Weather on August 28
Rancho Cucamonga, CA
55 Years of Data
About This Date
August 28th in Rancho Cucamonga, CA typically brings hot summer weather, with average highs around 96°F and lows near 64°F — a 32°F daily swing. Over 43 years of records, the warmest August 28th was in 2026 (91°F average), while the coldest was 1973 (66°F) — a 25°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 3.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.7°F warmer on this date compared to 20-30 years ago.
Planning for August 28th in Rancho Cucamonga, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026warmest | 104° | 77° | 91° | — | — |
| 2025 | 88° | 72° | 80° | — | — |
| 2024 | 91° | 62° | 77° | — | — |
| 2023 | 105° | 71° | 88° | — | — |
| 2022 | 88° | 66° | 77° | — | — |
| 2021 | 103° | 70° | 86° | — | — |
| 2020 | 99° | 69° | 84° | — | — |
| 2019 | 92° | 67° | 79° | — | — |
| 2018 | 88° | 62° | 75° | — | — |
| 2017 | 110° | 71° | 90° | — | — |
| 2016 | 95° | 62° | 79° | — | — |
| 2015 | 106° | 74° | 90° | — | — |
| 2014 | 100° | 69° | 85° | — | — |
| 2013 | 100° | 74° | 87° | — | — |
| 2012 | 103° | 69° | 86° | — | — |
| 2011 | 101° | 71° | 86° | — | — |
| 2010 | 80° | 59° | 70° | — | — |
| 2009 | 106° | 71° | 88° | — | — |
| 2008 | 91° | 65° | 78° | — | — |
| 2007 | 100° | 71° | 86° | — | — |
| 2006 | 101° | 66° | 83° | — | — |
| 2005 | 101° | 70° | 85° | — | — |
| 2004 | 91° | 61° | 76° | — | — |
| 2003 | 95° | 67° | 81° | — | — |
| 2002 | 88° | 59° | 73° | — | — |
| 2001 | 92° | 61° | 76° | — | — |
| 2000 | 83° | 64° | 73° | — | — |
| 1999 | 98° | 64° | 81° | — | — |
| 1998 | 102° | 67° | 84° | — | — |
| 1984 | 104° | 66° | 85° | — | — |
| 1983 | 101° | 61° | 81° | — | — |
| 1982 | 91° | 65° | 78° | — | — |
| 1981 | 108° | 70° | 89° | — | — |
| 1980 | 92° | 53° | 72° | — | — |
| 1979 | 89° | 59° | 74° | — | — |
| 1978 | 92° | 57° | 74° | — | — |
| 1977 | 91° | 56° | 73° | — | — |
| 1976 | 101° | 61° | 81° | — | — |
| 1975 | 87° | 51° | 69° | — | — |
| 1974 | 90° | 52° | 71° | — | — |
| 1973coldest | 83° | 49° | 66° | — | — |
| 1972 | 92° | 56° | 74° | — | — |
| 1971 | 99° | 58° | 78° | — | — |
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 August 28th
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.
August 28th outlook →