I can’t directly access Buienalarm.nl to check for rain alarms in Alphen aan den Rijn, but I can help you find some alternative resources:
Buienradar.nl: https://www.buienradar.nl/weer/alphen-aan-den-rijn/nl/2759875 offers a rain radar for Alphen aan den Rijn. This allows you to see if there’s any rain currently falling and where it’s located.
Weeronline: https://www.weeronline.nl/regenradar/Alphen-aan-den-Rijn/4057840 provides a weather forecast for Alphen aan den Rijn, including the chance of rain for the next few hours.
Weersverwachting Alphen aan den Rijn: https://www.weeronline.nl/regenradar/Alphen-aan-den-Rijn/4057840 (Dutch only) offers a general weather overview for Alphen aan den Rijn, which might mention any upcoming rain showers.
These resources should give you a good idea of whether you need to worry about rain in Alphen aan den Rijn.