September Weather at Zurich Airport Switzerland

Daily high temperatures decrease by 8°F, from 71°F to 63°F, rarely falling below 53°F or exceeding 81°F.

Daily low temperatures decrease by 6°F, from 53°F to 47°F, rarely falling below 39°F or exceeding 59°F.

For reference, on August 3, the hottest day of the year, temperatures at Zurich Airport typically range from 57°F to 77°F, while on February 8, the coldest day of the year, they range from 27°F to 40°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.

Hope, British Columbia, Canada (5,116 miles away) is the far-away foreign place with temperatures most similar to Zurich Airport (view comparison).

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The month of September at Zurich Airport experiences increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 45% to 56%.

The clearest day of the month is September 1, with clear, mostly clear, or partly cloudy conditions 55% of the time.

For reference, on November 23, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 63%, while on July 22, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 62%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Zurich Airport, the chance of a wet day over the course of September is gradually decreasing, starting the month at 37% and ending it at 33%.

For reference, the year's highest daily chance of a wet day is 48% on June 10, and its lowest chance is 27% on February 29.

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 at Zurich Airport is gradually decreasing, starting the month at 3.7 inches, when it rarely exceeds 5.7 inches or falls below 1.9 inches, and ending the month at 3.2 inches, when it rarely exceeds 5.3 inches or falls below 1.4 inches.

Over the course of September at Zurich Airport, the length of the day is rapidly decreasing. From the start to the end of the month, the length of the day decreases by 1 hour, 38 minutes, implying an average daily decrease of 3 minutes, 22 seconds, and weekly decrease of 23 minutes, 34 seconds.

The shortest day of the month is September 30, with 11 hours, 43 minutes of daylight and the longest day is September 1, with 13 hours, 20 minutes of daylight.

The earliest sunrise of the month at Zurich Airport is 6:44 AM on September 1 and the latest sunrise is 39 minutes later at 7:23 AM on September 30.

The latest sunset is 8:05 PM on September 1 and the earliest sunset is 59 minutes earlier at 7:06 PM on September 30.

Daylight saving time is observed at Zurich Airport during 2024, but it neither starts nor ends during September, so the entire month is in daylight saving time.

For reference, on June 20, the longest day of the year, the Sun rises at 5:28 AM and sets 15 hours, 58 minutes later, at 9:26 PM, while on December 21, the shortest day of the year, it rises at 8:10 AM and sets 8 hours, 27 minutes later, at 4:37 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 at Zurich Airport is essentially constant during September, remaining around 0% throughout.

For reference, on August 6, the muggiest day of the year, there are muggy conditions 2% of the time, while on October 2, the least muggy day of the year, there are muggy conditions 0% 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 at Zurich Airport is essentially constant during September, remaining within 0.1 miles per hour of 5.8 miles per hour throughout.

For reference, on February 6, the windiest day of the year, the daily average wind speed is 7.4 miles per hour, while on August 9, the calmest day of the year, the daily average wind speed is 5.3 miles per hour.

The hourly average wind direction at Zurich Airport throughout September is predominantly from the west, with a peak proportion of 45% on September 1.

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 at Zurich Airport typically lasts for 6.3 months (193 days), from around April 19 to around October 29, rarely starting before April 2 or after May 8, and rarely ending before October 10 or after November 21.

The month of September at Zurich Airport is reliably fully 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 at Zurich Airport are increasing during September, increasing by 248°F, from 1,712°F to 1,960°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 at Zurich Airport is decreasing during September, falling by 1.5 kWh, from 4.9 kWh to 3.4 kWh, over the course of the month.

For the purposes of this report, the geographical coordinates of Zurich Airport are 47.453 deg latitude, 8.561 deg longitude, and 1,414 ft elevation.

The topography within 2 miles of Zurich Airport contains significant variations in elevation, with a maximum elevation change of 502 feet and an average elevation above sea level of 1,462 feet. Within 10 miles contains significant variations in elevation (1,749 feet). Within 50 miles contains very significant variations in elevation (11,030 feet).

The area within 2 miles of Zurich Airport is covered by artificial surfaces (60%), cropland (24%), and trees (15%), within 10 miles by cropland (36%) and trees (31%), and within 50 miles by trees (36%) and cropland (28%).