Summer Weather at Vestmannaeyjar Airport Iceland

Daily high temperatures are around 52°F, rarely falling below 46°F or exceeding 59°F. The highest daily average high temperature is 55°F on July 31.

Daily low temperatures are around 47°F, rarely falling below 40°F or exceeding 53°F. The highest daily average low temperature is 50°F on August 1.

For reference, on July 31, the hottest day of the year, temperatures at Vestmannaeyjar Airport typically range from 50°F to 55°F, while on March 7, the coldest day of the year, they range from 33°F to 39°F.

The figure below shows you a compact characterization of the hourly average summer temperatures. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Dutch Harbor, United States (4,135 miles away) is the far-away foreign place with temperatures most similar to Vestmannaeyjar Airport (view comparison).

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The summer at Vestmannaeyjar Airport experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 59% to 64%.

The clearest day of the summer is June 1, with clear, mostly clear, or partly cloudy conditions 41% of the time.

For reference, on February 5, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 76%, while on May 5, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 43%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Vestmannaeyjar Airport, the chance of a wet day over the course of the summer is very rapidly increasing, starting the season at 30% and ending it at 44%.

For reference, the year's highest daily chance of a wet day is 59% on February 28, and its lowest chance is 29% on May 26.

Rainfall

To show variation within the season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during the summer at Vestmannaeyjar Airport is very rapidly increasing, starting the season at 2.2 inches, when it rarely exceeds 4.2 inches or falls below 0.8 inches, and ending the season at 4.4 inches, when it rarely exceeds 6.8 inches or falls below 2.4 inches.

The lowest average 31-day accumulation is 2.2 inches on June 3.

Over the course of the summer at Vestmannaeyjar Airport, the length of the day is very rapidly decreasing. From the start to the end of the season, the length of the day decreases by 5 hours, 14 minutes, implying an average daily decrease of 3 minutes, 27 seconds, and weekly decrease of 24 minutes, 7 seconds.

The shortest day of the summer is August 31, with 14 hours, 32 minutes of daylight and the longest day is June 20, with 20 hours, 36 minutes of daylight.

The earliest sunrise of the summer at Vestmannaeyjar Airport is 3:05 AM on June 19 and the latest sunrise is 2 hours, 59 minutes later at 6:04 AM on August 31.

The latest sunset is 11:40 PM on June 21 and the earliest sunset is 3 hours, 5 minutes earlier at 8:36 PM on August 31.

Daylight saving time is not observed at Vestmannaeyjar Airport during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 3:05 AM and sets 20 hours, 36 minutes later, at 11:40 PM, while on December 21, the shortest day of the year, it rises at 11:04 AM and sets 4 hours, 30 minutes later, at 3:34 PM.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

The figure below presents a compact representation of key lunar data for the summer of 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The chance that a given day will be muggy at Vestmannaeyjar Airport is essentially constant during the summer, remaining around 0% throughout.

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed at Vestmannaeyjar Airport is increasing during the summer, increasing from 12.8 miles per hour to 14.3 miles per hour over the course of the season.

For reference, on December 30, the windiest day of the year, the daily average wind speed is 21.0 miles per hour, while on July 12, the calmest day of the year, the daily average wind speed is 11.6 miles per hour.

The lowest daily average wind speed during the summer is 11.6 miles per hour on July 20.

The hourly average wind direction at Vestmannaeyjar Airport throughout the summer is predominantly from the east, with a peak proportion of 37% on June 1.

Vestmannaeyjar Airport is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average surface water temperature at Vestmannaeyjar Airport is increasing during the summer, rising by 4°F, from 48°F to 52°F, over the course of the season.

The highest average surface water temperature during the summer is 53°F on August 8.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

The growing season at Vestmannaeyjar Airport typically lasts for 5.9 months (179 days), from around April 26 to around October 21, rarely starting before April 4 or after May 16, and rarely ending before October 1 or after November 12.

The summer at Vestmannaeyjar Airport is reliably fully within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

The average accumulated growing degree days at Vestmannaeyjar Airport are gradually increasing during the summer, increasing by 144°F, from 3°F to 147°F, over the course of the season.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy at Vestmannaeyjar Airport is very rapidly decreasing during the summer, falling by 2.3 kWh, from 5.1 kWh to 2.9 kWh, over the course of the season.

The highest average daily incident shortwave solar energy during the summer is 5.3 kWh on June 25.

For the purposes of this report, the geographical coordinates of Vestmannaeyjar Airport are 63.424 deg latitude, -20.279 deg longitude, and 276 ft elevation.

The topography within 2 miles of Vestmannaeyjar Airport contains very significant variations in elevation, with a maximum elevation change of 860 feet and an average elevation above sea level of 89 feet. Within 10 miles also contains very significant variations in elevation (919 feet). Within 50 miles contains very significant variations in elevation (5,410 feet).

The area within 2 miles of Vestmannaeyjar Airport is covered by water (51%) and shrubs (16%), within 10 miles by water (95%), and within 50 miles by water (68%) and shrubs (10%).