So what is the weather forecast for Sunday's 38th Great North Run?
While experts are now downplaying earlier sunny predictions, temperatures on a dry and cloudy day are still expected to reach 19 degrees Celsius on the 13.1-mile course.
Temperatures at 10.40am, when the elite men and masses begin running, are likely to be 14 degrees Celsius with a mild breeze blowing in competitors' faces.
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Between noon-1pm, when thousands of the runners hit the sea front at South Shields, temperatures are due to be 19 degrees Celsius with a gentle tail wind helping them tackle the final mile.