Climate averages 1991–2020
Alphen aan den Rijn weather
in August.
A mild, wet month: the 2nd warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a mild month in Alphen aan den Rijn: daytime highs average 21.3°C and nights cool to about 14.5°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 90 mm of rain on roughly 13 days, which makes August a wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 14 h 40 min on an average August day.
The nearest other city in this atlas is Leiden (12 km away). In August its highs average 20.8°C, 0.6°C cooler than Alphen aan den Rijn, with 90 mm of rain.
Among the 44 cities listed in the Netherlands, Alphen aan den Rijn ranks 29th of 44 for the warmest August highs and joint 37th of 44 for the driest August (rainfall, lowest first). The mean August high of those 44 cities is 21.5°C; Alphen aan den Rijn is 0.2°C cooler than that mean.
From August to September, average highs fall by 3.0°C to 18.3°C, and monthly rainfall falls from 90 mm to 81 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
Alphen aan den Rijn climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 5.9°C1.7°C | 1.7°C | 69 | 13.3 | 8.38 h |
| February | 6.6°C1.5°C | 1.5°C | 56 | 11.1 | 9.910 h |
| March | 9.6°C3.2°C | 3.2°C | 55 | 11.2 | 11.812 h |
| April | 13.3°C5.6°C | 5.6°C | 49 | 10.7 | 13.914 h |
| May | 16.7°C9.2°C | 9.2°C | 62 | 10.9 | 15.716 h |
| June | 19.3°C12.1°C | 12.1°C | 66 | 11.7 | 16.717 h |
| July | 21.4°C14.4°C | 14.4°C | 83 | 13.4 | 16.216 h |
| August, selected | 21.3°C14.5°C | 14.5°C | 90 | 13.3 | 14.715 h |
| September | 18.3°C12.1°C | 12.1°C | 81 | 12.8 | 12.713 h |
| October | 14.2°C8.8°C | 8.8°C | 84 | 13.7 | 10.711 h |
| November | 9.6°C5.3°C | 5.3°C | 75 | 14.1 | 8.99 h |
| December | 6.4°C2.5°C | 2.5°C | 79 | 14.0 | 7.88 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
- Leiden in AugustThe Netherlands · 12 kmHigh 20.8°C · Low 15.1°C · 90 mm rain
- Gouda in AugustThe Netherlands · 13 kmHigh 21.5°C · Low 14.4°C · 82 mm rain
- Zoetermeer in AugustThe Netherlands · 14 kmHigh 21.2°C · Low 14.7°C · 79 mm rain
- Hoofddorp in AugustThe Netherlands · 19 kmHigh 20.7°C · Low 15.2°C · 90 mm rain
- Amstelveen in AugustThe Netherlands · 24 kmHigh 21.1°C · Low 14.7°C · 90 mm rain
- Delft in AugustThe Netherlands · 25 kmHigh 21.2°C · Low 14.8°C · 79 mm rain
- The Hague in AugustThe Netherlands · 25 kmHigh 20.7°C · Low 15.2°C · 79 mm rain
- Rotterdam in AugustThe Netherlands · 26 kmHigh 21.6°C · Low 14.4°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 Alphen aan den Rijn) is explained once on the Alphen aan den Rijn year overview and on the Sources, method and limits page.
Hoofddorp and Amstelveen lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.