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September Weather in Martha's Vineyard Island Massachusetts, United States

Daily high temperatures decrease by 8°F, from 75°F to 67°F, rarely falling below 59°F or exceeding 81°F.

Daily low temperatures decrease by 8°F, from 59°F to 52°F, rarely falling below 41°F or exceeding 69°F.

For reference, on July 24, the hottest day of the year, temperatures in Martha's Vineyard Island typically range from 64°F to 79°F, while on January 30, the coldest day of the year, they range from 24°F to 38°F.

Average High and Low Temperature in September in Martha's Vineyard Island

Average High and Low Temperature in September in Martha's Vineyard IslandSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303030°F30°F35°F35°F40°F40°F45°F45°F50°F50°F55°F55°F60°F60°F65°F65°F70°F70°F75°F75°F80°F80°F85°F85°FAugOctSep 175°FSep 175°F59°F59°FSep 3067°FSep 3067°F52°F52°FSep 1173°FSep 1173°F57°F57°FSep 2170°FSep 2170°F55°F55°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 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 in Martha's Vineyard Island

Average Hourly Temperature in September in Martha's Vineyard IslandSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 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 AMAugOctcoldcoldcoolcomfortablewarm
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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© OpenStreetMap contributors

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The month of September in Martha's Vineyard Island experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 38% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 37% on September 5.

The clearest day of the month is September 5, with clear, mostly clear, or partly cloudy conditions 63% of the time.

For reference, on May 23, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 53%, while on September 5, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 63%.

Cloud Cover Categories in September in Martha's Vineyard Island

Cloud Cover Categories in September in Martha's Vineyard IslandSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AugOctMay 2347%May 2347%Sep 163%Sep 163%Sep 3061%Sep 3061%Sep 1162%Sep 1162%Sep 2162%Sep 2162%clearmostly clearpartly cloudymostly 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 Martha's Vineyard Island, the chance of a wet day over the course of September is gradually increasing, starting the month at 23% and ending it at 26%.

For reference, the year's highest daily chance of a wet day is 31% on December 10, and its lowest chance is 21% on July 3.

Probability of Precipitation in September in Martha's Vineyard Island

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 month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during September in Martha's Vineyard Island is gradually increasing, starting the month at 3.1 inches, when it rarely exceeds 5.7 inches or falls below 1.1 inches, and ending the month at 3.5 inches, when it rarely exceeds 6.1 inches or falls below 1.2 inches.

Average Monthly Rainfall in September in Martha's Vineyard Island

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 September in Martha's Vineyard Island, 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, 19 minutes, implying an average daily decrease of 2 minutes, 43 seconds, and weekly decrease of 19 minutes, 3 seconds.

The shortest day of the month is September 30, with 11 hours, 46 minutes of daylight and the longest day is September 1, with 13 hours, 5 minutes of daylight.

Hours of Daylight and Twilight in September in Martha's Vineyard Island

Hours of Daylight and Twilight in September in Martha's Vineyard IslandSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrAugOctSep 2212 hr, 11 minSep 2212 hr, 11 minnightnightdaydaySep 113 hr, 5 minSep 113 hr, 5 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 month in Martha's Vineyard Island is 6:09 AM on September 1 and the latest sunrise is 29 minutes later at 6:38 AM on September 30.

The latest sunset is 7:14 PM on September 1 and the earliest sunset is 49 minutes earlier at 6:25 PM on September 30.

Daylight saving time is observed in Martha's Vineyard Island during 2024, but it neither starts nor ends during September, so the entire month is in standard time.

For reference, on June 20, the longest day of the year, the Sun rises at 5:08 AM and sets 15 hours, 11 minutes later, at 8:19 PM, while on December 21, the shortest day of the year, it rises at 7:05 AM and sets 9 hours, 11 minutes later, at 4:16 PM.

