September weather forecast
Winthrop, IA

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Weather in September

September, the first month of the autumn in Winthrop, is also an agreeable month, with an average temperature ranging between max 72.5°F (22.5°C) and min 54°F (12.2°C).

Temperature

Winthrop's transition into September involves a gentle shift in temperature, receding from a warm 78.3°F (25.7°C) in August to a pleasant 72.5°F (22.5°C). September brings an average low-temperature of 54°F (12.2°C) to Winthrop.

Humidity

In Winthrop, the average relative humidity in September is 79%.

Rainfall

In Winthrop, during September, the rain falls for 11.8 days and regularly aggregates up to 2.72" (69mm) of precipitation. In Winthrop, during the entire year, the rain falls for 140.6 days and collects up to 30" (762mm) of precipitation.

Snowfall

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

Daylight

In Winthrop, the average length of the day in September is 12h and 28min.
On the first day of the month, sunrise is at 6:32 am and sunset at 7:40 pm. On the last day of September, sunrise is at 7:03 am and sunset at 6:49 pm CDT.

Sunshine

In September, the average sunshine is 9h.

UV index

In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: A maximum daily UV index of 4 during September morphs into the following directions:
Take precautions - Protection against sun damage is advised. Minimize direct exposure to the Sun during midday when its radiation is at its peak. During bright days, sunglasses that offer UVA and UVB defense are recommended.
Updated: Jun 20, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are September temperatures?

During September, Winthrop experiences an average high-temperature of 72.5°F (22.5°C) and a low-temperature of 54°F (12.2°C).

What is the average humidity in September?

In Winthrop, the average relative humidity in September is 79%.

How much does it rain in September?

In September, the rain falls for 11.8 days. Throughout September, 2.72" (69mm) of precipitation is accumulated.

When it does not snow?

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

Does it snow in Winthrop in September?

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

What is the average length of the day in September?

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

When are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:32 am and sunset at 7:40 pm. On the last day of the month, sunrise is at 7:03 am and sunset at 6:49 pm CDT.

How many hours of sunshine does Winthrop have in September?

In September, the average sunshine duration is 9h.

What is the UV index reading in September?

The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium health risk from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Winthrop, IA

Average temperature in September - Winthrop, IA
  • Average high temperature in September: 72.5°F

The warmest month (with the highest average high temperature) is July (79.5°F).
The month with the lowest average high temperature is January (24.3°F).

  • Average low temperature in September: 54°F

The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (12.2°F).

Average pressure in September
Winthrop, IA

Average pressure in September - Winthrop, IA
  • Average pressure in September: 30.02"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).

Average wind speed in September
Winthrop, IA

Average wind speed in September - Winthrop, IA
  • Average wind speed in September: 8.2mph

The windiest month (with the highest average wind speed) is April (10.9mph).
The calmest month (with the lowest average wind speed) is August (7mph).

Average humidity in September
Winthrop, IA

Average humidity in September - Winthrop, IA
  • Average humidity in September: 79%

The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is October (73%).

Average rainfall in September
Winthrop, IA

Average rainfall in September - Winthrop, IA
  • Average rainfall in September: 2.72"

The wettest months (with the highest rainfall) are May and June (4.37").
The driest month (with the least rainfall) is January (1.14").

Average rainfall days in September
Winthrop, IA

Average rainfall days in September - Winthrop, IA
  • Average rainfall days in September: 11.8 days

The month with the highest number of rainy days is June (18.8 days).
The month with the least rainy days is January (3.6 days).

Average snowfall in September
Winthrop, IA

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

The month with the highest snowfall is January (5.12").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
Winthrop, IA

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

The month with the highest number of snowfall days is January (11.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Winthrop, IA
  • 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 6min).

  • Average sunshine in September: 9h and 0min

The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).

Average sunshine days in September
Winthrop, IA

Average sunshine days in September - Winthrop, IA
  • Average sunshine days in September: 15.4 days

The months with the most sunshine days are January, October and November (17.5 days).
The month with the least sunshine days is June (8.2 days).

Average UV index in September
Winthrop, IA

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

The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January and December (UV index 1).

Average cloud cover in September
Winthrop, IA

Average cloud cover in September - Winthrop, IA
  • Average cloud cover in September: 32

The month with the most cloud cover is January (Cloud cover 61).
The months with the least cloud cover are August and September (Cloud cover 32).

Average visibility in September
Winthrop, IA

Average visibility in September - Winthrop, IA
  • Average visibility in September: 6mi

The months with the highest visibility are February, March, April, May, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January and July (5mi).

Winthrop, Iowa, USA

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