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Average Weather in Rhyl United Kingdom

In Rhyl, the summers are comfortable and partly cloudy and the winters are long, very cold, wet, windy, and mostly cloudy. Over the course of the year, the temperature typically varies from 37°F to 67°F and is rarely below 28°F or above 75°F.


The warm season lasts for 3.1 months, from June 13 to September 17, with an average daily high temperature above 63°F. The hottest day of the year is August 2, with an average high of 67°F and low of 56°F.

The cool season lasts for 4.0 months, from November 21 to March 22, with an average daily high temperature below 50°F. The coldest day of the year is February 17, with an average low of 37°F and high of 46°F.

Average High and Low Temperature

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 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

Average Hourly Temperature in RhylJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMcoldcoolvery coldcomfortable
The average hourly temperature, color coded into bands: 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 shaded overlays indicate night and civil twilight.


In Rhyl, 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 Rhyl begins around April 24 and lasts for 5.5 months, ending around October 7. On July 15, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 54% of the time, and overcast or mostly cloudy 46% of the time.

The cloudier part of the year begins around October 7 and lasts for 6.6 months, ending around April 24. On January 25, the cloudiest day of the year, the sky is overcast or mostly cloudy 69% of the time, and clear, mostly clear, or partly cloudy 31% of the time.

Cloud Cover Categories

Cloud Cover Categories in RhylclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jul 1554%Jul 1554%Jan 2531%Jan 2531%Apr 2443%Apr 2443%Oct 743%Oct 743%mostly clearclearovercastpartly cloudymostly cloudy
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.


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

The wetter season lasts 4.4 months, from September 21 to February 4, with a greater than 36% chance of a given day being a wet day. The chance of a wet day peaks at 47% on November 3.

The drier season lasts 7.5 months, from February 4 to September 21. The smallest chance of a wet day is 26% on April 23.

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 November 3.

Daily Chance of Precipitation

Daily Chance of Precipitation in RhylwetwetdryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Nov 347%Nov 347%Apr 2326%Apr 2326%Jan 146%Jan 146%Sep 2136%Sep 2136%Feb 436%Feb 436%rain
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).


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 of the year. Rhyl experiences some seasonal variation in monthly rainfall.

Rain falls throughout the year in Rhyl. The most rain falls during the 31 days centered around November 9, with an average total accumulation of 3.2 inches.

The least rain falls around April 23, with an average total accumulation of 1.6 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.


The length of the day in Rhyl varies extremely over the course of the year. In 2017, the shortest day is December 21, with 7 hours, 30 minutes of daylight; the longest day is June 21, with 17 hours, 0 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 4:45 AM on June 17, and the latest sunrise is 3 hours, 44 minutes later at 8:29 AM on December 30. The earliest sunset is at 3:55 PM on December 13, and the latest sunset is 5 hours, 51 minutes later at 9:46 PM on June 24.

Daylight saving time (DST) is observed in Rhyl during 2017, starting in the spring on March 26, lasting 7.1 months, and ending in the fall on October 29.

Sunrise & Sunset with Twilight and Daylight Saving Time

Sunrise & Sunset with Twilight and Daylight Saving Time in RhylJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 174:45 AMJun 174:45 AM9:46 PMJun 249:46 PMJun 24Dec 133:55 PMDec 133:55 PM8:29 AMDec 308:29 AMDec 30Mar 26DSTMar 26DSTDSTOct 29DSTOct 29daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
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. The transitions to and from daylight saving time are indicated by the 'DST' labels.


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 Rhyl, 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

Humidity Comfort Levels in RhylJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jan 260%Jan 260%Jul 150%Jul 150%drydrycomfortablecomfortablehumidhumid
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.


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

The windier part of the year lasts for 5.4 months, from October 11 to March 24, with average wind speeds of more than 12.5 miles per hour. The windiest day of the year is January 3, with an average hourly wind speed of 15.2 miles per hour.

The calmer time of year lasts for 6.6 months, from March 24 to October 11. The calmest day of the year is June 14, with an average hourly wind speed of 9.8 miles per hour.

Average Wind Speed

Average Wind Speed in RhylwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph2 mph4 mph6 mph8 mph10 mph12 mph14 mph16 mph18 mph20 mph22 mph24 mphJan 315.2 mphJan 315.2 mphJun 149.8 mphJun 149.8 mphOct 1112.5 mphOct 1112.5 mphMar 2412.5 mphMar 2412.5 mph
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 Rhyl is from the west throughout the year.

Wind Direction

Wind Direction in RhylJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%westeastsouthnorth
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

Rhyl 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 3.3 months, from June 29 to October 5, with an average temperature above 58°F. The day of the year with the warmest water is August 15, with an average temperature of 62°F.

The time of year with cooler water lasts for 3.6 months, from December 29 to April 15, with an average temperature below 47°F. The day of the year with the coolest water is February 28, with an average temperature of 43°F.

Average Water Temperature

The daily average water temperature (purple line), 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 extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 3.4 months, from May 2 to August 14, with an average daily incident shortwave energy per square meter above 5.1 kWh. The brightest day of the year is July 1, with an average of 6.2 kWh.

The darker period of the year lasts for 4.0 months, from October 23 to February 21, with an average daily incident shortwave energy per square meter below 1.6 kWh. The darkest day of the year is December 25, with an average of 0.5 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.


For the purposes of this report, the geographical coordinates of Rhyl are 53.319 deg latitude, -3.492 deg longitude, and 13 ft elevation.

The topography within 2 miles of Rhyl is essentially flat, with a maximum elevation change of 92 feet and an average elevation above sea level of 13 feet. Within 10 miles is essentially flat (1,286 feet). Within 50 miles contains very significant variations in elevation (3,497 feet).

The area within 2 miles of Rhyl is covered by artificial surfaces (36%), water (31%), grassland (16%), and cropland (12%), within 10 miles by water (51%) and grassland (30%), and within 50 miles by water (40%) and grassland (30%).

Data Sources

This report illustrates the typical weather in Rhyl, 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 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Rhyl.

For each station, the records are corrected for the elevation difference between that station and Rhyl 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 Rhyl is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Rhyl and a given station.

The stations contributing to this reconstruction are: Hawarden (48%, 38 kilometers, southeast); Blackpool Airport (24%, 59 kilometers, northeast); Royal Air Force Valley (19%, 70 kilometers, west); and Isle Of Man / Ronaldsway Airport (9%, 113 kilometers, northwest).

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 .

Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.


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.