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
The start of September involves a subtle temperature drop, shifting from a warm 80.4°F (26.9°C) in August to a still moderately hot 74.7°F (23.7°C). Guernsey experiences a consistent average temperature of 55.6°F (13.1°C) throughout the nights in September.Humidity
In Guernsey, the average relative humidity in September is 77%.Rainfall
In September, in Guernsey, the rain falls for 12.8 days. Throughout September, 2.8" (71mm) of precipitation is accumulated. Throughout the year, there are 145.5 rainfall days, and 30.39" (772mm) of precipitation is accumulated.Snowfall
In Guernsey, snow does not fall in June through September.Daylight
In September, the average length of the day in Guernsey, Iowa, is 12h and 28min.On the first day of the month, sunrise is at 6:36 am and sunset at 7:42 pm. On the last day of September, sunrise is at 7:05 am and sunset at 6:52 pm CDT.
Sunshine
In Guernsey, the average sunshine in September is 9.4h.UV index
In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the ordinary person.Note: The maximum daily UV index of 4 in September interprets into the following recommendations:
Undertake precautions - Obligation exists to protect against skin and eye damage. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Opt for tightly woven and loose clothing to enhance protection from the Sun.
Frequently asked questions
What are September temperatures in Guernsey?
What is the average humidity in September in Guernsey?
How much does it rain in Guernsey in September?
When it does not snow in Guernsey?
Does it snow in Guernsey in September?
What is the average length of the day in September in Guernsey?
When is the sunrise / sunset in September in Guernsey?
How many hours of sunshine does Guernsey have in September?
How high is the UV index in September in Guernsey?
Average temperature in September
Guernsey, IA
- Average high temperature in September: 74.7°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (27.1°F).
- Average low temperature in September: 55.6°F
The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (14.7°F).
Average pressure in September
Guernsey, 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 (29.89"Hg).
Average wind speed in September
Guernsey, IA
- Average wind speed in September: 8mph
The windiest months (with the highest average wind speed) are January and April (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).
Average humidity in September
Guernsey, IA
- Average humidity in September: 77%
The months with the highest relative humidity are January and July (84%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
Guernsey, IA
- Average rainfall in September: 2.8"
The wettest month (with the highest rainfall) is May (4.57").
The driest month (with the least rainfall) is January (1.18").
Average rainfall days in September
Guernsey, IA
- Average rainfall days in September: 12.8 days
The month with the highest number of rainy days is June (18.9 days).
The month with the least rainy days is February (5 days).
Average snowfall in September
Guernsey, IA
- Average snowfall in September: 0"
The month with the highest snowfall is February (5.24").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Guernsey, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (10.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Guernsey, 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 12min).
- Average sunshine in September: 9h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in September
Guernsey, IA
- Average sunshine days in September: 15.7 days
The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is June (8.3 days).
Average UV index in September
Guernsey, IA
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in September
Guernsey, IA
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in September
Guernsey, IA
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January and July (5mi).
Guernsey, Iowa, USA
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