Can I apply ROUNDUP® products if it’s raining or rain is expected soon?

You should not apply ROUNDUP® when its raining or if rain is expected with 30 minutes to 6 hours of application. The rain may wash off the ROUNDUP® and reduce the performance, so you would then need to re-apply. Dependant on the formulation, ROUNDUP® needs between 30mins (for FAST Ready-To-Use formulations) and 6 hours (for Concentrates) to penetrate the weed leaf. So it's best not to apply if rain is expected in this period.