September weather forecast and climate
Harwich Port, MA

Weather in September

September, the first month of the autumn, in Harwich Port, is also an enjoyable month, with average temperature varying between 66.6°F (19.2°C) and 63.3°F (17.4°C).

Temperature

In September, the average high-temperature is almost the same as in August - a comfortable 66.6°F (19.2°C). In September, the average low-temperature is 63.3°F (17.4°C).

Humidity

In Harwich Port, the average relative humidity is 80%.

Rainfall

In Harwich Port, during September, the rain falls for 10.7 days and regularly aggregates up to 1.85" (47mm) of precipitation. Throughout the year, there are 142.4 rainfall days, and 22.09" (561mm) of precipitation is accumulated.

Snowfall

In Harwich Port snow does not fall in May through October.

Ocean temperature

In September, the average ocean temperature in Harwich Port is 64.2°F (17.9°C).
Note: For swimming, a surface water temperature of 64.2°F (17.9°C) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 69.8°F (21°C).

Daylight

In September, the average length of the day is 12.5h.

Sunshine

The average sunshine in September is 8.5h.

UV index

In September, the average daily maximum UV index in Harwich Port, Massachusetts, is 4. A UV Index reading of 3 to 5 represents a medium health hazard from the exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 4 interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the average humidity in September in Harwich Port?

In September, the average relative humidity in Harwich Port is 80%.

How much does it rain in Harwich Port in September?

In Harwich Port, during September, the rain falls for 10.7 days and regularly aggregates up to 1.85" (47mm) of precipitation.

When it does not snow in Harwich Port?

May through October are months without snowfall.

What is the ocean temperature in September in Harwich Port?

In Harwich Port, in September, the average water temperature is 64.2°F (17.9°C). For most, swimming in 64.2°F (17.9°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

How many hours of daylight does Harwich Port have in September?

In Harwich Port, Massachusetts, the average length of the day in September is 12.5h.

How long on average sun shines in September in Harwich Port?

In Harwich Port, the average sunshine in September is 8.5h.

What is the UV index intensity in September in Harwich Port?

In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a medium health risk from unsafe exposure to the Sun's UV rays.

Average temperature in September
Harwich Port, MA

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

The warmest month (with the highest average high temperature) is August (71.6°F).
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).

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Average pressure in September
Harwich Port, MA

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

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

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Average wind speed in September
Harwich Port, MA

Average wind speed in September - Harwich Port, 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).

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Average humidity in September
Harwich Port, MA

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

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

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Average rainfall in September
Harwich Port, MA

Average rainfall in September - Harwich Port, 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").

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Average rainfall days in September
Harwich Port, MA

Average rainfall days in September - Harwich Port, 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).

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Average snowfall in September
Harwich Port, MA

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

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

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Average snowfall days in September
Harwich Port, MA

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

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

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Average sea temperature in September
Harwich Port, MA

Average sea temperature in September - Harwich Port, MA
  • Average sea temperature in September: 64.3°F

The best month for swimming (with the highest average sea temperature) is August (67.5°F).
The coldest month (with the lowest average sea temperature) is March (39°F).

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

Average daylight in September / Average sunshine in September - Harwich Port, MA
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.2h).
The month with the shortest days is December (Average daylight: 9.2h).

  • Average sunshine in September: 8.5h

The month with the most sunshine is August (Average sunshine: 10.7h).
The month with the least sunshine is December (Average sunshine: 4.3h).

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Average sunshine days in September
Harwich Port, MA

Average sunshine days in September - Harwich Port, 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).

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Average UV index in September
Harwich Port, MA

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

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

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Average cloud cover in September
Harwich Port, MA

Average cloud cover in September - Harwich Port, 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).

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Average visibility in September
Harwich Port, MA

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

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

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