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Fall Weather in Cape Cod Massachusetts, United States

Daily high temperatures decrease by 26°F, from 74°F to 48°F, rarely falling below 38°F or exceeding 81°F.

Daily low temperatures decrease by 24°F, from 61°F to 36°F, rarely falling below 26°F or exceeding 67°F.

For reference, on July 21, the hottest day of the year, temperatures in Cape Cod typically range from 65°F to 78°F, while on January 30, the coldest day of the year, they range from 26°F to 37°F.

Average High and Low Temperature in the Fall in Cape Cod

Average High and Low Temperature in the Fall in Cape CodSepOctNov20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°FSummerWinterSep 174°FSep 174°F61°F61°FNov 3048°FNov 3048°F36°F36°FOct 165°FOct 165°F53°F53°FNov 156°FNov 156°F44°F44°F
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the hourly average fall temperatures. 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 the Fall in Cape Cod

Average Hourly Temperature in the Fall in Cape CodSepOctNov12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMSummerWintervery coldcoldcoolcomfortablewarm
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.
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The fall in Cape Cod experiences rapidly increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 37% to 50%. The lowest chance of overcast or mostly cloudy conditions is 37% on September 6.

The clearest day of the fall is September 6, with clear, mostly clear, or partly cloudy conditions 63% of the time.

For reference, on May 24, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 55%, while on September 6, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 63%.

Cloud Cover Categories in the Fall in Cape Cod

Cloud Cover Categories in the Fall in Cape CodSepOctNov0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%SummerWinterMay 2445%May 2445%Sep 163%Sep 163%Nov 3050%Nov 3050%Oct 161%Oct 161%Nov 155%Nov 155%clearmostly clearpartly cloudyovercast
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Cape Cod, the chance of a wet day over the course of the fall is rapidly increasing, starting the season at 24% and ending it at 32%.

For reference, the year's highest daily chance of a wet day is 33% on December 16, and its lowest chance is 24% on September 4.

Over the course of the fall in Cape Cod, the chance of a day with only rain increases from 24% to 30%, the chance of a day with mixed snow and rain increases from 0% to 2%, and the chance of a day with only snow remains an essentially constant 0% throughout.

Probability of Precipitation in the Fall in Cape Cod

Probability of Precipitation in the Fall in Cape CodSepOctNov0%0%5%5%10%10%15%15%20%20%25%25%30%30%35%35%SummerWinterSep 424%Sep 424%Nov 3032%Nov 3032%Oct 127%Oct 127%Nov 128%Nov 128%rainmixedsnow
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

To show variation within the season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during the fall in Cape Cod is rapidly increasing, starting the season at 3.1 inches, when it rarely exceeds 5.4 inches or falls below 1.2 inches, and ending the season at 4.2 inches, when it rarely exceeds 6.8 inches or falls below 1.9 inches.

The highest average 31-day accumulation is 4.2 inches on November 27.

Average Monthly Rainfall in the Fall in Cape Cod

Average Monthly Rainfall in the Fall in Cape CodSepOctNov0 in0 in1 in1 in2 in2 in3 in3 in4 in4 in5 in5 in6 in6 in7 in7 inSummerWinterNov 274.2 inNov 274.2 inSep 13.1 inSep 13.1 inOct 13.7 inOct 13.7 inNov 14.0 inNov 14.0 in
The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average snowfall.

Over the course of the fall in Cape Cod, the length of the day is very rapidly decreasing. From the start to the end of the season, the length of the day decreases by 3 hours, 43 minutes, implying an average daily decrease of 2 minutes, 29 seconds, and weekly decrease of 17 minutes, 22 seconds.

The shortest day of the fall is November 30, with 9 hours, 25 minutes of daylight and the longest day is September 1, with 13 hours, 8 minutes of daylight.

