Clerk of the course Andrew Cooper expects the Epsom ground to remain predominately good despite a heavy shower ahead of this afternoon's Investec Derby.
Six millimetres of rain fell this morning, mainly between 10am to 10.30am. Cooper said:
"It looks like we have had the worst of the forecast rain and we should be getting better, clearer weather from now on."
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The heavy showers will ease off this weekend.
Labour MPs are attempting to build a consensus for a single challenger to Corbyn, while the big game in the Tory Party is Stop Boris.
Hefty showers and longer, slow moving downpours into this evening and again on Saturday - some lively with thunder.