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Summer Weather in Brest France

Daily high temperatures increase by 5°F, from 63°F to 68°F, rarely falling below 57°F or exceeding 77°F. The highest daily average high temperature is 69°F on August 2.

Daily low temperatures increase by 4°F, from 51°F to 56°F, rarely falling below 46°F or exceeding 62°F. The highest daily average low temperature is 57°F on August 7.

For reference, on August 1, the hottest day of the year, temperatures in Brest typically range from 57°F to 69°F, while on February 7, the coldest day of the year, they range from 40°F to 49°F.

Average High and Low Temperature in the Summer in Brest

Average High and Low Temperature in the Summer in BrestJunJulAug40°F40°F45°F45°F50°F50°F55°F55°F60°F60°F65°F65°F70°F70°F75°F75°F80°F80°FSpringFallAug 169°FAug 169°F57°F57°FJun 163°FJun 163°F51°F51°FAug 3168°FAug 3168°F56°F56°FJul 167°FJul 167°F55°F55°F
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 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.

Average Hourly Temperature in the Summer in Brest

Average Hourly Temperature in the Summer in BrestJunJulAug12 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 AMSpringFallcoldcoldcoolcomfortablecold
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.

Lincoln City, Oregon, United States (5,031 miles away) and Scottsdale, Tasmania, Australia (10,997 miles) are the far-away foreign places with temperatures most similar to Brest (view comparison).

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The summer in Brest experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 49% to 44%. The lowest chance of overcast or mostly cloudy conditions is 39% on July 23.

The clearest day of the summer is July 23, with clear, mostly clear, or partly cloudy conditions 61% of the time.

For reference, on January 3, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 66%, while on July 23, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 61%.

Cloud Cover Categories in the Summer in Brest

Cloud Cover Categories in the Summer in BrestJunJulAug0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%SpringFallJan 334%Jan 334%Jun 151%Jun 151%Aug 3156%Aug 3156%Jul 158%Jul 158%Aug 160%Aug 160%clearmostly clearpartly cloudymostly 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 Brest, the chance of a wet day over the course of the summer is essentially constant, remaining around 19% throughout.

For reference, the year's highest daily chance of a wet day is 42% on December 30, and its lowest chance is 16% on July 31.

Probability of Precipitation in the Summer in Brest

Probability of Precipitation in the Summer in BrestJunJulAug0%0%5%5%10%10%15%15%20%20%25%25%30%30%SpringFallJul 3116%Jul 3116%Jun 122%Jun 122%Aug 3120%Aug 3120%Jul 119%Jul 119%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).

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 in Brest is essentially constant, remaining about 1.3 inches throughout, and rarely exceeding 3.3 inches or falling below 0.2 inches.

The lowest average 31-day accumulation is 1.1 inches on July 24.

Average Monthly Rainfall in the Summer in Brest

Average Monthly Rainfall in the Summer in BrestJunJulAug0 in0 in1 in1 in2 in2 in3 in3 in4 in4 in5 in5 inSpringFallJul 231.1 inJul 231.1 inJun 11.5 inJun 11.5 inAug 311.4 inAug 311.4 inJul 11.2 inJul 11.2 in
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.

Over the course of the summer in Brest, 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 2 hours, 25 minutes, implying an average daily decrease of 1 minute, 35 seconds, and weekly decrease of 11 minutes, 7 seconds.

The shortest day of the summer is August 31, with 13 hours, 26 minutes of daylight and the longest day is June 20, with 16 hours, 7 minutes of daylight.

Hours of Daylight and Twilight in the Summer in Brest

Hours of Daylight and Twilight in the Summer in BrestJunJulAug0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrSpringFallJun 2016 hr, 7 minJun 2016 hr, 7 minnightnightdaydayAug 3113 hr, 26 minAug 3113 hr, 26 minAug 115 hr, 1 minAug 115 hr, 1 min
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 of the summer in Brest is 6:15 AM on June 15 and the latest sunrise is 1 hour, 19 minutes later at 7:34 AM on August 31.

The latest sunset is 10:23 PM on June 25 and the earliest sunset is 1 hour, 23 minutes earlier at 9:00 PM on August 31.

Daylight saving time is observed in Brest during 2024, but it neither starts nor ends during the summer, so the entire season is in daylight saving time.

For reference, on June 20, the longest day of the year, the Sun rises at 6:16 AM and sets 16 hours, 7 minutes later, at 10:22 PM, while on December 21, the shortest day of the year, it rises at 9:06 AM and sets 8 hours, 19 minutes later, at 5:25 PM.

Sunrise & Sunset with Twilight in the Summer in Brest

Sunrise & Sunset with Twilight in the Summer in BrestJunJulAug4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AM2 AMSpringFall6:15 AM6:15 AMJun 1510:21 PMJun 1510:21 PM7:34 AM7:34 AMAug 319:00 PMAug 319:00 PM6:20 AM6:20 AM6:53 AM6:53 AMAug 19:54 PMAug 19:54 PMSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day in the summer. 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 Summer in Brest

Solar Elevation and Azimuth in the Summer in BrestJunJulAug12 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 AMSpringFall00102020303040506000101020303040405060
northeastsouthwest
Solar elevation and azimuth in the the summer 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 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.

