Dumbarton

What is the climate like in Dumbarton?

The best time to visit Dumbarton is typically October – November, with trip comfort peaking in October (6.7/10). Dumbarton is warmest in July, when daily highs average 91°F (33°C), and coolest in January, when lows fall to about 33°F (1°C). The wettest month is typically August and the driest is November; the year sees roughly 47 in (1194 mm) of precipitation.

• Best time to visitOctober – November — comfort peaks in October (6.7/10)
• Warmest monthJuly — average high 91°F (33°C)
• Coolest monthJanuary — average low 33°F (1°C)
• Wettest monthAugust (4.9 in (125 mm))
• Driest monthNovember (2.5 in (64 mm))
• Annual precipitation47 in (1194 mm)
• Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
• Records fromAshland, 17 km away (1893-2026)