Summer Weather in Bermuda Bermuda

Daily high temperatures increase by 7°F, from 78°F to 85°F, rarely falling below 74°F or exceeding 89°F. The highest daily average high temperature is 85°F on August 8.

Daily low temperatures increase by 7°F, from 71°F to 78°F, rarely falling below 68°F or exceeding 81°F. The highest daily average low temperature is 79°F on August 7.

For reference, on August 7, the hottest day of the year, temperatures in Bermuda typically range from 79°F to 85°F, while on February 24, the coldest day of the year, they range from 61°F to 68°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.

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The summer in Bermuda experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 60% throughout the season. The highest chance of overcast or mostly cloudy conditions is 65% on June 28.

The clearest day of the summer is August 7, with clear, mostly clear, or partly cloudy conditions 44% of the time.

For reference, on June 28, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 65%, while on May 3, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 53%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Bermuda, the chance of a wet day over the course of the summer is increasing, starting the season at 27% and ending it at 32%.

For reference, the year's highest daily chance of a wet day is 41% on February 1, and its lowest chance is 25% on July 9.

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 Bermuda is essentially constant, remaining about 2.9 inches throughout, and rarely exceeding 6.4 inches or falling below 0.5 inches.

The lowest average 31-day accumulation is 2.4 inches on July 10.

Over the course of the summer in Bermuda, the length of the day is rapidly decreasing. From the start to the end of the season, the length of the day decreases by 1 hour, 17 minutes, implying an average daily decrease of 51 seconds, and weekly decrease of 5 minutes, 56 seconds.

The shortest day of the summer is August 31, with 12 hours, 51 minutes of daylight and the longest day is June 20, with 14 hours, 16 minutes of daylight.

The earliest sunrise of the summer in Bermuda is 6:11 AM on June 11 and the latest sunrise is 42 minutes later at 6:53 AM on August 31.

The latest sunset is 8:29 PM on June 29 and the earliest sunset is 45 minutes earlier at 7:44 PM on August 31.

Daylight saving time is observed in Bermuda during 2026, but it neither starts nor ends during the summer, so the entire season is in daylight saving time.

For reference, on June 21, the longest day of the year, the Sun rises at 6:12 AM and sets 14 hours, 16 minutes later, at 8:29 PM, while on December 21, the shortest day of the year, it rises at 7:16 AM and sets 10 hours, 2 minutes later, at 5:17 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 2026. 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 in Bermuda is very rapidly increasing during the summer, rising from 69% to 95% over the course of the season.

The highest chance of a muggy day during the summer is 100% on August 5.

For reference, on August 4, the muggiest day of the year, there are muggy conditions 100% of the time, while on February 28, the least muggy day of the year, there are muggy conditions 8% of the time.

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 Bermuda is decreasing during the summer, decreasing from 12.4 miles per hour to 11.0 miles per hour over the course of the season.

For reference, on January 31, the windiest day of the year, the daily average wind speed is 19.0 miles per hour, while on August 16, the calmest day of the year, the daily average wind speed is 10.8 miles per hour.

The lowest daily average wind speed during the summer is 10.8 miles per hour on August 16.

The hourly average wind direction in Bermuda throughout the summer is predominantly from the south, with a peak proportion of 49% on July 14.

Bermuda 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 Bermuda is rapidly increasing during the summer, rising by 9°F, from 73°F to 82°F, over the course of the season.

The highest average surface water temperature during the summer is 82°F on August 23.

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).

Temperatures in Bermuda are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.

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 Bermuda are very rapidly increasing during the summer, increasing by 2,714°F, from 2,549°F to 5,263°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 in Bermuda is decreasing during the summer, falling by 1.4 kWh, from 6.5 kWh to 5.2 kWh, over the course of the season.

For the purposes of this report, the geographical coordinates of Bermuda are 32.330 deg latitude, -64.740 deg longitude, and 13 ft elevation.

The topography within 2 miles of Bermuda contains only modest variations in elevation, with a maximum elevation change of 269 feet and an average elevation above sea level of 30 feet. Within 10 miles also contains only modest variations in elevation (282 feet). Within 50 miles also contains only modest variations in elevation (282 feet).

The area within 2 miles of Bermuda is covered by water (91%), within 10 miles by water (98%), and within 50 miles by water (100%).