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Spring Weather in Reykjavík Iceland

Daily high temperatures increase by 14°F, from 37°F to 51°F, rarely falling below 28°F or exceeding 57°F.

Daily low temperatures increase by 14°F, from 29°F to 43°F, rarely falling below 18°F or exceeding 48°F.

For reference, on July 30, the hottest day of the year, temperatures in Reykjavík typically range from 49°F to 57°F, while on January 24, the coldest day of the year, they range from 28°F to 36°F.

Average High and Low Temperature in the Spring in Reykjavík

Average High and Low Temperature in the Spring in ReykjavíkMarAprMay15°F15°F20°F20°F25°F25°F30°F30°F35°F35°F40°F40°F45°F45°F50°F50°F55°F55°F60°F60°FWinterSummerMar 137°FMar 137°F29°F29°FMay 3151°FMay 3151°F43°F43°FApr 140°FApr 140°F31°F31°FMay 145°FMay 145°F36°F36°FNowNow
The daily average high (red line) and low (blue line) temperature, 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 hourly average spring 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.

Average Hourly Temperature in the Spring in Reykjavík

Average Hourly Temperature in the Spring in ReykjavíkMarAprMay12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMWinterSummerNowNowfreezingvery coldcoldfreezing
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Sand Point, Alaska, United States (3,898 miles away) and Kodiak, Alaska, United States (3,624 miles) are the far-away foreign places with temperatures most similar to Reykjavík (view comparison).

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The spring in Reykjavík experiences rapidly decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 75% to 59%. The lowest chance of overcast or mostly cloudy conditions is 57% on May 20.

The clearest day of the spring is May 20, with clear, mostly clear, or partly cloudy conditions 43% of the time.

For reference, on January 21, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 78%, while on May 20, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 43%.

Cloud Cover Categories in the Spring in Reykjavík

Cloud Cover Categories in the Spring in ReykjavíkMarAprMay0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%WinterSummerJan 2122%Jan 2122%Mar 125%Mar 125%May 3141%May 3141%Apr 133%Apr 133%May 141%May 141%NowNowclearmostly clearpartly cloudyovercast
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Reykjavík, the chance of a wet day over the course of the spring is very rapidly decreasing, starting the season at 54% and ending it at 29%.

For reference, the year's highest daily chance of a wet day is 55% on February 26, and its lowest chance is 29% on July 6.

Over the course of the spring in Reykjavík, the chance of a day with only rain decreases from 33% to 29%, the chance of a day with mixed snow and rain decreases from 13% to 0%, and the chance of a day with only snow decreases from 7% to 0%.

Probability of Precipitation in the Spring in Reykjavík

Probability of Precipitation in the Spring in ReykjavíkMarAprMay0%0%5%5%10%10%15%15%20%20%25%25%30%30%35%35%40%40%45%45%50%50%55%55%60%60%WinterSummerMar 154%Mar 154%May 3129%May 3129%Apr 144%Apr 144%May 136%May 136%NowNowsnowmixedrain
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 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 spring in Reykjavík is rapidly decreasing, starting the season at 4.1 inches, when it rarely exceeds 6.5 inches or falls below 1.7 inches, and ending the season at 2.2 inches, when it rarely exceeds 4.0 inches or falls below 0.8 inches.

Average Monthly Rainfall in the Spring in Reykjavík

Average Monthly Rainfall in the Spring in ReykjavíkMarAprMay0 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 inWinterSummerMar 14.1 inMar 14.1 inMay 312.2 inMay 312.2 inApr 13.3 inApr 13.3 inMay 12.7 inMay 12.7 inNowNow
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 snowfall.

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day snowfall during the spring in Reykjavík is very rapidly decreasing, starting the season at 8.5 inches, when it rarely exceeds 19.2 inches or falls below 0.5 inches, and ending the season at 0.0 inches, when it rarely exceeds -0.0 inches or falls below -0.0 inches.

