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I'm going to double check that patch dries out outside when not raining, if it's constantly wet then it must be something else, hopefully silicone solves it.
We also have another damp patch on the opposite wall which we think lines up with the neighbours chimney (interior wall), probably not capped properly/at all, as again it always gets worse when it rains.
apc
Silicone as a temporary bodge*.
Longer-term: strip back the render and see what's happening behind it. Cement** render shouldn't be letting water through, even if it's trapped against it, unless it's cracked / breached.
* So good for 10+ years, if you're anything like me...
** if it is cement