Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average sea temperature in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
On the advent of September, Harwich Port's average high-temperature exhibits a minor adjustment to a comfortable 66.6°F (19.2°C) from August's 71.6°F (22°C). The nights of September anticipate a slight dip from daytime high temperatures, settling to an average low-temperature of 63.3°F (17.4°C).Humidity
In Harwich Port, the average relative humidity in September 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. In Harwich Port, during the entire year, the rain falls for 142.4 days and collects up to 22.09" (561mm) of precipitation.Snowfall
In Harwich Port, snow does not fall in May through October.Ocean temperature
In Harwich Port, the average seawater temperature in September is 64.2°F (17.9°C).Note: For the majority of people, swimming in water at 64.2°F (17.9°C) is not enjoyable. The challenge of controlling breathing escalates as the temperature decreases from 69.8°F (21°C) to 59°F (15°C).
Daylight
In September, the average length of the day is 12h and 28min.On the first day of the month, sunrise is at 6:06 am and sunset at 7:13 pm. On the last day of September, sunrise is at 6:36 am and sunset at 6:23 pm EDT.
Sunshine
In Harwich Port, Massachusetts, the average sunshine in September is 8.5h.UV index
In Harwich Port, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: The maximum daily UV index of 4 during September translates into the following directions:
Heed the precautions - Suggestions to avoid sunburn are made. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in September?
What is the average humidity in September in Harwich Port?
How much does it rain in September?
When it does not snow in Harwich Port?
How cold is the water in September?
How many hours of daylight does Harwich Port have in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Harwich Port have in September?
What is the UV index reading in September?
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).
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
Harwich Port, 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
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).
Average humidity in September
Harwich Port, 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
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").
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).
Average snowfall in September
Harwich Port, 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
Harwich Port, 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 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).
Average daylight in September /
Average sunshine in September
Harwich Port, 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
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).
Average UV index in September
Harwich Port, 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
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).
Average visibility in September
Harwich Port, 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).
Harwich Port, Massachusetts, USA
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