Climate averages 1991–2020
Trier weather
in September.
A mild, moderately wet month: the 4th warmest and the 2nd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Trier: daytime highs average 19.1°C and nights cool to about 10.9°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 67 mm of rain on roughly 10 days, which makes September a moderately wet month (the 2nd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 40 min on an average September day.
The nearest other city in this atlas is Luxembourg (40 km away). In September its highs average 18.6°C, 0.5°C cooler than Trier, with 60 mm of rain.
Among the 120 cities listed in Germany, Trier ranks joint 34th of 120 for the warmest September highs and joint 79th of 120 for the driest September (rainfall, lowest first). The mean September high of those 120 cities is 18.8°C; Trier is 0.3°C warmer than that mean.
From September to October, average highs fall by 4.9°C to 14.2°C, and monthly rainfall rises from 67 mm to 73 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
Trier climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 4.8°C0.0°C | 0.0°C | 82 | 13.1 | 8.69 h |
| February | 6.2°C0.0°C | 0.0°C | 68 | 11.3 | 10.110 h |
| March | 10.1°C2.0°C | 2.0°C | 70 | 12.7 | 11.912 h |
| April | 14.3°C4.8°C | 4.8°C | 57 | 11.6 | 13.714 h |
| May | 18.0°C9.0°C | 9.0°C | 73 | 12.9 | 15.415 h |
| June | 21.2°C12.1°C | 12.1°C | 72 | 11.9 | 16.216 h |
| July | 23.4°C14.3°C | 14.3°C | 71 | 12.3 | 15.916 h |
| August | 23.3°C14.1°C | 14.1°C | 70 | 11.2 | 14.514 h |
| September, selected | 19.1°C10.9°C | 10.9°C | 67 | 10.4 | 12.713 h |
| October | 14.2°C7.6°C | 7.6°C | 73 | 11.8 | 10.811 h |
| November | 8.8°C3.8°C | 3.8°C | 77 | 13.0 | 9.19 h |
| December | 5.4°C1.0°C | 1.0°C | 99 | 14.4 | 8.28 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
- Luxembourg in SeptemberLuxembourg · 40 kmHigh 18.6°C · Low 10.5°C · 60 mm rain
- Saarbrücken in SeptemberGermany · 64 kmHigh 19.5°C · Low 11.4°C · 64 mm rain
- Metz in SeptemberFrance · 78 kmHigh 19.7°C · Low 11.4°C · 68 mm rain
- Kaiserslautern in SeptemberGermany · 89 kmHigh 19.4°C · Low 11.7°C · 60 mm rain
- Koblenz in SeptemberGermany · 94 kmHigh 19.4°C · Low 11.4°C · 55 mm rain
- Bonn in SeptemberGermany · 114 kmHigh 19.3°C · Low 11.5°C · 62 mm rain
- Düren in SeptemberGermany · 117 kmHigh 18.7°C · Low 11.1°C · 61 mm rain
- Aachen in SeptemberGermany · 120 kmHigh 18.4°C · Low 11.2°C · 66 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 Trier) is explained once on the Trier year overview and on the Sources, method and limits page.