Climate averages 1991–2020
Mainz weather
in May.
A mild, moderately wet month: the 5th warmest and the joint 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a mild month in Mainz: daytime highs average 18.8°C and nights cool to about 9.4°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 62 mm of rain on roughly 11 days, which makes May a moderately wet month (the joint 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 15 h 23 min on an average May day.
The nearest other city in this atlas is Wiesbaden (12 km away). In May its highs average 18.7°C, about as warm as Mainz, with 62 mm of rain.
Among the 120 cities listed in Germany, Mainz ranks joint 10th of 120 for the warmest May highs and joint 42nd of 120 for the driest May (rainfall, lowest first). The mean May high of those 120 cities is 17.9°C; Mainz is 0.9°C warmer than that mean.
From May to June, average highs rise by 3.5°C to 22.3°C, and monthly rainfall falls from 62 mm to 60 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
Mainz climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 4.4°C-0.6°C | -0.6°C | 49 | 11.0 | 8.69 h |
| February | 6.1°C-0.5°C | -0.5°C | 43 | 9.2 | 10.010 h |
| March | 10.3°C1.9°C | 1.9°C | 49 | 11.2 | 11.812 h |
| April | 15.0°C5.0°C | 5.0°C | 45 | 9.8 | 13.714 h |
| May, selected | 18.8°C9.4°C | 9.4°C | 62 | 11.0 | 15.415 h |
| June | 22.3°C12.9°C | 12.9°C | 60 | 10.5 | 16.316 h |
| July | 24.5°C15.1°C | 15.1°C | 64 | 11.6 | 15.916 h |
| August | 24.5°C15.0°C | 15.0°C | 58 | 10.6 | 14.514 h |
| September | 20.0°C11.4°C | 11.4°C | 54 | 9.3 | 12.713 h |
| October | 14.4°C7.3°C | 7.3°C | 55 | 10.8 | 10.811 h |
| November | 8.6°C3.3°C | 3.3°C | 54 | 11.5 | 9.19 h |
| December | 5.0°C0.4°C | 0.4°C | 62 | 12.8 | 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
May in nearby cities
- Wiesbaden in MayGermany · 12 kmHigh 18.7°C · Low 9.8°C · 62 mm rain
- Darmstadt in MayGermany · 29 kmHigh 18.6°C · Low 9.5°C · 75 mm rain
- Frankfurt am Main in MayGermany · 32 kmHigh 18.7°C · Low 9.4°C · 63 mm rain
- Offenbach in MayGermany · 37 kmHigh 18.7°C · Low 9.4°C · 63 mm rain
- Worms in MayGermany · 39 kmHigh 19.1°C · Low 9.6°C · 61 mm rain
- Hanau am Main in MayGermany · 48 kmHigh 18.7°C · Low 9.4°C · 62 mm rain
- Mannheim in MayGermany · 56 kmHigh 19.3°C · Low 9.9°C · 67 mm rain
- Ludwigshafen am Rhein in MayGermany · 57 kmHigh 19.4°C · Low 9.9°C · 67 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 Mainz) is explained once on the Mainz year overview and on the Sources, method and limits page.
Wiesbaden lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.