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
September's onset corresponds with a subtle shift in the average high-temperature, slightly moving from a warm 85.6°F (29.8°C) in August to a still moderately hot 77.2°F (25.1°C). Guernsey records a consistent low-temperature average of 54.3°F (12.4°C) during September, indicating a significant difference from the daytime heat.Humidity
In September, the average relative humidity in Guernsey is 40%.Rainfall
In Guernsey, in September, during 7.4 rainfall days, 0.75" (19mm) of precipitation is typically accumulated. Throughout the year, in Guernsey, there are 90.8 rainfall days, and 11.57" (294mm) of precipitation is accumulated.Snowfall
Months with snowfall in Guernsey are January through May, September through December. September is the first month it typically snows in Guernsey. Throughout September, in the average 0.3 snowfall days, it receives 0.94" (24mm) of snow. In Guernsey, during the entire year, snow falls for 46.4 days and aggregates up to 27.13" (689mm) of snow.Daylight
In September, the average length of the day is 12h and 28min.On the first day of the month, sunrise is at 6:25 am and sunset at 7:32 pm. On the last day of September, in Guernsey, sunrise is at 6:55 am and sunset at 6:41 pm MDT.
Sunshine
In Guernsey, the average sunshine in September is 10.6h.UV index
The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the ordinary person.Note: An average UV index of 5 in September transforms into this advice:
Undertake precautions - Guarding against sun damage is counselled. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. During bright days, sunglasses that offer UVA and UVB defense are recommended. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.
Frequently asked questions
What is the temperature in September in Guernsey?
What is the average humidity in September in Guernsey?
How much does it rain in Guernsey in September?
When does it start to snow in Guernsey?
What is the average length of the day in September in Guernsey?
What time are sunrise and sunset in September in Guernsey?
How many hours of sunshine does Guernsey have in September?
What is the UV index intensity in September in Guernsey?
Average temperature in September
Guernsey, WY
- Average high temperature in September: 77.2°F
The warmest month (with the highest average high temperature) is July (86.9°F).
The month with the lowest average high temperature is December (35.1°F).
- Average low temperature in September: 54.3°F
The month with the highest average low temperature is July (62.8°F).
The coldest months (with the lowest average low temperature) are February and December (21.6°F).
Average pressure in September
Guernsey, WY
- Average pressure in September: 29.95"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in September
Guernsey, WY
- Average wind speed in September: 9.6mph
The windiest month (with the highest average wind speed) is January (15mph).
The calmest month (with the lowest average wind speed) is August (8.6mph).
Average humidity in September
Guernsey, WY
- Average humidity in September: 40%
The month with the highest relative humidity is February (66%).
The month with the lowest relative humidity is August (39%).
Average rainfall in September
Guernsey, WY
- Average rainfall in September: 0.75"
The wettest month (with the highest rainfall) is May (1.97").
The driest month (with the least rainfall) is January (0.35").
Average rainfall days in September
Guernsey, WY
- Average rainfall days in September: 7.4 days
The month with the highest number of rainy days is May (12.7 days).
The month with the least rainy days is January (3.6 days).
Average snowfall in September
Guernsey, WY
- Average snowfall in September: 0.94"
The month with the highest snowfall is April (4.45").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Guernsey, WY
- Average snowfall days in September: 0.3 days
The month with the highest number of snowfall days is February (8.3 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Guernsey, WY
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 10h and 4min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The months with the least sunshine are February and December (Average sunshine: 6h and 36min).
Average sunshine days in September
Guernsey, WY
- Average sunshine days in September: 20.1 days
The month with the most sunshine days is January (21.9 days).
The month with the least sunshine days is April (14.5 days).
Average UV index in September
Guernsey, WY
- 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
Guernsey, WY
- Average cloud cover in September: 16
The month with the most cloud cover is April (Cloud cover 31).
The months with the least cloud cover are August and September (Cloud cover 16).
Average visibility in September
Guernsey, WY
- 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).
Guernsey, Wyoming, USA
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