Koesan in september: average Weather, Temperature and Climate
Weather in Koesan in september 2025
The weather in Koesan in the month of september comes from statistical datas on the past years. You can view the weather statistics for the whole month, but also by using the tabs for the beginning, the middle and the end of the month.
Average weather throughout september
good weather UV index: 6
Weather at 6am
59°F
Fog
37% of time
28%
14%
12%
Weather at 12pm
74°F
Clear/Sunny
46% of time
24%
21%
6%
Weather at 6pm
72°F
Clear/Sunny
43% of time
22%
22%
10%
Weather at 3am
61°F
32%
28%
16%
13%
Evolution of daily average temperature and precipitation in Koesan in september
These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in Koesan in september.
The climate of Koesan in september is good
The weather in september in Koesan is rather dry (with 7in of precipitation over 5 days). The weather is better from the previous month since in august it receives an average of 10.9in of precipitation over 13 days.
The climate nice there september. The high seasonal norm is 77°F. In the morning the temperature drops to 59°F. Thus, the mean temperature average in september in Koesan is 68°F. Note that seasonal normals in contrast with those observed in Koesan in september with a maximum record of 90°F in 2020 and a minimum record of 36°F in 2010.
Day length in Koesan in september is 12:26. The sun rises at 06:11 and sets at 18:37.
With a good weather, september is a good time to go in this city.
Seasonal average climate and temperature of Koesan in september
Check below seasonal norms These datas are set from the weather statements of the past years of september.
| September | |||||
| Outside temperature | |||||
| Average temperature | 68°F | ||||
| Highest temperature | 77°F | ||||
| Lowest temperature | 59°F | ||||
| Highest record temperature | 90°F (2020) | ||||
| Lowest record temperature | 36°F (2010) | ||||
| Number of days at +86°F | 1 day(s) (3%) | ||||
| Number of days at +65°F | 29 day(s) (97%) | ||||
| Wind | |||||
| Wind speed | 9km/h | ||||
| Wind temperature | 59°F | ||||
| Precipitation (rainfall) | |||||
| Rainfall | 7in | ||||
| Number of days with rainfall | 5 day(s) (18%) | ||||
| Record daily rainfall | 7.3in (2021) | ||||
| Other climate data | |||||
| Humidity | 93% | ||||
| Visibility | 8.36km | ||||
| Cloud cover | 37% | ||||
| UV index | 6 | ||||
| Daily sunshine hours | 11 | ||||
| Sunrise and sunset | |||||
| Time of sunrise | 06:11 | ||||
| Time of sunset | 18:37 | ||||
| Length of day | 12:26 | ||||
| Our opinion about the weather in september | |||||
| Our opinion at whereandwhen.net | good | ||||
How was the weather last september?
Here is the day by day recorded weather in Koesan in september 2024:
67°F to 86°F
65°F to 74°F
67°F to 83°F
61°F to 86°F
68°F to 85°F
74°F to 79°F
70°F to 85°F
72°F to 88°F
72°F to 88°F
70°F to 90°F
72°F to 92°F
76°F to 79°F
72°F to 81°F
72°F to 86°F
72°F to 85°F
68°F to 88°F
74°F to 86°F
74°F to 86°F
76°F to 86°F
74°F to 85°F
61°F to 68°F
65°F to 68°F
54°F to 74°F
50°F to 74°F
58°F to 77°F
65°F to 77°F
63°F to 79°F
61°F to 77°F
58°F to 77°F
58°F to 77°F
Map: other cities in South Korea in september
Cities near Koesan:
| Cheongju in september | good weather |
| Anseong in september | good weather |
| Sangju in september | good weather |
| Cheonan in september | good weather |
| Icheon-si in september | good weather |
| Wonju in september | good weather |
| Daejeon in september | good weather |
| Asan in september | good weather |
| Gongju in september | good weather |
| Osan in september | perfect weather |
| Yangp'yong in september | good weather |
| Andong in september | good weather |
Click over cities on the map for information about the weather in september.
Koesan
perfect weather
good
tolerable
bad
very bad
Weather data for Koesan in september:
Weather data for Koesan for september are derived from an average of the weather forecast since 2009 in Koesan. There is a margin of error and these forecasts are to be considered as general information only. The weather in Koesan can vary slightly from year to year, but this data should limit surprises. So you can pack your bags or check for the best time in year to go to Koesan.