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
Kirby's average high-temperature decreases in September, falling from a warm 83.7°F (28.7°C) in August to a still moderately hot 74.1°F (23.4°C). The temperature lowers to an average of 52.7°F (11.5°C) during September nights.Humidity
The average relative humidity in September in Kirby is 44%.Rainfall
In Kirby, Montana, in September, during 8.6 rainfall days, 0.83" (21mm) of precipitation is typically accumulated. In Kirby, during the entire year, the rain falls for 127.6 days and collects up to 14.25" (362mm) of precipitation.Snowfall
January through May, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.12" (3mm) of snow. Throughout the year, there are 65.3 snowfall days, and 28.82" (732mm) of snow is accumulated.Daylight
In September, the average length of the day is 12h and 31min.On the first day of September in Kirby, Montana, sunrise is at 6:30 am and sunset at 7:44 pm. On the last day of the month, sunrise is at 7:05 am and sunset at 6:49 pm MDT.
Sunshine
The average sunshine in September is 10.8h.UV index
The average daily maximum UV index in September in Kirby is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: In September, the maximum UV index of 4 transforms into these recommendations:
Undertake protective steps - Obligation to safeguard skin and eyes from harm is in place. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Be informed! The Sun's UV radiation can be nearly doubled due to the reflection from snow.
Frequently asked questions
What is the average September temperature in Kirby?
What is the average humidity in September in Kirby?
How much does it rain in Kirby in September?
When does it start to snow in Kirby?
How many hours of daylight does Kirby have in September?
When is the sunrise / sunset in September in Kirby?
How long on average sun shines in September in Kirby?
How high is the UV index in September in Kirby?
Average temperature in September
Kirby, MT
- Average high temperature in September: 74.1°F
The warmest month (with the highest average high temperature) is July (85.5°F).
The month with the lowest average high temperature is December (31.1°F).
- Average low temperature in September: 52.7°F
The month with the highest average low temperature is July (61.5°F).
The coldest months (with the lowest average low temperature) are January and February (16.2°F).
Average pressure in September
Kirby, MT
- Average pressure in September: 29.93"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in September
Kirby, MT
- Average wind speed in September: 7.6mph
The windiest month (with the highest average wind speed) is April (9.1mph).
The calmest months (with the lowest average wind speed) are July and December (6.8mph).
Average humidity in September
Kirby, MT
- Average humidity in September: 44%
The months with the highest relative humidity are January and February (79%).
The month with the lowest relative humidity is August (40%).
Average rainfall in September
Kirby, MT
- Average rainfall in September: 0.83"
The wettest month (with the highest rainfall) is May (2.64").
The driest month (with the least rainfall) is December (0.67").
Average rainfall days in September
Kirby, MT
- Average rainfall days in September: 8.6 days
The month with the highest number of rainy days is May (18 days).
The month with the least rainy days is January (6.3 days).
Average snowfall in September
Kirby, MT
- Average snowfall in September: 0.12"
The month with the highest snowfall is February (5.2").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Kirby, MT
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is February (14.3 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Kirby, MT
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in September: 10h and 5min
The months with the most sunshine are July and August (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 5h and 42min).
Average sunshine days in September
Kirby, MT
- Average sunshine days in September: 18.2 days
The month with the most sunshine days is September (18.2 days).
The month with the least sunshine days is May (9.6 days).
Average UV index in September
Kirby, MT
- Average UV index in September: 4
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Kirby, MT
- Average cloud cover in September: 18
The month with the most cloud cover is February (Cloud cover 41).
The months with the least cloud cover are July and August (Cloud cover 14).
Average visibility in September
Kirby, MT
- 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).
Kirby, Montana, USA
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