Sunrise & Sunset with Twilight in September in Martha's Vineyard Island

Sunrise & Sunset with Twilight in September in Martha's Vineyard IslandSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930302 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMAugOct6:09 AM6:09 AMSep 17:14 PMSep 17:14 PM6:38 AM6:38 AMSep 306:25 PMSep 306:25 PM6:19 AM6:19 AMSep 116:57 PMSep 116:57 PMSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of September. 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 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 September in Martha's Vineyard Island

Solar Elevation and Azimuth in September in Martha's Vineyard IslandSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 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 AMAugOct0010102020203030404050500001010202030303040405060
northeastsouthwest
Solar elevation and azimuth over the course of September 2024. 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 September 2024. 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 in Martha's Vineyard Island

Moon Rise, Set & Phases in September in Martha's Vineyard IslandSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMAugOctAug 47:14 AMAug 47:14 AMAug 192:26 PMAug 192:26 PMSep 29:56 PMSep 29:56 PMSep 1710:35 PMSep 1710:35 PMOct 22:50 PMOct 22:50 PMOct 177:27 AMOct 177:27 AM5:29 AM5:29 AM8:27 PM8:27 PM7:53 PM7:53 PM6:45 AM6:45 AM5:30 AM5:30 AM7:17 PM7:17 PM6:43 PM6:43 PM6:55 AM6:55 AM6:25 AM6:25 AM6:18 PM6:18 PM5:30 PM5:30 PM7:03 AM7:03 AM
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.
Sep 2024IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
2%4:25 AMENE6:56 PMWNW-11:45 AMS249,110 mi
2
0%5:30 AMENE7:17 PMWNW-12:27 PMS250,521 mi
3
0%6:32 AME7:36 PMW-1:06 PMS251,572 mi
4
2%7:33 AME7:53 PMW-1:45 PMS252,220 mi
5
6%8:33 AME8:12 PMW-2:23 PMS252,401 mi
6
12%9:33 AMESE8:31 PMWSW-3:03 PMS252,042 mi
7
19%10:35 AMESE8:53 PMWSW-3:44 PMS251,068 mi
8
27%11:39 AMESE9:18 PMWSW-4:29 PMS249,421 mi
9
37%12:44 PMESE9:50 PMSW-5:17 PMS247,078 mi
10
47%1:50 PMSE10:31 PMSW-6:10 PMS244,068 mi
11
50%2:53 PMSE11:22 PMSW-7:07 PMS240,495 mi
12
68%3:49 PMSE--8:07 PMS236,545 mi
13
78%-12:24 AMSW4:38 PMSE9:07 PMS232,492 mi
14
87%-1:37 AMSW5:17 PMESE10:06 PMS228,676 mi
15
94%-2:55 AMWSW5:50 PMESE11:02 PMS225,461 mi
16
99%-4:15 AMWSW6:18 PMESE11:55 PMS223,183 mi
17
100%-5:35 AMW6:43 PME--
18
100%-6:55 AMW7:07 PME12:47 AMS222,086 mi
19
98%-8:14 AMW7:32 PMENE1:37 AMS222,282 mi
20
93%-9:35 AMWNW8:00 PMENE2:29 AMS223,724 mi
21
85%-10:55 AMWNW8:33 PMENE3:22 AMS226,221 mi
22
76%-12:14 PMNW9:13 PMNE4:18 AMS229,480 mi
23
65%-1:27 PMNW10:02 PMNE5:17 AMS233,163 mi
24
50%-2:30 PMNW11:00 PMNE6:16 AMS236,942 mi
25
43%-3:22 PMNW-7:13 AMS240,544 mi
26
33%12:04 AMNE4:03 PMNW-8:07 AMS243,776 mi
27
23%1:11 AMENE4:35 PMWNW-8:58 AMS246,523 mi
28
15%2:17 AMENE5:01 PMWNW-9:44 AMS248,740 mi
29
9%3:22 AMENE5:23 PMWNW-10:26 AMS250,426 mi
30
4%4:24 AMENE5:42 PMW-11:06 AMS251,609 mi

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 Martha's Vineyard Island is very rapidly decreasing during September, falling from 29% to 9% over the course of the month.

