Weather on June 18
Rancho Cucamonga, CA
55 Years of Data
About This Date
June 18th in Rancho Cucamonga, CA typically brings warm summer weather, with average highs around 86°F and lows near 58°F — a 28°F daily swing. Over 43 years of records, the warmest June 18th was in 1981 (85°F average), while the coldest was 1975 (55°F) — a 30°F range across recorded history. Rain or other precipitation has occurred on about 2% of June 18th dates historically. The last decade has been 1.6°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.6°F warmer on this date compared to 20-30 years ago.
Planning for June 18th in Rancho Cucamonga, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 80° | 61° | 70° | — | — |
| 2025 | 96° | 65° | 80° | — | — |
| 2024 | 83° | 60° | 71° | — | — |
| 2023 | 81° | 59° | 70° | — | — |
| 2022 | 80° | 59° | 70° | — | — |
| 2021 | 94° | 68° | 81° | — | — |
| 2020 | 77° | 59° | 68° | — | — |
| 2019 | 82° | 64° | 73° | — | — |
| 2018 | 79° | 58° | 68° | — | — |
| 2017 | 97° | 65° | 81° | — | — |
| 2016 | 99° | 60° | 79° | — | — |
| 2015 | 98° | 62° | 80° | — | — |
| 2014 | 84° | 57° | 71° | — | — |
| 2013 | 88° | 61° | 74° | — | — |
| 2012 | 88° | 58° | 73° | — | — |
| 2011 | 81° | 59° | 70° | — | — |
| 2010 | 82° | 57° | 70° | — | — |
| 2009 | 87° | 58° | 72° | — | — |
| 2008 | 103° | 65° | 84° | — | — |
| 2007 | 89° | 58° | 73° | — | — |
| 2006 | 90° | 64° | 77° | — | — |
| 2005 | 79° | 56° | 67° | — | — |
| 2004 | 82° | 58° | 70° | — | — |
| 2003 | 80° | 61° | 70° | — | — |
| 2002 | 89° | 60° | 75° | — | — |
| 2001 | 94° | 61° | 77° | — | — |
| 2000 | 83° | 61° | 72° | — | — |
| 1999 | 92° | 58° | 75° | — | — |
| 1998 | 87° | 56° | 71° | — | — |
| 1984 | 94° | 56° | 75° | — | — |
| 1983 | 87° | 56° | 71° | — | — |
| 1982 | 66° | 56° | 61° | — | — |
| 1981warmest | 104° | 66° | 85° | — | — |
| 1980 | 87° | 56° | 71° | — | — |
| 1979 | 75° | 52° | 63° | — | — |
| 1978 | 95° | 61° | 78° | — | — |
| 1977 | 85° | 50° | 67° | — | — |
| 1976 | 90° | 51° | 70° | — | — |
| 1975coldest | 61° | 50° | 55° | 0.06" | — |
| 1974 | 82° | 45° | 63° | — | — |
| 1973 | 93° | 51° | 72° | — | — |
| 1972 | 83° | 58° | 70° | — | — |
| 1971 | 86° | 54° | 70° | — | — |
Rancho Cucamonga, CA Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Rancho Cucamonga, CA Monthly Precipitation
Average rainfall per month, in inches.
Rancho Cucamonga, 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 Rancho Cucamonga, CA
Most pleasant months in Rancho Cucamonga, CA: January, February, March, April, May, October, November, December.
What to expect on June 18th
This page shows what actually happened each year. For the odds — typical high and low, and how often it stays dry — see the climatological outlook for this date.
June 18th outlook →