Hours of Daylight and Twilight in the Fall in Cape Cod

Hours of Daylight and Twilight in the Fall in Cape CodSepOctNov0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrSummerWinterSep 2312 hr, 10 minSep 2312 hr, 10 minnightnightdaydayNov 309 hr, 25 minNov 309 hr, 25 minNov 110 hr, 23 minNov 110 hr, 23 min
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise of the fall in Cape Cod is 6:06 AM on September 1 and the latest sunrise is 1 hour, 10 minutes later at 7:16 AM on November 4.

The latest sunset is 7:14 PM on September 1 and the earliest sunset is 3 hours, 3 minutes earlier at 4:11 PM on November 30.

Daylight saving time (DST) ends at 1:00 AM on November 5, 2023, shifting sunrise and sunset to be an hour earlier.

For reference, on June 21, the longest day of the year, the Sun rises at 5:06 AM and sets 15 hours, 12 minutes later, at 8:18 PM, while on December 22, the shortest day of the year, it rises at 7:05 AM and sets 9 hours, 9 minutes later, at 4:14 PM.

Sunrise & Sunset with Twilight and Daylight Saving Time in the Fall in Cape Cod

Sunrise & Sunset with Twilight and Daylight Saving Time in the Fall in Cape CodSepOctNov12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMSummerWinter6:06 AM6:06 AMSep 17:14 PMSep 17:14 PM6:47 AM6:47 AMNov 304:11 PMNov 304:11 PM7:16 AM7:16 AMNov 45:32 PMNov 45:32 PM6:37 AM6:37 AMOct 16:23 PMOct 16:23 PMDSTNov 5DSTNov 5SolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day in the fall. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight saving time are indicated by the 'DST' labels.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth in the Fall in Cape Cod

Solar Elevation and Azimuth in the Fall in Cape CodSepOctNov12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMSummerWinter01020203050600010203040
northeastsouthwest
Solar elevation and azimuth in the the fall of 2023. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for the fall of 2023. 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 the Fall in Cape Cod

Moon Rise, Set & Phases in the Fall in Cape CodSepOctNov12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMSummerWinterAug 12:32 PMAug 12:32 PMAug 165:39 AMAug 165:39 AMAug 309:36 PMAug 309:36 PMSep 149:40 PMSep 149:40 PMSep 295:58 AMSep 295:58 AMOct 141:56 PMOct 141:56 PMOct 284:25 PMOct 284:25 PMNov 134:28 AMNov 134:28 AMNov 274:17 AMNov 274:17 AMDec 126:33 PMDec 126:33 PMDec 267:34 PMDec 267:34 PM8:29 PM8:29 PM6:17 AM6:17 AM7:29 PM7:29 PM6:30 AM6:30 AM6:19 PM6:19 PM6:39 AM6:39 AM6:02 PM6:02 PM5:32 PM5:32 PM3:31 PM3:31 PM7:09 AM7:09 AM6:50 AM6:50 AM3:37 PM3:37 PM
The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The chance that a given day will be muggy in Cape Cod is rapidly decreasing during the fall, falling from 20% to 0% over the course of the season.

For reference, on August 2, the muggiest day of the year, there are muggy conditions 41% of the time, while on December 13, the least muggy day of the year, there are muggy conditions 0% of the time.

Humidity Comfort Levels in the Fall in Cape Cod

Humidity Comfort Levels in the Fall in Cape CodSepOctNov0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%SummerWinterSep 120%Sep 120%Nov 300%Nov 300%Oct 14%Oct 14%Nov 10%Nov 10%muggymuggyhumidhumiddrydryoppressiveoppressivecomfortablecomfortable
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in Cape Cod is very rapidly increasing during the fall, increasing from 10.4 miles per hour to 15.5 miles per hour over the course of the season.

For reference, on January 13, the windiest day of the year, the daily average wind speed is 16.7 miles per hour, while on July 25, the calmest day of the year, the daily average wind speed is 9.5 miles per hour.

