England and Pakistan's staff will be poring over weather charts as well as tactics in the lead-up to the Twenty20 World Cup final, with a gloomy forecast threatening to scupper the decider at the Melbourne Cricket Ground.

Heavy rain is expected on Sunday's match day and also the reserve day on Monday as a multi-year La Nina weather phenomenon continues to drench much of eastern Australia.

The tournament has already seen a slew of Super 12 matches washed out, though the semi-finals passed without disruption in Sydney and Adelaide.

While the forecast could put a dampener on the crowd at the MCG, organisers will plough ahead with the starting time of 7pm (0800 GMT) on Sunday and hope each side can squeeze 10 overs in, the minimum required for the final.

If the match starts on Sunday and is unable to be completed, it will resume at 3pm (0400 GMT) on Monday, leaving players with a nervous night's sleep.

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If Sunday is completely washed out, the match will start at 3pm on Monday, with the teams on notice to be ready to linger well into the evening if the weather forces it.

In the worst-case scenario where Monday is also washed out, then the World Cup will have joint winners for the first time.

However, Melbourne is known for having "four seasons in one day", particularly in spring, and forecasts are often wide of the mark.

Pakistan played a full game against India in their Super 12 blockbuster at the MCG despite a dire outlook for rain.

Rain was expected on Friday, too, but Pakistan trained under leaden skies at the MCG without ever running for cover.

Pakistan team mentor Matthew Hayden, who accurately predicted struggling captain Babar Azam would return to form with the bat in the semi-final against New Zealand, was banking on the weather to cooperate.

"Today there was a great chance of rain and here we are," Hayden told reporters at the MCG.

"The wicket looks excellent ... Who knows the weather here in Melbourne?

"On the day, I'm sure that Melbourne is going to open up enough to have a 10-over match."