September weather forecastMcKinnon, WY
September
Weather in September
September, the first month of the autumn in McKinnon, is still a comfortable month, with an average temperature ranging between max 65.5°F (18.6°C) and min 45.5°F (7.5°C).Temperature
As August transitions into September, McKinnon sees a gentle drop in the average high-temperature, transitioning from a pleasant 73°F (22.8°C) to a refreshing 65.5°F (18.6°C). During September, the nighttime temperature in McKinnon averages of 45.5°F (7.5°C).Humidity
In September, the average relative humidity in McKinnon is 42%.Rainfall
In September, in McKinnon, the rain falls for 10.5 days. Throughout September, 0.94" (24mm) of precipitation is accumulated. In McKinnon, during the entire year, the rain falls for 93.9 days and collects up to 14.17" (360mm) of precipitation.Snowfall
Months with snowfall are January through June, September through December. September is the first month it typically snows in McKinnon. Throughout September, in the average 0.9 snowfall days, it receives 0.67" (17mm) of snow. Throughout the year, there are 84.4 snowfall days, and 56.22" (1428mm) of snow is accumulated.Daylight
In September, the average length of the day in McKinnon is 12h and 27min.On the first day of the month, sunrise is at 6:47 am and sunset at 7:51 pm. On the last day of September, sunrise is at 7:16 am and sunset at 7:02 pm MDT.
Sunshine
In September, the average sunshine is 10.5h.UV index
In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: A maximum UV index of 4 in September translates into the following recommendations:
Take necessary precautions - Suggestions to elude sunburn are provided. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
McKinnon, WY
- Average high temperature in September: 65.5°F
The warmest month (with the highest average high temperature) is July (75°F).
The month with the lowest average high temperature is December (27°F).
- Average low temperature in September: 45.5°F
The month with the highest average low temperature is July (53.2°F).
The coldest month (with the lowest average low temperature) is December (12.2°F).
Average pressure in September
McKinnon, WY
- Average pressure in September: 29.97"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
McKinnon, WY
- Average wind speed in September: 7mph
The windiest month (with the highest average wind speed) is April (9.4mph).
The calmest month (with the lowest average wind speed) is July (6.5mph).
Average humidity in September
McKinnon, WY
- Average humidity in September: 42%
The month with the highest relative humidity is February (79%).
The months with the lowest relative humidity are July and August (40%).
Average rainfall in September
McKinnon, WY
- Average rainfall in September: 0.94"
The wettest month (with the highest rainfall) is May (2.17").
The driest month (with the least rainfall) is January (0.67").
Average rainfall days in September
McKinnon, WY
- Average rainfall days in September: 10.5 days
The month with the highest number of rainy days is May (13.2 days).
The month with the least rainy days is November (3 days).
Average snowfall in September
McKinnon, WY
- Average snowfall in September: 0.67"
The month with the highest snowfall is March (9.57").
The months with the least snowfall are July and August (0").
Average snowfall days in September
McKinnon, WY
- Average snowfall days in September: 0.9 days
The month with the highest number of snowfall days is February (13.7 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
McKinnon, WY
- Average daylight in September: 12h and 30min
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 30min
The months with the most sunshine are July and August (Average sunshine: 11h and 36min).
The months with the least sunshine are January and December (Average sunshine: 6h and 24min).
Average sunshine days in September
McKinnon, WY
- Average sunshine days in September: 17.7 days
The month with the most sunshine days is November (19.9 days).
The month with the least sunshine days is May (11.5 days).
Average UV index in September
McKinnon, 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
McKinnon, WY
- Average cloud cover in September: 15
The month with the most cloud cover is February (Cloud cover 36).
The month with the least cloud cover is September (Cloud cover 15).
Average visibility in September
McKinnon, WY
- Average visibility in September: 6mi
The months with the highest visibility are January, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is February (5mi).