Average Monthly Snowfall in the Spring in Reykjavík

Average Monthly Snowfall in the Spring in ReykjavíkMarAprMay0 in0 in5 in5 in10 in10 in15 in15 in20 in20 in25 in25 inWinterSummerMar 18.5 inMar 18.5 inMay 310.0 inMay 310.0 inApr 14.0 inApr 14.0 inMay 10.6 inMay 10.6 inNowNow
The average 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.

Over the course of the spring in Reykjavík, the length of the day is very rapidly increasing. From the start to the end of the season, the length of the day increases by 9 hours, 51 minutes, implying an average daily increase of 6 minutes, 29 seconds, and weekly increase of 45 minutes, 26 seconds.

The shortest day of the spring is March 1, with 10 hours, 14 minutes of daylight and the longest day is May 31, with 20 hours, 4 minutes of daylight.

Hours of Daylight and Twilight in the Spring in Reykjavík

Hours of Daylight and Twilight in the Spring in ReykjavíkMarAprMay0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrWinterSummer12 hr, 11 minMar 2012 hr, 11 minMar 20nightnightdayday20 hr, 4 minMay 3120 hr, 4 minMay 3116 hr, 55 minMay 116 hr, 55 minMay 1NowNow
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 latest sunrise of the spring in Reykjavík is 8:33 AM on March 1 and the earliest sunrise is 5 hours, 9 minutes earlier at 3:24 AM on May 31.

The earliest sunset is 6:47 PM on March 1 and the latest sunset is 4 hours, 41 minutes later at 11:28 PM on May 31.

Daylight saving time is not observed in Reykjavík during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 2:55 AM and sets 21 hours, 8 minutes later, at 12:03 AM, while on December 21, the shortest day of the year, it rises at 11:22 AM and sets 4 hours, 7 minutes later, at 3:29 PM.

Sunrise & Sunset with Twilight in the Spring in Reykjavík

Sunrise & Sunset with Twilight in the Spring in ReykjavíkMarAprMay2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMWinterSummer3:24 AM3:24 AM11:28 PMMay 3111:28 PMMay 318:33 AM8:33 AM6:47 PMMar 16:47 PMMar 16:44 AM6:44 AM8:20 PMApr 18:20 PMApr 14:58 AM4:58 AM9:53 PMMay 19:53 PMMay 1SolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day in the spring. 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.

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.

Solar Elevation and Azimuth in the Spring in Reykjavík

Solar Elevation and Azimuth in the Spring in ReykjavíkMarAprMay12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMWinterSummer0010202030001010203040NowNow
northeastsouthwest
Solar elevation and azimuth in the the spring of 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for the spring 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.

Moon Rise, Set & Phases in the Spring in Reykjavík

Moon Rise, Set & Phases in the Spring in ReykjavíkMarAprMay12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMWinterSummerFeb 911:00 PMFeb 911:00 PMFeb 2412:31 PMFeb 2412:31 PMMar 109:01 AMMar 109:01 AMMar 257:01 AMMar 257:01 AMApr 86:22 PMApr 86:22 PMApr 2311:50 PMApr 2311:50 PMMay 83:23 AMMay 83:23 AMMay 231:54 PMMay 231:54 PMJun 612:38 PMJun 612:38 PM10:52 AM10:52 AM4:15 PM4:15 PM8:30 AM8:30 AM7:41 PM7:41 PM7:02 PM7:02 PM7:25 AM7:25 AM6:27 AM6:27 AM8:46 PM8:46 PM9:23 PM9:23 PM5:11 AM5:11 AM10:38 PM10:38 PM
The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.

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 in Reykjavík is essentially constant during the spring, remaining around 0% throughout.

Humidity Comfort Levels in the Spring in Reykjavík

Humidity Comfort Levels in the Spring in ReykjavíkMarAprMay0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%WinterSummerApr 160%Apr 160%Mar 10%Mar 10%May 310%May 310%Apr 10%Apr 10%May 10%May 10%drydry
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

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 is very rapidly decreasing during the spring, decreasing from 15.0 miles per hour to 9.1 miles per hour over the course of the season.

