Average Weather in September in San Francisco del Mar Viejo Mexico
Daily high temperatures are around 91°F, rarely falling below 87°F or exceeding 95°F.
Daily low temperatures are around 80°F, rarely falling below 77°F or exceeding 82°F. The lowest daily average low temperature is 79°F on September 11.
For reference, on July 29, the hottest day of the year, temperatures in San Francisco del Mar Viejo typically range from 81°F to 93°F, while on January 17, the coldest day of the year, they range from 75°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
Camocim, Brazil (3,906 miles away); Eravur Town, Sri Lanka (10,770 miles); and Samut Prakan, Thailand (10,139 miles) are the far-away foreign places with temperatures most similar to San Francisco del Mar Viejo (view comparison).
The month of September in San Francisco del Mar Viejo experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 92% to 88%. The highest chance of overcast or mostly cloudy conditions is 93% on September 15.
The clearest day of the month is September 30, with clear, mostly clear, or partly cloudy conditions 12% of the time.
For reference, on September 7, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 93%, while on February 14, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 79%.
Cloud Cover Categories in September
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In San Francisco del Mar Viejo, the chance of a wet day over the course of September is very rapidly decreasing, starting the month at 61% and ending it at 47%.
For reference, the year's highest daily chance of a wet day is 63% on September 11, and its lowest chance is 1% on January 29.
Probability of Precipitation in September
The average sliding 31-day rainfall during September in San Francisco del Mar Viejo is very rapidly decreasing, starting the month at 8.9 inches, when it rarely exceeds 17.0 inches or falls below 2.9 inches, and ending the month at 6.5 inches, when it rarely exceeds 12.4 inches or falls below 2.5 inches.
The highest average 31-day accumulation is 9.1 inches on September 7.
Average Monthly Rainfall in September
Over the course of September in San Francisco del Mar Viejo, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 26 minutes, implying an average daily decrease of 54 seconds, and weekly decrease of 6 minutes, 17 seconds.
The shortest day of the month is September 30, with 11 hours, 60 minutes of daylight and the longest day is September 1, with 12 hours, 26 minutes of daylight.
Hours of Daylight and Twilight in September
The earliest sunrise of the month in San Francisco del Mar Viejo is 7:05 AM on September 1 and the latest sunrise is 2 minutes, 60 seconds later at 7:08 AM on September 30.
The latest sunset is 7:31 PM on September 1 and the earliest sunset is 23 minutes earlier at 7:08 PM on September 30.
Daylight saving time is observed in San Francisco del Mar Viejo 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 6:47 AM and sets 13 hours, 6 minutes later, at 7:53 PM, while on December 21, the shortest day of the year, it rises at 6:41 AM and sets 11 hours, 10 minutes later, at 5:51 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in September
The chance that a given day will be muggy in San Francisco del Mar Viejo is essentially constant during September, remaining around 100% throughout.
For reference, on June 1, the muggiest day of the year, there are muggy conditions 100% of the time, while on January 15, the least muggy day of the year, there are muggy conditions 83% of the time.
Humidity Comfort Levels in September
The average hourly wind speed in San Francisco del Mar Viejo is rapidly increasing during September, increasing from 9.1 miles per hour to 11.5 miles per hour over the course of the month.
For reference, on January 1, the windiest day of the year, the daily average wind speed is 17.3 miles per hour, while on June 21, the calmest day of the year, the daily average wind speed is 8.1 miles per hour.
Average Wind Speed in September
Wind Direction in September
San Francisco del Mar Viejo 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 San Francisco del Mar Viejo is essentially constant during September, remaining within 1°F of 85°F throughout.
Average Water Temperature in September
Temperatures in San Francisco del Mar Viejo 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 San Francisco del Mar Viejo are very rapidly increasing during September, increasing by 972°F, from 7,927°F to 8,899°F, over the course of the month.
Growing Degree Days in September
The average daily incident shortwave solar energy in San Francisco del Mar Viejo is essentially constant during September, remaining within 0.2 kWh of 4.4 kWh throughout.
The lowest average daily incident shortwave solar energy during September is 4.3 kWh on September 7.
Average Daily Incident Shortwave Solar Energy in September
For the purposes of this report, the geographical coordinates of San Francisco del Mar Viejo are 16.232 deg latitude, -94.633 deg longitude, and 0 ft elevation.
The topography within 2 miles of San Francisco del Mar Viejo contains only modest variations in elevation, with a maximum elevation change of 328 feet and an average elevation above sea level of 25 feet. Within 10 miles contains only modest variations in elevation (728 feet). Within 50 miles contains significant variations in elevation (7,520 feet).
The area within 2 miles of San Francisco del Mar Viejo is covered by mangroves (48%), water (24%), and cropland (17%), within 10 miles by water (70%) and cropland (15%), and within 50 miles by water (48%) and cropland (31%).
This report illustrates the typical weather in San Francisco del Mar Viejo 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 2 weather stations near enough to contribute to our estimation of the temperature and dew point in San Francisco del Mar Viejo.
For each station, the records are corrected for the elevation difference between that station and San Francisco del Mar Viejo 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 San Francisco del Mar Viejo is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between San Francisco del Mar Viejo and a given station.
Time zones for aiports and weather stations are provided by AskGeo.com .