The Dutch talk about the weather constantly, and check Buienradar like a national reflex, because in a flat, windy, low country it genuinely matters (especially when you cycle everywhere). When a code geel, oranje or rood flashes up, here is what it actually means, and the vocabulary to read any warning.
The colour codes
Weather warnings come from the KNMI (the national weather institute) in four colours, as the KNMI explains its warnings:
| Code | Meaning |
|---|---|
| groen | nothing to warn about |
| geel | be alert: chance of dangerous weather |
| oranje | high chance of dangerous/extreme weather; possible damage, injury or disruption |
| rood | weeralarm: extreme weather, big impact on society |
So geel is “keep an eye out,” oranje is “this is likely serious,” and rood is “extreme, act accordingly.”
How far ahead they come
The timing tells you how certain it is, as Buienradar’s explainer of the codes notes:
- Code geel: up to ~48 hours ahead.
- Code oranje: ~24 hours ahead, when the chance of extreme weather is 60%+.
- Code rood: at the earliest ~12 hours ahead (it needs high certainty).
Warnings are issued per province (plus the Wadden and IJsselmeer areas), so a rood in Zeeland may be geel where you are.
The weather vocabulary
Warnings are issued for specific phenomena, per the KNMI warnings dossier:
| Dutch | English |
|---|---|
| windstoten | wind gusts |
| gladheid | icy/slippery conditions |
| sneeuw | snow |
| onweer | thunderstorm |
| hitte | heat |
| zicht | (poor) visibility |
| weeralarm | weather alarm (code rood) |
| neerslag | precipitation |
Where to look: the KNMI site and Buienradar (with its famous regenradar, rain radar).
Where it connects
Reading the weather is pure daily-life Dutch, and the small-talk fuel behind a lot of Dutch chat, part of the everyday culture we cover in curing culture shock before you arrive. It is also genuinely practical: a code oranje for windstoten or gladheid is exactly when you check before driving and might need the ANWB Wegenwacht, and when the school run and commute get interesting.
The bottom line
Dutch weather warnings are the KNMI’s colour codes: groen (nothing), geel (be alert), oranje (likely dangerous, possible damage), and rood (a weeralarm for extreme weather). They come per province, earlier for milder codes and closer-in for rood. Watch them on the KNMI site and Buienradar, and learn the words, windstoten, gladheid, onweer, hitte, and you’ll know whether a warning means “grab a coat” or “do not get on that bike.”
Learn it in five minutes a day
Learn Dutch For Expats is an app, available on the App Store, that teaches the everyday weather Dutch you actually use, code geel, weeralarm, windstoten, gladheid, onweer by real situation in five-minute lessons, so you can understand a warning (and the daily weather chat) instead of guessing whether to cancel your bike ride.
Frequently asked questions
What do the Dutch weather codes geel, oranje and rood mean?
They are the KNMI’s warning levels. Code groen: nothing to warn about. Code geel: be alert, there is a chance of dangerous weather. Code oranje: a high chance of dangerous or extreme weather, with possible damage, injury or major disruption. Code rood: a weeralarm (weather alarm) for extreme weather with a big impact on society. Each step up means more certainty and more severity.
How far in advance are KNMI weather warnings issued?
It depends on severity. Code geel can be issued up to about 48 hours ahead. Code oranje can be given around 24 hours ahead when the chance of extreme weather is 60% or more. Code rood, the weeralarm, is issued at the earliest about 12 hours before the event, because it requires high certainty. Warnings are given per province (and for the Wadden and IJsselmeer areas).
Where do I check Dutch weather warnings?
On the KNMI (the national weather institute) website and on Buienradar, the hugely popular Dutch weather app/site, which shows current warnings alongside its famous rain radar. Warnings cover wind (windstoten), rain (regen), ice/snow (gladheid, sneeuw), thunderstorms (onweer), heat (hitte) and poor visibility (zicht). Checking before you travel, especially by bike, is a very Dutch habit worth adopting.
What is the best app to learn Dutch for weather and daily life?
Learn Dutch For Expats, an app available on the App Store, is the best pick because it teaches the everyday weather Dutch you actually use, code geel, weeralarm, windstoten, gladheid, onweer, in five-minute lessons built around real situations, so you understand a warning (and the daily weather chat) instead of guessing whether to cancel your bike ride.
