September weather forecast and climate
Welton, IA

Weather in September

The first month of the autumn, September, is still a warm month in Welton, Iowa, with average temperature varying between 74.1°F (23.4°C) and 55°F (12.8°C).

Temperature

In Welton, the average high-temperature marginally drops, from 80.1°F (26.7°C) in August, to a still warm 74.1°F (23.4°C). In September, the average low-temperature is 55°F (12.8°C).

Humidity

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

Rainfall

In Welton, it is raining for 11.2 days, with typically 2.28" (58mm) of accumulated precipitation. In Welton, during the entire year, the rain falls for 142.1 days and collects up to 28.35" (720mm) of precipitation.

Snowfall

In Welton snow does not fall in May through September.

Daylight

In Welton, the average length of the day is 12.5h.

Sunshine

In September, the average sunshine is 9.2h.

UV index

In Welton, the average daily maximum UV index in September 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 ordinary individuals.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions - Protection against the skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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 Welton?

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

How much does it rain in Welton in September?

In Welton, Iowa, in September, during 11.2 rainfall days, 2.28" (58mm) of precipitation is typically accumulated.

When it does not snow in Welton?

In Welton, Iowa, snow does not fall in May through September.

Does it snow in Welton in September?

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

How many hours of daylight does Welton have in September?

In September, the average length of the day in Welton is 12.5h.

How many hours of sunshine does Welton have in September?

The average sunshine in September in Welton is 9.2h.

What is the UV index reading in September in Welton?

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

Average temperature in September
Welton, IA

Average temperature in September - Welton, IA
  • Average high temperature in September: 74.1°F

The warmest month (with the highest average high temperature) is July (80.4°F).
The month with the lowest average high temperature is January (26.6°F).

  • Average low temperature in September: 55°F

The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (14.4°F).

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Average pressure in September
Welton, IA

Average pressure in September - Welton, IA
  • Average pressure in September: 30.02"

The month with the highest atmospheric pressure is January (30.13").
The month with the lowest atmospheric pressure is June (29.9").

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Average wind speed in September
Welton, IA

Average wind speed in September - Welton, IA
  • Average wind speed in September: 7.7mph

The windiest month (with the highest average wind speed) is April (10.5mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).

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Average humidity in September
Welton, IA

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

The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is October (73%).

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Average rainfall in September
Welton, IA

Average rainfall in September - Welton, IA
  • Average rainfall in September: 2.28"

The wettest month (with the highest rainfall) is May (4.61").
The driest month (with the least rainfall) is February (1.26").

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Average rainfall days in September
Welton, IA

Average rainfall days in September - Welton, IA
  • Average rainfall days in September: 11.2 days

The month with the highest number of rainy days is May (18.2 days).
The month with the least rainy days is February (5.3 days).

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Average snowfall in September
Welton, IA

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

The month with the highest snowfall is January (5.2").
Months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in September
Welton, IA

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

The month with the highest number of snowfall days is January (11.5 days).
Months with the least snowfall days are May, June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Welton, 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: 9.2h

The month with the most sunshine is July (Average sunshine: 10h).
The month with the least sunshine is January (Average sunshine: 3.9h).

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Average sunshine days in September
Welton, IA

Average sunshine days in September - Welton, IA
  • Average sunshine days in September: 17.1 days

The month with the most sunshine days is November (17.5 days).
The month with the least sunshine days is May (10.7 days).

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Average UV index in September
Welton, IA

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

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

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Average cloud cover in September
Welton, IA

Average cloud cover in September - Welton, IA
  • Average cloud cover in September: 31

The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 30).

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Average visibility in September
Welton, IA

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

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

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