September weather forecast
Montrose, CA

Share

Weather in September

September, the first month of the autumn in Montrose, is still a warm month, with an average temperature fluctuating between 83.8°F (28.8°C) and 63.1°F (17.3°C).

Temperature

September's arrival brings an average high-temperature of a still moderately hot 83.8°F (28.8°C), slightly deviating from August's 85.6°F (29.8°C). The average low-temperature in Montrose during September nights is an enjoyable 63.1°F (17.3°C).

Heat index

September's average heat index is evaluated at a hot 86°F (30°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Always consider that heat index estimations are for light winds and places in the shade. When under direct sunshine, the heat index may be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', determines the feeling of heat when you account for the relative humidity. A person's impression of weather can be shaped by several aspects, among them metabolic variations, pregnancy, and levels of physical activity. Do note, being directly under sun rays can amplify the heat you feel, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. Young people are generally more susceptible than adults because they perspire less. Furthermore, their proportionally larger skin surface to their petite bodies and the increased heat output from their actions add to the risk.

Humidity

In Montrose, the average relative humidity in September is 52%.

Rainfall

In Montrose, in September, it is raining for 2.9 days, with typically 0.16" (4mm) of accumulated precipitation. In Montrose, California, during the entire year, the rain falls for 50.4 days and collects up to 8.35" (212mm) of precipitation.

Snowfall

January through November are months without snowfall in Montrose.

Daylight

In September, the average length of the day is 12h and 22min.
On the first day of September, sunrise is at 6:26 am and sunset at 7:18 pm. On the last day of the month, sunrise is at 6:47 am and sunset at 6:37 pm PDT.

Sunshine

The average sunshine in September is 10.8h.

UV index

The months with the highest UV index in Montrose, California, are June through September, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In September, a daily maximum UV index of 6 leads to the following instructions:
Adhere to precautions and respect sun safety doctrines. Avoiding sunburn is vital. Avoid direct Sun exposure and seek shade between 10 a.m. and 4 p.m., when UV radiation is at its peak, but keep in mind that not all shade structures provide complete protection. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.
[Resources]

Frequently asked questions

How hot is September in Montrose?

Montrose in September has an average high-temperature of 83.8°F (28.8°C) and an average low-temperature of 63.1°F (17.3°C). The average heat index (a.k.a. 'apparent temperature', 'feels like'), which calculates the temperature value influenced by the moisture in the air, in September is evaluated at 86°F (30°C).

What is the average humidity in September in Montrose?

In September, the average relative humidity in Montrose is 52%.

How much does it rain in Montrose in September?

In Montrose, California, during September, the rain falls for 2.9 days and regularly aggregates up to 0.16" (4mm) of precipitation.

When it does not snow in Montrose?

January through November are months without snowfall in Montrose.

What is the average length of the day in September in Montrose?

The average day length in September in Montrose, California, is 12h and 22min.

When is the sunrise / sunset in September in Montrose?

In September, on the first day of the month, sunrise is at 6:26 am and sunset at 7:18 pm. On the last day of the month, in Montrose, sunrise is at 6:47 am and sunset at 6:37 pm PDT.

How long on average sun shines in September in Montrose?

In September, the average sunshine duration is 10.8h.

What is the month with the highest UV index in Montrose?

June through September, with an average maximum UV index of 6, are months with the highest UV index.

What is the UV index intensity in September in Montrose?

In September, the average daily maximum UV index in Montrose is 6. A UV Index value of 6 to 7 symbolizes a high health risk from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Montrose, CA

Average temperature in September - Montrose, CA
  • Average high temperature in September: 83.8°F

The warmest month (with the highest average high temperature) is August (85.6°F).
The month with the lowest average high temperature is December (62.4°F).

  • Average low temperature in September: 63.1°F

The month with the highest average low temperature is August (64.8°F).
The coldest month (with the lowest average low temperature) is December (47.3°F).

[Resources]

Average pressure in September
Montrose, CA

Average pressure in September - Montrose, CA
  • Average pressure in September: 29.89"Hg

The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).

[Resources]

Average wind speed in September
Montrose, CA

Average wind speed in September - Montrose, CA
  • Average wind speed in September: 4.4mph

The windiest month (with the highest average wind speed) is April (5.8mph).
The calmest month (with the lowest average wind speed) is September (4.4mph).

[Resources]

Average humidity in September
Montrose, CA

Average humidity in September - Montrose, CA
  • Average humidity in September: 52%

The month with the highest relative humidity is June (60%).
The month with the lowest relative humidity is November (48%).

[Resources]

Average rainfall in September
Montrose, CA

Average rainfall in September - Montrose, CA
  • Average rainfall in September: 0.16"

The wettest month (with the highest rainfall) is February (1.77").
The driest month (with the least rainfall) is June (0.04").

[Resources]

Average rainfall days in September
Montrose, CA

Average rainfall days in September - Montrose, CA
  • Average rainfall days in September: 2.9 days

The month with the highest number of rainy days is March (7.1 days).
The month with the least rainy days is June (1.1 days).

[Resources]

Average snowfall days in September
Montrose, CA

Average snowfall days in September - Montrose, CA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is December (0.1 days).
The months with the least snowfall days are January, February, March, April, May, June, July, August, September, October and November (0 days).

[Resources]

Average daylight in September /
Average sunshine in September
Montrose, CA

Average daylight in September / Average sunshine in September - Montrose, CA
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).

  • Average sunshine in September: 10h and 5min

The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The months with the least sunshine are January, February and December (Average sunshine: 6h and 54min).

[Resources]

Average sunshine days in September
Montrose, CA

Average sunshine days in September - Montrose, CA
  • Average sunshine days in September: 25 days

The month with the most sunshine days is June (26.9 days).
The month with the least sunshine days is February (21 days).

[Resources]

Average UV index in September
Montrose, CA

Average UV index in September - Montrose, CA
  • Average UV index in September: 6

The months with the highest UV index are June, July, August and September (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 4).

[Resources]

Average cloud cover in September
Montrose, CA

Average cloud cover in September - Montrose, CA
  • Average cloud cover in September: 7

The months with the most cloud cover are March and December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 5).

[Resources]

Average visibility in September
Montrose, CA

Average visibility in September - Montrose, CA
  • 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).

[Resources]

Montrose, California, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location