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
With the onset of September, Knowlton experiences a modest temperature adjustment, with the average high-temperature gently receding from a moderately hot 81.7°F (27.6°C) in August to a still warm 75.9°F (24.4°C). September nights observe an average temperature dip to a mild 56.3°F (13.5°C).Humidity
The average relative humidity in September is 76%.Rainfall
In Knowlton, in September, it is raining for 11 days, with typically 2.24" (57mm) of accumulated precipitation. Throughout the year, in Knowlton, there are 126.9 rainfall days, and 22.6" (574mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall in Knowlton.Daylight
In September, the average length of the day is 12h and 27min.On the first day of September, sunrise is at 6:45 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:13 am and sunset at 7:00 pm CDT.
Sunshine
In Knowlton, the average sunshine in September is 9.3h.UV index
The average daily maximum UV index in September in Knowlton is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the ordinary person.Note: The UV index of 5 during September translates into the following guidance:
Exercise prevention - Precautions against solar damage are endorsed. UV radiation from the Sun is most dangerous during midday; take precautions and seek 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.
Frequently asked questions
What is the average September temperature in Knowlton?
What is the average humidity in September in Knowlton?
How many days does it rain in September in Knowlton?
When it does not snow in Knowlton?
Does it snow in Knowlton in September?
How many hours of daylight does Knowlton have in September?
When are sunrise and sunset in September in Knowlton?
How long on average sun shines in September in Knowlton?
What is the UV index reading in September in Knowlton?
Average temperature in September
Knowlton, IA
- Average high temperature in September: 75.9°F
The warmest month (with the highest average high temperature) is July (83.5°F).
The month with the lowest average high temperature is January (30.6°F).
- Average low temperature in September: 56.3°F
The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (16.9°F).
Average pressure in September
Knowlton, IA
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in September
Knowlton, IA
- Average wind speed in September: 7.8mph
The windiest months (with the highest average wind speed) are January, February and March (10.3mph).
The calmest months (with the lowest average wind speed) are July and August (6.8mph).
Average humidity in September
Knowlton, IA
- Average humidity in September: 76%
The month with the highest relative humidity is June (82%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Knowlton, IA
- Average rainfall in September: 2.24"
The wettest month (with the highest rainfall) is June (3.86").
The driest months (with the least rainfall) are February and December (0.71").
Average rainfall days in September
Knowlton, IA
- Average rainfall days in September: 11 days
The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is January (4.1 days).
Average snowfall in September
Knowlton, IA
- Average snowfall in September: 0"
The month with the highest snowfall is January (3.54").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Knowlton, 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).
Average daylight in September /
Average sunshine in September
Knowlton, IA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 6min).
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 18min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).
Average sunshine days in September
Knowlton, IA
- Average sunshine days in September: 16.9 days
The month with the most sunshine days is November (21.2 days).
The month with the least sunshine days is May (10.6 days).
Average UV index in September
Knowlton, IA
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in September
Knowlton, IA
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 28).
Average visibility in September
Knowlton, 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).
Knowlton, Iowa, USA
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