Is it too dry to mulch now?

My soil is dry and sandy and really needs a mulch to improve the soil quality. Had been intending to do so this spring but what with lockdown and working with kids not got round to it! Our soil is now really dry and no rain forecast for weeks. Heard we’re not supposed to mulch in the summer as too dry-does that apply to now? If so, could I water before and after instead? Or should I just wait for a wet spell? Thanks!
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.