Weather on September 21 in Oslo
Historical weather data for September 21 in Oslo, Norway
Based on 55 years of data from OSLO - BLINDERN PLU
About This Date
September 21st in Oslo, Norway typically brings mild fall weather, with average highs around 16°C and lows near 8°C. Over 55 years of records, the warmest September 21st was in 2006 (17°C average), while the coldest was 1990 (6°C) — a 19°F range across recorded history. Rain or other precipitation has occurred on about 51% of September 21st dates historically, with the wettest September 21st recording 3.82" of rain. The last decade has been 1.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.7°F warmer on this date compared to 20-30 years ago.
Planning for September 21st in Oslo? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip |
|---|---|---|---|
| 2025 | 17°C (62°F) | 9°C (49°F) | 0.14" |
| 2024 | 14°C (58°F) | 11°C (52°F) | 0.1" |
| 2023 | 18°C (64°F) | 14°C (57°F) | 3.33" |
| 2022 | 16°C (60°F) | 3°C (37°F) | 0" |
| 2021 | 17°C (63°F) | 9°C (48°F) | 0" |
| 2020 | 19°C (67°F) | 12°C (54°F) | 0" |
| 2019 | 23°C (73°F) | 6°C (42°F) | 0" |
| 2018 | 16°C (60°F) | 8°C (47°F) | 1.91" |
| 2017 | 11°C (52°F) | 7°C (44°F) | 0" |
| 2016 | 18°C (64°F) | 12°C (54°F) | 0.17" |
| 2015 | 14°C (57°F) | 9°C (48°F) | 0" |
| 2014 | 14°C (58°F) | 11°C (52°F) | 0.02" |
| 2013 | 17°C (63°F) | 7°C (44°F) | 0" |
| 2012 | 13°C (55°F) | 1°C (34°F) | 0" |
| 2011 | 16°C (61°F) | 11°C (52°F) | 0.17" |
| 2010 | 16°C (61°F) | 7°C (45°F) | 0" |
| 2009 | 17°C (62°F) | 5°C (41°F) | 0.33" |
| 2008 | 16°C (61°F) | 6°C (43°F) | 0" |
| 2007 | 14°C (57°F) | 8°C (47°F) | 0" |
| 2006 | 21°C (69°F) | 13°C (55°F) | 0" |
| 2005 | 17°C (62°F) | 7°C (45°F) | 0" |
| 2004 | 13°C (56°F) | 9°C (49°F) | 1" |
| 2003 | 16°C (61°F) | 9°C (48°F) | 0.45" |
| 2002 | 13°C (56°F) | 4°C (40°F) | 2.45" |
| 2001 | 14°C (58°F) | 9°C (48°F) | 0.14" |
| 2000 | 16°C (61°F) | 7°C (45°F) | 0" |
| 1999 | 18°C (64°F) | 13°C (56°F) | 1.6" |
| 1998 | 20°C (68°F) | 12°C (53°F) | 0" |
| 1997 | 19°C (66°F) | 8°C (47°F) | 0" |
| 1996 | 12°C (54°F) | 6°C (42°F) | 0" |
| 1995 | 18°C (64°F) | 4°C (40°F) | 0" |
| 1994 | 15°C (59°F) | 2°C (36°F) | 0" |
| 1993 | 11°C (51°F) | 8°C (46°F) | 1.02" |
| 1992 | 14°C (58°F) | 11°C (52°F) | 0.16" |
| 1991 | 15°C (59°F) | 3°C (38°F) | 0.11" |
| 1990 | 11°C (51°F) | 1°C (34°F) | 0.04" |
| 1989 | 19°C (67°F) | 13°C (56°F) | 0" |
| 1988 | 16°C (61°F) | 9°C (49°F) | 0.09" |
| 1987 | 12°C (53°F) | 1°C (34°F) | 0.11" |
| 1986 | 18°C (64°F) | 9°C (48°F) | 0" |
| 1985 | 13°C (56°F) | 2°C (36°F) | 0" |
| 1984 | 11°C (51°F) | 7°C (45°F) | 1.46" |
| 1983 | 13°C (56°F) | 8°C (46°F) | 0" |
| 1982 | 16°C (60°F) | 9°C (49°F) | 1.12" |
| 1981 | 13°C (55°F) | 9°C (48°F) | 3.82" |
| 1980 | 14°C (57°F) | 12°C (54°F) | 0" |
| 1979 | 13°C (56°F) | 8°C (46°F) | 0.04" |
| 1978 | 15°C (59°F) | 2°C (35°F) | 0.01" |
| 1977 | 18°C (65°F) | 7°C (44°F) | 0" |
| 1976 | 16°C (60°F) | 3°C (38°F) | 0" |
| 1975 | 14°C (57°F) | 8°C (47°F) | 0" |
| 1974 | 13°C (55°F) | 4°C (40°F) | 0.51" |
| 1973 | 13°C (56°F) | 8°C (46°F) | 0.01" |
| 1972 | 13°C (56°F) | 8°C (47°F) | 0.03" |
| 1971 | 15°C (59°F) | 8°C (47°F) | 0.01" |