September weather forecast
Yarmouth, IA

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Weather in September

The first month of the autumn, September, is also a moderately hot month in Yarmouth, Iowa, with an average temperature varying between 56.7°F (13.7°C) and 76.1°F (24.5°C).

Temperature

As September commences, the average high-temperature subtly reduces, transitioning from 81.7°F (27.6°C) in August to a still moderately hot 76.1°F (24.5°C). Yarmouth cools down to an average low-temperature of 56.7°F (13.7°C) throughout the month of September.

Humidity

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

Rainfall

In Yarmouth, during September, the rain falls for 10.1 days and regularly aggregates up to 2.01" (51mm) of precipitation. In Yarmouth, Iowa, during the entire year, the rain falls for 130.4 days and collects up to 21.81" (554mm) of precipitation.

Snowfall

In Yarmouth, snow does not fall in May through September.

Daylight

In Yarmouth, the average length of the day in September is 12h and 27min.
On the first day of the month, sunrise is at 6:32 am and sunset at 7:37 pm. On the last day of September, in Yarmouth, sunrise is at 7:01 am and sunset at 6:48 pm CDT.

Sunshine

In Yarmouth, the average sunshine in September is 9.4h.

UV index

In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for ordinary individuals.
Note: The maximum daily UV index, 4 in September, converts into the following recommendations:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. Opt for tightly woven and loose clothing to enhance protection from the Sun.
Updated: Aug 28, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are September temperatures?

During September, Yarmouth experiences an average high-temperature of 76.1°F (24.5°C) and a low-temperature of 56.7°F (13.7°C). In August, the average heat index (a.k.a. 'apparent temperature', 'feels like'), which calculates the temperature value influenced by the moisture in the air, is computed to be 87.8°F (31°C).

What is the average humidity in September?

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

How many days does it rain in September?

In Yarmouth, in September, during 10.1 rainfall days, 2.01" (51mm) of precipitation is typically accumulated.

When it does not snow?

In Yarmouth, snow does not fall in May through September.

Does it snow in September?

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

What is the average length of the day in September?

In Yarmouth, the average day length in September is 12h and 27min.

When is the sunrise / sunset in September?

In September, on the first day of the month, sunrise is at 6:32 am and sunset at 7:37 pm. On the last day of the month, sunrise is at 7:01 am and sunset at 6:48 pm CDT.

How many hours of sunshine does Yarmouth have in September?

In Yarmouth, the average sunshine duration in September is 9.4h.

What is the UV index reading in September?

The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate vulnerability from exposure to the Sun's UV radiation.
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
Yarmouth, IA

Average temperature in September - Yarmouth, IA
  • Average high temperature in September: 76.1°F

The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (29.7°F).

  • Average low temperature in September: 56.7°F

The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (17.4°F).

Average pressure in September
Yarmouth, IA

Average pressure in September - Yarmouth, 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 (29.9"Hg).

Average wind speed in September
Yarmouth, IA

Average wind speed in September - Yarmouth, IA
  • Average wind speed in September: 7.9mph

The windiest months (with the highest average wind speed) are January, February, March and April (10.6mph).
The calmest months (with the lowest average wind speed) are July and August (6.8mph).

Average humidity in September
Yarmouth, IA

Average humidity in September - Yarmouth, IA
  • Average humidity in September: 75%

The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (70%).

Average rainfall in September
Yarmouth, IA

Average rainfall in September - Yarmouth, IA
  • Average rainfall in September: 2.01"

The wettest month (with the highest rainfall) is May (3.23").
The driest month (with the least rainfall) is December (0.87").

Average rainfall days in September
Yarmouth, IA

Average rainfall days in September - Yarmouth, IA
  • Average rainfall days in September: 10.1 days

The month with the highest number of rainy days is May (16.7 days).
The month with the least rainy days is January (4.7 days).

Average snowfall in September
Yarmouth, IA

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

The month with the highest snowfall is January (3.03").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in September
Yarmouth, IA

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

The month with the highest number of snowfall days is January (10 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Yarmouth, IA
  • 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 18min).

  • Average sunshine in September: 9h and 2min

The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).

Average sunshine days in September
Yarmouth, IA

Average sunshine days in September - Yarmouth, IA
  • Average sunshine days in September: 17.9 days

The months with the most sunshine days are October and December (18.5 days).
The month with the least sunshine days is June (10.5 days).

Average UV index in September
Yarmouth, IA

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

The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is January (UV index 1).

Average cloud cover in September
Yarmouth, IA

Average cloud cover in September - Yarmouth, IA
  • Average cloud cover in September: 30

The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 29).

Average visibility in September
Yarmouth, IA

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

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

Yarmouth, Iowa, USA

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