Weather on September 12 in Helsinki

Historical weather data for September 12 in Helsinki, Finland

Avg High16°C (60°F)
Avg Low10°C (50°F)
Warmest202418°C
Coldest19735°C

Based on 55 years of data from HELSINKI RAUTATIENTORI

About This Date

September 12th in Helsinki, Finland typically brings mild fall weather, with average highs around 16°C and lows near 10°C. Over 55 years of records, the warmest September 12th was in 2024 (18°C average), while the coldest was 1973 (5°C) — a 23°F range across recorded history. Rain or other precipitation has occurred on about 60% of September 12th dates historically, with the wettest September 12th recording 2.49" of rain. The last decade has been 4.6°F warmer on this date compared to 20-30 years ago.

The last decade has been 4.6°F warmer on this date compared to 20-30 years ago.

Planning for September 12th in Helsinki? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.

Year by Year History

YearHighLowPrecip
202519°C (66°F)15°C (59°F)1.84"
202419°C (67°F)16°C (60°F)1.35"
202319°C (66°F)16°C (60°F)0.14"
202217°C (63°F)6°C (43°F)0"
202115°C (59°F)12°C (54°F)1.26"
202015°C (59°F)13°C (55°F)0.98"
201917°C (63°F)15°C (59°F)0.04"
201818°C (64°F)12°C (54°F)0.28"
201717°C (63°F)13°C (56°F)0.01"
201620°C (68°F)14°C (58°F)0"
201518°C (65°F)13°C (55°F)--
201418°C (65°F)13°C (56°F)--
201320°C (68°F)14°C (57°F)--
201217°C (63°F)13°C (56°F)--
201118°C (64°F)15°C (59°F)--
201017°C (63°F)14°C (58°F)--
200917°C (63°F)8°C (47°F)0.33"
200813°C (55°F)4°C (40°F)0"
200716°C (60°F)10°C (50°F)0.26"
200618°C (65°F)12°C (54°F)0"
200516°C (61°F)10°C (50°F)0.01"
200417°C (62°F)12°C (54°F)0.91"
200315°C (59°F)13°C (55°F)0"
200219°C (67°F)6°C (43°F)0"
200116°C (61°F)14°C (57°F)0.14"
200015°C (59°F)8°C (46°F)0.01"
199916°C (61°F)9°C (48°F)0"
199817°C (62°F)15°C (59°F)0.13"
199716°C (60°F)7°C (44°F)0.95"
199611°C (51°F)7°C (44°F)0.82"
199514°C (57°F)8°C (47°F)0"
199416°C (61°F)12°C (53°F)0.08"
199313°C (55°F)2°C (35°F)0.13"
199217°C (62°F)10°C (50°F)0"
199112°C (53°F)7°C (44°F)0"
199011°C (52°F)4°C (39°F)0"
198912°C (54°F)3°C (37°F)0"
198815°C (59°F)12°C (53°F)0.76"
198714°C (57°F)9°C (49°F)0.15"
198612°C (54°F)8°C (47°F)0.17"
198515°C (59°F)7°C (44°F)0"
198413°C (55°F)11°C (51°F)0.07"
198314°C (58°F)12°C (54°F)0.43"
198217°C (63°F)9°C (48°F)0"
198113°C (56°F)9°C (48°F)0.53"
198014°C (58°F)11°C (52°F)0.05"
197914°C (57°F)8°C (46°F)0.2"
197813°C (56°F)9°C (49°F)0.34"
197711°C (51°F)7°C (44°F)2.49"
197613°C (56°F)11°C (52°F)0.99"
197519°C (67°F)13°C (56°F)0"
197417°C (62°F)8°C (47°F)0.36"
19738°C (47°F)2°C (35°F)0.69"
197219°C (67°F)13°C (55°F)0"
197114°C (57°F)7°C (44°F)0.15"

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