Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
In September, the average high-temperature marginally decreases from a warm 82.9°F (28.3°C) in August to a still moderately hot 77.5°F (25.3°C). An average low-temperature of 57.7°F (14.3°C) is observed during September nights.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. In Keokuk, during the entire year, the rain falls for 140.6 days and collects up to 27.72" (704mm) of precipitation.Snowfall
May through September are months without snowfall in Keokuk.Daylight
The average length of the day in September in Keokuk is 12h and 27min.On the first day of the month, sunrise is at 6:33 am and sunset at 7:37 pm. On the last day of September, sunrise is at 7:01 am and sunset at 6:48 pm CDT.
Sunshine
In Keokuk, the average sunshine in September is 9.4h.UV index
In Keokuk, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for the average person.Note: In September, the maximum UV index of 5 translates into these guidelines:
Put precautions into practice - Ensuring skin and eye safety is a necessity. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
Does it snow in Keokuk in September?
How many hours of daylight does Keokuk have in September?
When are sunrise and sunset in September?
How many hours of sunshine does Keokuk have in September?
How high is the UV index in September?
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).
Average pressure in September
Keokuk, IA
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
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).
Average humidity in September
Keokuk, IA
- Average humidity in September: 74%
The months with the highest relative humidity are June and July (81%).
The month with the lowest relative humidity is October (70%).
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").
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).
Average snowfall in September
Keokuk, IA
- Average snowfall in September: 0"
The month with the highest snowfall is January (3.94").
The months with the least snowfall are May, June, July, August and September (0").
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).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Keokuk, 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 24min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).
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).
Average UV index in September
Keokuk, 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).
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).
The months with the least cloud cover are July and August (Cloud cover 28).
Average visibility in September
Keokuk, 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).
Keokuk, Iowa, USA
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