Average Weather in September in Santa Rosa Bolivia
Daily high temperatures are around 93°F, rarely falling below 84°F or exceeding 101°F.
Daily low temperatures increase by 3°F, from 70°F to 73°F, rarely falling below 63°F or exceeding 78°F.
For reference, on September 28, the hottest day of the year, temperatures in Santa Rosa typically range from 73°F to 94°F, while on July 20, the coldest day of the year, they range from 66°F to 86°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
The month of September in Santa Rosa experiences very rapidly increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 36% to 56%.
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 13, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 84%, while on August 4, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 70%.
Cloud Cover Categories in September
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Santa Rosa, the chance of a wet day over the course of September is rapidly increasing, starting the month at 19% and ending it at 27%.
For reference, the year's highest daily chance of a wet day is 64% on February 16, and its lowest chance is 16% on August 4.
Probability of Precipitation in September
The average sliding 31-day rainfall during September in Santa Rosa is rapidly increasing, starting the month at 2.3 inches, when it rarely exceeds 5.2 inches or falls below 0.5 inches, and ending the month at 3.4 inches, when it rarely exceeds 5.6 inches or falls below 1.6 inches.
Average Monthly Rainfall in September
Over the course of September in Santa Rosa, the length of the day is gradually increasing. From the start to the end of the month, the length of the day increases by 22 minutes, implying an average daily increase of 46 seconds, and weekly increase of 5 minutes, 25 seconds.
The shortest day of the month is September 1, with 11 hours, 50 minutes of daylight and the longest day is September 30, with 12 hours, 13 minutes of daylight.
Hours of Daylight and Twilight in September
The latest sunrise of the month in Santa Rosa is 6:32 AM on September 1 and the earliest sunrise is 21 minutes earlier at 6:11 AM on September 30.
The earliest sunset is 6:22 PM on September 1 and the latest sunset is 1 minute, 12 seconds later at 6:23 PM on September 30.
Daylight saving time is not observed in Santa Rosa during 2021.
For reference, on December 21, the longest day of the year, the Sun rises at 5:56 AM and sets 12 hours, 58 minutes later, at 6:54 PM, while on June 21, the shortest day of the year, it rises at 6:50 AM and sets 11 hours, 17 minutes later, at 6:08 PM.
Sunrise & Sunset with Twilight in September
The figure below presents a compact representation of key lunar data for September 2021. 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.
Moon Rise, Set & Phases in September
The chance that a given day will be muggy in Santa Rosa is rapidly increasing during September, rising from 52% to 70% over the course of the month.
For reference, on January 18, the muggiest day of the year, there are muggy conditions 100% of the time, while on July 31, the least muggy day of the year, there are muggy conditions 47% of the time.
Humidity Comfort Levels in September
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Santa Rosa is essentially constant during September, remaining around 3.4 miles per hour throughout.
For reference, on September 9, the windiest day of the year, the daily average wind speed is 3.4 miles per hour, while on April 15, the calmest day of the year, the daily average wind speed is 2.7 miles per hour.
The highest daily average wind speed during September is 3.4 miles per hour on September 9.
Average Wind Speed in September
The hourly average wind direction in Santa Rosa throughout September is predominantly from the north, with a peak proportion of 44% on September 30.
Wind Direction in September
Temperatures in Santa Rosa 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.
Time Spent in Various Temperature Bands and the Growing Season in September
The average accumulated growing degree days in Santa Rosa are rapidly increasing during September, increasing by 857°F, from 1,602°F to 2,459°F, over the course of the month.
Growing Degree Days in September
The average daily incident shortwave solar energy in Santa Rosa is essentially constant during September, remaining within 0.1 kWh of 5.5 kWh throughout.
Average Daily Incident Shortwave Solar Energy in September
For the purposes of this report, the geographical coordinates of Santa Rosa are -14.167 deg latitude, -66.883 deg longitude, and 548 ft elevation.
The topography within 2 miles of Santa Rosa is essentially flat, with a maximum elevation change of 56 feet and an average elevation above sea level of 548 feet. Within 10 miles is essentially flat (102 feet). Within 50 miles contains only modest variations in elevation (3,068 feet).
The area within 2 miles of Santa Rosa is covered by trees (90%), within 10 miles by trees (30%) and herbaceous vegetation (27%), and within 50 miles by trees (56%) and herbaceous vegetation (16%).
This report illustrates the typical weather in Santa Rosa, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Santa Rosa is further than 200 kilometers from the nearest reliable weather station, so the weather-related data on this page were taken entirely from NASA's MERRA-2 satellite-era reanalysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
The temperature and dew point estimates are corrected for the difference between the reference elevation of the MERRA-2 grid cell and the elevation of Santa Rosa, according to the International Standard Atmosphere .
Time zones for airports and weather stations are provided by AskGeo.com .