Average Wind Speed in the Fall in Cape Cod

Average Wind Speed in the Fall in Cape CodSepOctNov0 mph0 mph5 mph5 mph10 mph10 mph15 mph15 mph20 mph20 mph25 mph25 mphSummerWinterSep 110.4 mphSep 110.4 mphNov 3015.5 mphNov 3015.5 mphOct 112.2 mphOct 112.2 mphNov 114.4 mphNov 114.4 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The wind direction in Cape Cod during the fall is predominantly out of the south from September 1 to October 7 and the west from October 7 to November 30.

Wind Direction in the Fall in Cape Cod

Wind Direction in the Fall in Cape CodSWSepOctNov0%100%20%80%40%60%60%40%80%20%100%0%SummerWinterwestsouthnortheast
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Cape Cod 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 Cape Cod is very rapidly decreasing during the fall, falling by 17°F, from 65°F to 48°F, over the course of the season.

Average Water Temperature in the Fall in Cape Cod

Average Water Temperature in the Fall in Cape CodSepOctNov40°F40°F45°F45°F50°F50°F55°F55°F60°F60°F65°F65°F70°F70°FSummerWinterSep 165°FSep 165°FNov 3048°FNov 3048°FOct 160°FOct 160°FNov 153°FNov 153°F
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

The growing season in Cape Cod typically lasts for 6.9 months (210 days), from around April 15 to around November 11, rarely starting before March 26 or after May 3, and rarely ending before October 22 or after November 30.

During the fall in Cape Cod, the chance that a given day is within the growing season is very rapidly decreasing falling from 100% to 9% over the course of the season.

Time Spent in Various Temperature Bands and the Growing Season in the Fall in Cape Cod

Time Spent in Various Temperature Bands and the Growing Season in the Fall in Cape Codgrowing seasonSepOctNov0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%SummerWinter100%Sep 1100%Sep 1Nov 309%Nov 309%100%Oct 1100%Oct 176%Nov 176%Nov 1freezingvery coldcoldcoolcomfortablewarm
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

The average accumulated growing degree days in Cape Cod are rapidly increasing during the fall, increasing by 625°F, from 1,863°F to 2,488°F, over the course of the season.

Growing Degree Days in the Fall in Cape Cod

Growing Degree Days in the Fall in Cape CodSepOctNov1,800°F1,800°F2,000°F2,000°F2,200°F2,200°F2,400°F2,400°F2,600°F2,600°FSummerWinterSep 11,863°FSep 11,863°FNov 302,488°FNov 302,488°FOct 12,261°FOct 12,261°FNov 12,441°FNov 12,441°F
The average growing degree days accumulated over the course of the fall, with 25th to 75th and 10th to 90th percentile bands.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy in Cape Cod is very rapidly decreasing during the fall, falling by 3.7 kWh, from 5.6 kWh to 1.8 kWh, over the course of the season.

Average Daily Incident Shortwave Solar Energy in the Fall in Cape Cod

Average Daily Incident Shortwave Solar Energy in the Fall in Cape CodSepOctNov0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWhSummerWinterSep 15.6 kWhSep 15.6 kWhNov 301.8 kWhNov 301.8 kWhOct 14.2 kWhOct 14.2 kWhNov 12.8 kWhNov 12.8 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

For the purposes of this report, the geographical coordinates of Cape Cod are 41.686 deg latitude, -70.243 deg longitude, and 0 ft elevation.

The topography within 2 miles of Cape Cod is essentially flat, with a maximum elevation change of 0 feet and an average elevation above sea level of 0 feet. Within 10 miles is also essentially flat (0 feet). Within 50 miles is also essentially flat (0 feet).

The area within 2 miles of Cape Cod is covered by artificial surfaces (53%) and trees (41%), within 10 miles by water (61%) and artificial surfaces (21%), and within 50 miles by water (80%) and trees (12%).

This report illustrates the typical weather in Cape Cod, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

The details of the data sources used for this report can be found on the Provincetown Municipal Airport page.

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