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More than 200 people are set to take part in the three different events - a 45km mountain bike race, a 42.2km mountain marathon and the 107km Ultra Easy run.
After the event last year, organiser Terry Davis said he had been pleased to see nobody died in the record 36degC heat.
That should not be an issue this time around, as cooler conditions and blustery showers are expected.
''It will be good for the event because it's much nicer to race in cooler conditions rather than hot conditions. Even though it may be windy with some showers, that will feel a whole lot nicer to people running, and the bikers won't mind not having the heat when biking uphill,'' Mr Davis said yesterday.
Participation numbers were down this year, which Mr Davis said was disappointing.
He believed it was due to the saturation of multisport events in the area at this time of the year.
''It's very difficult to change the date as there are very few alternatives. It is something we're considering but it's not easy.''
The 100-plus competitors in the Ultra Easy began their race at 3am today and are expected to finish mid-afternoon, while the other two races will have staggered finishes throughout the day in Luggate.