The Bureau of Meteorology yesterday forecast a maximum temperature of 45 degrees Celsius, slightly higher than tomorrow's 44 degrees.

Bureau website data collected from its weather station at Dubbo airport includes the highest temperature for each month of the year since 1993.

To date the hottest temperature of the past 20 years is 44.5 degrees on February 15, 2004.

The bureau updates its seven-day forecast for communities like Dubbo every 24 hours.

Sunday's predicted maximum jumped five degrees yesterday, from 40 degrees on Wednesday.

The forecast of 44 degrees tomorrow has remained steady throughout this week.

Today's maximum temperature is expected to reach 42 degrees.

The heat will continue into next week with the bureau predicting maximum temperatures of 38, 39 and 40 degrees on Monday, Tuesday and Wednesday respectively.

The discomfort of daytime temperatures will not be ameliorated by forecast minimum temperatures of between 18 and 26 degrees.

Dubbo's run of temperatures above 35 degrees was broken on Wednesday of this week when the maximum temperature only reached 30.9 degrees.

It went for 12 days with one of them cracking 40 degrees.

Last Sunday, January 6, the city experienced 41.2 degrees.

As of yesterday the hottest January day since 1993 was January 15, 2001, when 42.9 degrees was recorded by the bureau.

The average maximum temperature for the month of January in Dubbo is 33.2 degrees and average rainfall 52.4 millimetres.

Yesterday the bureau predicted a "possible morning shower" on Monday.