Climate averages 1991–2020
Rotterdam weather
in August.
A mild, moderately wet month: the 2nd warmest and one of the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a mild month in Rotterdam: daytime highs average 21.6°C and nights cool to about 14.4°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 79 mm of rain on roughly 13 days, which makes August a moderately wet month (one of the wettest months of the year). Daylight, from sunrise to sunset, lasts about 14 h 39 min on an average August day.
The nearest other city in this atlas is Schiedam (6 km away). In August its highs average 21.5°C, about as warm as Rotterdam, with 79 mm of rain.
Among the 44 cities listed in the Netherlands, Rotterdam ranks joint 20th of 44 for the warmest August highs and joint 16th of 44 for the driest August (rainfall, lowest first). The mean August high of those 44 cities is 21.5°C; Rotterdam is 0.1°C warmer than that mean.
From August to September, average highs fall by 3.1°C to 18.5°C, and monthly rainfall falls from 79 mm to 69 mm.
The annual picture
August 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
Rotterdam climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 5.9°C1.6°C | 1.6°C | 62 | 12.2 | 8.38 h |
| February | 6.8°C1.5°C | 1.5°C | 52 | 10.9 | 9.910 h |
| March | 9.8°C3.2°C | 3.2°C | 53 | 11.3 | 11.812 h |
| April | 13.6°C5.6°C | 5.6°C | 48 | 10.9 | 13.914 h |
| May | 17.0°C9.2°C | 9.2°C | 61 | 11.5 | 15.616 h |
| June | 19.6°C12.1°C | 12.1°C | 64 | 11.0 | 16.617 h |
| July | 21.7°C14.4°C | 14.4°C | 79 | 13.4 | 16.216 h |
| August, selected | 21.6°C14.4°C | 14.4°C | 79 | 13.0 | 14.715 h |
| September | 18.5°C12.0°C | 12.0°C | 69 | 12.1 | 12.713 h |
| October | 14.3°C8.7°C | 8.7°C | 68 | 12.6 | 10.711 h |
| November | 9.7°C5.2°C | 5.2°C | 66 | 13.5 | 8.99 h |
| December | 6.4°C2.4°C | 2.4°C | 71 | 13.5 | 7.98 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
August in nearby cities
- Schiedam in AugustThe Netherlands · 6 kmHigh 21.5°C · Low 14.7°C · 79 mm rain
- Vlaardingen in AugustThe Netherlands · 9 kmHigh 21.4°C · Low 14.8°C · 79 mm rain
- Delft in AugustThe Netherlands · 13 kmHigh 21.2°C · Low 14.8°C · 79 mm rain
- Spijkenisse in AugustThe Netherlands · 13 kmHigh 21.6°C · Low 14.5°C · 76 mm rain
- Zoetermeer in AugustThe Netherlands · 15 kmHigh 21.2°C · Low 14.7°C · 79 mm rain
- Dordrecht in AugustThe Netherlands · 18 kmHigh 21.9°C · Low 14.3°C · 76 mm rain
- Gouda in AugustThe Netherlands · 19 kmHigh 21.5°C · Low 14.4°C · 82 mm rain
- The Hague in AugustThe Netherlands · 21 kmHigh 20.7°C · Low 15.2°C · 79 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 Rotterdam) is explained once on the Rotterdam year overview and on the Sources, method and limits page.
Zoetermeer and Schiedam lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.