Sydney set to record longest stretch of sunny days in May in 154 years of data being kept Eight year olds Lauren Sibbald and Sienna Nelson enjoy playing with the Autumn leaves in Annandale. IT'S been a near-record Indian summer. Today's Sydney forecast of 20C will take our tally to 18 days in a row of 20C-plus temperatures - the second most sunny days in May in 154 years of data being kept. The 19-day record set in 1947 appears safe, with a top temperature of just 19C forecast for Sunday. While thermometers are likely to tip 20C again early next week - after a weekend of clear blue skies - there is a chance of Sunday afternoon snow in the alpine resorts of Thredbo and Perisher. Winter is certainly on the way but not before a glorious end to autumn. "There hasn't been a maximum below 20C in the past month - which is above average - with the average for the month so far being 22.1C," a Bureau of Meteorology spokesman said. There have only been four occasions when the first 16 days of May have had a maximum of 20C or above for Sydney over the 154 years of records. The last time was 1987, and 1965 and 1918 before that.