September Weather in Vilhena Brazil

Daily high temperatures are around 88°F, rarely falling below 81°F or exceeding 93°F.

Daily low temperatures are around 69°F, rarely falling below 63°F or exceeding 73°F.

For reference, on August 27, the hottest day of the year, temperatures in Vilhena typically range from 68°F to 88°F, while on July 10, the coldest day of the year, they range from 64°F to 85°F.

The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on September. 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.

Kigoma, Tanzania (6,136 miles away) is the far-away foreign place with temperatures most similar to Vilhena (view comparison).

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The month of September in Vilhena experiences very rapidly increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 36% to 57%.

The clearest day of the month is September 1, with clear, mostly clear, or partly cloudy conditions 64% of the time.

For reference, on January 11, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 88%, while on July 29, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 73%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Vilhena, the chance of a wet day over the course of September is very rapidly increasing, starting the month at 22% and ending it at 46%.

For reference, the year's highest daily chance of a wet day is 87% on February 7, and its lowest chance is 4% on July 17.

Rainfall

To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during September in Vilhena is very rapidly increasing, starting the month at 1.7 inches, when it rarely exceeds 3.2 inches or falls below 0.3 inches, and ending the month at 4.0 inches, when it rarely exceeds 5.5 inches or falls below 1.9 inches.

Over the course of September in Vilhena, the length of the day is gradually increasing. From the start to the end of the month, the length of the day increases by 20 minutes, implying an average daily increase of 42 seconds, and weekly increase of 4 minutes, 51 seconds.

The shortest day of the month is September 1, with 11 hours, 52 minutes of daylight and the longest day is September 30, with 12 hours, 12 minutes of daylight.

The latest sunrise of the month in Vilhena is 6:04 AM on September 1 and the earliest sunrise is 20 minutes earlier at 5:44 AM on September 30.

The earliest sunset is 5:56 PM on September 20 and the latest sunset is 7 seconds later at 5:56 PM on September 30.

Daylight saving time is not observed in Vilhena during 2024.

For reference, on December 21, the longest day of the year, the Sun rises at 5:32 AM and sets 12 hours, 53 minutes later, at 6:25 PM, while on June 20, the shortest day of the year, it rises at 6:21 AM and sets 11 hours, 23 minutes later, at 5:43 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 September 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 Vilhena is very rapidly increasing during September, rising from 50% to 82% over the course of the month.

For reference, on January 17, the muggiest day of the year, there are muggy conditions 100% of the time, while on July 30, the least muggy day of the year, there are muggy conditions 22% 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 Vilhena is essentially constant during September, remaining within 0.1 miles per hour of 2.1 miles per hour throughout.

For reference, on August 2, the windiest day of the year, the daily average wind speed is 2.3 miles per hour, while on March 4, the calmest day of the year, the daily average wind speed is 1.5 miles per hour.

The wind direction in Vilhena during September is predominantly out of the east from September 1 to September 5 and the north from September 5 to September 30.

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 Vilhena 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 Vilhena are rapidly increasing during September, increasing by 760°F, from 1,505°F to 2,264°F, over the course of the month.

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 Vilhena is essentially constant during September, remaining within 0.1 kWh of 5.7 kWh throughout.

For the purposes of this report, the geographical coordinates of Vilhena are -12.741 deg latitude, -60.146 deg longitude, and 1,939 ft elevation.

The topography within 2 miles of Vilhena contains only modest variations in elevation, with a maximum elevation change of 249 feet and an average elevation above sea level of 1,920 feet. Within 10 miles contains only modest variations in elevation (735 feet). Within 50 miles contains significant variations in elevation (1,440 feet).

The area within 2 miles of Vilhena is covered by grassland (57%) and shrubs (26%), within 10 miles by trees (57%) and cropland (22%), and within 50 miles by trees (85%).