Weather on August 18
Nampa, ID
55 Years of Data
Avg High
89°F
Avg Low
54°F
Warmest
2001
81°F avg
Coldest
1978
55°F avg
About This Date
August 18th in Nampa, ID typically brings warm summer weather, with average highs around 89°F and lows near 54°F — a 35°F daily swing. Over 44 years of records, the warmest August 18th was in 2001 (81°F average), while the coldest was 1978 (55°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 9% of August 18th dates historically.
Planning for August 18th in Nampa, ID? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2014 | 95° | 59° | 77° | — | — |
| 2013 | 93° | 67° | 80° | — | — |
| 2012 | 95° | 59° | 77° | — | — |
| 2011 | 94° | 56° | 75° | — | — |
| 2010 | 99° | 56° | 77° | — | — |
| 2009 | 84° | 51° | 68° | — | — |
| 2008 | 101° | 59° | 80° | — | — |
| 2007 | 91° | 57° | 74° | — | — |
| 2006 | 83° | 54° | 68° | — | — |
| 2005 | 90° | 60° | 75° | — | — |
| 2004 | 81° | 56° | 68° | 0.41" | — |
| 2003 | 90° | 58° | 74° | — | — |
| 2002 | 91° | 52° | 71° | — | — |
| 2001warmest | 101° | 62° | 81° | — | — |
| 2000 | 95° | 55° | 75° | — | — |
| 1999 | 97° | 54° | 75° | — | — |
| 1998 | 85° | 52° | 68° | — | — |
| 1997 | 91° | 54° | 72° | — | — |
| 1996 | 85° | 40° | 62° | — | — |
| 1995 | 75° | 44° | 60° | — | — |
| 1994 | 90° | 49° | 69° | — | — |
| 1993 | 80° | 49° | 64° | — | — |
| 1992 | 94° | 55° | 74° | — | — |
| 1991 | 92° | 60° | 76° | — | — |
| 1990 | 68° | 56° | 62° | 0.08" | — |
| 1989 | 90° | 51° | 70° | — | — |
| 1988 | 92° | 57° | 74° | — | — |
| 1987 | 80° | 42° | 61° | — | — |
| 1986 | 95° | 53° | 74° | — | — |
| 1985 | 91° | 56° | 73° | — | — |
| 1984 | 97° | 61° | 79° | — | — |
| 1983 | 95° | 59° | 77° | — | — |
| 1982 | 92° | 56° | 74° | — | — |
| 1981 | 95° | 58° | 76° | — | — |
| 1980 | 83° | 50° | 66° | 0.05" | — |
| 1979 | 77° | 53° | 65° | — | — |
| 1978coldest | 73° | 37° | 55° | — | — |
| 1977 | 94° | 57° | 75° | — | — |
| 1976 | 74° | 55° | 64° | — | — |
| 1975 | 74° | 58° | 66° | 0.43" | — |
| 1974 | 95° | 55° | 75° | — | — |
| 1973 | 88° | 53° | 70° | — | — |
| 1972 | 85° | 50° | 67° | — | — |
| 1971 | 97° | 54° | 75° | — | — |
44 years of data from NAMPA SUGAR FACTORY