September weather forecast and climate
Keokuk, IA

Weather in September

September, the first month of the autumn, in Keokuk, is still a warm month, with average temperature fluctuating between 57.7°F (14.3°C) and 77.5°F (25.3°C).

Temperature

In September, the average high-temperature marginally drops, from a moderately hot 82.9°F (28.3°C) in August, to a still warm 77.5°F (25.3°C). In Keokuk, Iowa, in September, the average low-temperature is 57.7°F (14.3°C).

Humidity

In Keokuk, the average relative humidity in September is 74%.

Rainfall

In Keokuk, during September, the rain falls for 11.7 days and regularly aggregates up to 2.28" (58mm) of precipitation. Throughout the year, in Keokuk, there are 140.6 rainfall days, and 27.72" (704mm) of precipitation is accumulated.

Snowfall

In Keokuk snow does not fall in May through September.

Daylight

In September, the average length of the day in Keokuk is 12.4h.

Sunshine

In September, the average sunshine is 9.4h.

UV index

In September, the average daily maximum UV index in Keokuk is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 5 in September transform into the following instructions:
Take precautions - Protection against sun damage is advised. 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 Keokuk?

In Keokuk, Iowa, the average relative humidity in September is 74%.

How much does it rain in Keokuk in September?

In September, in Keokuk, the rain falls for 11.7 days. Throughout September, 2.28" (58mm) of precipitation is accumulated.

When it does not snow in Keokuk?

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

Does it snow in Keokuk in September?

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

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

In September, the average length of the day in Keokuk is 12.4h.

How long on average sun shines in September in Keokuk?

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

What is the UV index reading in September in Keokuk?

The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium health risk from unsafe exposure to the Sun's UV rays.

Average temperature in September
Keokuk, IA

Average temperature in September - Keokuk, IA
  • Average high temperature in September: 77.5°F

The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is January (31.6°F).

  • Average low temperature in September: 57.7°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 (19.2°F).

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Average pressure in September
Keokuk, IA

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

The month with the highest atmospheric pressure is January (30.15").
The month with the lowest atmospheric pressure is June (29.9").

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Average wind speed in September
Keokuk, IA

Average wind speed in September - Keokuk, IA
  • Average wind speed in September: 7.5mph

The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).

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Average humidity in September
Keokuk, IA

Average humidity in September - Keokuk, IA
  • Average humidity in September: 74%

Months with the highest relative humidity are June and July (81%).
The month with the lowest relative humidity is October (70%).

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Average rainfall in September
Keokuk, IA

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

The wettest month (with the highest rainfall) is May (3.9").
The driest month (with the least rainfall) is January (1.34").

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Average rainfall days in September
Keokuk, IA

Average rainfall days in September - Keokuk, IA
  • Average rainfall days in September: 11.7 days

The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is February (5.7 days).

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Average snowfall in September
Keokuk, IA

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

The month with the highest snowfall is January (3.94").
Months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in September
Keokuk, IA

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

The month with the highest number of snowfall days is January (9.8 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
Keokuk, IA

Average daylight in September / Average sunshine in September - Keokuk, IA
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.3h).

  • Average sunshine in September: 9.4h

The month with the most sunshine is July (Average sunshine: 10.4h).
The month with the least sunshine is January (Average sunshine: 4.3h).

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Average sunshine days in September
Keokuk, IA

Average sunshine days in September - Keokuk, IA
  • Average sunshine days in September: 16.5 days

The month with the most sunshine days is December (18.6 days).
The month with the least sunshine days is June (10.9 days).

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Average UV index in September
Keokuk, IA

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

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in September
Keokuk, IA

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

The month with the most cloud cover is January (Cloud cover 53).
Months with the least cloud cover are July and August (Cloud cover 28).

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Average visibility in September
Keokuk, IA

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

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

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