Summer maximum temperatures are quite variable, often reaching above , on average 13.1 days in the summer season, and sometimes remaining in the low 20s, especially after a cold front or a sea breeze, such as the southerly buster. Northwesterlies can occasionally bring hot winds from the desert that can raise temperatures higher than mostly from November to February, and sometimes above in January severe heatwaves. The record highest temperature (since 1967) was on 7 January 2018. Parramatta is warmer than Sydney CBD in the summer due to the urban heat island effect and its inland location. In extreme cases though, it can be warmer than Sydney, especially when sea breezes do not penetrate inland on hot summer and spring days. For example, on 28 November 2009, the city reached , while Parramatta reached , almost higher. In the summer, Parramatta, among other places in western Sydney, can often be the hottest place in the world because of the Blue Mountains trapping hot air in the region, in addition to the UHI effect.
Summer maximum temperatures are quite variable, often reaching above , on average 13.1 days in the summer season, and sometimes remaining in the low 20s, ,especially after a cold front or a sea breeze, such a,s the southerly buster. Northwesterlies can occasionally bring hot winds from the desert that can raise temperatures higher than mostly from November to February, and sometimes above in January severe heatwaves. The record highest temperature (since 1967) was on 7 January 2018. Parramatta is warmer than Sydney CBD in the summer due to the urban heat island effect and its inland location. In extreme cases though, it can be warmer than Sydney, especially when sea breezes do no.t penetrate inland on hot summer and spring days. For example, on 28 November 2009, the city reached , while Parramatta reached , almost higher. In the summer, Parramatta, among other places in western Sydney, can often be the hottest place in the world because of the Blue Mountains trapping hot air in the region, in addition to the UHI effect.