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
Start of September brings a slight shift in the average high-temperature, dipping a bit from August's moderately hot 74.3°F (23.5°C) to a comfortable 67.6°F (19.8°C). An average low-temperature of 47.1°F (8.4°C) is common in Lyman during the nights of September.Humidity
In September, the average relative humidity is 42%.Rainfall
In Lyman, during September, the rain falls for 8.4 days and regularly aggregates up to 0.59" (15mm) of precipitation. In Lyman, during the entire year, the rain falls for 71.2 days and collects up to 9.84" (250mm) of precipitation.Snowfall
January through June, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.5 snowfall days, it receives 0.16" (4mm) of snow. In Lyman, during the entire year, snow falls for 64.4 days and aggregates up to 44.17" (1122mm) of snow.Daylight
In September, the average length of the day is 12h and 25min.On the first day of September, sunrise is at 6:56 am and sunset at 7:55 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 7:10 pm MDT.
Sunshine
In September, the average sunshine is 9.9h.UV index
The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for average individuals.Note: The UV index of 4 in September translates into these instructions:
Take care. Persons with lighter skin might suffer burns in less than 30 minutes. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection. Consider carefully! The reflective quality of snow can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Lyman in September?
What is the average humidity in September?
How many days does it rain in September?
When does it start to snow?
What is the average length of the day in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Lyman have in September?
What is the UV index reading in September?
Average temperature in September
Lyman, UT
- Average high temperature in September: 67.6°F
The warmest month (with the highest average high temperature) is July (76.3°F).
The month with the lowest average high temperature is January (30.2°F).
- Average low temperature in September: 47.1°F
The month with the highest average low temperature is July (55°F).
The coldest month (with the lowest average low temperature) is January (12.6°F).
Average pressure in September
Lyman, UT
- Average pressure in September: 29.94"Hg
The month with the highest atmospheric pressure is January (30.23"Hg).
The month with the lowest atmospheric pressure is June (29.83"Hg).
Average wind speed in September
Lyman, UT
- Average wind speed in September: 6.2mph
The windiest month (with the highest average wind speed) is April (8.2mph).
The calmest month (with the lowest average wind speed) is July (5.5mph).
Average humidity in September
Lyman, UT
- Average humidity in September: 42%
The month with the highest relative humidity is January (81%).
The month with the lowest relative humidity is June (32%).
Average rainfall in September
Lyman, UT
- Average rainfall in September: 0.59"
The wettest month (with the highest rainfall) is July (1.26").
The driest month (with the least rainfall) is June (0.43").
Average rainfall days in September
Lyman, UT
- Average rainfall days in September: 8.4 days
The month with the highest number of rainy days is July (13.2 days).
The month with the least rainy days is November (1.7 days).
Average snowfall in September
Lyman, UT
- Average snowfall in September: 0.16"
The month with the highest snowfall is March (8.07").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Lyman, UT
- Average snowfall days in September: 0.5 days
The month with the highest number of snowfall days is December (11.1 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Lyman, UT
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 9h and 5min
The month with the most sunshine is August (Average sunshine: 11h and 36min).
The month with the least sunshine is January (Average sunshine: 5h and 54min).
Average sunshine days in September
Lyman, UT
- Average sunshine days in September: 18.5 days
The month with the most sunshine days is November (22.8 days).
The month with the least sunshine days is July (13.3 days).
Average UV index in September
Lyman, UT
- 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, October, November and December (UV index 2).
Average cloud cover in September
Lyman, UT
- Average cloud cover in September: 12
The month with the most cloud cover is February (Cloud cover 37).
The month with the least cloud cover is September (Cloud cover 12).
Average visibility in September
Lyman, UT
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is January (4mi).
Lyman, Utah, USA
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