September weather forecast
Winthrop, MA

Weather in September

The first month of the autumn, September, is still a pleasant month in Winthrop, Massachusetts, with temperature in the range of an average high of 72.7°F (22.6°C) and an average low of 57.4°F (14.1°C).

Temperature

In September, the average high-temperature marginally drops from a moderately hot 80.4°F (26.9°C) in August to a pleasant 72.7°F (22.6°C). The average low-temperature, in September, is 57.4°F (14.1°C).

Humidity

The average relative humidity in September is 75%.

Rainfall

The month with the least rainfall is September, when the rain falls for 10 days and typically collects 1.26" (32mm) of precipitation.

Snowfall

In Winthrop, snow does not fall in June through September.

Ocean temperature

In Winthrop, the average seawater temperature in September is 64°F (17.8°C).
Note: For most, swimming in 64°F (17.8°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).

Daylight

The average length of the day in September in Winthrop is 12h and 28min.
On the first day of September in Winthrop, sunrise is at 6:09 am and sunset at 7:18 pm. On the last day of the month, sunrise is at 6:40 am and sunset at 6:27 pm EDT.

Sunshine

The average sunshine in September is 8.4h.

UV index

In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. 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 Winthrop?

The average relative humidity in September is 75%.

What is the driest month in Winthrop?

The month with the least rainfall in Winthrop, Massachusetts, is September, when the rain falls for 10 days and typically collects 1.26" (32mm) of precipitation.

How many days does it rain in September in Winthrop?

In Winthrop, in September, during 10 rainfall days, 1.26" (32mm) of precipitation is typically accumulated.

When it does not snow in Winthrop?

In Winthrop, Massachusetts, snow does not fall in June through September.

Does it snow in Winthrop in September?

In Winthrop, Massachusetts, in September, it doesn't snow. In October, it regularly snows.

What is the ocean temperature in September in Winthrop?

In Winthrop, Massachusetts, the average seawater temperature in September is 64°F (17.8°C). For swimming, a surface water temperature of 64°F (17.8°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).

How many hours of daylight does Winthrop have in September?

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

When is the sunrise / sunset in September in Winthrop?

On the first day of September in Winthrop, sunrise is at 6:09 am and sunset at 7:18 pm. On the last day of the month, sunrise is at 6:40 am and sunset at 6:27 pm EDT.

How long on average sun shines in September in Winthrop?

The average sunshine duration in September in Winthrop is 8.4h.

What is the UV index reading in September in Winthrop?

In Winthrop, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Winthrop, MA

Average temperature in September - Winthrop, MA
  • Average high temperature in September: 72.7°F

The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (34.2°F).

  • Average low temperature in September: 57.4°F

The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (22.6°F).

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Average pressure in September
Winthrop, MA

Average pressure in September - Winthrop, 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).

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Average wind speed in September
Winthrop, MA

Average wind speed in September - Winthrop, MA
  • Average wind speed in September: 6.8mph

The windiest month (with the highest average wind speed) is January (9.9mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).

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Average humidity in September
Winthrop, MA

Average humidity in September - Winthrop, MA
  • Average humidity in September: 75%

The month with the highest relative humidity is February (77%).
The month with the lowest relative humidity is April (69%).

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Average rainfall in September
Winthrop, MA

Average rainfall in September - Winthrop, MA
  • Average rainfall in September: 1.26"

The wettest months (with the highest rainfall) are March, April and December (2.91").
The driest month (with the least rainfall) is September (1.26").

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Average rainfall days in September
Winthrop, MA

Average rainfall days in September - Winthrop, MA
  • Average rainfall days in September: 10 days

The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is January (7.9 days).

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Average snowfall in September
Winthrop, MA

Average snowfall in September - Winthrop, MA
  • Average snowfall in September: 0"

The month with the highest snowfall is February (4.72").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Winthrop, MA

Average snowfall days in September - Winthrop, MA
  • Average snowfall days in September: 0 days

The months with the highest number of snowfall days are January and February (7.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average sea temperature in September
Winthrop, MA

Average sea temperature in September - Winthrop, MA
  • Average sea temperature in September: 64°F

The best month for swimming (with the highest average sea temperature) is August (67.6°F).
The coldest month (with the lowest average sea temperature) is March (38.8°F).

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Average daylight in September /
Average sunshine in September
Winthrop, MA

Average daylight in September / Average sunshine in September - Winthrop, MA
  • Average daylight in September: 12h and 28min

The month with the longest days is June (Average daylight: 15h and 14min).
The month with the shortest days is December (Average daylight: 9h and 8min).

  • Average sunshine in September: 8h and 24min

The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).

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Average sunshine days in September
Winthrop, MA

Average sunshine days in September - Winthrop, MA
  • Average sunshine days in September: 17.7 days

The month with the most sunshine days is September (17.7 days).
The month with the least sunshine days is April (13 days).

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Average UV index in September
Winthrop, MA

Average UV index in September - Winthrop, MA
  • Average UV index in September: 4

The months with the highest UV index are June, July and August (UV index 6).
The 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
Winthrop, MA

Average cloud cover in September - Winthrop, MA
  • Average cloud cover in September: 37

The month with the most cloud cover is March (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 32).

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Average visibility in September
Winthrop, MA

Average visibility in September - Winthrop, 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).

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