The best time to go to Onslow is during the cooler, drier months from May to September.During this period, you'll experience pleasant daytime temperatures, typically ranging from the low 20s to high 20s Celsius, making it ideal for outdoor activities and exploring the region. The humidity is also much lower compared to the summer months, ensuring a more comfortable stay.This time of year is superb for couples or solo travellers looking to enjoy the natural beauty of the Pilbara coast. You can take advantage of the comfortable weather for fishing charters, exploring the Mackerel Islands, or simply relaxing on the beach without the intense heat. It's also when you're most likely to spot humpback whales migrating along the coast, offering a memorable experience.While the shoulder seasons of April and October can also be pleasant, they can occasionally bring warmer temperatures or a chance of early or late-season rain.