Weather on August 18 at Yellowstone
Yellowstone National Park
Based on 55 years of data from Jackson, WY
Elevation Note: Yellowstone sits at 7,350 ft. Expect temperatures 26°F cooler than the data shown below, which comes from Jackson, WY at a lower elevation.
Planning Your Visit
August 18th in Yellowstone National Park (via Jackson, WY) typically brings warm summer weather, with average highs around 80°F and lows near 40°F — a 40°F daily swing. Over 55 years of records, the warmest August 18th was in 1977 (69°F average), while the coldest was 2009 (48°F) — a 21°F range across recorded history. Rain or other precipitation has occurred on about 27% of August 18th dates historically, with the wettest August 18th recording 1.35" 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 August 18th in Yellowstone? Stay hydrated and seek shade during peak afternoon hours.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 77°F | 39°F | 0.38" | 0" |
| 2024 | 82°F | 46°F | 0" | 0" |
| 2023 | 85°F | 49°F | 0.25" | 0" |
| 2022 | 83°F | 43°F | 0" | 0" |
| 2021 | 82°F | 52°F | 0.84" | 0" |
| 2020 | 88°F | 41°F | 0" | 0" |
| 2019 | 72°F | 40°F | 0" | 0" |
| 2018 | 81°F | 44°F | 0.03" | 0" |
| 2017 | 76°F | 35°F | 0" | 0" |
| 2016 | 84°F | 43°F | 0" | 0" |
| 2015 | 72°F | 33°F | 0" | 0" |
| 2014 | 77°F | 38°F | 0" | 0" |
| 2013 | 83°F | 53°F | 0" | -- |
| 2012 | 80°F | 47°F | 0" | -- |
| 2011 | 82°F | 35°F | 0" | 0" |
| 2010 | 79°F | 33°F | 0" | 0" |
| 2009 | 68°F | 28°F | 0.08" | 0" |
| 2008 | 84°F | 36°F | 0" | 0" |
| 2007 | 76°F | 47°F | 0" | 0" |
| 2006 | 77°F | 30°F | -- | -- |
| 2005 | 73°F | 47°F | 1.35" | -- |
| 2004 | 73°F | 50°F | -- | -- |
| 2003 | 80°F | 36°F | -- | -- |
| 2002 | 83°F | 32°F | -- | -- |
| 2001 | 86°F | 37°F | -- | -- |
| 2000 | 59°F | 46°F | 0" | -- |
| 1999 | 85°F | 31°F | -- | -- |
| 1998 | 82°F | 54°F | 1.27" | 0" |
| 1997 | 80°F | 37°F | -- | 0" |
| 1996 | 87°F | 42°F | 0" | 0" |
| 1995 | 77°F | 43°F | 0.05" | 0" |
| 1994 | 86°F | 35°F | 0" | 0" |
| 1993 | 72°F | 33°F | 0" | 0" |
| 1992 | 80°F | 39°F | 0.25" | 0" |
| 1991 | 80°F | 39°F | 0" | 0" |
| 1990 | 79°F | 43°F | 0.23" | 0" |
| 1989 | 83°F | 40°F | 0.28" | 0" |
| 1988 | 90°F | 31°F | 0" | 0" |
| 1987 | 76°F | 26°F | 0" | 0" |
| 1986 | 89°F | 37°F | 0" | 0" |
| 1985 | 82°F | 35°F | 0" | 0" |
| 1984 | 83°F | 40°F | 0" | 0" |
| 1983 | 71°F | 55°F | 0.66" | 0" |
| 1982 | 88°F | 46°F | 0.08" | 0" |
| 1981 | 88°F | 36°F | 0" | 0" |
| 1980 | 75°F | 54°F | 0" | 0" |
| 1979 | 75°F | 47°F | 0.23" | 0" |
| 1978 | 65°F | 36°F | 0" | 0" |
| 1977 | 85°F | 54°F | 0" | 0" |
| 1976 | 76°F | 43°F | 0.51" | 0" |
| 1975 | 77°F | 34°F | 0" | 0" |
| 1974 | 85°F | 29°F | 0" | 0" |
| 1973 | 81°F | 45°F | 0" | 0" |
| 1972 | 77°F | 36°F | 0" | 0" |
| 1971 | 80°F | 38°F | 0" | 0" |