Bundaberg features a warm humid subtropical climate (Köppen classification: Cfa) marked by hot, wet summers and very mild, dry winters. The city experiences significant temperature variations throughout the year, with mean maximum temperatures ranging from 22.3°C (72.1°F) in July to 30.4°C (86.7°F) in January.

The annual rainfall averages approximately 997.0 millimeters (39.25 inches), with a pronounced peak during the summer months and a noticeable dip in winter. Extreme weather has shaped Bundaberg's climate history, with record temperatures ranging from a frigid −0.7°C (30.7°F) recorded on 16 July 1918 to a blistering 40.2°C (104.4°F) on 19 December 1901.

Climate data for Bundaberg illustrates the following monthly temperature and precipitation patterns (1942-2024 normals):

• January: Average high of 30.4°C (86.7°F), average precipitation of 167.3 mm (6.59 in).
• February: Average high of 30.2°C (86.4°F), average precipitation of 154.1 mm (6.07 in).
• March: Average high of 29.4°C (84.9°F), average precipitation of 111.7 mm (4.40 in).
• April: Average high of 27.6°C (81.7°F), average precipitation of 55.8 mm (2.20 in).
• May: Average high of 24.9°C (76.8°F), average precipitation of 66.3 mm (2.61 in).
• June: Average high of 22.7°C (72.9°F), average precipitation of 48.3 mm (1.90 in).
• July: Average high of 22.3°C (72.1°F), average precipitation of 39.3 mm (1.55 in).
• August: Average high of 23.6°C (74.5°F), average precipitation of 32.5 mm (1.28 in).
• September: Average high of 25.7°C (78.3°F), average precipitation of 34.1 mm (1.34 in).
• October: Average high of 27.2°C (81.0°F), average precipitation of 78.0 mm (3.07 in).
• November: Average high of 28.6°C (83.5°F), average precipitation of 86.5 mm (3.41 in).
• December: Average high of 29.7°C (85.5°F), average precipitation of 123.6 mm (4.87 in).

Overall, Bundaberg’s climate is characterized by warm, humid summers ideal for outdoor activities and tourism, while its mild winters provide a comfortable respite from the heat. The city’s weather patterns play a significant role in shaping its lifestyle and agricultural productivity, making it a unique destination in Queensland.