Average Weather in September in Jonesport Maine, United States
Daily high temperatures decrease by 8°F, from 68°F to 60°F, rarely falling below 54°F or exceeding 74°F.
Daily low temperatures decrease by 7°F, from 54°F to 47°F, rarely falling below 39°F or exceeding 61°F.
For reference, on July 27, the hottest day of the year, temperatures in Jonesport typically range from 57°F to 71°F, while on January 29, the coldest day of the year, they range from 17°F to 31°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 Jonesport experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 40% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 38% on September 3.
The clearest day of the month is September 3, with clear, mostly clear, or partly cloudy conditions 62% of the time.
For reference, on May 17, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 61%, while on September 3, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 62%.
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 Jonesport, the chance of a wet day over the course of September is rapidly increasing, starting the month at 23% and ending it at 29%.
For reference, the year's highest daily chance of a wet day is 35% on December 11, and its lowest chance is 22% on August 30.
Probability of Precipitation in September
The average sliding 31-day rainfall during September in Jonesport is increasing, starting the month at 2.8 inches, when it rarely exceeds 4.9 inches or falls below 1.2 inches, and ending the month at 3.7 inches, when it rarely exceeds 6.6 inches or falls below 1.6 inches.
Average Monthly Rainfall in September
Over the course of September in Jonesport, 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, 28 minutes, implying an average daily decrease of 3 minutes, 2 seconds, and weekly decrease of 21 minutes, 16 seconds.
The shortest day of the month is September 30, with 11 hours, 45 minutes of daylight and the longest day is September 1, with 13 hours, 13 minutes of daylight.
Hours of Daylight and Twilight in September
The earliest sunrise of the month in Jonesport is 5:53 AM on September 1 and the latest sunrise is 34 minutes later at 6:27 AM on September 30.
The latest sunset is 7:06 PM on September 1 and the earliest sunset is 54 minutes earlier at 6:12 PM on September 30.
Daylight saving time is observed in Jonesport during 2021, 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 4:45 AM and sets 15 hours, 33 minutes later, at 8:18 PM, while on December 21, the shortest day of the year, it rises at 7:03 AM and sets 8 hours, 49 minutes later, at 3:53 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 Jonesport is essentially constant during September, remaining within 1% of 1% throughout.
For reference, on August 3, the muggiest day of the year, there are muggy conditions 4% 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
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Jonesport is increasing during September, increasing from 8.0 miles per hour to 9.7 miles per hour over the course of the month.
For reference, on January 13, the windiest day of the year, the daily average wind speed is 13.5 miles per hour, while on August 8, the calmest day of the year, the daily average wind speed is 7.3 miles per hour.
Average Wind Speed in September
The hourly average wind direction in Jonesport throughout September is predominantly from the south, with a peak proportion of 35% on September 1.
Wind Direction in September
Jonesport 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 Jonesport is gradually decreasing during September, falling by 2°F, from 55°F to 53°F, over the course of the month.
Average Water Temperature in September
The growing season in Jonesport typically lasts for 6.2 months (190 days), from around April 24 to around October 31, rarely starting before April 7 or after May 11, and rarely ending before October 13 or after November 17.
The month of September in Jonesport is reliably fully within the growing season.
Time Spent in Various Temperature Bands and the Growing Season in September
The average accumulated growing degree days in Jonesport are increasing during September, increasing by 231°F, from 1,091°F to 1,322°F, over the course of the month.
Growing Degree Days in September
The average daily incident shortwave solar energy in Jonesport is decreasing during September, falling by 1.5 kWh, from 5.4 kWh to 3.9 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 Jonesport are 44.533 deg latitude, -67.598 deg longitude, and 3 ft elevation.
The topography within 2 miles of Jonesport contains only modest variations in elevation, with a maximum elevation change of 108 feet and an average elevation above sea level of 20 feet. Within 10 miles also contains only modest variations in elevation (233 feet). Within 50 miles contains only modest variations in elevation (1,529 feet).
The area within 2 miles of Jonesport is covered by water (41%), trees (32%), and herbaceous vegetation (25%), within 10 miles by water (68%) and trees (28%), and within 50 miles by water (60%) and trees (37%).
This report illustrates the typical weather in Jonesport, 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 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Jonesport.
For each station, the records are corrected for the elevation difference between that station and Jonesport 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 Jonesport is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Jonesport and a given station.
The stations contributing to this reconstruction are: Hancock County-Bar Harbor Airport (47%, 62 kilometers, west); St. Stephen, N. B. (31%, 81 kilometers, north); and Brier Island, N. S. (22%, 103 kilometers, east).
Time zones for airports and weather stations are provided by AskGeo.com .