Weather is only one factor, but it can really affect your travel plans, especially if you are planning a longer stay in Nauvoo. The hottest months are usually July and August, with an average temperature of 25°C, while the coldest months are January and February, with an average of 8°C. The rainiest months in Nauvoo are March, April, February and December, with each month seeing an average of 179 mm of rainfall.