Climate averages 1991–2020
Heerlen weather
in May.
A mild, moderately wet month: the 5th warmest and the 2nd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a mild month in Heerlen: daytime highs average 17.6°C and nights cool to about 9.0°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 52 mm of rain on roughly 11 days, which makes May a moderately wet month (the 2nd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 15 h 30 min on an average May day.
The nearest other city in this atlas is Aachen (14 km away). In May its highs average 17.2°C, about as warm as Heerlen, with 66 mm of rain.
Among the 44 cities listed in the Netherlands, Heerlen ranks joint 14th of 44 for the warmest May highs and 2nd of 44 for the driest May (rainfall, lowest first). The mean May high of those 44 cities is 16.9°C; Heerlen is 0.7°C warmer than that mean.
From May to June, average highs rise by 2.9°C to 20.5°C, and monthly rainfall rises from 52 mm to 63 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
Heerlen climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 5.3°C0.6°C | 0.6°C | 63 | 12.5 | 8.58 h |
| February | 6.4°C0.7°C | 0.7°C | 57 | 11.4 | 10.010 h |
| March | 9.9°C2.5°C | 2.5°C | 56 | 12.4 | 11.812 h |
| April | 13.9°C5.1°C | 5.1°C | 44 | 10.2 | 13.814 h |
| May, selected | 17.6°C9.0°C | 9.0°C | 52 | 11.4 | 15.515 h |
| June | 20.5°C12.1°C | 12.1°C | 63 | 11.6 | 16.416 h |
| July | 22.5°C14.3°C | 14.3°C | 70 | 12.5 | 16.016 h |
| August | 22.4°C14.2°C | 14.2°C | 67 | 11.2 | 14.615 h |
| September | 18.8°C11.4°C | 11.4°C | 57 | 10.1 | 12.713 h |
| October | 14.3°C8.3°C | 8.3°C | 59 | 11.0 | 10.811 h |
| November | 9.2°C4.5°C | 4.5°C | 61 | 12.4 | 9.09 h |
| December | 5.9°C1.7°C | 1.7°C | 72 | 13.7 | 8.08 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
- Aachen in MayGermany · 14 kmHigh 17.2°C · Low 8.8°C · 66 mm rain
- Maastricht in MayThe Netherlands · 21 kmHigh 17.9°C · Low 9.2°C · 64 mm rain
- Düren in MayGermany · 37 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
- Hasselt in MayBelgium · 45 kmHigh 18.0°C · Low 9.2°C · 60 mm rain
- Mönchengladbach in MayGermany · 46 kmHigh 18.1°C · Low 9.4°C · 62 mm rain
- Viersen in MayGermany · 50 kmHigh 18.1°C · Low 9.5°C · 62 mm rain
- Venlo in MayThe Netherlands · 56 kmHigh 18.2°C · Low 9.4°C · 61 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 Heerlen) is explained once on the Heerlen year overview and on the Sources, method and limits page.