Reykjavík, Iceland
  • Average rainfall in May: 32mm

The wettest month (with the highest rainfall) is January (47mm).
The driest months (with the least rainfall) are June and July (25mm).

Average rainfall days in May - Reykjavík, Iceland
  • Average rainfall days in May: 15.5 days

The month with the highest number of rainy days is September (17.8 days).
The month with the least rainy days is December (9.7 days).

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

The month with the highest snowfall is March (100mm).
Months with the least snowfall are June, July, August and September (0mm).

Average snowfall days in May - Reykjavík, Iceland
  • Average snowfall days in May: 1.2 days

The month with the highest number of snowfall days is March (9.4 days).
Months with the least snowfall days are June, July, August and September (0 days).

Average sea temperature in May - Reykjavík, Iceland
  • Average sea temperature in May: 7.2°C

The best month for swimming (with the highest average sea temperature) is July (11.4°C).
The coldest month (with the lowest average sea temperature) is March (5.1°C).

Average daylight in May / Average sunshine in May - Reykjavík, Iceland
  • Average daylight in May: 18.5h

The month with the longest days is June (Average daylight: 20.9h).
The month with the shortest days is December (Average daylight: 4.4h).

  • Average sunshine in May: 7h

The month with the most sunshine is August (Average sunshine: 7.4h).
The month with the least sunshine is January (Average sunshine: 2.4h).

Average sunshine days in May - Reykjavík, Iceland
  • Average sunshine days in May: 10.4 days

The month with the most sunshine days is December (14.1 days).
The month with the least sunshine days is September (8.8 days).

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

The month with the highest UV index is July (UV index 4).
Months with the lowest UV index are January, February and November (UV index 1).

Average cloud cover in May - Reykjavík, Iceland
  • Average cloud cover in May: 62

Months with the most cloud cover are March and April (Cloud cover 68).
Months with the least cloud cover are August and December (Cloud cover 60).

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

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