Fall Weather at Olbia - Costa Smeralda Airport Italy

Daily high temperatures decrease by 24°F, from 85°F to 61°F, rarely falling below 54°F or exceeding 91°F.

Daily low temperatures decrease by 19°F, from 65°F to 46°F, rarely falling below 39°F or exceeding 70°F.

For reference, on August 4, the hottest day of the year, temperatures at Olbia - Costa Smeralda Airport typically range from 68°F to 88°F, while on February 10, the coldest day of the year, they range from 41°F to 57°F.

The figure below shows you a compact characterization of the hourly average fall 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.

Placerville, California, United States (6,114 miles away) is the far-away foreign place with temperatures most similar to Olbia - Costa Smeralda Airport (view comparison).

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The fall at Olbia - Costa Smeralda Airport experiences very rapidly increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 24% to 46%. The highest chance of overcast or mostly cloudy conditions is 47% on November 12.

The clearest day of the fall is September 1, with clear, mostly clear, or partly cloudy conditions 76% of the time.

For reference, on January 20, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 47%, while on July 21, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 89%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Olbia - Costa Smeralda Airport, the chance of a wet day over the course of the fall is very rapidly increasing, starting the season at 8% and ending it at 27%.

For reference, the year's highest daily chance of a wet day is 28% on November 25, and its lowest chance is 2% on July 14.

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 fall at Olbia - Costa Smeralda Airport is rapidly increasing, starting the season at 0.8 inches, when it rarely exceeds 1.7 inches, and ending the season at 2.1 inches, when it rarely exceeds 3.9 inches or falls below 0.5 inches.

The highest average 31-day accumulation is 2.2 inches on November 17.

Over the course of the fall at Olbia - Costa Smeralda Airport, 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 3 hours, 37 minutes, implying an average daily decrease of 2 minutes, 24 seconds, and weekly decrease of 16 minutes, 51 seconds.

The shortest day of the fall is November 30, with 9 hours, 29 minutes of daylight and the longest day is September 1, with 13 hours, 5 minutes of daylight.

The latest sunrise of the fall at Olbia - Costa Smeralda Airport is 7:44 AM on October 25 and the earliest sunrise is 59 minutes earlier at 6:45 AM on October 26.

The latest sunset is 7:54 PM on September 1 and the earliest sunset is 2 hours, 59 minutes earlier at 4:54 PM on November 30.

Daylight saving time (DST) ends at 2:00 AM on October 26, 2025, shifting sunrise and sunset to be an hour earlier.

For reference, on June 21, the longest day of the year, the Sun rises at 5:50 AM and sets 15 hours, 7 minutes later, at 8:57 PM, while on December 21, the shortest day of the year, it rises at 7:43 AM and sets 9 hours, 14 minutes later, at 4:57 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 fall of 2025. 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 Olbia - Costa Smeralda Airport is very rapidly decreasing during the fall, falling from 33% to 0% over the course of the season.

For reference, on August 12, the muggiest day of the year, there are muggy conditions 42% of the time, while on January 1, 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 Olbia - Costa Smeralda Airport is rapidly increasing during the fall, increasing from 9.0 miles per hour to 11.7 miles per hour over the course of the season.

For reference, on December 21, the windiest day of the year, the daily average wind speed is 12.2 miles per hour, while on August 5, the calmest day of the year, the daily average wind speed is 8.3 miles per hour.

The hourly average wind direction at Olbia - Costa Smeralda Airport throughout the fall is predominantly from the west, with a peak proportion of 50% on September 1.

Olbia - Costa Smeralda Airport 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 at Olbia - Costa Smeralda Airport is very rapidly decreasing during the fall, falling by 14°F, from 76°F to 62°F, over the course of the season.

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 Olbia - Costa Smeralda Airport typically lasts for 11 months (324 days), from around February 11 to around January 1, rarely starting after March 19, or ending before December 8.

The fall at Olbia - Costa Smeralda Airport is very likely fully within the growing season, with the chance that a given day is in the growing season gradually decreasing from 100% to 96% over the course of the 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 Olbia - Costa Smeralda Airport are very rapidly increasing during the fall, increasing by 1,274°F, from 3,280°F to 4,554°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 at Olbia - Costa Smeralda Airport is very rapidly decreasing during the fall, falling by 4.0 kWh, from 6.0 kWh to 2.0 kWh, over the course of the season.

For the purposes of this report, the geographical coordinates of Olbia - Costa Smeralda Airport are 40.899 deg latitude, 9.518 deg longitude, and 20 ft elevation.

The topography within 2 miles of Olbia - Costa Smeralda Airport contains only modest variations in elevation, with a maximum elevation change of 240 feet and an average elevation above sea level of 40 feet. Within 10 miles contains only modest variations in elevation (2,464 feet). Within 50 miles contains large variations in elevation (4,760 feet).

The area within 2 miles of Olbia - Costa Smeralda Airport is covered by cropland (47%), artificial surfaces (23%), water (13%), and shrubs (10%), within 10 miles by shrubs (34%) and cropland (32%), and within 50 miles by water (58%) and cropland (17%).