Winthrop
Massachusetts, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Winthrop, MA

September, the first month of the autumn, in Winthrop, is also an agreeable month, with average temperature varying between 57.4°F (14.1°C) and 72.7°F (22.6°C).

Temperature

In Winthrop, the average high-temperature marginally drops, from a warm 80.4°F (26.9°C) in August, to an agreeable 72.7°F (22.6°C). In Winthrop, in September, the average low-temperature is 57.4°F (14.1°C).

Humidity

In September, the average relative humidity is 75%.

Rainfall

September is the month with the least rainfall in Winthrop. Rain falls for 10 days and accumulates 1.26" (32mm) of precipitation.

Snowfall

June through September are months without snowfall.

Ocean temperature

In Winthrop, in September, the average water temperature is 64°F (17.8°C).
Note: Swimming in 64°F (17.8°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

Daylight

The average length of the day in September is 12.5h.

Sunshine

The average sunshine in September is 8.4h.

UV index

In September, the average daily maximum UV index in Winthrop is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 4 in September transform into the following instructions:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.

What is the temperature in September in Winthrop?

In Winthrop, in September, the average high-temperature is 72.7°F (22.6°C), and the average low-temperature is 57.4°F (14.1°C).

What is the average humidity in September in Winthrop?

In Winthrop, the average relative humidity in September is 75%.

How many days does it rain in September in Winthrop?

In September, in Winthrop, Massachusetts, the rain falls for 10 days. Throughout September, 1.26" (32mm) of precipitation is accumulated.

What is the driest month in Winthrop?

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

Does it snow in Winthrop in September?

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

When it does not snow in Winthrop?

June through September are months without snowfall in Winthrop.

How cold is the water in September in Winthrop?

In Winthrop, the average seawater temperature in September is 64°F (17.8°C). 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).

What is the average length of the day in September in Winthrop?

The average length of the day in September in Winthrop, Massachusetts, is 12.5h.

How many hours of sunshine does Winthrop have in September?

In Winthrop, Massachusetts, the average sunshine in September is 8.4h.

How high is the UV index in September in Winthrop?

The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium hazard to health from unsafe exposure to the Sun's UV rays.
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).

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%).

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").

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).

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

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

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

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

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).

Average daylight in September / Average sunshine in September - Winthrop, 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: 9.1h).

  • Average sunshine in September: 8.4h

The month with the most sunshine is August (Average sunshine: 10.5h).
The month with the least sunshine is February (Average sunshine: 4.6h).

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

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