Bewolking — 2026
| Month | Maassluis | Nissewaard | Difference |
|---|---|---|---|
| Jan | – | – | – |
| Feb | – | – | – |
| Mar | 60.1 % | 56.8 % | +3.3 |
| Apr | 80.7 % | 79.4 % | +1.3 |
| May | 57.1 % | 58.2 % | -1.1 |
| Jun | 59.8 % | 60.6 % | -0.8 |
| Jul | 47.8 % | 46.1 % | +1.7 |
| Aug |
| 53.1 % |
| 53.9 % |
| -0.8 |
| Sep | 73.8 % | 73.5 % | +0.3 |
| Oct | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |