September weather forecast
Yorktown, IA

Weather in September

September, the first month of the autumn in Yorktown, is also a moderately hot month, with an average temperature fluctuating between 76.6°F (24.8°C) and 57°F (13.9°C).

Temperature

In September, the average high-temperature slightly decreases from a warm 82.2°F (27.9°C) in August to a still moderately hot 76.6°F (24.8°C). In September, the average low-temperature is 57°F (13.9°C).

Humidity

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

Rainfall

In Yorktown, in September, during 10.1 rainfall days, 1.34" (34mm) of precipitation is typically accumulated. In Yorktown, during the entire year, the rain falls for 114.9 days and collects up to 18.39" (467mm) of precipitation.

Snowfall

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

Daylight

The average length of the day in September in Yorktown is 12h and 27min.
On the first day of September in Yorktown, sunrise is at 6:47 am and sunset at 7:53 pm. On the last day of the month, sunrise is at 7:16 am and sunset at 7:05 pm CDT.

Sunshine

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

UV index

The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against sunburn is recommended. 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 temperature in September in Yorktown?

In Yorktown, Iowa, in September, the average high-temperature is 76.6°F (24.8°C), and the average low-temperature is 57°F (13.9°C). The average heat index (a.k.a. 'apparent temperature', 'feels like'), which calculates the temperature value influenced by the moisture in the air, in August is evaluated at 89.6°F (32°C).

What is the average humidity in September in Yorktown?

In September, the average relative humidity is 75%.

How many days does it rain in September in Yorktown?

In Yorktown, Iowa, in September, it is raining for 10.1 days, with typically 1.34" (34mm) of accumulated precipitation.

When it does not snow in Yorktown?

May through September are months without snowfall in Yorktown.

Does it snow in Yorktown in September?

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

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

The average day length in September in Yorktown is 12h and 27min.

When are sunrise and sunset in September in Yorktown?

On the first day of September, sunrise is at 6:47 am and sunset at 7:53 pm. On the last day of the month, sunrise is at 7:16 am and sunset at 7:05 pm CDT.

How many hours of sunshine does Yorktown have in September?

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

How high is the UV index in September in Yorktown?

In Yorktown, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate health threat from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Yorktown, IA

Average temperature in September - Yorktown, IA
  • Average high temperature in September: 76.6°F

The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (31.1°F).

  • Average low temperature in September: 57°F

The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (17.2°F).

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Average pressure in September
Yorktown, IA

Average pressure in September - Yorktown, IA
  • Average pressure in September: 30"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).

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Average wind speed in September
Yorktown, IA

Average wind speed in September - Yorktown, IA
  • Average wind speed in September: 8mph

The windiest month (with the highest average wind speed) is March (10.3mph).
The calmest month (with the lowest average wind speed) is July (6.7mph).

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Average humidity in September
Yorktown, IA

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

The month with the highest relative humidity is January (80%).
The month with the lowest relative humidity is October (69%).

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Average rainfall in September
Yorktown, IA

Average rainfall in September - Yorktown, IA
  • Average rainfall in September: 1.34"

The wettest month (with the highest rainfall) is June (3.39").
The driest month (with the least rainfall) is February (0.43").

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Average rainfall days in September
Yorktown, IA

Average rainfall days in September - Yorktown, 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 February (3.4 days).

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Average snowfall in September
Yorktown, IA

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

The month with the highest snowfall is January (2.17").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in September
Yorktown, IA

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

The month with the highest number of snowfall days is January (7.8 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
Yorktown, IA

Average daylight in September / Average sunshine in September - Yorktown, IA
  • Average daylight in September: 12h and 27min

The month with the longest days is June (Average daylight: 15h and 3min).
The month with the shortest days is December (Average daylight: 9h and 19min).

  • Average sunshine in September: 9h and 18min

The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).

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Average sunshine days in September
Yorktown, IA

Average sunshine days in September - Yorktown, IA
  • Average sunshine days in September: 17.5 days

The month with the most sunshine days is November (22.5 days).
The month with the least sunshine days is June (12.3 days).

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Average UV index in September
Yorktown, IA

Average UV index in September - Yorktown, 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, November and December (UV index 2).

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Average cloud cover in September
Yorktown, IA

Average cloud cover in September - Yorktown, IA
  • Average cloud cover in September: 28

The month with the most cloud cover is January (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 27).

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Average visibility in September
Yorktown, IA

Average visibility in September - Yorktown, 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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