Buienradar and Buienalarm give different forecasts because they use separate weather models and update frequencies. Buienradar relies on the KNMI (Dutch national weather service) model with hourly updates, while Buienalarm uses a higher-resolution commercial model that updates every 15 minutes, prioritizing short-term precipitation and wind details. This explains why Buienalarm often shows stronger winds and slightly different temperatures, especially for the next few hours.
For your specific needs, Buienalarm is generally more accurate for wind speed, as its model is designed to capture gusty conditions that affect cycling with a bakfiets. Temperature differences of 6-7 degrees are unusual but can happen when one model predicts a sea breeze or cloud cover that the other misses. In practice, Buienalarm tends to be more reliable for the next 6 hours, while Buienradar is better for a broader daily overview. Neither is always right, but you can cross-check both: if Buienalarm shows BFT 6+ and Buienradar shows BFT 3, the truth is likely closer to Buienalarm for wind, but temperature often lands between the two.
To decide which to trust, check the actual conditions against the forecast for a few days. For wind, note that Buienalarm's higher resolution picks up local effects like the Hague's coastal gusts. For temperature, look at the KNMI's official hourly observations at your nearest station (like Valkenburg or Hoek van Holland) and compare. Both apps are free, so use Buienalarm for immediate decisions (like school runs) and Buienradar for planning the day. If you want to improve your Dutch while checking weather, try setting Buienradar to Dutch and reading the terms like "onweer" (thunderstorm) and "wolkbreuk" (cloudburst).