When travelling, we recommend packing in preparation to handle common weather conditions. The rainfall in Auckland is typically less than Burlington. We can gather that this will continue over the next 9 days.
United Airlines is one of the carriers that may have flexible change policies. You can use our site to filter for other airlines that may also have this kind of flexibility.
Expect the weather to be around 28 °C on average in July. As the temperature peaks, try to get your plans done early, as flight price and availability will have an impact on your travels. The climate in Burlington is generally hotter than in Auckland.