September weather forecastMontrose, CO
September
Weather in September
Montrose kickstarts the fall season in September with temperature ranges normalizing from the summer's peak. There is noticeable relief from the summer heat, yet weather stays warm to a comfortable extent. The gradual departure from summer climatic conditions resonates with the slight decrease in daylight hours. Very minimal snowfall begins to return to the forecast for Montrose. Despite the changes, September still encapsulates a generally favorable weather condition for outdoor activities.Temperature
Montrose's progression into September involves a gentle drop in the average high-temperature, from 82°F (27.8°C) in August to a still warm 74.5°F (23.6°C). Montrose notes a substantial temperature decline from the daytime peaks throughout September, with an average nighttime temperature of 48.7°F (9.3°C).Humidity
The average relative humidity in September is 43%.Rainfall
In September, the rain falls for 7.6 days. Throughout September, 0.67" (17mm) of precipitation is accumulated. In Montrose, during the entire year, the rain falls for 104.5 days and collects up to 9.84" (250mm) of precipitation.Snowfall
In Montrose, snow does not fall in June through September.Daylight
In Montrose, the average length of the day in September is 12h and 25min.On the first day of September in Montrose, Colorado, sunrise is at 6:41 am and sunset at 7:40 pm. On the last day of the month, sunrise is at 7:07 am and sunset at 6:55 pm MDT.
Sunshine
The average sunshine in September is 11h.UV index
In Montrose, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the average person.Note: A maximum daily UV index of 4 during September morphs into the following directions:
Preventative actions are necessary - The mandate to avoid skin and eye damage is in place. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Montrose, CO
- Average high temperature in September: 74.5°F
The warmest month (with the highest average high temperature) is July (84°F).
The month with the lowest average high temperature is January (33.4°F).
- Average low temperature in September: 48.7°F
The month with the highest average low temperature is July (55.9°F).
The coldest month (with the lowest average low temperature) is January (15.3°F).
Average pressure in September
Montrose, CO
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.25"Hg).
The month with the lowest atmospheric pressure is May (29.92"Hg).
Average wind speed in September
Montrose, CO
- Average wind speed in September: 6mph
The windiest month (with the highest average wind speed) is June (7.6mph).
The calmest month (with the lowest average wind speed) is January (4.4mph).
Average humidity in September
Montrose, CO
- Average humidity in September: 43%
The month with the highest relative humidity is January (79%).
The month with the lowest relative humidity is June (32%).
Average rainfall in September
Montrose, CO
- Average rainfall in September: 0.67"
The wettest month (with the highest rainfall) is March (1.18").
The driest month (with the least rainfall) is June (0.47").
Average rainfall days in September
Montrose, CO
- Average rainfall days in September: 7.6 days
The month with the highest number of rainy days is April (12.4 days).
The month with the least rainy days is November (6.1 days).
Average snowfall in September
Montrose, CO
- Average snowfall in September: 0"
The month with the highest snowfall is December (6.22").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Montrose, CO
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (11.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Montrose, CO
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 11h and 0min
The month with the most sunshine is June (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 6h and 18min).
Average sunshine days in September
Montrose, CO
- Average sunshine days in September: 19.6 days
The month with the most sunshine days is November (21.6 days).
The month with the least sunshine days is April (13.3 days).
Average UV index in September
Montrose, CO
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, October, November and December (UV index 2).
Average cloud cover in September
Montrose, CO
- Average cloud cover in September: 11
The months with the most cloud cover are January and February (Cloud cover 30).
The months with the least cloud cover are June and September (Cloud cover 11).
Average visibility in September
Montrose, CO
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
