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
With the arrival of September, Falmouth experiences a modest decline in average high-temperatures, transitioning from a warm 73.9°F (23.3°C) in August to an agreeable 68.4°F (20.2°C). A minor drop in temperature is observed from daytime highs during the nights of September, averaging a refreshing 62.4°F (16.9°C).Humidity
In Falmouth, the average relative humidity in September is 79%.Rainfall
July through September are months with the least rain when the rain falls for 4.6 days and typically aggregates up to 0.31" (8mm) of rain.Snowfall
April through November are months without snowfall.Ocean temperature
In Falmouth, the average seawater temperature in September is 65.8°F (18.8°C).Note: A surface water temperature of 65.8°F (18.8°C) does not provide an enjoyable swimming experience for most. Breathing control becomes more challenging as the water temperature drops below 69.8°F (21°C).
Daylight
In Falmouth, the average length of the day in September is 12h and 28min.On the first day of September, sunrise is at 6:09 am and sunset at 7:15 pm. On the last day of the month, sunrise is at 6:38 am and sunset at 6:25 pm EDT.
Sunshine
In September, the average sunshine is 8.6h.UV index
In Falmouth, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for the ordinary person.Note: The maximum UV index, 5 during September, leads to the following recommendations:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures?
What is the average humidity in September?
What is the driest month?
How much does it rain in September?
When it does not snow?
What is the ocean temperature in September?
How many hours of daylight does Falmouth have in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Falmouth have in September?
What is the UV index reading in September?
Average temperature in September
Falmouth, MA
- Average high temperature in September: 68.4°F
The warmest month (with the highest average high temperature) is August (73.9°F).
The month with the lowest average high temperature is January (37.9°F).
- Average low temperature in September: 62.4°F
The month with the highest average low temperature is August (68.5°F).
The coldest month (with the lowest average low temperature) is January (29.8°F).
Average pressure in September
Falmouth, 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
Falmouth, MA
- Average wind speed in September: 11.8mph
The windiest month (with the highest average wind speed) is January (15.3mph).
The calmest months (with the lowest average wind speed) are July and August (10.2mph).
Average humidity in September
Falmouth, MA
- Average humidity in September: 79%
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is November (74%).
Average rainfall in September
Falmouth, MA
- Average rainfall in September: 0.31"
The wettest month (with the highest rainfall) is October (0.71").
The driest months (with the least rainfall) are July, August and September (0.31").
Average rainfall days in September
Falmouth, MA
- Average rainfall days in September: 4.6 days
The month with the highest number of rainy days is July (7.7 days).
The month with the least rainy days is September (4.6 days).
Average snowfall in September
Falmouth, MA
- Average snowfall in September: 0"
The month with the highest snowfall is December (0.24").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Falmouth, MA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (4.4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in September
Falmouth, MA
- Average sea temperature in September: 65.8°F
The best month for swimming (with the highest average sea temperature) is August (68.4°F).
The coldest month (with the lowest average sea temperature) is February (38.2°F).
Average daylight in September /
Average sunshine in September
Falmouth, MA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The months with the least sunshine are February and December (Average sunshine: 4h and 42min).
Average sunshine days in September
Falmouth, MA
- Average sunshine days in September: 23.9 days
The month with the most sunshine days is September (23.9 days).
The month with the least sunshine days is February (20.8 days).
Average UV index in September
Falmouth, MA
- Average UV index in September: 5
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
Falmouth, MA
- Average cloud cover in September: 32
The months with the most cloud cover are February, March and December (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in September
Falmouth, 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).
Falmouth, Massachusetts, USA
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