Mariehamn

What is the climate like in Mariehamn?

The best time to visit Mariehamn is typically June – September, with trip comfort peaking in July (7.3/10). Mariehamn is warmest in July, when daily highs average 64°F (18°C), and coolest in February, when lows fall to about 31°F (-1°C). The wettest month is typically October and the driest is May; the year sees roughly 24 in (608 mm) of precipitation.

• Best time to visitJune – September — comfort peaks in July (7.3/10)
• Warmest monthJuly — average high 64°F (18°C)
• Coolest monthFebruary — average low 31°F (-1°C)
• Wettest monthOctober (3.2 in (81 mm))
• Driest monthMay (1.2 in (29 mm))
• Annual precipitation24 in (608 mm)
• Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
• Records fromJomala Maarianhaminan Lentoase, 3 km away (1959-2026)