Hi Shibo, there are 2 types of adhesive, rapid set and normal, if I thought rain was imminent I'd probably use rapid set, normal takes about 5 hours to dry. As for grout, I'd stick to wide join grout, there's a grout available that is used in swimming pools, but most grouts are suitable for both indoor and outdoor use (it'll say on the pack). There's a brand called Bal that does different colour grouts, but it's also super expensive! I probably wouldn't grout a wall if I thought it would rain soon after. It only needs an hour or 2 to dry. Having said that, I've been caught out by a few showers, and nothing happened.
Hope that helps and thanks again to everyone who commented x
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