# Seasonal weather transition in Netherlands and Belgium

> Live situation record from CLSTR: https://clstr.news/situations/seasonal-weather-transition-in-netherlands-and-belgium
> Updated: 2026-09-12T07:15:00.000Z. Sources: 16. Developments: 3.

Weather forecasts for the Netherlands and Belgium indicate a transition from summer-like conditions toward a wetter seasonal pattern. Meteorologist Frank Deboosere has noted that summer heat has largely concluded, predicting a notably wet period in the coming months. This trend is attributed to the North Sea’s relatively warm water temperature of approximately 20 degrees Celsius; when cold air moves over this water, the atmospheric contrast can trigger intense showers and thunderstorms, particularly in coastal areas.

While temperatures exceeding 30 degrees Celsius are unlikely to return, stable conditions with temperatures in the low 20s may still occur. In Belgium, a transition through a rain zone is expected, followed by more stable conditions with temperatures around 20 to 22 degrees Celsius. In the Netherlands, a shift from sunny weather to a rainy and windy Sunday has been forecast, with temperatures between 19 and 21 degrees. 

Following this period of unsettled weather, temperatures in the Netherlands are projected to rise temporarily, potentially reaching 25 degrees in areas such as Apeldoorn, before decreasing again later in the week due to unsettled weather and daily chances of rain. Long-term outlooks continue to suggest increased precipitation for November and December.

## Timeline

### 2026-09-12: Weather forecast for the Netherlands: rain expected Sunday

The Netherlands will experience a shift from sunny Saturday weather to rainy, windy conditions on Sunday, followed by a brief warm spell on Monday and Tuesday before temperatures drop again.

7 sources. https://clstr.news/cluster/weather-forecast-for-the-netherlands-rain-expected-sunday

### 2026-09-08: Weather forecast predicts wet transition as summer heat fades

Meteorologist Frank Deboosere predicts a wet transition into autumn, warning of heavy coastal showers caused by warm North Sea waters despite the possibility of mild October days.

3 sources. https://clstr.news/cluster/weather-forecast-predicts-wet-transition-as-summer-heat-fades

### 2026-08-29: Weather forecast: Cooler weekend and wetter seasonal outlook

Unsettled and cooler weather is forecast for the weekend in the Netherlands, while seasonal models suggest a wetter end to the year due to high North Sea temperatures.

9 sources. https://clstr.news/cluster/weather-forecast-cooler-weekend-and-wetter-seasonal-outlook

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Cite as: Seasonal weather transition in Netherlands and Belgium. CLSTR, https://clstr.news/situations/seasonal-weather-transition-in-netherlands-and-belgium