Weather on August 18
San Bernardino, CA
55 Years of Data
About This Date
August 18th in San Bernardino, CA typically brings hot summer weather, with average highs around 93°F and lows near 64°F — a 29°F daily swing. Over 48 years of records, the warmest August 18th was in 1986 (95°F average), while the coldest was 1976 (70°F) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 6% of August 18th dates historically, with the wettest August 18th recording 0.71" of rain.
Planning for August 18th in San Bernardino, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 97° | 64° | 80° | — | — |
| 2017 | 88° | 63° | 75° | — | — |
| 2016 | 98° | 70° | 84° | — | — |
| 2015 | 89° | 67° | 78° | — | — |
| 2014 | 98° | 67° | 82° | — | — |
| 2013 | 98° | 68° | 83° | — | — |
| 2012 | 99° | 74° | 86° | — | — |
| 2011 | 101° | 62° | 81° | — | — |
| 2010 | 97° | 69° | 83° | — | — |
| 2009 | 92° | 57° | 74° | — | — |
| 2008 | 91° | 62° | 77° | — | — |
| 2007 | 103° | 67° | 85° | — | — |
| 2006 | 92° | 62° | 77° | — | — |
| 2005 | 90° | 58° | 74° | — | — |
| 2004 | 94° | 66° | 80° | — | — |
| 2003 | 101° | 69° | 85° | — | — |
| 2002 | 90° | 64° | 77° | — | — |
| 2001 | 103° | 67° | 85° | — | — |
| 2000 | 100° | 67° | 83° | — | — |
| 1999 | 97° | 65° | 81° | — | — |
| 1998 | 90° | 59° | 74° | — | — |
| 1997 | 95° | 60° | 78° | — | — |
| 1996 | 90° | 64° | 77° | — | — |
| 1995 | 92° | 60° | 76° | — | — |
| 1994 | 94° | 70° | 82° | — | — |
| 1993 | 92° | 61° | 76° | — | — |
| 1992 | 102° | 72° | 87° | — | — |
| 1991 | 91° | 62° | 77° | — | — |
| 1990 | 85° | 61° | 73° | — | — |
| 1989 | 86° | 57° | 72° | — | — |
| 1988 | 92° | 61° | 76° | — | — |
| 1987 | 86° | 58° | 72° | — | — |
| 1986warmest | 98° | 92° | 95° | 0.05" | — |
| 1985 | 88° | 61° | 74° | — | — |
| 1984 | 87° | 73° | 80° | — | — |
| 1983 | 73° | 68° | 71° | 0.71" | — |
| 1982 | 102° | 66° | 84° | — | — |
| 1981 | 95° | 65° | 80° | — | — |
| 1980 | 83° | 63° | 73° | — | — |
| 1979 | 90° | 65° | 77° | — | — |
| 1978 | 95° | 55° | 75° | — | — |
| 1977 | 88° | 67° | 77° | 0.2" | — |
| 1976coldest | 83° | 58° | 70° | — | — |
| 1975 | 88° | 57° | 72° | — | — |
| 1974 | 96° | 59° | 78° | — | — |
| 1973 | 104° | 67° | 85° | — | — |
| 1972 | 84° | 60° | 72° | — | — |
| 1971 | 99° | 65° | 82° | — | — |
San Bernardino, CA Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
San Bernardino, CA Monthly Precipitation
Average rainfall and snowfall per month, in inches.
San Bernardino, CA Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit San Bernardino, CA
San Bernardino, CA has no months that meet our "pleasant" threshold — every season has tradeoffs.