With a population of around 16,500, Illertissen sits in Bavaria, Germany. The city operates in the Central European time zone.
In 2025, Illertissen recorded an average annual temperature of 49°F. The hottest temperatures reached 90°F in July; the coolest were 13°F in December. Total precipitation for the year was 35 inches, with the wettest month being September. Snowfall for the year totaled approximately 3 inches.
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