Weather on May 17
Rancho Cucamonga, CA
55 Years of Data
About This Date
May 17th in Rancho Cucamonga, CA typically brings pleasant spring weather, with average highs around 79°F and lows near 53°F — a 26°F daily swing. Over 42 years of records, the warmest May 17th was in 2008 (83°F average), while the coldest was 1977 (53°F) — a 30°F range across recorded history. Rain or other precipitation has occurred on about 7% of May 17th dates historically. The last decade has been 2.7°F cooler on this date compared to 20-30 years ago.
The last decade has been 2.7°F cooler on this date compared to 20-30 years ago.
Planning for May 17th in Rancho Cucamonga, CA? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 68° | 59° | 64° | — | — |
| 2025 | 65° | 56° | 60° | 0.03" | — |
| 2024 | 71° | 55° | 63° | — | — |
| 2023 | 85° | 56° | 70° | — | — |
| 2022 | 78° | 56° | 67° | — | — |
| 2021 | 66° | 55° | 61° | — | — |
| 2020 | 84° | 60° | 72° | — | — |
| 2019 | 76° | 55° | 65° | — | — |
| 2018 | 76° | 53° | 64° | — | — |
| 2017 | 62° | 52° | 57° | — | — |
| 2016 | 78° | 59° | 69° | — | — |
| 2015 | 74° | 53° | 63° | — | — |
| 2014 | 91° | 64° | 78° | — | — |
| 2013 | 72° | 60° | 66° | — | — |
| 2012 | 87° | 59° | 73° | — | — |
| 2011 | 65° | 50° | 57° | 0.1" | — |
| 2010 | 65° | 54° | 59° | 0.08" | — |
| 2009 | 93° | 62° | 78° | — | — |
| 2008warmest | 102° | 65° | 83° | — | — |
| 2007 | 81° | 55° | 68° | — | — |
| 2006 | 88° | 45° | 66° | — | — |
| 2005 | 75° | 55° | 65° | — | — |
| 2004 | 76° | 58° | 67° | — | — |
| 2003 | 81° | 59° | 70° | — | — |
| 2002 | 81° | 55° | 68° | — | — |
| 2001 | 86° | 56° | 71° | — | — |
| 2000 | 75° | 48° | 62° | — | — |
| 1999 | 87° | 52° | 69° | — | — |
| 1984 | 86° | 47° | 66° | — | — |
| 1983 | 84° | 50° | 67° | — | — |
| 1982 | 90° | 52° | 71° | — | — |
| 1981 | 83° | 42° | 62° | — | — |
| 1980 | 80° | 49° | 64° | — | — |
| 1979 | 80° | 51° | 66° | — | — |
| 1978 | 85° | 50° | 67° | — | — |
| 1977coldest | 67° | 40° | 53° | — | — |
| 1976 | 85° | 45° | 65° | — | — |
| 1975 | 80° | 46° | 63° | — | — |
| 1974 | 66° | 49° | 57° | — | — |
| 1973 | 82° | 52° | 67° | — | — |
| 1972 | 73° | 54° | 63° | — | — |
| 1971 | 81° | 47° | 64° | — | — |
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
Rancho Cucamonga, CA has no months that meet our "pleasant" threshold — every season has tradeoffs.