When travelling, we recommend packing in preparation to handle common weather conditions. The rainfall in Norwich is typically greater than that of Grand Forks. We can gather that this will continue over the next 21 days.
You can imagine temperatures to be in the 29 °C range in July. The weather in Grand Forks is generally hotter than Norwich's. As flight availability is subject to become more limited as peak season approaches it is ideal to book in a timely manner.