For reference, on August 1, the muggiest day of the year, there are muggy conditions 53% 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 in Martha's Vineyard Island

Humidity Comfort Levels in September in Martha's Vineyard IslandSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%AugOctSep 129%Sep 129%Sep 309%Sep 309%Sep 1123%Sep 1123%Sep 2115%Sep 2115%oppressiveoppressivemuggymuggyhumidhumidcomfortablecomfortabledrydry
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 Martha's Vineyard Island is increasing during September, increasing from 11.9 miles per hour to 13.8 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 17.5 miles per hour, while on July 24, the calmest day of the year, the daily average wind speed is 11.2 miles per hour.

Average Wind Speed in September in Martha's Vineyard Island

Average Wind Speed in September in Martha's Vineyard IslandSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 mph0 mph5 mph5 mph10 mph10 mph15 mph15 mph20 mph20 mph25 mph25 mphAugOctSep 111.9 mphSep 111.9 mphSep 3013.8 mphSep 3013.8 mphSep 1612.8 mphSep 1612.8 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 Martha's Vineyard Island during September is predominantly out of the west from September 1 to September 4 and from September 15 to September 30 and the south from September 4 to September 15.

Wind Direction in September in Martha's Vineyard Island

Wind Direction in September in Martha's Vineyard IslandSWSWSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%20%80%40%60%60%40%80%20%100%0%AugOctwestsouthnortheast
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).

Martha's Vineyard Island 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 Martha's Vineyard Island is decreasing during September, falling by 4°F, from 67°F to 63°F, over the course of the month.

Average Water Temperature in September in Martha's Vineyard Island

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 Martha's Vineyard Island typically lasts for 6.2 months (190 days), from around April 24 to around October 31, rarely starting before April 2 or after May 14, and rarely ending before October 12 or after November 18.

The month of September in Martha's Vineyard Island is reliably fully within the growing season.

Time Spent in Various Temperature Bands and the Growing Season in September in Martha's Vineyard Island

Time Spent in Various Temperature Bands and the Growing Season in September in Martha's Vineyard Islandgrowing seasonSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AugOct100%Sep 16100%Sep 1650%Oct 3150%Oct 3190%Oct 1290%Oct 12very 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 Martha's Vineyard Island are increasing during September, increasing by 405°F, from 1,957°F to 2,362°F, over the course of the month.

Growing Degree Days in September in Martha's Vineyard Island

Growing Degree Days in September in Martha's Vineyard IslandSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930301,800°F1,800°F1,900°F1,900°F2,000°F2,000°F2,100°F2,100°F2,200°F2,200°F2,300°F2,300°F2,400°F2,400°F2,500°F2,500°F2,600°F2,600°FAugOctSep 11,957°FSep 11,957°FSep 302,362°FSep 302,362°FSep 112,117°FSep 112,117°F
The average growing degree days accumulated over the course of September, 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 Martha's Vineyard Island is decreasing during September, falling by 1.3 kWh, from 5.6 kWh to 4.3 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in September in Martha's Vineyard Island

Average Daily Incident Shortwave Solar Energy in September in Martha's Vineyard IslandSep1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWhAugOctSep 15.6 kWhSep 15.6 kWhSep 304.3 kWhSep 304.3 kWhSep 115.2 kWhSep 115.2 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 Martha's Vineyard Island are 41.417 deg latitude, -70.616 deg longitude, and 0 ft elevation.

The topography within 2 miles of Martha's Vineyard Island 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 Martha's Vineyard Island is covered by trees (88%), within 10 miles by water (72%) and trees (23%), and within 50 miles by water (77%) and trees (13%).

This report illustrates the typical weather in Martha's Vineyard Island, 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 Martha's Vineyard Airport page.

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The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

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