Climate averages 1991–2020
Longnan weather
in September.
A warm, wet month: the 5th warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
Approximate: the model cell is 649 m higher than the city, so the temperatures are adjusted up by 4.2°C. For places not marked Approximate, the cell is within 400 m of the place's elevation.
September is a warm month in Longnan: daytime highs average 23.0°C and nights cool to about 17.0°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 128 mm of rain on roughly 17 days, which makes September a wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 25 min on an average September day.
The nearest other city in this atlas is Pingwu County (116 km away). In September its highs average 22.5°C, 0.5°C cooler than Longnan, with 204 mm of rain.
Among the 884 cities listed in China, Longnan ranks joint 700th of 884 for the warmest September highs and joint 690th of 884 for the driest September (rainfall, lowest first). The mean September high of those 884 cities is 25.7°C; Longnan is 2.7°C cooler than that mean.
From September to October, average highs fall by 5.1°C to 17.9°C, and monthly rainfall falls from 128 mm to 90 mm.
The annual picture
September in context
Monthly rainfall
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
Longnan climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 4.8°C-3.5°C | -3.5°C | 14 | 4.7 | 10.210 h |
| February | 7.6°C-0.7°C | -0.7°C | 20 | 6.1 | 11.011 h |
| March | 13.9°C5.2°C | 5.2°C | 39 | 10.6 | 12.012 h |
| April | 19.8°C10.7°C | 10.7°C | 62 | 12.0 | 13.013 h |
| May | 23.5°C15.2°C | 15.2°C | 94 | 15.0 | 13.914 h |
| June | 26.6°C19.0°C | 19.0°C | 108 | 14.9 | 14.314 h |
| July | 28.3°C21.3°C | 21.3°C | 152 | 16.8 | 14.114 h |
| August | 27.5°C20.6°C | 20.6°C | 131 | 16.6 | 13.413 h |
| September, selected | 23.0°C17.0°C | 17.0°C | 128 | 16.6 | 12.412 h |
| October | 17.9°C11.6°C | 11.6°C | 90 | 15.4 | 11.411 h |
| November | 12.4°C5.2°C | 5.2°C | 31 | 7.7 | 10.510 h |
| December | 6.6°C-1.2°C | -1.2°C | 11 | 3.6 | 10.010 h |
Rainfall is the average of the 30 separate monthly totals. A rain 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
- Pingwu County in SeptemberChina · 116 kmHigh 22.5°C · Low 17.5°C · 204 mm rain
- Guangyuan in SeptemberChina · 136 kmHigh 24.2°C · Low 17.7°C · 193 mm rain
- Luomen in SeptemberChina · 151 kmHigh 21.2°C · Low 12.7°C · 94 mm rain
- Tianshui in SeptemberChina · 152 kmHigh 21.9°C · Low 13.9°C · 116 mm rain
- Pan’an in SeptemberChina · 152 kmHigh 21.3°C · Low 12.9°C · 94 mm rain
- Gangu Chengguanzhen in SeptemberChina · 153 kmHigh 21.9°C · Low 13.5°C · 95 mm rain
- Xinxing in SeptemberChina · 158 kmHigh 21.5°C · Low 13.2°C · 95 mm rain
- Beidao in SeptemberChina · 158 kmHigh 21.9°C · Low 14.0°C · 115 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 Longnan) is explained once on the Longnan year overview and on the Sources, method and limits page.