Moon Rise, Set & Phases in the Summer in Brest

Moon Rise, Set & Phases in the Summer in BrestJunJulAug12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMSpringFallMay 85:23 AMMay 85:23 AMMay 233:54 PMMay 233:54 PMJun 62:38 PMJun 62:38 PMJun 223:09 AMJun 223:09 AMJul 612:58 AMJul 612:58 AMJul 2112:18 PMJul 2112:18 PMAug 41:14 PMAug 41:14 PMAug 198:26 PMAug 198:26 PMSep 33:56 AMSep 33:56 AMSep 184:35 AMSep 184:35 AM6:36 AM6:36 AM10:46 PM10:46 PM6:27 AM6:27 AM11:00 PM11:00 PM5:57 AM5:57 AM10:45 PM10:45 PM6:01 AM6:01 AM10:19 PM10:19 PM9:40 PM9:40 PM7:52 AM7:52 AM7:47 AM7:47 AM9:13 PM9:13 PM8:19 PM8:19 PM8:14 AM8:14 AM
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 Brest is essentially constant during the summer, remaining within 1% of 1% throughout.

The highest chance of a muggy day during the summer is 2% on August 10.

For reference, on August 10, the muggiest day of the year, there are muggy conditions 2% of the time, while on October 22, the least muggy day of the year, there are muggy conditions 0% of the time.

Humidity Comfort Levels in the Summer in Brest

Humidity Comfort Levels in the Summer in BrestJunJulAug0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%SpringFallAug 102%Aug 102%Jun 10%Jun 10%Aug 311%Aug 311%Jul 11%Jul 11%humidhumidcomfortablecomfortabledrydry
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 Brest is essentially constant during the summer, remaining within 0.7 miles per hour of 11.6 miles per hour throughout.

For reference, on January 1, the windiest day of the year, the daily average wind speed is 17.1 miles per hour, while on August 4, the calmest day of the year, the daily average wind speed is 10.9 miles per hour.

The lowest daily average wind speed during the summer is 10.9 miles per hour on August 5.

Average Wind Speed in the Summer in Brest

Average Wind Speed in the Summer in BrestJunJulAug0 mph0 mph5 mph5 mph10 mph10 mph15 mph15 mph20 mph20 mphSpringFallAug 510.9 mphAug 510.9 mphJun 112.3 mphJun 112.3 mphAug 3111.8 mphAug 3111.8 mphJul 111.8 mphJul 111.8 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The hourly average wind direction in Brest throughout the summer is predominantly from the west, with a peak proportion of 43% on July 5.

Wind Direction in the Summer in Brest

Wind Direction in the Summer in BrestNWJunJulAug0%100%20%80%40%60%60%40%80%20%100%0%SpringFallwestsouthnortheast
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).

Brest 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 Brest is increasing during the summer, rising by 5°F, from 56°F to 61°F, over the course of the season.

The highest average surface water temperature during the summer is 61°F on August 11.

Average Water Temperature in the Summer in Brest

Average Water Temperature in the Summer in BrestJunJulAug50°F50°F52°F52°F54°F54°F56°F56°F58°F58°F60°F60°F62°F62°F64°F64°FSpringFallAug 1161°FAug 1161°FJun 156°FJun 156°FAug 3161°FAug 3161°FJul 159°FJul 159°F
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 Brest typically lasts for 10.0 months (303 days), from around February 17 to around December 15, rarely starting after March 18, or ending before November 19.

The summer in Brest is reliably fully within the growing season.

Time Spent in Various Temperature Bands and the Growing Season in the Summer in Brest

Time Spent in Various Temperature Bands and the Growing Season in the Summer in Brestgrowing seasongrowing seasonJunJulAug0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%SpringFall100%Jul 17100%Jul 17coldcoolcomfortablewarmvery cold
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 Brest are very rapidly increasing during the summer, increasing by 1,028°F, from 306°F to 1,335°F, over the course of the season.

Growing Degree Days in the Summer in Brest

Growing Degree Days in the Summer in BrestJunJulAug400°F400°F600°F600°F800°F800°F1,000°F1,000°F1,200°F1,200°F1,400°F1,400°FSpringFallJun 1306°FJun 1306°FAug 311,335°FAug 311,335°FJul 1581°FJul 1581°FAug 1963°FAug 1963°F
The average growing degree days accumulated over the course of the summer, 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 Brest is rapidly decreasing during the summer, falling by 1.6 kWh, from 6.6 kWh to 5.0 kWh, over the course of the season.

The highest average daily incident shortwave solar energy during the summer is 6.9 kWh on June 27.

Average Daily Incident Shortwave Solar Energy in the Summer in Brest

Average Daily Incident Shortwave Solar Energy in the Summer in BrestJunJulAug0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhSpringFallJun 276.9 kWhJun 276.9 kWhJun 16.6 kWhJun 16.6 kWhAug 315.0 kWhAug 315.0 kWhAug 16.3 kWhAug 16.3 kWh
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 Brest are 48.400 deg latitude, -4.483 deg longitude, and 194 ft elevation.

The topography within 2 miles of Brest contains only modest variations in elevation, with a maximum elevation change of 384 feet and an average elevation above sea level of 164 feet. Within 10 miles contains only modest variations in elevation (561 feet). Within 50 miles contains significant variations in elevation (1,273 feet).

The area within 2 miles of Brest is covered by artificial surfaces (84%), within 10 miles by cropland (50%) and water (23%), and within 50 miles by water (64%) and cropland (25%).

This report illustrates the typical weather in Brest, 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 Brest.

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

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.

Please review our full terms contained on our Terms of Service page.