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Average Weather in Reykjavík Iceland

Reykjavík has a cool humid temperate climate with short cool summers and no dry season. The temperature typically varies from 28°F to 57°F over the course of the year, and is rarely below 17°F or above 62°F.

The warm season lasts for 89 days, from June 9 to September 6, with an average daily high temperature above 53°F. The hottest day of the year is July 31, with an average high of 57°F and low of 49°F.

The cold season lasts for 147 days, from November 8 to April 4, with an average daily high temperature below 40°F. The coldest day of the year is January 24, with an average low of 28°F and high of 36°F.

Average High and Low Temperature

The daily average high (red line) and low (blue line) temperature with percentile bands, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

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

Average Hourly Temperature

12 AM4 AM8 AM12 PM4 PM8 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDecfreezingfreezingchillychillycoldcoldcoolcool
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < chilly < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The shaded overlays indicate night and civil twilight.

Sun

The length of the day in Reykjavík varies extremely over the course of the year. In 2017, the shortest day is December 21, with 4 hours, 7 minutes of daylight; the longest day is June 21, with 21 hours, 9 minutes of daylight.

Hours of Daylight and Twilight

The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise is at 2:54 AM on June 20, and the latest sunrise is 8 hours, 28 minutes later at 11:23 AM on December 25. The earliest sunset is at 3:28 PM on December 18, and the latest sunset is 8 hours, 35 minutes later at 12:03 AM on June 21.

Daylight saving time (DST) is not observed in Reykjavík during 2017.

Sunrise & Sunset with Twilight

The solar day over the course of the year 2017. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

Clouds

In Reykjavík, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year in Reykjavík begins around April 1 and lasts for 221 days, ending around November 8. On May 21, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 43% of the time, and overcast or mostly cloudy 57% of the time.

The cloudier part of the year begins around November 8 and lasts for 144 days, ending around April 1. On January 21, the cloudiest day of the year, the sky is overcast or mostly cloudy 78% of the time, and clear, mostly clear, or partly cloudy 22% of the time.

Cloud Cover

clearerclearercloudiercloudiercloudiercloudier0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecJan 2178%Jan 2178%May 2157%May 2157%Apr 168%Apr 168%Nov 868%Nov 868%overcastovercastmostly cloudymostly cloudypartly cloudypartly cloudymostly clearmostly clearclearclear
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Reykjavík varies throughout the year.

The wetter season lasts 224 days, from August 27 to April 8, with a greater than 42% chance of a given day being a wet day. The chance of a wet day peaks at 55% on February 26.

The drier season lasts 141 days, from April 8 to August 27. The smallest chance of a wet day is 29% on July 7.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 47% on September 21.

Daily Chance of Precipitation

The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day in the year. Reykjavík experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year in Reykjavík. The most rain falls during the 31 days centered around September 28, with an average total accumulation of 4.6 inches.

The least rain falls around June 8, with and average total accumulation of 2.1 inches.

Average Monthly Rainfall

The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.

Snowfall

We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end.

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day in the year. Reykjavík experiences some seasonal variation in monthly liquid-equivalent snowfall.

The snowy period of the year lasts for 183 days, from October 25 to April 26, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around January 18, with an average total liquid-equivalent accumulation of 1.0 inches.

The snowless period of the year lasts for 182 days, from April 26 to October 25. The least snow falls around July 28, with an average total liquid-equivalent accumulation of 0.0 inches.

Average Liquid-Equivalent Monthly Snowfall

The average liquid-equivalent snowfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average rainfall.

Humidity

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 perceived humidity level in Reykjavík, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 0% throughout.

Humidity Comfort Levels

0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecJul 30%Jul 30%drydry
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

Wind

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 in Reykjavík experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 187 days, from October 21 to April 26, with average wind speeds of more than 6.5 miles per hour. The windiest day of the year is January 7, with an average hourly wind speed of 8.7 miles per hour.

The calmer time of year lasts for 178 days, from April 26 to October 21. The calmest day of the year is July 21, with an average hourly wind speed of 4.3 miles per hour.

Average Wind Speed

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction in Reykjavík varies throughout the year.

The wind is most often from the south for 7 days, from February 26 to March 5; for 11 days, from April 17 to April 28; and for 137 days, from May 6 to September 20, with a peak percentage of 33% on July 25. The wind is most often from the east for 43 days, from March 5 to April 17; for 8 days, from April 28 to May 6; and for 159 days, from September 20 to February 26, with a peak percentage of 36% on December 25.

Wind Direction

EEEESSSSEE0%20%40%60%80%100%JanFebMarAprMayJunJulAugSepOctNovDecsouthsoutheasteastnorthnorthwestwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Water Temperature

Reykjavík 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 water temperature experiences some seasonal variation over the course of the year.

The time of year with warmer water lasts for 82 days, from June 24 to September 14, with an average temperature above 50°F. The day of the year with the warmest water is August 8, with an average temperature of 52°F.

The time of year with cooler water lasts for 158 days, from November 27 to May 4, with an average temperature below 43°F. The day of the year with the coolest water is March 3, with an average temperature of 41°F.

Average Water Temperature

The daily average water temperature (purple line) with percentile bands, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 experiences very significant seasonal variation over the course of the year.

The brighter period of the year lasts for 89 days, from May 5 to August 2, with an average daily incident shortwave energy per square meter above 4.1 kWh. The brightest day of the year is June 17, with an average of 5.2 kWh.

The darker period of the year lasts for 147 days, from October 10 to March 6, with an average daily incident shortwave energy per square meter below 1.1 kWh. The darkest day of the year is December 21, with an average of 0.0 kWh.

Average Daily Incident Shortwave Solar Energy

The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

The area within 2 miles of Reykjavík is covered by artificial surfaces (83%), within 10 miles by water (39%) and shrubs (30%), and within 50 miles by water (53%) and shrubs (23%).

The topography within 2 miles of Reykjavík contains only modest variations in elevation, with a maximum elevation change of 203 feet, and an average elevation above sea level of 57 feet. Within 10 miles contains large variations in elevation (2,851 feet). Within 50 miles contains extreme variations in elevation (4,426 feet).

Data Sources

This report illustrates the typical weather in Reykjavík, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

There are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Reykjavík.

For each station, the records are are corrected for the elevation difference between that station and Reykjavík according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

The estimated value at Reykjavík is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Reykjavík and a given station.

The stations contributing to this reconstruction are: Reykjavik Airport (100%, 2.3 kilometers, west) and Vestmannaeyjar Airport (0.4%, 112 kilometers, southeast).

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for aiports and weather stations are provided by AskGeo.com .