Dillon
Colorado, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Dillon, CO

A great autumn shot of the brown and golden trees near the iconic Dillon reservoir in Colorado, a far view of forests and high mountain ridges
A great autumn shot of the brown and golden trees near the iconic Dillon reservoir in Colorado, a far view of forests and high mountain ridges
September, the first month of the autumn, in Dillon, is still a comfortable month, with average temperature ranging between min 28.8°F (-1.8°C) and max 66.2°F (19°C).

Temperature

In September, the average high-temperature slightly decreases, from a pleasant 72.5°F (22.5°C) in August, to an enjoyable 66.2°F (19°C). In Dillon, the average low-temperature is 28.8°F (-1.8°C).

Rainfall

In Dillon, 1.4" (34.3mm) of precipitation is typically accumulated. Throughout the year, in Dillon, 16" (407.4mm) of rain is accumulated.

Snowfall

January through June, September through December are months with snowfall. September is the first month it typically snows in Dillon. Throughout September, Dillon receives 1.7" (43.2mm) of snow. Throughout the year, 127.5" (3238.4mm) of snow is accumulated.

Daylight

In September, the average length of the day is 12.4h.

What is the temperature in September in Dillon?

In Dillon, in September, the average high-temperature is 66.2°F (19°C), and the average low-temperature is 28.8°F (-1.8°C).

How much does it rain in Dillon in September?

Throughout September, 1.4" (34.3mm) of precipitation is accumulated.

When does it start to snow in Dillon?

September is the first month it typically snows in Dillon, Colorado. Throughout September, Dillon receives 1.7" (43.2mm) of snow.

How many hours of daylight does Dillon have in September?

The average length of the day in September in Dillon, Colorado, is 12.4h.
Average temperature in September - Dillon, CO
  • Average high temperature in September: 66.2°F

The warmest month (with the highest average high temperature) is July (74.2°F).
The month with the lowest average high temperature is January (31.3°F).

  • Average low temperature in September: 28.7°F

The month with the highest average low temperature is July (37.1°F).
The coldest month (with the lowest average low temperature) is January (-1.1°F).

Average rainfall in September - Dillon, CO
  • Average rainfall in September: 1.4"

The wettest month (with the highest rainfall) is July (1.9").
The driest month (with the lowest rainfall) is November (1").

Average snowfall in September - Dillon, CO
  • Average snowfall in September: 1.7"

The month with the highest snowfall is March (22.1").
Months with the lowest snowfall are July and August (0").

Average daylight in September - Dillon, CO
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.9h).
The month with shortest days is December (Average daylight: 9.4h).