WEATHER · CLIMATE NORMALS · 1991–2020
Hamburg Climate — Averages by Month
What the weather in Hamburg, DEaverages across a standard 30-year period. Each month's figure is the 1991–2020 mean temperature and total rainfall from the ERA5 reanalysis — the long-run normal a place settles around, not a forecast for any particular day.
Month-by-month normals
| Month | Avg temperature | Avg rainfall |
|---|---|---|
| January | 1.8 °C · coldest | 68.4 mm |
| February | 2.2 °C | 56.0 mm |
| March | 4.7 °C | 58.7 mm |
| April | 9.0 °C | 52.7 mm |
| May | 13.0 °C | 69.3 mm |
| June | 16.0 °C | 77.2 mm |
| July | 18.2 °C · warmest | 91.6 mm · wettest |
| August | 17.9 °C | 82.4 mm |
| September | 14.2 °C | 61.6 mm |
| October | 9.8 °C | 61.6 mm |
| November | 5.5 °C | 58.0 mm |
| December | 2.7 °C | 69.2 mm |
How to read these numbers
These are reanalysis normals, not readings from a single weather station. They come from the ERA5 0.25° (~25 km) global reanalysis grid, sampled at the grid cell nearest Hamburg — centred at 53.50°N, 10.00°E. A reanalysis blends observations with a physics model onto an even grid, so a coastal or mountain city's cell can read a little cooler, warmer, wetter or drier than the city centre itself. The month-to-month shape — when it's hot, when it rains — is what these normals capture best.
“Normal” means the 1991–2020 average, the current World Meteorological Organization standard period. A normal is what a place tends toward over decades — any single day, month or year can and will depart from it.