September weather forecastEnnis, MT
September
Weather in September
September is a picturesque period in Ennis. The shift from the heat of August towards cooler autumn temperatures is a respite. There is a marginal decline in temperature and a slight increase in rainfall, signaling the onset of the fall season. The changing foliage and the falling leaves craft a beautiful autumnal landscape. The weather still allows for impressive outdoor excursions, making September an inviting period for a fall getaway.Temperature
The beginning of September marks a decrease in the average high-temperature, transitioning from an agreeable 73°F (22.8°C) in August to an enjoyable 63.5°F (17.5°C). A noticeable temperature swing characterizes Ennis's September nights, dipping to an average of 39.9°F (4.4°C).Humidity
The average relative humidity in September is 56%.Rainfall
In Ennis, Montana, in September, during 10.3 rainfall days, 1.61" (41mm) of precipitation is typically accumulated. Throughout the year, in Ennis, there are 105.7 rainfall days, and 17.99" (457mm) of precipitation is accumulated.Snowfall
Months with snowfall in Ennis are January through December. In Ennis, Montana, in September, during 3.9 snowfall days, 4.37" (111mm) of snow is typically accumulated. Throughout the year, there are 136.1 snowfall days, and 86.93" (2208mm) of snow is accumulated.Daylight
In Ennis, the average length of the day in September is 12h and 31min.On the first day of the month, sunrise is at 6:49 am and sunset at 8:03 pm. On the last day of September, sunrise is at 7:24 am and sunset at 7:08 pm MDT.
Sunshine
In September, the average sunshine is 9.7h.UV index
The average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: The maximum UV index of 3 during September translates into these guidelines:
Undertake precautions - Obligation exists to protect against skin and eye damage. The Sun's radiation is especially intense around midday; try to stay in shade during this period. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Ennis, MT
- Average high temperature in September: 63.5°F
The warmest month (with the highest average high temperature) is July (74.5°F).
The month with the lowest average high temperature is December (22.3°F).
- Average low temperature in September: 39.9°F
The month with the highest average low temperature is August (46°F).
The coldest month (with the lowest average low temperature) is December (7.7°F).
Average pressure in September
Ennis, MT
- Average pressure in September: 29.99"Hg
The month with the highest atmospheric pressure is January (30.22"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Ennis, MT
- Average wind speed in September: 5.3mph
The windiest month (with the highest average wind speed) is January (7.1mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in September
Ennis, MT
- Average humidity in September: 56%
The month with the highest relative humidity is February (90%).
The month with the lowest relative humidity is August (50%).
Average rainfall in September
Ennis, MT
- Average rainfall in September: 1.61"
The wettest month (with the highest rainfall) is May (2.36").
The driest month (with the least rainfall) is December (0.75").
Average rainfall days in September
Ennis, MT
- Average rainfall days in September: 10.3 days
The month with the highest number of rainy days is June (16.5 days).
The month with the least rainy days is November (2.9 days).
Average snowfall in September
Ennis, MT
- Average snowfall in September: 4.37"
The month with the highest snowfall is April (14.76").
The month with the least snowfall is August (0.08").
Average snowfall days in September
Ennis, MT
- Average snowfall days in September: 3.9 days
The month with the highest number of snowfall days is April (19.9 days).
The month with the least snowfall days is August (0.3 days).
Average daylight in September /
Average sunshine in September
Ennis, MT
- Average daylight in September: 12h and 30min
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: 9h and 42min
The month with the most sunshine is July (Average sunshine: 11h and 36min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).
Average sunshine days in September
Ennis, MT
- Average sunshine days in September: 14.5 days
The month with the most sunshine days is January (16.3 days).
The month with the least sunshine days is April (6.9 days).
Average UV index in September
Ennis, MT
- Average UV index in September: 3
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January and February (UV index 1).
Average cloud cover in September
Ennis, MT
- Average cloud cover in September: 23
The month with the most cloud cover is February (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 17).
Average visibility in September
Ennis, MT
- Average visibility in September: 6mi
The months with the highest visibility are June, July, August, September and October (6mi).
The months with the lowest visibility are January, February and December (4mi).
