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
With the onset of September, Lewis's climate undergoes a slight change as the average high-temperature moves from a moderately hot 82°F (27.8°C) in August to a still warm 75°F (23.9°C). Lewis records a consistent low-temperature of 54.1°F (12.3°C) during September nights.Humidity
In Lewis, the average relative humidity in September is 40%.Rainfall
In Lewis, during September, the rain falls for 6.3 days and regularly aggregates up to 0.47" (12mm) of precipitation. Throughout the year, in Lewis, there are 78.9 rainfall days, and 9.84" (250mm) of precipitation is accumulated.Snowfall
May through September are months without snowfall.Daylight
In Lewis, the average length of the day in September is 12h and 25min.On the first day of the month, sunrise is at 6:45 am and sunset at 7:43 pm. On the last day of September, in Lewis, sunrise is at 7:10 am and sunset at 6:58 pm MDT.
Sunshine
In Lewis, the average sunshine in September is 10.9h.UV index
In Lewis, Colorado, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: The average daily UV index of 5 in September transforms into the following instructions:
Undertake protective steps - Preventing sun damage is advised. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. Employ a wide-brim hat for potent defense against up to 50% of UV rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Lewis in September?
What is the average humidity in September in Lewis?
How much does it rain in Lewis in September?
When it does not snow in Lewis?
Does it snow in Lewis in September?
How many hours of daylight does Lewis have in September?
When is the sunrise / sunset in September in Lewis?
How long on average sun shines in September in Lewis?
What is the UV index intensity in September in Lewis?
Average temperature in September
Lewis, CO
- Average high temperature in September: 75°F
The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (35.1°F).
- Average low temperature in September: 54.1°F
The month with the highest average low temperature is July (61.5°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).
Average pressure in September
Lewis, CO
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.23"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in September
Lewis, CO
- Average wind speed in September: 6.9mph
The windiest month (with the highest average wind speed) is April (9.3mph).
The calmest month (with the lowest average wind speed) is January (5.7mph).
Average humidity in September
Lewis, CO
- Average humidity in September: 40%
The month with the highest relative humidity is January (73%).
The month with the lowest relative humidity is June (26%).
Average rainfall in September
Lewis, CO
- Average rainfall in September: 0.47"
The wettest months (with the highest rainfall) are January and December (1.26").
The driest month (with the least rainfall) is June (0.2").
Average rainfall days in September
Lewis, CO
- Average rainfall days in September: 6.3 days
The month with the highest number of rainy days is July (9.6 days).
The month with the least rainy days is June (2.8 days).
Average snowfall in September
Lewis, CO
- Average snowfall in September: 0"
The month with the highest snowfall is January (8.11").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Lewis, CO
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and December (8.5 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Lewis, CO
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in September: 10h and 5min
The month with the most sunshine is June (Average sunshine: 12h and 6min).
The months with the least sunshine are January and December (Average sunshine: 6h and 30min).
Average sunshine days in September
Lewis, CO
- Average sunshine days in September: 21.9 days
The month with the most sunshine days is June (26.2 days).
The month with the least sunshine days is February (17.6 days).
Average UV index in September
Lewis, CO
- 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
Lewis, CO
- Average cloud cover in September: 10
The months with the most cloud cover are January and December (Cloud cover 27).
The month with the least cloud cover is June (Cloud cover 9).
Average visibility in September
Lewis, 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).
Lewis, Colorado, USA
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