Weather on September 18 at Theodore Roosevelt
Theodore Roosevelt National Park
Based on 55 years of data from Medora, ND
Elevation Note: Theodore Roosevelt sits at 2,600 ft. Expect temperatures 9°F cooler than the data shown below, which comes from Medora, ND at a lower elevation.
Planning Your Visit
September 18th in Theodore Roosevelt National Park (via Medora, ND) typically brings pleasant fall weather, with average highs around 73°F and lows near 43°F — a 30°F daily swing. Over 55 years of records, the warmest September 18th was in 2004 (77°F average), while the coldest was 2006 (37°F) — a 40°F range across recorded history. Precipitation has occurred on 24% of recorded September 18th dates, with snow falling 2% of the time (heaviest snowfall: 1.1"). 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 Theodore Roosevelt? Great weather for outdoor activities.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 83°F | 54°F | 0.05" | -- |
| 2024 | 93°F | 56°F | 0.25" | -- |
| 2023 | 84°F | 55°F | 0" | -- |
| 2022 | 75°F | 43°F | 0" | -- |
| 2021 | 73°F | 37°F | 0" | -- |
| 2020 | 74°F | 47°F | 0" | -- |
| 2019 | 85°F | 56°F | 0.71" | -- |
| 2018 | 67°F | 47°F | 0" | -- |
| 2017 | 64°F | 36°F | 0.03" | -- |
| 2016 | 82°F | 45°F | 0" | -- |
| 2015 | 65°F | 45°F | 0.1" | -- |
| 2014 | 74°F | 40°F | 0" | -- |
| 2013 | 87°F | 57°F | 1.02" | -- |
| 2012 | 79°F | 47°F | 0" | -- |
| 2011 | 60°F | 35°F | 0" | -- |
| 2010 | 43°F | 31°F | 1.12" | 1.1" |
| 2009 | 90°F | 48°F | 0" | 0" |
| 2008 | 89°F | 46°F | 0" | 0" |
| 2007 | 83°F | 47°F | 0" | 0" |
| 2006 | 40°F | 35°F | 1.19" | 0" |
| 2005 | 65°F | 38°F | 0" | 0" |
| 2004 | 94°F | 60°F | 0" | 0" |
| 2003 | 57°F | 36°F | -- | -- |
| 2002 | 86°F | 54°F | 0" | 0" |
| 2001 | 75°F | 48°F | 0" | 0" |
| 2000 | 80°F | 52°F | -- | -- |
| 1999 | 82°F | 47°F | 0" | 0" |
| 1998 | 94°F | 52°F | 0" | 0" |
| 1997 | 75°F | 41°F | 0" | 0" |
| 1996 | 59°F | 55°F | 3.81" | 0" |
| 1995 | 58°F | 30°F | -- | 0" |
| 1994 | 86°F | 43°F | 0" | 0" |
| 1993 | 64°F | 31°F | 0" | 0" |
| 1992 | 62°F | 35°F | 0" | 0" |
| 1991 | 46°F | 33°F | 0" | 0" |
| 1990 | 74°F | 44°F | 0" | 0" |
| 1989 | 96°F | 54°F | 0" | 0" |
| 1988 | 68°F | 45°F | 1.96" | 0" |
| 1987 | 65°F | 38°F | 0" | 0" |
| 1986 | 62°F | 49°F | 0.56" | 0" |
| 1985 | 76°F | 41°F | 0" | 0" |
| 1984 | 94°F | 38°F | 0" | 0" |
| 1983 | 58°F | 39°F | 0" | 0" |
| 1982 | 77°F | 30°F | 0" | 0" |
| 1981 | 85°F | 32°F | 0" | 0" |
| 1980 | 62°F | 42°F | 0" | 0" |
| 1979 | 79°F | 35°F | 0" | 0" |
| 1978 | 54°F | 46°F | 1.47" | 0" |
| 1977 | 63°F | 48°F | 1.09" | 0" |
| 1976 | 90°F | 46°F | 0" | 0" |
| 1975 | 58°F | -- | 0" | 0" |
| 1974 | 84°F | 39°F | 0" | 0" |
| 1973 | 74°F | 38°F | 0" | 0" |
| 1972 | 85°F | 43°F | 0" | 0" |
| 1971 | 57°F | 33°F | 0" | 0" |