September weather forecast
East Harwich, MA

Share

Weather in September

The first month of the autumn, September, is still a comfortable month in East Harwich, Massachusetts, with an average temperature ranging between max 66.6°F (19.2°C) and min 63.3°F (17.4°C).

Temperature

The onset of September notes an average high-temperature of a comfortable 66.6°F (19.2°C), subtly shifted from August's 71.6°F (22°C). In September, East Harwich's nighttime temperatures demonstrate a slight decrease, stabilizing at an average of 63.3°F (17.4°C).

Humidity

In September, the average relative humidity is 80%.

Rainfall

In September, the rain falls for 10.7 days. Throughout September, 1.85" (47mm) of precipitation is accumulated. In East Harwich, during the entire year, the rain falls for 142.4 days and collects up to 22.09" (561mm) of precipitation.

Snowfall

In East Harwich, snow does not fall in May through October.

Daylight

The average length of the day in September in East Harwich is 12h and 28min.
On the first day of the month, sunrise is at 6:06 am and sunset at 7:12 pm. On the last day of September, sunrise is at 6:36 am and sunset at 6:23 pm EDT.

Sunshine

In September, the average sunshine is 8.5h.

UV index

The average daily maximum UV index in September in East Harwich is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In September, the average maximum UV index of 4 translates into the following recommendations:
Take heed. Individuals of lighter complexion can be burned in less than half an hour. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
Updated: Aug 13, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the usual temperature for East Harwich in September?

East Harwich in September has an average high-temperature of 66.6°F (19.2°C) and an average low-temperature of 63.3°F (17.4°C).

What is the average humidity in September?

In September, the average relative humidity is 80%.

How much does it rain in September?

In September, the rain falls for 10.7 days. Throughout September, 1.85" (47mm) of precipitation is accumulated.

When it does not snow?

May through October are months without snowfall.

What is the average length of the day in September?

In September, the average day length in East Harwich is 12h and 28min.

What time are sunrise and sunset in September?

On the first day of September, sunrise is at 6:06 am and sunset at 7:12 pm. On the last day of the month, sunrise is at 6:36 am and sunset at 6:23 pm EDT.

How long on average sun shines in September?

In September, the average sunshine duration is 8.5h.

What is the UV index reading in September in East Harwich?

In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium hazard to health from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
East Harwich, MA

Average temperature in September - East Harwich, MA
  • Average high temperature in September: 66.6°F

The warmest month (with the highest average high temperature) is August (71.6°F).
The months with the lowest average high temperature are January and February (39°F).

  • Average low temperature in September: 63.3°F

The month with the highest average low temperature is August (68.2°F).
The coldest month (with the lowest average low temperature) is January (31.6°F).

Average pressure in September
East Harwich, MA

Average pressure in September - East Harwich, MA
  • Average pressure in September: 30.05"Hg

The month with the highest atmospheric pressure is November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed in September
East Harwich, MA

Average wind speed in September - East Harwich, MA
  • Average wind speed in September: 13.5mph

The windiest month (with the highest average wind speed) is January (18mph).
The calmest month (with the lowest average wind speed) is August (11.4mph).

Average humidity in September
East Harwich, MA

Average humidity in September - East Harwich, MA
  • Average humidity in September: 80%

The months with the highest relative humidity are June and July (85%).
The month with the lowest relative humidity is November (74%).

Average rainfall in September
East Harwich, MA

Average rainfall in September - East Harwich, MA
  • Average rainfall in September: 1.85"

The wettest month (with the highest rainfall) is October (2.83").
The driest month (with the least rainfall) is November (1.46").

Average rainfall days in September
East Harwich, MA

Average rainfall days in September - East Harwich, MA
  • Average rainfall days in September: 10.7 days

The month with the highest number of rainy days is May (14.6 days).
The month with the least rainy days is February (8.3 days).

Average snowfall in September
East Harwich, MA

Average snowfall in September - East Harwich, MA
  • Average snowfall in September: 0"

The month with the highest snowfall is February (1.38").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
East Harwich, MA

Average snowfall days in September - East Harwich, MA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (6 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight in September /
Average sunshine in September
East Harwich, MA

Average daylight in September / Average sunshine in September - East Harwich, MA
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in September: 8h and 3min

The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 4h and 18min).

Average sunshine days in September
East Harwich, MA

Average sunshine days in September - East Harwich, MA
  • Average sunshine days in September: 16.9 days

The month with the most sunshine days is August (17.6 days).
The month with the least sunshine days is January (13 days).

Average UV index in September
East Harwich, MA

Average UV index in September - East Harwich, MA
  • Average UV index in September: 4

The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

Average cloud cover in September
East Harwich, MA

Average cloud cover in September - East Harwich, MA
  • Average cloud cover in September: 32

The month with the most cloud cover is December (Cloud cover 54).
The month with the least cloud cover is August (Cloud cover 27).

Average visibility in September
East Harwich, MA

Average visibility in September - East Harwich, MA
  • Average visibility in September: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

East Harwich, Massachusetts, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location