Sydney just endured its hottest month in more than 150 years.

January was exceptionally warm in the capital city during both the days and nights.

The average minimum temperature of 21.56 degrees during January beats the previous record by more than half a degree.

The city's long-standing monthly average maximum temperature record was harder to beat. Today needed to reach at least 35.7 degrees to eclipse the monthly maximum of 29.5 set back in 1896. By 10am, the city had hit 36.6C. No worries.

Combining the minimum and maximum temperatures during this month, Sydney's average January temperature was over 25.5 degrees. This feat is more than three degrees above the long-term average and pushes out the previous record of 24.95 degrees from 1991.

Western Sydney also felt the heat during the month. Richmond registered their hottest January on record in terms of minimum, maximum and average temperatures. Data is available back to 1940 for Richmond.