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Keystone weather in September

Weather in Keystone: September


	Average day temperature:	76.7°F
	Average night temperature:	59.3°F

	Number of sunny days:	24 days
	Day length:	11.8 - 13.2 hours

	Number of rainy days:	1 day
	Precipitation totals:	0.3 in.

more information

14 days
forecast

Keystone

weather in
October

Keystone

January
February
March
April

May
June
July
August

September
October
November
December

Show year:

2024

2023

2022

105

120

Day temperature

Night temperature

The highest day temperature during September of 2024 was 89°F. At the same time the lowest night temperature was 43°F. Daily and nightly averages during September were 73.9°F and 57.8°F.

	Sunny days
	Partly cloudy days
	Cloudy days

80%

17%

Mostly all days in September are sunny but cloudy days are also possible.

jan

feb

mar

apr

may

jun

jul

aug

sep

oct

nov

dec

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.2

Precipitation total value in Keystone in September is 0.3 in. Other months of the year show relatively similar values.

jan

feb

mar

apr

may

jun

jul

aug

sep

oct

nov

dec

0.0

1.6

3.3

4.9

6.6

8.2

9.9

11.5

8.9

8.5

7.9

7.5

7.4

7.8

8.5

9.6

8.6

9.1

8.4

8.9

8.5

7.9

7.6

7.5

7.4

7.8

8.5

9.6

8.6

9.1

8.4

The average wind speed value in September is 7.6 mph It makes September one of the least windy months of the year.

jan

feb

mar

apr

may

jun

jul

aug

sep

oct

nov

dec

0.0

2.0

3.9

5.9

7.9

9.8

11.8

13.8

5.9

6.9

8.4

11.1

11.5

10.7

8.5

8.3

7.1

6.2

5.8

5.9

6.9

8.4

10.4

11.1

11.5

10.7

8.5

8.3

7.1

6.2

5.8

This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in September is: 10.4.