Measurements:
°C
°F
Keystone
10°F
S 4 mph
Feels like: -6°F
Precip: 0%
World Resorts USA Keystone Weather September Weather in Keystone

Keystone Weather: September

Average Day Temperature: 64.3°F
Average Night Temperature: 38.1°F
Number of Sunny Days: 19 days
Sunshine Hours: 11.8 - 13.0 hours
Number of Rainy Days: 2 days
Precipitation Totals: 0.8 in

Air Temperature in September, °F

Select Year: 2024 2023 2022
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
0
12
24
36
48
60
72
84
Day Temperature   
Night Temperature

The highest day temperature in September 2024 was 70°F. The lowest night temperature was 28°F. The average values for day and night temperatures during September were 63.1°F и 35.4°F respectivly.

Sunny, Cloudy and Gloomy days
Sunny days
Cloudy days
Gloomy days
61%
29%
10%

Most of the days in September are sunny but you can also expect cloudy and gloomy days.

Precipitation Totals in September, in

Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
0.0
0.2
0.5
0.7
1.0
1.2
1.4
1.7

Precipitation total in September for Keystone is 0.8 in. It makes september one of the least rainy months of the year.

Wind Speed in September, mph
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
0.0
1.2
2.4
3.5
4.7
5.9
7.1
8.3

The average wind speed in September is 4.9 mph. This value is relatively stable throughout the year.

Average Sunny Hours Per Day
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
0.0
1.7
3.4
5.1
6.8
8.6
10.3
12.0
13.7

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Keystone in September is 9.5 hours.

Best Time to Visit Keystone
The most sunny months:
September 19 days
October 19 days
November 17 days
The most warm months:
July 72.6 °F
August 71.0 °F
June 64.9 °F
The most cold months:
January 20.9 °F
February 21.8 °F
December 24.3 °F
The most rainy months:
August 3 days
June 2 days
September 2 days
The most windy months:
April 7 mph
May 6 mph
June 6 mph

Keystone on the Weather Map

USA Resorts:
NAME
Boston +48
Chicago +36
Hawaii +80
Honolulu +80
Houston +70
Las Vegas +62
Los Angeles +64
Miami +76
New York +46
Orlando +78
San Diego +62
San Francisco +46
Sarasota +72
Tampa +74
Washington +52
24 Hours Weather Forecast
Keystone
Local time: 16:47
31 dec, tuesday
1800 10°F
S
4 mph
2100 2°F
SE
1 mph
01 jan, wednesday
0000 -8°F
N
2 mph
0300 -10°F
N
2 mph
0600 -12°F
N
2 mph
0900 -4°F
NE
2 mph
1200 8°F
E
6 mph
1500 14°F
E
9 mph