Climate averages 1991–2020
Aachen weather
in May.
A mild, moderately wet month: the 5th warmest and the joint 3rd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a mild month in Aachen: daytime highs average 17.2°C and nights cool to about 8.8°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 66 mm of rain on roughly 13 days, which makes May a moderately wet month (the joint 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 15 h 29 min on an average May day.
The nearest other city in this atlas is Heerlen (14 km away). In May its highs average 17.6°C, about as warm as Aachen, with 52 mm of rain.
Among the 120 cities listed in Germany, Aachen ranks 103rd of 120 for the warmest May highs and joint 68th of 120 for the driest May (rainfall, lowest first). The mean May high of those 120 cities is 17.9°C; Aachen is 0.7°C cooler than that mean.
From May to June, average highs rise by 2.9°C to 20.1°C, and monthly rainfall rises from 66 mm to 76 mm.
The annual picture
May 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
Aachen climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 4.9°C0.4°C | 0.4°C | 74 | 13.8 | 8.59 h |
| February | 6.0°C0.4°C | 0.4°C | 68 | 12.6 | 10.010 h |
| March | 9.5°C2.3°C | 2.3°C | 70 | 13.7 | 11.812 h |
| April | 13.5°C4.9°C | 4.9°C | 55 | 11.6 | 13.814 h |
| May, selected | 17.2°C8.8°C | 8.8°C | 66 | 12.9 | 15.515 h |
| June | 20.1°C11.8°C | 11.8°C | 76 | 13.1 | 16.416 h |
| July | 22.1°C14.1°C | 14.1°C | 83 | 13.7 | 16.016 h |
| August | 22.0°C14.0°C | 14.0°C | 79 | 12.9 | 14.515 h |
| September | 18.4°C11.2°C | 11.2°C | 66 | 10.9 | 12.713 h |
| October | 13.9°C8.1°C | 8.1°C | 65 | 11.8 | 10.811 h |
| November | 8.9°C4.3°C | 4.3°C | 69 | 13.1 | 9.09 h |
| December | 5.6°C1.5°C | 1.5°C | 85 | 14.5 | 8.18 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
May in nearby cities
- Heerlen in MayThe Netherlands · 14 kmHigh 17.6°C · Low 9.0°C · 52 mm rain
- Maastricht in MayThe Netherlands · 29 kmHigh 17.9°C · Low 9.2°C · 64 mm rain
- Düren in MayGermany · 29 kmHigh 17.5°C · Low 8.7°C · 64 mm rain
- Liège in MayBelgium · 40 kmHigh 17.8°C · Low 9.3°C · 63 mm rain
- Mönchengladbach in MayGermany · 52 kmHigh 18.1°C · Low 9.4°C · 62 mm rain
- Hasselt in MayBelgium · 55 kmHigh 18.0°C · Low 9.2°C · 60 mm rain
- Viersen in MayGermany · 57 kmHigh 18.1°C · Low 9.5°C · 62 mm rain
- Neuss in MayGermany · 63 kmHigh 18.2°C · Low 9.4°C · 64 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 Aachen) is explained once on the Aachen year overview and on the Sources, method and limits page.