With a population of around 1,400, Walnut sits in Illinois, United States. The city operates in the Central Time Zone.
Recent weather here gives a sense of typical conditions: in 2025, Walnut recorded a mean annual temperature of 52°F, ranging from -11°F lows in January to 96°F highs in June, with about 32 inches of precipitation across the year.
View historical weather for Walnut · More cities in Illinois