September weather forecast
Lamoni, IA

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Weather in September

There is a noticeable change in the weather from August to September in Lamoni, Iowa. September's weather records an average high temperature of 76.1°F (24.5°C), marking the onset of the fall season. The hint of a season change is reflected in shorter daylight hours and a slight chill in the night air. Despite the decrease in average high temperatures, September often remains sunny and clear. The transition from September to October leads to a considerable contraction in the temperature range and a visible shift in climatic patterns.

Temperature

The arrival of September in Lamoni corresponds with a light shift in temperature, down from a moderately hot 82°F (27.8°C) in August to a still warm 76.1°F (24.5°C). September brings an average low-temperature of 56.3°F (13.5°C) to Lamoni.

Humidity

In Lamoni, the average relative humidity in September is 76%.

Rainfall

In September, the rain falls for 10.5 days. Throughout September, 2.2" (56mm) of precipitation is accumulated. Throughout the year, in Lamoni, there are 124.4 rainfall days, and 21.42" (544mm) of precipitation is accumulated.

Snowfall

June through September are months without snowfall in Lamoni.

Daylight

In September, the average length of the day in Lamoni, Iowa, is 12h and 27min.
On the first day of the month, sunrise is at 6:43 am and sunset at 7:47 pm. On the last day of September, in Lamoni, sunrise is at 7:11 am and sunset at 6:58 pm CDT.

Sunshine

The average sunshine in September in Lamoni is 9.3h.

UV index

In September, the average daily maximum UV index in Lamoni is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the average person.
Note: In September, the maximum UV index of 5 translates into these guidelines:
Heed the precautions - Suggestions to avoid sunburn are made. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.
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Frequently asked questions

What are the temperatures in Lamoni in September?

The average high-temperature and low-temperature during September are 76.1°F (24.5°C) and 56.3°F (13.5°C) respectively. The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which represents the influence of relative humidity on air temperature, in August is appraised at 87.8°F (31°C).

What is the average humidity in September in Lamoni?

In Lamoni, Iowa, the average relative humidity in September is 76%.

How much does it rain in Lamoni in September?

In September, the rain falls for 10.5 days. Throughout September, 2.2" (56mm) of precipitation is accumulated.

When it does not snow in Lamoni?

In Lamoni, Iowa, snow does not fall in June through September.

Does it snow in Lamoni in September?

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

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

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

When is the sunrise / sunset in September in Lamoni?

In September, on the first day of the month, sunrise is at 6:43 am and sunset at 7:47 pm. On the last day of the month, in Lamoni, sunrise is at 7:11 am and sunset at 6:58 pm CDT.

How many hours of sunshine does Lamoni have in September?

In September, the average sunshine duration in Lamoni, Iowa, is 9.3h.

How high is the UV index in September in Lamoni?

In September, the average daily maximum UV index in Lamoni, Iowa, is 5. A UV Index of 3 to 5 symbolizes a moderate vulnerability from unprotected exposure to 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
Lamoni, IA

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

The warmest month (with the highest average high temperature) is July (83.5°F).
The month with the lowest average high temperature is January (30.7°F).

  • Average low temperature in September: 56.3°F

The month with the highest average low temperature is July (66.2°F).
The coldest month (with the lowest average low temperature) is January (16.9°F).

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Average pressure in September
Lamoni, IA

Average pressure in September - Lamoni, IA
  • Average pressure in September: 30.01"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).

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Average wind speed in September
Lamoni, IA

Average wind speed in September - Lamoni, IA
  • Average wind speed in September: 7.8mph

The windiest months (with the highest average wind speed) are January, February and March (10.3mph).
The calmest months (with the lowest average wind speed) are July and August (6.8mph).

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Average humidity in September
Lamoni, IA

Average humidity in September - Lamoni, IA
  • Average humidity in September: 76%

The month with the highest relative humidity is June (83%).
The month with the lowest relative humidity is October (71%).

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Average rainfall in September
Lamoni, IA

Average rainfall in September - Lamoni, IA
  • Average rainfall in September: 2.2"

The wettest month (with the highest rainfall) is June (3.43").
The driest months (with the least rainfall) are January, February and December (0.71").

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Average rainfall days in September
Lamoni, IA

Average rainfall days in September - Lamoni, IA
  • Average rainfall days in September: 10.5 days

The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is January (3.8 days).

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Average snowfall in September
Lamoni, IA

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

The month with the highest snowfall is January (2.95").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Lamoni, IA

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

The month with the highest number of snowfall days is January (8.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Lamoni, IA
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 15h and 0min).
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 18min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).

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Average sunshine days in September
Lamoni, IA

Average sunshine days in September - Lamoni, IA
  • Average sunshine days in September: 17.4 days

The month with the most sunshine days is December (21.5 days).
The month with the least sunshine days is May (11.4 days).

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Average UV index in September
Lamoni, IA

Average UV index in September - Lamoni, IA
  • Average UV index in September: 5

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, October, November and December (UV index 2).

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Average cloud cover in September
Lamoni, IA

Average cloud cover in September - Lamoni, IA
  • Average cloud cover in September: 29

The month with the most cloud cover is January (Cloud cover 50).
The months with the least cloud cover are July, August and September (Cloud cover 29).

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Average visibility in September
Lamoni, IA

Average visibility in September - Lamoni, IA
  • 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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Lamoni, Iowa, USA

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