September weather forecast
Idaho Springs, CO

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The emerald water of St. Mary
The emerald water of St. Mary's Lake circled by green pine trees and vast hill ranges in Idaho Springs, Colorado

Weather in September

The first month of the autumn, September, is still a comfortable month in Idaho Springs, Colorado, with temperature in the range of an average high of 64.9°F (18.3°C) and an average low of 41°F (5°C).

Temperature

During the shift to September, Idaho Springs records a mild decrease in average high-temperature, moving from an agreeable 71.1°F (21.7°C) in August to a comfortable 64.9°F (18.3°C). Idaho Springs records a pronounced decline from the day's peak to an average nighttime low-temperature of 41°F (5°C) throughout September.

Humidity

In Idaho Springs, Colorado, the average relative humidity in September is 52%.

Rainfall

In Idaho Springs, during September, the rain falls for 9.4 days and regularly aggregates up to 0.55" (14mm) of precipitation. Throughout the year, there are 96 rainfall days, and 10.08" (256mm) of precipitation is accumulated.

Snowfall

January through December are months with snowfall in Idaho Springs. In September, in Idaho Springs, it is snowing for 1.5 days. Throughout September, 0.39" (10mm) of snow is accumulated. Throughout the year, there are 74.9 snowfall days, and 35.39" (899mm) of snow is accumulated.

Daylight

The average length of the day in September is 12h and 26min.
On the first day of September, sunrise is at 6:30 am and sunset at 7:32 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 6:45 pm MDT.

Sunshine

In Idaho Springs, the average sunshine in September is 10.6h.

UV index

The average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for average individuals.
Note: The maximum daily UV index of 3 in September converts into the following recommendations:
Prioritize safety - Recommendations to avert sunburn are shared. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes. On your guard! Snow's reflection can almost double the intensity of the Sun's UV radiation.
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Frequently asked questions

What is the average September temperature in Idaho Springs?

The high-temperature, in September, in Idaho Springs, records 64.9°F (18.3°C), while the low-temperature is 41°F (5°C).

What is the average humidity in September in Idaho Springs?

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

How many days does it rain in September in Idaho Springs?

In Idaho Springs, Colorado, during September, the rain falls for 9.4 days and regularly aggregates up to 0.55" (14mm) of precipitation.

How many days does it snow in September in Idaho Springs?

In Idaho Springs, Colorado, in September, snow falls for 1.5 days, with typically accumulated 0.39" (10mm) of snow.

What is the average length of the day in September in Idaho Springs?

In Idaho Springs, the average day length in September is 12h and 26min.

When are sunrise and sunset in September in Idaho Springs?

On the first day of September in Idaho Springs, Colorado, sunrise is at 6:30 am and sunset at 7:32 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 6:45 pm MDT.

How many hours of sunshine does Idaho Springs have in September?

The average sunshine duration in September in Idaho Springs, Colorado, is 10.6h.

What is the UV index intensity in September in Idaho Springs?

In September, the average daily maximum UV index is 3. A UV Index of 3 to 5 symbolizes a medium health risk from exposure to Sun's UV rays.
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
Idaho Springs, CO

Average temperature in September - Idaho Springs, CO
  • Average high temperature in September: 64.9°F

The warmest month (with the highest average high temperature) is July (72.3°F).
The month with the lowest average high temperature is December (29.3°F).

  • Average low temperature in September: 41°F

The month with the highest average low temperature is July (46.9°F).
The coldest month (with the lowest average low temperature) is February (11.3°F).

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Average pressure in September
Idaho Springs, CO

Average pressure in September - Idaho Springs, CO
  • Average pressure in September: 30.03"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is April (29.92"Hg).

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Average wind speed in September
Idaho Springs, CO

Average wind speed in September - Idaho Springs, CO
  • Average wind speed in September: 5.8mph

The windiest month (with the highest average wind speed) is January (9mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).

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Average humidity in September
Idaho Springs, CO

Average humidity in September - Idaho Springs, CO
  • Average humidity in September: 52%

The month with the highest relative humidity is February (78%).
The month with the lowest relative humidity is June (50%).

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Average rainfall in September
Idaho Springs, CO

Average rainfall in September - Idaho Springs, CO
  • Average rainfall in September: 0.55"

The wettest month (with the highest rainfall) is July (1.65").
The driest month (with the least rainfall) is December (0.28").

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Average rainfall days in September
Idaho Springs, CO

Average rainfall days in September - Idaho Springs, CO
  • Average rainfall days in September: 9.4 days

The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is November (2.2 days).

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Average snowfall in September
Idaho Springs, CO

Average snowfall in September - Idaho Springs, CO
  • Average snowfall in September: 0.39"

The month with the highest snowfall is March (6.73").
The months with the least snowfall are July and August (0.04").

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Average snowfall days in September
Idaho Springs, CO

Average snowfall days in September - Idaho Springs, CO
  • Average snowfall days in September: 1.5 days

The month with the highest number of snowfall days is March (11.6 days).
The months with the least snowfall days are July and August (0.1 days).

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Average daylight in September /
Average sunshine in September
Idaho Springs, CO

Average daylight in September / Average sunshine in September - Idaho Springs, CO
  • Average daylight in September: 12h and 2min

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

  • Average sunshine in September: 10h and 4min

The month with the most sunshine is June (Average sunshine: 11h and 18min).
The month with the least sunshine is February (Average sunshine: 6h and 12min).

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Average sunshine days in September
Idaho Springs, CO

Average sunshine days in September - Idaho Springs, CO
  • Average sunshine days in September: 16.9 days

The month with the most sunshine days is November (23.2 days).
The month with the least sunshine days is July (9.8 days).

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Average UV index in September
Idaho Springs, CO

Average UV index in September - Idaho Springs, CO
  • Average UV index in September: 3

The months with the highest UV index are June, July and August (UV index 4).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).

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Average cloud cover in September
Idaho Springs, CO

Average cloud cover in September - Idaho Springs, CO
  • Average cloud cover in September: 21

The months with the most cloud cover are February, April and May (Cloud cover 35).
The month with the least cloud cover is June (Cloud cover 20).

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Average visibility in September
Idaho Springs, CO

Average visibility in September - Idaho Springs, CO
  • 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).

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Idaho Springs, Colorado, USA

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