Weather on March 18
Rancho Cucamonga, CA
55 Years of Data
Avg High
72°F
Avg Low
47°F
Warmest
2026
80°F avg
Coldest
2012
45°F avg
About This Date
March 18th in Rancho Cucamonga, CA typically brings pleasant spring weather, with average highs around 72°F and lows near 47°F — a 25°F daily swing. Over 42 years of records, the warmest March 18th was in 2026 (80°F average), while the coldest was 2012 (45°F) — a 35°F range across recorded history. Rain or other precipitation has occurred on about 19% of March 18th dates historically, with the wettest March 18th recording 2.49" of rain. The last decade has been 2.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.7°F warmer on this date compared to 20-30 years ago.
Planning for March 18th in Rancho Cucamonga, CA? Great weather for outdoor activities.
Warming Trend
1.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026warmest | 97° | 64° | 80° | — | — |
| 2025 | 65° | 43° | 54° | — | — |
| 2024 | 77° | 46° | 62° | — | — |
| 2023 | 74° | 47° | 60° | — | — |
| 2022 | 80° | 50° | 65° | — | — |
| 2021 | 72° | 46° | 59° | — | — |
| 2020 | 58° | 42° | 50° | — | — |
| 2019 | 85° | 55° | 70° | — | — |
| 2018 | 63° | 43° | 53° | — | — |
| 2017 | 83° | 51° | 67° | — | — |
| 2016 | 79° | 52° | 65° | — | — |
| 2015 | 75° | 57° | 66° | — | — |
| 2014 | 80° | 53° | 67° | — | — |
| 2013 | 64° | 51° | 58° | — | — |
| 2012coldest | 52° | 39° | 45° | 0.43" | — |
| 2011 | 70° | 45° | 57° | — | — |
| 2010 | 77° | 51° | 64° | — | — |
| 2009 | 86° | 51° | 69° | — | — |
| 2008 | 74° | 46° | 60° | — | — |
| 2007 | 68° | 53° | 61° | — | — |
| 2006 | 56° | 43° | 49° | 0.28" | — |
| 2005 | 62° | 49° | 55° | 0.33" | — |
| 2004 | 86° | 53° | 70° | — | — |
| 2003 | 69° | 42° | 56° | — | — |
| 2002 | 64° | 40° | 52° | 0.15" | — |
| 2001 | 81° | 50° | 65° | — | — |
| 2000 | 83° | 46° | 64° | — | — |
| 1999 | 69° | 41° | 55° | — | — |
| 1984 | 80° | 57° | 69° | — | — |
| 1983 | 57° | 48° | 53° | 0.61" | — |
| 1982 | 55° | 38° | 46° | 2.49" | — |
| 1981 | 70° | 41° | 55° | — | — |
| 1980 | 68° | 44° | 56° | 0.33" | — |
| 1979 | 53° | 41° | 47° | 0.56" | — |
| 1978 | 82° | 58° | 70° | — | — |
| 1977 | 63° | 34° | 48° | — | — |
| 1976 | 73° | 44° | 59° | — | — |
| 1975 | 73° | 38° | 55° | — | — |
| 1974 | 74° | 44° | 59° | — | — |
| 1973 | 62° | 41° | 52° | — | — |
| 1972 | 65° | 45° | 55° | — | — |
| 1971 | 79° | 40° | 59° | — | — |
42 years of data from ONTARIO INTL AP