Average Weather in September in Castellar del Riu Spain
Daily high temperatures decrease by 8°F, from 71°F to 63°F, rarely falling below 55°F or exceeding 78°F.
Daily low temperatures decrease by 7°F, from 49°F to 42°F, rarely falling below 35°F or exceeding 55°F.
For reference, on July 30, the hottest day of the year, temperatures in Castellar del Riu typically range from 53°F to 75°F, while on January 11, the coldest day of the year, they range from 23°F to 41°F.
Average High and Low Temperature in September
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.
Average Hourly Temperature in September
Deschutes River Woods, Oregon, United States (5,531 miles away) and Pine Mountain Club, California, United States (5,946 miles) are the far-away foreign places with temperatures most similar to Castellar del Riu (view comparison).
The month of September in Castellar del Riu experiences increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 34% to 45%.
The clearest day of the month is September 1, with clear, mostly clear, or partly cloudy conditions 66% of the time.
For reference, on October 29, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 51%, while on July 20, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 81%.
Cloud Cover Categories in September
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Castellar del Riu, the chance of a wet day over the course of September is gradually increasing, starting the month at 17% and ending it at 21%.
For reference, the year's highest daily chance of a wet day is 24% on May 6, and its lowest chance is 12% on July 14.
Probability of Precipitation in September
The average sliding 31-day rainfall during September in Castellar del Riu is gradually increasing, starting the month at 1.3 inches, when it rarely exceeds 2.3 inches or falls below 0.3 inches, and ending the month at 1.7 inches, when it rarely exceeds 3.4 inches or falls below 0.4 inches.
Average Monthly Rainfall in September
Over the course of September in Castellar del Riu, 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, 21 minutes, implying an average daily decrease of 2 minutes, 47 seconds, and weekly decrease of 19 minutes, 31 seconds.
The shortest day of the month is September 30, with 11 hours, 48 minutes of daylight and the longest day is September 1, with 13 hours, 9 minutes of daylight.
Hours of Daylight and Twilight in September
The earliest sunrise of the month in Castellar del Riu is 7:18 AM on September 1 and the latest sunrise is 30 minutes later at 7:48 AM on September 30.
The latest sunset is 8:26 PM on September 1 and the earliest sunset is 50 minutes earlier at 7:36 PM on September 30.
Daylight saving time is observed in Castellar del Riu during 2018, but it neither starts nor ends during September, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 6:16 AM and sets 15 hours, 15 minutes later, at 9:32 PM, while on December 21, the shortest day of the year, it rises at 8:17 AM and sets 9 hours, 6 minutes later, at 5:23 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in September
The chance that a given day will be muggy in Castellar del Riu is essentially constant during September, remaining around 0% throughout.
For reference, on August 7, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in September
The average hourly wind speed in Castellar del Riu is essentially constant during September, remaining within 0.2 miles per hour of 5.2 miles per hour throughout.
For reference, on April 5, the windiest day of the year, the daily average wind speed is 7.0 miles per hour, while on August 28, the calmest day of the year, the daily average wind speed is 4.9 miles per hour.
Average Wind Speed in September
Wind Direction in September
Castellar del Riu 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 Castellar del Riu is decreasing during September, falling by 4°F, from 76°F to 72°F, over the course of the month.
Average Water Temperature in September
The growing season in Castellar del Riu typically lasts for 5.1 months (155 days), from around May 8 to around October 10, rarely starting before April 17 or after May 29, and rarely ending before September 19 or after October 31.
The month of September in Castellar del Riu is more likely than not fully within the growing season, with the chance that a given day is in the growing season rapidly decreasing from 100% to 74% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in September
The average accumulated growing degree days in Castellar del Riu are increasing during September, increasing by 212°F, from 1,276°F to 1,489°F, over the course of the month.
Growing Degree Days in September
The average daily incident shortwave solar energy in Castellar del Riu is decreasing during September, falling by 1.4 kWh, from 5.7 kWh to 4.3 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in September
For the purposes of this report, the geographical coordinates of Castellar del Riu are 42.123 deg latitude, 1.774 deg longitude, and 4,436 ft elevation.
The topography within 2 miles of Castellar del Riu contains extreme variations in elevation, with a maximum elevation change of 3,514 feet and an average elevation above sea level of 5,040 feet. Within 10 miles also contains extreme variations in elevation (6,667 feet). Within 50 miles also contains extreme variations in elevation (10,102 feet).
The area within 2 miles of Castellar del Riu is covered by trees (91%), within 10 miles by trees (65%) and cropland (14%), and within 50 miles by trees (53%) and cropland (22%).
This report illustrates the typical weather in Castellar del Riu year round, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There are 6 weather stations near enough to contribute to our estimation of the temperature and dew point in Castellar del Riu.
For each station, the records are corrected for the elevation difference between that station and Castellar del Riu according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Castellar del Riu is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Castellar del Riu and a given station.
The stations contributing to this reconstruction are: Aeroport de Girona - Costa Brava (19%, 85 kilometers, east); Barcelona–El Prat Airport (16%, 95 kilometers, south); Saint-Girons - Antichan (20%, 113 kilometers, northwest); Perpignan–Rivesaltes Airport (15%, 113 kilometers, northeast); Reus Airport (15%, 120 kilometers, southwest); and Carcassonne-Salvaza (15%, 129 kilometers, north).
Time zones for aiports and weather stations are provided by AskGeo.com .