Weather on September 18 in Helsinki
Historical weather data for September 18 in Helsinki, Finland
Based on 55 years of data from HELSINKI RAUTATIENTORI
About This Date
September 18th in Helsinki, Finland typically brings cool fall weather, with average highs around 14°C and lows near 8°C. Over 55 years of records, the warmest September 18th was in 1975 (17°C average), while the coldest was 1993 (6°C) — a 21°F range across recorded history. Rain or other precipitation has occurred on about 36% of September 18th dates historically, with the wettest September 18th recording 1.69" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for September 18th in Helsinki? Bring layers as temperatures can vary throughout the day. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip |
|---|---|---|---|
| 2025 | 18°C (64°F) | 13°C (55°F) | 0.39" |
| 2024 | 17°C (62°F) | 10°C (50°F) | 0" |
| 2023 | 16°C (60°F) | 6°C (42°F) | 0" |
| 2022 | 16°C (61°F) | 8°C (47°F) | 0" |
| 2021 | 11°C (52°F) | 7°C (44°F) | 0.02" |
| 2020 | 14°C (58°F) | 6°C (43°F) | 0" |
| 2019 | 13°C (56°F) | 7°C (44°F) | 0.01" |
| 2018 | 16°C (60°F) | 10°C (50°F) | 0" |
| 2017 | 13°C (55°F) | 6°C (42°F) | 0" |
| 2016 | 16°C (60°F) | 7°C (45°F) | 0" |
| 2015 | 18°C (65°F) | 16°C (60°F) | -- |
| 2014 | 17°C (63°F) | 10°C (50°F) | -- |
| 2013 | 17°C (62°F) | 14°C (58°F) | -- |
| 2012 | 17°C (62°F) | 12°C (54°F) | -- |
| 2011 | 16°C (61°F) | 9°C (49°F) | 0" |
| 2010 | 14°C (57°F) | 11°C (52°F) | -- |
| 2009 | 14°C (58°F) | 8°C (47°F) | 0" |
| 2008 | 8°C (47°F) | 6°C (43°F) | 0.01" |
| 2007 | 13°C (56°F) | 9°C (48°F) | 1.69" |
| 2006 | 16°C (61°F) | 7°C (44°F) | 0" |
| 2005 | 14°C (57°F) | 3°C (37°F) | 0.01" |
| 2004 | 14°C (58°F) | 12°C (54°F) | 0.02" |
| 2003 | 16°C (61°F) | 6°C (43°F) | 0" |
| 2002 | 13°C (56°F) | 8°C (46°F) | 0" |
| 2001 | 18°C (64°F) | 14°C (58°F) | 0" |
| 2000 | 14°C (57°F) | 4°C (39°F) | 0" |
| 1999 | 16°C (61°F) | 9°C (49°F) | 0" |
| 1998 | 16°C (60°F) | 11°C (52°F) | 1.47" |
| 1997 | 12°C (54°F) | 8°C (46°F) | 0.08" |
| 1996 | 16°C (61°F) | 3°C (37°F) | 0" |
| 1995 | 15°C (59°F) | 3°C (38°F) | 0" |
| 1994 | 14°C (58°F) | 12°C (53°F) | 1.35" |
| 1993 | 11°C (52°F) | 0°C (32°F) | 0" |
| 1992 | 14°C (58°F) | 12°C (53°F) | 0.01" |
| 1991 | 12°C (53°F) | 3°C (38°F) | 0" |
| 1990 | 12°C (54°F) | 8°C (47°F) | 0.1" |
| 1989 | 16°C (60°F) | 12°C (53°F) | 0" |
| 1988 | 12°C (53°F) | 7°C (45°F) | 0" |
| 1987 | 12°C (53°F) | 2°C (35°F) | 0.96" |
| 1986 | 11°C (52°F) | 2°C (35°F) | 0" |
| 1985 | 14°C (57°F) | 6°C (43°F) | 0" |
| 1984 | 13°C (55°F) | 8°C (46°F) | 0.57" |
| 1983 | 17°C (62°F) | 13°C (56°F) | 0.22" |
| 1982 | 14°C (57°F) | 11°C (52°F) | 0" |
| 1981 | 12°C (53°F) | 3°C (38°F) | 0" |
| 1980 | 13°C (55°F) | 11°C (51°F) | 0" |
| 1979 | 13°C (55°F) | 10°C (50°F) | 0.94" |
| 1978 | 13°C (55°F) | 8°C (47°F) | 0.01" |
| 1977 | 13°C (55°F) | 2°C (36°F) | 0" |
| 1976 | 13°C (55°F) | 7°C (44°F) | 0" |
| 1975 | 21°C (70°F) | 13°C (56°F) | 0" |
| 1974 | 15°C (59°F) | 13°C (55°F) | 0.12" |
| 1973 | 11°C (51°F) | 1°C (34°F) | 0.01" |
| 1972 | 16°C (61°F) | 10°C (50°F) | 0" |
| 1971 | 13°C (55°F) | 3°C (37°F) | 0.01" |