Climate averages 1991–2020
Hyesan weather
in September.
A mild, moderately wet month: the 4th warmest and the 8th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Hyesan: daytime highs average 19.7°C and nights cool to about 8.8°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 70 mm of rain on roughly 8 days, which makes September a moderately wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 31 min on an average September day.
The nearest other city in this atlas is Changam-ch’on (102 km away). In September its highs average 22.5°C, 2.8°C warmer than Hyesan, with 103 mm of rain.
Among the 38 cities listed in North Korea, Hyesan ranks 38th of 38 for the warmest September highs and 1st of 38 for the driest September (rainfall, lowest first). The mean September high of those 38 cities is 23.2°C; Hyesan is 3.5°C cooler than that mean.
From September to October, average highs fall by 7.6°C to 12.1°C, and monthly rainfall falls from 70 mm to 43 mm.
The annual picture
September in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Hyesan climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -8.0°C-20.9°C | -20.9°C | 10 | 3.1 | 9.610 h |
| February | -4.2°C-17.6°C | -17.6°C | 18 | 4.6 | 10.611 h |
| March | 2.3°C-9.2°C | -9.2°C | 33 | 7.9 | 11.912 h |
| April | 11.0°C-0.4°C | -0.4°C | 56 | 10.5 | 13.313 h |
| May | 18.0°C5.5°C | 5.5°C | 95 | 14.9 | 14.514 h |
| June | 22.3°C11.2°C | 11.2°C | 97 | 15.5 | 15.115 h |
| July | 24.9°C15.4°C | 15.4°C | 164 | 17.3 | 14.815 h |
| August | 24.4°C15.1°C | 15.1°C | 136 | 14.2 | 13.814 h |
| September, selected | 19.7°C8.8°C | 8.8°C | 70 | 7.9 | 12.513 h |
| October | 12.1°C1.3°C | 1.3°C | 43 | 7.6 | 11.111 h |
| November | 2.5°C-7.5°C | -7.5°C | 38 | 7.7 | 9.910 h |
| December | -6.0°C-18.0°C | -18.0°C | 18 | 5.2 | 9.29 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Changam-ch’on in SeptemberNorth Korea · 102 kmHigh 22.5°C · Low 13.9°C · 103 mm rain
- Hwasŏng in SeptemberNorth Korea · 111 kmHigh 21.6°C · Low 13.5°C · 109 mm rain
- Myŏnggan-dong in SeptemberNorth Korea · 114 kmHigh 21.2°C · Low 13.4°C · 109 mm rain
- Ŏrang in SeptemberNorth Korea · 123 kmHigh 21.1°C · Low 14.8°C · 106 mm rain
- Chongjin in SeptemberNorth Korea · 140 kmHigh 20.4°C · Low 14.6°C · 121 mm rain
- Kanggye in SeptemberNorth Korea · 142 kmHigh 21.9°C · Low 11.5°C · 95 mm rain
- Helong in SeptemberChina · 144 kmHigh 20.9°C · Low 10.2°C · 75 mm rain
- Sinp’o in SeptemberNorth Korea · 151 kmHigh 21.2°C · Low 16.4°C · 101 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Hyesan) is explained once on the Hyesan year overview and on the Sources, method and limits page.