Summer Weather in Fortaleza Brazil

Daily high temperatures are around 87°F, rarely falling below 83°F or exceeding 89°F. The highest daily average high temperature is 87°F on December 20.

Daily low temperatures are around 78°F, rarely falling below 74°F or exceeding 81°F. The highest daily average low temperature is 79°F on December 16.

For reference, on December 17, the hottest day of the year, temperatures in Fortaleza typically range from 79°F to 87°F, while on July 17, the coldest day of the year, they range from 75°F to 86°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.

Denpasar, Indonesia (10,449 miles away); Tarakan, Indonesia (10,803 miles); and Dededo Village, Guam (11,734 miles) are the far-away foreign places with temperatures most similar to Fortaleza (view comparison).

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The summer in Fortaleza experiences increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 57% to 68%.

The clearest day of the summer is December 22, with clear, mostly clear, or partly cloudy conditions 43% of the time.

For reference, on April 15, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 77%, while on August 13, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 77%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Fortaleza, the chance of a wet day over the course of the summer is very rapidly increasing, starting the season at 2% and ending it at 56%.

For reference, the year's highest daily chance of a wet day is 73% on April 7, and its lowest chance is 0% on November 20.

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 Fortaleza is very rapidly increasing, starting the season at 0.2 inches, when it rarely exceeds 0.7 inches or falls below -0.0 inches, and ending the season at 6.2 inches, when it rarely exceeds 12.7 inches or falls below 1.6 inches.

Over the course of the summer in Fortaleza, the length of the day is essentially constant. The shortest day of the summer is February 28, with 12 hours, 11 minutes of daylight and the longest day is December 21, with 12 hours, 20 minutes of daylight.

The earliest sunrise of the summer in Fortaleza is 5:13 AM on December 1 and the latest sunrise is 28 minutes later at 5:41 AM on February 19.

The earliest sunset is 5:33 PM on December 1 and the latest sunset is 23 minutes later at 5:55 PM on February 4.

Daylight saving time is not observed in Fortaleza during 2024.

For reference, on December 21, the longest day of the year, the Sun rises at 5:22 AM and sets 12 hours, 20 minutes later, at 5:42 PM, while on June 20, the shortest day of the year, it rises at 5:38 AM and sets 11 hours, 54 minutes later, at 5:33 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 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.

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 Fortaleza is essentially constant during the summer, remaining around 100% throughout.

For reference, on February 13, the muggiest day of the year, there are muggy conditions 100% of the time, while on August 10, the least muggy day of the year, there are muggy conditions 94% 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 Fortaleza is very rapidly decreasing during the summer, decreasing from 14.6 miles per hour to 10.4 miles per hour over the course of the season.

For reference, on September 12, the windiest day of the year, the daily average wind speed is 16.3 miles per hour, while on April 3, the calmest day of the year, the daily average wind speed is 9.1 miles per hour.

The hourly average wind direction in Fortaleza throughout the summer is predominantly from the east, with a peak proportion of 100% on December 1.

Fortaleza 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 Fortaleza is essentially constant during the summer, remaining within 1°F of 82°F throughout.

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 Fortaleza 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 Fortaleza are very rapidly increasing during the summer, increasing by 2,812°F, from 4,712°F to 7,524°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 Fortaleza is decreasing during the summer, falling by 1.3 kWh, from 7.0 kWh to 5.6 kWh, over the course of the season.

For the purposes of this report, the geographical coordinates of Fortaleza are -3.717 deg latitude, -38.543 deg longitude, and 59 ft elevation.

The topography within 2 miles of Fortaleza contains only modest variations in elevation, with a maximum elevation change of 128 feet and an average elevation above sea level of 48 feet. Within 10 miles also contains only modest variations in elevation (318 feet). Within 50 miles contains only modest variations in elevation (3,688 feet).

The area within 2 miles of Fortaleza is covered by artificial surfaces (59%) and water (41%), within 10 miles by water (54%) and artificial surfaces (23%), and within 50 miles by water (65%) and shrubs (12%).