When travelling, we recommend packing in preparation to handle common weather conditions. The rainfall in Grande Prairie is typically similar to Ste. Marie Marie. We can gather that this will continue over the next 15 days.
You can imagine temperatures to be in the 25 °C range in July. The weather in Ste. Marie Marie is generally hotter than Grande Prairie's. As flight availability is subject to become more limited as peak season approaches it is ideal to book in a timely manner.