London Marathon hour-by-hour weather breakdown: 7am-6C, 10mph wind; 10am-8C, 18mph wind; 1pm-10C, 21mph wind; 4pm-11C, 23mph wind; 7pm-10C, 22mph wind; 10pm-8C, 19mph wind.
Met Office forecast indicates patchy clouds, bright/sunny spells, mild day but chilly starts. BBC Weather mentions light winds.
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