Drier conditions are forecast for most of Victoria this week, with the chance of rain from the west increasing from Sunday.

Rain across western Victoria could help lift soil moisture in the region, which is below average in parts for this time of year.

The rainfall outlook for February to April, issued on January 13, shows western Victoria and neighbouring parts of South Australia with reduced chance of above average rainfall.

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Bureau of Meteorology meteorologist Miriam Bradbury said to expect a humid end to January.

"It's a very dynamic situation," she said.

"It's a low pressure trough...at this point it's likely to see some rain next week. Getting into Wednesday and Thursday we could see those rain totals increasing.

"It's one of these systems that is bring a lot of tropical moisture and tropical heat. It'll be warm and humid. It will feel pretty muggy and it's not clearing up with the dry air. It will hang around for a few days."

Most of Western Victoria has a 64 per cent chance of higher than average rainfall from January 22 to January 28.

Meteorologist Miriam Bradbury said to expect a humid end to January.

Following mixed rainfall in December, with very dry conditions in the west contrasting with very wet conditions in the east, streamflows for January to March 2022 are likely to be high at forecast sites along rivers in Victoria's east, tending to near-median or even low streamflows at sites in the west.

Days are likely to be warmer than average this February to April in Victoria's west.

From Stawell to past Warracknabeal, temperatures will have at least a 30 per cent off hitting above the average temperature.

Nights are likely to be warmer than average as well.

The La Nina event in the tropical Pacific is near or at its peak and continues to provide a wet influence to some parts of the country.

Climate models show the El Nino-Southern Oscillation (ENSO) is likely to return to neutral (neither La Nina or El Nino) early in autumn.

The timing is not unusual, with ENSO events typically decaying during autumn.

La Nina events increase the chances of above-average summer rainfall.

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