Rail and hail could arrive for the second day of the London 2012 Olympics. Photo: Tony Marshall/PA Wire

Day two of the Olympics could be hit by the return of wet weather.

Forecasters say there will be heavy showers across central and east London, with hailstones also a possibility.

The change in weather follows the wettest April and June on record and a rainy start to July, although the past few days have seen sunshine and high temperatures.

Sports fans visiting the Olympic Park in Stratford can expect a dry and sunny start to the day, before the clouds start to build up, forecasters said.

Paul Mott, senior forecaster with MeteoGroup, the weather division of the Press Association, said: “There will be some showers around in the afternoon, and some of them look like being quite heavy.

“It looks like there could be some thunder and even hailstones. It’s also going to be a fairly cold day compared to recent days, with highs of 20 degrees.

“Although there will be a lot of rain around, we’re not expecting the day to be a washout, and it looks like we’ll see a return to drier conditions on Monday.”

Other Olympic venues are also forecast to be hit by adverse weather, with the Met Office predicting heavy showers at Wimbledon, where the tennis event is taking place, from around 1pm and lasting through the afternoon.

Elsewhere, the archery at Lord’s Cricket Ground will be affected by heavy rain in the afternoon, the Met Office said. Meanwhile the cycling event will experience some lighter rain.