September weather forecast
Newton, IA

Weather in September

The first month of the autumn, September, is still a warm month in Newton, Iowa, with average temperature varying between 55.8°F (13.2°C) and 74.7°F (23.7°C).

Temperature

In September, the average high-temperature marginally drops, from 80.6°F (27°C) in August, to a still warm 74.7°F (23.7°C). In September, in Newton, Iowa, the average low-temperature is 55.8°F (13.2°C).

Humidity

In September, the average relative humidity is 77%.

Rainfall

In Newton, in September, during 9.6 rainfall days, 1.3" (33mm) of precipitation is typically accumulated. In Newton, during the entire year, the rain falls for 106.7 days and collects up to 11.77" (299mm) of precipitation.

Snowfall

June through September are months without snowfall.

Daylight

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

Sunshine

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

UV index

The average daily maximum UV index in Newton is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 4 interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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 Newton?

In Newton, Iowa, the average relative humidity in September is 77%.

How much does it rain in Newton in September?

In Newton, Iowa, in September, it is raining for 9.6 days, with typically 1.3" (33mm) of accumulated precipitation.

When it does not snow in Newton?

In Newton snow does not fall in June through September.

Does it snow in Newton in September?

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

How many hours of daylight does Newton have in September?

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

How many hours of sunshine does Newton have in September?

The average sunshine in September is 9.4h.

What is the UV index intensity in September in Newton?

The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium hazard to health from the exposure to the Sun's UV radiation.

Average temperature in September
Newton, IA

Average temperature in September - Newton, IA
  • Average high temperature in September: 23.7°C

The warmest month (with the highest average high temperature) is July (27.5°C).
The month with the lowest average high temperature is January (-2.7°C).

  • Average low temperature in September: 13.2°C

The month with the highest average low temperature is July (18.2°C).
The coldest month (with the lowest average low temperature) is January (-9.8°C).

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Average pressure in September
Newton, IA

Average pressure in September - Newton, IA
  • Average pressure in September: 1016.5mbar

The month with the highest atmospheric pressure is January (1021.1mbar).
The month with the lowest atmospheric pressure is June (1012.2mbar).

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Average wind speed in September
Newton, IA

Average wind speed in September - Newton, IA
  • Average wind speed in September: 12.9km/h

The windiest month (with the highest average wind speed) is April (17km/h).
The calmest month (with the lowest average wind speed) is August (11.2km/h).

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Average humidity in September
Newton, IA

Average humidity in September - Newton, IA
  • Average humidity in September: 77%

The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is October (71%).

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Average rainfall in September
Newton, IA

Average rainfall in September - Newton, IA
  • Average rainfall in September: 33mm

The wettest month (with the highest rainfall) is May (54mm).
The driest months (with the least rainfall) are January, February and December (10mm).

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Average rainfall days in September
Newton, IA

Average rainfall days in September - Newton, IA
  • Average rainfall days in September: 9.6 days

The month with the highest number of rainy days is May (14.7 days).
The month with the least rainy days is February (3.4 days).

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Average snowfall in September
Newton, IA

Average snowfall in September - Newton, IA
  • Average snowfall in September: 0mm

The month with the highest snowfall is January (44mm).
The months with the least snowfall are June, July, August and September (0mm).

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Average snowfall days in September
Newton, IA

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

The month with the highest number of snowfall days is January (8.4 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
Newton, IA

Average daylight in September / Average sunshine in September - Newton, IA
  • 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: 9.2h).

  • Average sunshine in September: 9.4h

The month with the most sunshine is July (Average sunshine: 10.3h).
The month with the least sunshine is January (Average sunshine: 4.2h).

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Average sunshine days in September
Newton, IA

Average sunshine days in September - Newton, IA
  • Average sunshine days in September: 18.1 days

The month with the most sunshine days is December (22.9 days).
The month with the least sunshine days is June (12.2 days).

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Average UV index in September
Newton, IA

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

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

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Average cloud cover in September
Newton, IA

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

The month with the most cloud cover is January (Cloud cover 55).
The months with the least cloud cover are July and September (Cloud cover 30).

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Average visibility in September
Newton, IA

Average visibility in September - Newton, IA
  • Average visibility in September: 9km

The month with the highest visibility is November (10km).
The months with the lowest visibility are July and August (8km).

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