Sydney's September is going to finish just how it started; unseasonably warm, with the city to see its warmest on record. Heat lovers will be happy to see the next three days are forecast to reach 28 degrees in the city. If this occurs, this will be the first time this has happened in September since 1987, although there has been a warmer three-day period in September more recently in 2006 when the maximum averaged a toasty 30 degrees. Sydney's west, such as Richmond and Penrith, is forecast to hit at least 31 degrees over the next three days, and if it does so, it will be the first time this has occurred on record in September. This is continuing Sydney's trend of an unseasonably hot September. The city is currently averaging a maximum of 23.5 degrees, and with it forecast to reach at least 22 degrees for the remainder of the month, it will comfortably break the previous record of 23.3 degrees set in 1980. Richmond is averaging 25 degrees for September so far, and with the remainder of the month forecast to reach at least 23 degrees, is likely to see its second warmest on record. The unusually hot September has been caused by a combination of very warm sea surface temperatures, clear skies, and persistent westerly winds. This also follows Sydney's warmest winter on record. Current long-term models suggest the unseasonably hot conditions will continue into October.