Weather on September 12 in Helsinki
Historical weather data for September 12 in Helsinki, Finland
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
| Year | High | Low | Precip (mm) |
|---|---|---|---|
| 2025 | 19°C (66°F) | 15°C (59°F) | 47 mm |
| 2024 | 19°C (67°F) | 16°C (60°F) | 34 mm |
| 2023 | 19°C (66°F) | 16°C (60°F) | 4 mm |
| 2022 | 17°C (63°F) | 6°C (43°F) | 0 mm |
| 2021 | 15°C (59°F) | 12°C (54°F) | 32 mm |
| 2020 | 15°C (59°F) | 13°C (55°F) | 25 mm |
| 2019 | 17°C (63°F) | 15°C (59°F) | 1 mm |
| 2018 | 18°C (64°F) | 12°C (54°F) | 7 mm |
| 2017 | 17°C (63°F) | 13°C (56°F) | 0 mm |
| 2016 | 20°C (68°F) | 14°C (58°F) | 0 mm |
| 2015 | 18°C (65°F) | 13°C (55°F) | -- |
| 2014 | 18°C (65°F) | 13°C (56°F) | -- |
| 2013 | 20°C (68°F) | 14°C (57°F) | -- |
| 2012 | 17°C (63°F) | 13°C (56°F) | -- |
| 2011 | 18°C (64°F) | 15°C (59°F) | -- |
| 2010 | 17°C (63°F) | 14°C (58°F) | -- |
| 2009 | 17°C (63°F) | 8°C (47°F) | 8 mm |
| 2008 | 13°C (55°F) | 4°C (40°F) | 0 mm |
| 2007 | 16°C (60°F) | 10°C (50°F) | 7 mm |
| 2006 | 18°C (65°F) | 12°C (54°F) | 0 mm |
| 2005 | 16°C (61°F) | 10°C (50°F) | 0 mm |
| 2004 | 17°C (62°F) | 12°C (54°F) | 23 mm |
| 2003 | 15°C (59°F) | 13°C (55°F) | 0 mm |
| 2002 | 19°C (67°F) | 6°C (43°F) | 0 mm |
| 2001 | 16°C (61°F) | 14°C (57°F) | 4 mm |
| 2000 | 15°C (59°F) | 8°C (46°F) | 0 mm |
| 1999 | 16°C (61°F) | 9°C (48°F) | 0 mm |
| 1998 | 17°C (62°F) | 15°C (59°F) | 3 mm |
| 1997 | 16°C (60°F) | 7°C (44°F) | 24 mm |
| 1996 | 11°C (51°F) | 7°C (44°F) | 21 mm |
| 1995 | 14°C (57°F) | 8°C (47°F) | 0 mm |
| 1994 | 16°C (61°F) | 12°C (53°F) | 2 mm |
| 1993 | 13°C (55°F) | 2°C (35°F) | 3 mm |
| 1992 | 17°C (62°F) | 10°C (50°F) | 0 mm |
| 1991 | 12°C (53°F) | 7°C (44°F) | 0 mm |
| 1990 | 11°C (52°F) | 4°C (39°F) | 0 mm |
| 1989 | 12°C (54°F) | 3°C (37°F) | 0 mm |
| 1988 | 15°C (59°F) | 12°C (53°F) | 19 mm |
| 1987 | 14°C (57°F) | 9°C (49°F) | 4 mm |
| 1986 | 12°C (54°F) | 8°C (47°F) | 4 mm |
| 1985 | 15°C (59°F) | 7°C (44°F) | 0 mm |
| 1984 | 13°C (55°F) | 11°C (51°F) | 2 mm |
| 1983 | 14°C (58°F) | 12°C (54°F) | 11 mm |
| 1982 | 17°C (63°F) | 9°C (48°F) | 0 mm |
| 1981 | 13°C (56°F) | 9°C (48°F) | 13 mm |
| 1980 | 14°C (58°F) | 11°C (52°F) | 1 mm |
| 1979 | 14°C (57°F) | 8°C (46°F) | 5 mm |
| 1978 | 13°C (56°F) | 9°C (49°F) | 9 mm |
| 1977 | 11°C (51°F) | 7°C (44°F) | 63 mm |
| 1976 | 13°C (56°F) | 11°C (52°F) | 25 mm |
| 1975 | 19°C (67°F) | 13°C (56°F) | 0 mm |
| 1974 | 17°C (62°F) | 8°C (47°F) | 9 mm |
| 1973 | 8°C (47°F) | 2°C (35°F) | 18 mm |
| 1972 | 19°C (67°F) | 13°C (55°F) | 0 mm |
| 1971 | 14°C (57°F) | 7°C (44°F) | 4 mm |