Chungcheongnam-do weather in September
September is one of the best months to visit Chungcheongnam-do: highs of 24°C (76°F) and about 134 mm (5.3 in) of rain on average. Nights average 17°C (63°F) and cloud cover 65% (NASA POWER, 2001–2025 averages). It is the 3rd wettest month of the year and the 4th warmest. Compared with August, it is cooler and drier; October brings highs of 19°C (65°F) and 51 mm (2.0 in) of rain.
Figures are long-term averages for Cheonan, the largest city in Chungcheongnam-do. See below for other places.
Is September a good time to visit Chungcheongnam-do?
best month Weather score 65/100.
Yes. September is one of the best months for weather in Chungcheongnam-do.
Does it rain a lot in Chungcheongnam-do in September?
Some rain is normal: about 134 mm (5.3 in) falls in an average September. It is the 3rd wettest month of the year.
How warm is Chungcheongnam-do in September?
Days average 24°C (76°F) and nights 17°C (63°F).
Chungcheongnam-do weather by month
| Month | High | Low | Rain | Cloud | Weather |
|---|---|---|---|---|---|
| January | 2°C (35°F) | -5°C (23°F) | 22 mm | 56% | least pleasant |
| February | 4°C (38°F) | -4°C (26°F) | 32 mm | 55% | least pleasant |
| March | 9°C (48°F) | 0°C (31°F) | 39 mm | 53% | fair |
| April | 15°C (59°F) | 5°C (41°F) | 77 mm | 56% | fair |
| May | 21°C (70°F) | 11°C (51°F) | 84 mm | 58% | best |
| June | 25°C (78°F) | 16°C (61°F) | 125 mm | 70% | best |
| July | 27°C (81°F) | 21°C (70°F) | 343 mm | 78% | least pleasant |
| August | 28°C (83°F) | 22°C (71°F) | 253 mm | 71% | least pleasant |
| September | 24°C (76°F) | 17°C (63°F) | 134 mm | 65% | best |
| October | 19°C (65°F) | 11°C (51°F) | 51 mm | 50% | best |
| November | 11°C (52°F) | 4°C (39°F) | 46 mm | 53% | fair |
| December | 4°C (39°F) | -2°C (28°F) | 26 mm | 54% | least pleasant |
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis). Page updated . How we rate months
Weather across Chungcheongnam-do in September
Weather can differ a lot within Chungcheongnam-do: coasts, hills and mountains each have their own climate.
| Place | High | Low | Rain | Weather |
|---|---|---|---|---|
| Cheonan | 24°C (76°F) | 17°C (63°F) | 134 mm | best |
| Asan | 24°C (76°F) | 17°C (63°F) | 134 mm | best |
| Boryeong | 25°C (76°F) | 16°C (61°F) | 134 mm | best |
| Hongseong | 25°C (76°F) | 16°C (61°F) | 134 mm | best |
| Seosan | 24°C (74°F) | 20°C (67°F) | 134 mm | best |
| Gongju | 25°C (76°F) | 16°C (61°F) | 134 mm | best |
| Buyeo | 25°C (76°F) | 16°C (61°F) | 134 mm | best |
| Nonsan | 25°C (78°F) | 17°C (62°F) | 134 mm | fair |
| Yesan | 25°C (76°F) | 16°C (61°F) | 134 mm | best |
| Tangjin | 24°C (76°F) | 17°C (63°F) | 134 mm | best |
| Seonghwan | 24°C (76°F) | 17°C (63°F) | 134 mm | best |
| Kinzan | 24°C (74°F) | 14°C (58°F) | 136 mm | best |