For reference, on January 7, the windiest day of the year, the daily average wind speed is 16.1 miles per hour, while on July 20, the calmest day of the year, the daily average wind speed is 7.9 miles per hour.

Average Wind Speed in the Spring in Reykjavík

Average Wind Speed in the Spring in ReykjavíkMarAprMay0 mph0 mph5 mph5 mph10 mph10 mph15 mph15 mph20 mph20 mph25 mph25 mphWinterSummerMar 115.0 mphMar 115.0 mphMay 319.1 mphMay 319.1 mphApr 113.4 mphApr 113.4 mphMay 111.4 mphMay 111.4 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The wind direction in Reykjavík during the spring is predominantly out of the south from March 1 to March 4, from April 16 to April 27, and from May 5 to May 31 and the east from March 4 to April 16 and from April 27 to May 5.

Wind Direction in the Spring in Reykjavík

Wind Direction in the Spring in ReykjavíkESESESMarAprMay0%100%20%80%40%60%60%40%80%20%100%0%WinterSummerNowNowwestsoutheastnorth
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

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 surface water temperature in Reykjavík is increasing during the spring, rising by 6°F, from 41°F to 47°F, over the course of the season.

The lowest average surface water temperature during the spring is 41°F on March 3.

Average Water Temperature in the Spring in Reykjavík

Average Water Temperature in the Spring in ReykjavíkMarAprMay38°F38°F40°F40°F42°F42°F44°F44°F46°F46°F48°F48°F50°F50°F52°F52°F54°F54°FWinterSummerMar 341°FMar 341°FMay 3147°FMay 3147°FApr 141°FApr 141°FMay 143°FMay 143°FNowNow
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

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 in Reykjavík typically lasts for 4.9 months (148 days), from around May 9 to around October 5, rarely starting before April 21 or after May 29, and rarely ending before September 15 or after October 23.

During the spring in Reykjavík, the chance that a given day is within the growing season is very rapidly increasing rising from 0% to 93% over the course of the season.

Time Spent in Various Temperature Bands and the Growing Season in the Spring in Reykjavík

Time Spent in Various Temperature Bands and the Growing Season in the Spring in Reykjavíkgrowing seasonMarAprMay0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%WinterSummerMar 10%Mar 10%93%May 3193%May 31Apr 10%Apr 10%May 129%May 129%freezingvery coldcoldcool
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is 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 in Reykjavík are essentially constant during the spring, remaining within 7°F of 7°F throughout.

Growing Degree Days in the Spring in Reykjavík

Growing Degree Days in the Spring in ReykjavíkMarAprMay0°F0°F5°F5°F10°F10°F15°F15°F20°F20°F25°F25°FWinterSummerMar 10°FMar 10°FMay 3113°FMay 3113°FApr 10°FApr 10°FMay 11°FMay 11°F
The average growing degree days accumulated over the course of the spring, with 25th to 75th and 10th to 90th percentile bands.

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 in Reykjavík is very rapidly increasing during the spring, rising by 4.2 kWh, from 0.9 kWh to 5.1 kWh, over the course of the season.

Average Daily Incident Shortwave Solar Energy in the Spring in Reykjavík

Average Daily Incident Shortwave Solar Energy in the Spring in ReykjavíkMarAprMay0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWhWinterSummerMar 10.9 kWhMar 10.9 kWhMay 315.1 kWhMay 315.1 kWhApr 12.3 kWhApr 12.3 kWhMay 14.0 kWhMay 14.0 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

For the purposes of this report, the geographical coordinates of Reykjavík are 64.135 deg latitude, -21.895 deg longitude, and 125 ft elevation.

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 only modest variations in elevation (2,851 feet). Within 50 miles contains large variations in elevation (4,426 feet).

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%).

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 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:

To get a sense of how much these sources agree with each other, you can view a comparison of Reykjavík and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , 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 airports and weather stations are provided by AskGeo.com .

Maps are © OpenStreetMap contributors.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

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