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 advent of September brings a subtle shift in temperature, with the average high moving from a moderately hot 76.6°F (24.8°C) in August to a pleasant 68.5°F (20.3°C). In the month of September, Lyman records a consistent average low-temperature of 47.8°F (8.8°C).Humidity
In September, the average relative humidity is 39%.Rainfall
In Lyman, in September, it is raining for 8 days, with typically 0.79" (20mm) of accumulated precipitation. Throughout the year, in Lyman, there are 112.2 rainfall days, and 11.57" (294mm) of precipitation is accumulated.Snowfall
January through June, September through December are months with snowfall in Lyman. September is the first month it typically snows. Throughout September, in the average 0.7 snowfall days, it receives 0.43" (11mm) of snow. Throughout the year, there are 85.7 snowfall days, and 41.18" (1046mm) of snow is accumulated.Daylight
The average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 6:48 am and sunset at 7:53 pm. On the last day of September, sunrise is at 7:17 am and sunset at 7:04 pm MDT.
Sunshine
The average sunshine in September is 10.5h.UV index
In Lyman, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the average person.Note: The daily maximum UV index of 4 in September interprets into the following advice:
Act with care - The suggestion to avoid sunburn is emphasized. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
Frequently asked questions
What is the average September temperature in Lyman?
What is the average humidity in September in Lyman?
How many days does it rain in September in Lyman?
When does it start to snow in Lyman?
What is the average length of the day in September in Lyman?
What time are sunrise and sunset in September in Lyman?
How long on average sun shines in September in Lyman?
What is the UV index reading in September in Lyman?
Average temperature in September
Lyman, WY
- Average high temperature in September: 68.5°F
The warmest month (with the highest average high temperature) is July (78.4°F).
The month with the lowest average high temperature is December (26.6°F).
- Average low temperature in September: 47.8°F
The month with the highest average low temperature is July (55.6°F).
The coldest month (with the lowest average low temperature) is January (12.2°F).
Average pressure in September
Lyman, WY
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.28"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in September
Lyman, WY
- Average wind speed in September: 8.8mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is July (7.6mph).
Average humidity in September
Lyman, WY
- Average humidity in September: 39%
The months with the highest relative humidity are January and February (82%).
The months with the lowest relative humidity are July and August (36%).
Average rainfall in September
Lyman, WY
- Average rainfall in September: 0.79"
The wettest month (with the highest rainfall) is May (2.01").
The driest months (with the least rainfall) are January and July (0.63").
Average rainfall days in September
Lyman, WY
- Average rainfall days in September: 8 days
The month with the highest number of rainy days is May (16.1 days).
The month with the least rainy days is November (6 days).
Average snowfall in September
Lyman, WY
- Average snowfall in September: 0.43"
The month with the highest snowfall is March (8.78").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Lyman, WY
- Average snowfall days in September: 0.7 days
The month with the highest number of snowfall days is March (15.1 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Lyman, WY
- 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: 10h and 3min
The months with the most sunshine are July and August (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 6h and 24min).
Average sunshine days in September
Lyman, WY
- Average sunshine days in September: 18.8 days
The month with the most sunshine days is October (19.2 days).
The month with the least sunshine days is April (9.4 days).
Average UV index in September
Lyman, WY
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).
Average cloud cover in September
Lyman, WY
- Average cloud cover in September: 13
The month with the most cloud cover is February (Cloud cover 36).
The month with the least cloud cover is August (Cloud cover 12).
Average visibility in September
Lyman, WY
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).
Lyman, Wyoming, USA
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