How long to BBQ sirloin steak (porterhouse (au))? Grill for 4-5 min/side at 230-260°C (450-500°F). Complete temperature guide in °C and °F with step-by-step instructions.
By Bill Ohaire | Published: April 2026 | Last Updated: April 2026
Photo by Mohamed Olwy on Pexels
BBQ Porterhouse (AU) for 4-5 min/side over direct heat at 230-260°C (450-500°F). Internal temp: 60-63°C (140-145°F). Rest for 5-8 min.
Here is everything you need to know about cooking sirloin steak (porterhouse (au)) on the BBQ. We cover direct grilling, indirect heat, and smoking times with temperatures in Celsius (and Fahrenheit) so you get perfect results every time.
| Method | Temperature | Time |
|---|---|---|
| Direct Grilling | 230-260°C (450-500°F) | 4-5 min/side |
| Indirect Heat | 230-260°C (450-500°F) | 12-15 min total |
Thickness: 2.5cm (1 inch) | Rest time: 5-8 min
Use a calibrated digital meat thermometer for accuracy. Insert the probe into the thickest part of the meat, away from bone or fat pockets, which can give false readings.
| Doneness | Internal Temperature |
|---|---|
| Rare | 49-51°C (120-125°F) |
| Medium-Rare | 54-57°C (130-135°F) |
| Medium | 60-63°C (140-145°F) |
| Medium-Well | 65-68°C (150-155°F) |
| Well Done | 71°C+ (160°F+) |
Whole muscle cuts of beef are safe at 63°C (145°F) with a 3-minute rest, according to food safety authorities. Use a calibrated meat thermometer in the thickest part, away from bone.
A leaner cut than ribeye. Benefits from a light oil coating. Great value steak for BBQ.
Temperature accuracy matters more than timing. Factors like wind, ambient temperature, grill type, and meat thickness all affect cook times. Always verify doneness with a thermometer rather than relying solely on the clock. — AmazingRibs.com
See how porterhouse (au) compares to other popular beef cuts on the BBQ:
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Open CalculatorHow long do you BBQ sirloin steak?
Grill sirloin steak for 4-5 min/side over direct heat at 230-260°C (450-500°F). Always use a meat thermometer to check the internal temperature reaches 60-63°C (140-145°F).
What temperature should sirloin steak be when cooked?
The safe internal temperature for sirloin steak is 60-63°C (140-145°F). Use a digital meat thermometer inserted into the thickest part of the meat, away from any bone.
How long should sirloin steak rest after BBQ?
Rest sirloin steak for 5-8 min after removing from the BBQ. This allows the juices to redistribute throughout the meat, resulting in a juicier, more flavourful result. The internal temperature will continue to rise 2-3°C during this time.
Should I cook sirloin steak on high or low heat?
Cook sirloin steak over high direct heat (230-260°C (450-500°F)) for the best sear and flavour.