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 beginning of September brings a minor change in the average high-temperature, shifting from a moderately hot 79.5°F (26.4°C) in August to a pleasant 72.5°F (22.5°C). Throughout September, Lyons registers a distinct decrease from daytime highs, reaching an average low of 47.3°F (8.5°C).Humidity
June, August and September, with an average relative humidity of 46%, are the least humid months in Lyons.Rainfall
In Lyons, during September, the rain falls for 11.9 days and regularly aggregates up to 1.22" (31mm) of precipitation. In Lyons, during the entire year, the rain falls for 134.2 days and collects up to 17.13" (435mm) of precipitation.Snowfall
June through September are months without snowfall in Lyons.Daylight
In Lyons, the average length of the day in September is 12h and 26min.On the first day of September in Lyons, Colorado, sunrise is at 6:29 am and sunset at 7:32 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:44 pm MDT.
Sunshine
In September, the average sunshine is 10.9h.UV index
The average daily maximum UV index in September in Lyons is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the average person.Note: The UV index of 4 during September leads to these advisories:
Take necessary precautions - Protection from skin and eye injury is mandatory. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Beware! Reflection from snow can magnify the Sun's UV radiation nearly twofold.
Frequently asked questions
What are September temperatures in Lyons?
What are the least humid months in Lyons?
What is the average humidity in September in Lyons?
How much does it rain in Lyons in September?
When it does not snow in Lyons?
Does it snow in Lyons in September?
What is the average length of the day in September in Lyons?
When is the sunrise / sunset in September in Lyons?
How many hours of sunshine does Lyons have in September?
What is the UV index intensity in September in Lyons?
Average temperature in September
Lyons, CO
- Average high temperature in September: 72.5°F
The warmest month (with the highest average high temperature) is July (80.6°F).
The month with the lowest average high temperature is December (35.4°F).
- Average low temperature in September: 47.3°F
The month with the highest average low temperature is July (54.5°F).
The coldest month (with the lowest average low temperature) is December (17.6°F).
Average pressure in September
Lyons, CO
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The months with the lowest atmospheric pressure are April and June (29.91"Hg).
Average wind speed in September
Lyons, CO
- Average wind speed in September: 5.6mph
The windiest month (with the highest average wind speed) is January (7.3mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).
Average humidity in September
Lyons, CO
- Average humidity in September: 46%
The month with the highest relative humidity is February (71%).
The months with the lowest relative humidity are June, August and September (46%).
Average rainfall in September
Lyons, CO
- Average rainfall in September: 1.22"
The wettest month (with the highest rainfall) is May (2.72").
The driest month (with the least rainfall) is January (0.55").
Average rainfall days in September
Lyons, CO
- Average rainfall days in September: 11.9 days
The month with the highest number of rainy days is July (20.4 days).
The month with the least rainy days is November (3.6 days).
Average snowfall in September
Lyons, CO
- Average snowfall in September: 0"
The month with the highest snowfall is April (8.39").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Lyons, CO
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is February (11 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Lyons, CO
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in September: 10h and 5min
The months with the most sunshine are June and July (Average sunshine: 11h and 42min).
The month with the least sunshine is February (Average sunshine: 6h and 36min).
Average sunshine days in September
Lyons, CO
- Average sunshine days in September: 14.2 days
The month with the most sunshine days is November (21.5 days).
The month with the least sunshine days is July (7.3 days).
Average UV index in September
Lyons, CO
- 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, October, November and December (UV index 2).
Average cloud cover in September
Lyons, CO
- Average cloud cover in September: 17
The months with the most cloud cover are April and May (Cloud cover 28).
The months with the least cloud cover are June and September (Cloud cover 17).
Average visibility in September
Lyons, CO
- 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).
Lyons, Colorado, USA
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