Average Weather in September in Puntarenas Costa Rica
In Puntarenas, the month of September is characterized by essentially constant daily high temperatures, with daily highs around 90°F throughout the month, rarely exceeding 95°F or dropping below 86°F.
Daily low temperatures are around 77°F, rarely falling below 74°F or exceeding 80°F.
For reference, on March 22, the hottest day of the year, temperatures in Puntarenas typically range from 79°F to 97°F, while on October 7, the coldest day of the year, they range from 77°F to 89°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 Puntarenas experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 91% throughout the month. The highest chance of overcast or mostly cloudy conditions is 91% on September 29.
The clearest day of the month is September 14, with clear, mostly clear, or partly cloudy conditions 10% of the time.
For reference, on June 5, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 93%, while on January 1, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 68%.
Cloud Cover Categories in September
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Puntarenas, the chance of a wet day over the course of September is increasing, starting the month at 40% and ending it at 46%.
For reference, the year's highest daily chance of a wet day is 46% on October 7, and its lowest chance is 2% on January 28.
Probability of Precipitation in September
The average sliding 31-day rainfall during September in Puntarenas is rapidly increasing, starting the month at 5.7 inches, when it rarely exceeds 10.8 inches or falls below 1.8 inches, and ending the month at 6.9 inches, when it rarely exceeds 13.9 inches or falls below 2.1 inches.
The highest average 31-day accumulation is 6.9 inches on September 29.
Average Monthly Rainfall in September
Over the course of September in Puntarenas, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 16 minutes, implying an average daily decrease of 33 seconds, and weekly decrease of 3 minutes, 48 seconds.
The shortest day of the month is September 30, with 12 hours, 2 minutes of daylight and the longest day is September 1, with 12 hours, 18 minutes of daylight.
Hours of Daylight and Twilight in September
The latest sunrise of the month in Puntarenas is 5:30 AM on September 1 and the earliest sunrise is 2 minutes, 9 seconds earlier at 5:27 AM on September 30.
The latest sunset is 5:48 PM on September 1 and the earliest sunset is 18 minutes earlier at 5:30 PM on September 30.
Daylight saving time is not observed in Puntarenas during 2017.
For reference, on June 21, the longest day of the year, the Sun rises at 5:19 AM and sets 12 hours, 43 minutes later, at 6:02 PM, while on December 21, the shortest day of the year, it rises at 5:51 AM and sets 11 hours, 33 minutes later, at 5:23 PM.
Sunrise & Sunset with Twilight in September
The chance that a given day will be muggy in Puntarenas is essentially constant during September, remaining around 99% throughout.
The highest chance of a muggy day during September is 100% on September 29.
For reference, on September 29, the muggiest day of the year, there are muggy conditions 100% of the time, while on February 10, the least muggy day of the year, there are muggy conditions 39% of the time.
Humidity Comfort Levels in September
The average hourly wind speed in Puntarenas is essentially constant during September, remaining within 0.2 miles per hour of 4.9 miles per hour throughout.
For reference, on February 5, the windiest day of the year, the daily average wind speed is 7.8 miles per hour, while on June 25, the calmest day of the year, the daily average wind speed is 4.5 miles per hour.
Average Wind Speed in September
Wind Direction in September
Puntarenas 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 Puntarenas is essentially constant during September, remaining around 83°F throughout.
Average Water Temperature in September
Temperatures in Puntarenas 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 Puntarenas is very rapidly increasing during September, increasing by 914°F, from 8,028°F to 8,942°F, over the course of the month.
Growing Degree Days in September
The average daily incident shortwave solar energy in Puntarenas is essentially constant during September, remaining within 0.1 kWh of 4.0 kWh throughout.
Average Daily Incident Shortwave Solar Energy in September
For the purposes of this report, the geographical coordinates of Puntarenas are 9.976 deg latitude, -84.838 deg longitude, and 0 ft elevation.
The topography within 2 miles of Puntarenas contains only modest variations in elevation, with a maximum elevation change of 102 feet and an average elevation above sea level of 10 feet. Within 10 miles contains only modest variations in elevation (1,385 feet). Within 50 miles contains very significant variations in elevation (8,917 feet).
The area within 2 miles of Puntarenas is covered by water (73%) and mangroves (19%), within 10 miles by water (55%) and grassland (18%), and within 50 miles by water (35%) and trees (30%).
This report illustrates the typical weather in Puntarenas 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 is only a single weather station, Juan Santamaría International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Puntarenas.
At a distance of 69 kilometers from Puntarenas, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records.
The station records are corrected for the elevation difference between the station and Puntarenas according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis.
Time zones for aiports and weather stations are provided by AskGeo.com .