The best time to go to Ottawa, Minnesota, is during the summer months, from June to August, for warm weather and outdoor activities, or in the autumn, from September to October, for pleasant temperatures and colourful foliage.Summer in Ottawa brings the warmest weather, with average daily temperatures ranging from 20°C to 27°C. This period is ideal for enjoying the Minnesota River, whether you're interested in fishing, canoeing, or simply relaxing by the water. The longer daylight hours also allow for extended exploration of the local parks and scenic routes.Autumn offers a beautiful transformation of the landscape as the leaves change colour, creating a picturesque setting. Temperatures are cooler but still very comfortable, typically between 10°C and 20°C, making it pleasant for walking tours or visiting local orchards and farms.