June is one of the warmer months of the year in Rancho Cucamonga, with average highs near 30.7°C and lows around 14°C (mean 22.4°C). It is one of the drier months, averaging 2 mm of rainfall and 47% relative humidity across the period.
June is one of the warmer months of the year in Rancho Cucamonga. Across 45 years of records, the warmest June in Rancho Cucamonga was 1981 — when the month averaged 26.2°C — while the coldest was 1998 at 18.4°C. Typical June days reach 30.7°C with nights near 14°C. The long-term June temperature trend is broadly flat.
June is one of the drier months in Rancho Cucamonga, averaging 2 mm of rainfall. The wettest June on record was 1993 with 27 mm, while the driest were 2014, 2017 and 2018, among others at 0 mm.
Relative humidity in Rancho Cucamonga during June averages 47%. The most humid June was 1998 at 69%, and the least humid was 1981 at 27%.
June receives about 8.1 kWh/m²/day of solar energy in Rancho Cucamonga. The sunniest June was 2012 at 8.8 kWh/m²/day, and the cloudiest was 1984 at 6.6.
Average wind speed in Rancho Cucamonga during June is 1.9 m/s. The windiest June was 1981 at 2.2 m/s, while the calmest were 2006 and 2019 at 1.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 22.7°C | 21.4°C | 22.5°C | 22.6°C | 22.7°C | 0°C |
| Avg High | 31.5°C | 29.4°C | 30.8°C | 31.2°C | 30.8°C | -0.7°C |
| Avg Low | 14.0°C | 13.3°C | 14.2°C | 14.0°C | 14.7°C | +0.7°C |
| Avg Rain | 1 mm | 7 mm | 1 mm | 1 mm | 1 mm | 0 mm |
June temperatures in Rancho Cucamonga have stayed relatively stable across the record.
June has ranged from a record low of 5.6°C (1988) to a record high of 44.8°C (2016).
Rainfall in June is one of the drier months, averaging 2 mm, with a wettest year of 27 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0°C per decade while lows rose 0.2°C per decade, narrowing the gap between day and night.
One of the best times to visit Rancho Cucamonga
June is one of the best times to visit Rancho Cucamonga. Expect days averaging 30.7°C and nights around 14°C (mean 22.4°C) — warmer than Rancho Cucamonga's yearly average — with low rainfall (2 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 31.3°C | 23.0°C | 14.8°C | 37.3°C | 9.7°C | 0 mm | 49% | 1.8 m/s | 8.3 |
| 2024 | 31.1°C | 23.0°C | 14.9°C | 37.3°C | 10.8°C | 1 mm | 52% | 1.8 m/s | 8.4 |
| 2023 | 25.5°C | 18.6°C | 11.8°C | 36.4°C | 9.7°C | 2 mm | 68% | 1.9 m/s | 7.9 |
| 2022 | 33.7°C | 25.0°C | 16.2°C | 39.8°C | 10.3°C | 2 mm | 38% | 1.9 m/s | 8.4 |
| 2021 | 33.4°C | 24.9°C | 16.4°C | 42.1°C | 8.2°C | 1 mm | 37% | 1.8 m/s | 8.2 |
| 2020 | 29.9°C | 21.9°C | 13.9°C | 37.9°C | 8.9°C | 1 mm | 51% | 2 m/s | 8.2 |
| 2019 | 29.7°C | 21.6°C | 13.6°C | 37.6°C | 10.3°C | 1 mm | 56% | 1.7 m/s | 8.2 |
| 2018 | 31.4°C | 22.6°C | 13.7°C | 36.6°C | 9.3°C | 0 mm | 44% | 1.8 m/s | 8.6 |
| 2017 | 32.6°C | 24.1°C | 15.6°C | 40.9°C | 8.3°C | 0 mm | 44% | 1.8 m/s | 8.6 |
| 2016 | 33.4°C | 24.9°C | 16.4°C | 44.8°C | 9.8°C | 0 mm | 38% | 1.8 m/s | 8.3 |
| 2015 | 32.6°C | 24.5°C | 16.4°C | 37.3°C | 10.7°C | 3 mm | 43% | 1.9 m/s | 8 |
| 2014 | 32.0°C | 22.8°C | 13.5°C | 36.3°C | 9.9°C | 0 mm | 43% | 1.9 m/s | 8.7 |
| 2013 | 32.0°C | 23.0°C | 14.1°C | 42.6°C | 10.7°C | 0 mm | 43% | 1.8 m/s | 8.4 |
| 2012 | 30.8°C | 21.7°C | 12.6°C | 35.3°C | 8.1°C | 0 mm | 41% | 1.8 m/s | 8.8 |
| 2011 | 28.0°C | 19.9°C | 11.8°C | 35.4°C | 6.6°C | 0 mm | 53% | 1.9 m/s | 8.5 |
| 2010 | 29.5°C | 21.0°C | 12.5°C | 34.3°C | 9.3°C | 0 mm | 54% | 1.8 m/s | 8.5 |
| 2009 | 27.3°C | 20.2°C | 13.2°C | 39.2°C | 10.1°C | 2 mm | 57% | 2 m/s | 7.4 |
| 2008 | 33.4°C | 24.3°C | 15.2°C | 41.7°C | 7.8°C | 0 mm | 38% | 1.8 m/s | 8.6 |
| 2007 | 31.6°C | 22.8°C | 14.1°C | 37.0°C | 7.2°C | 0 mm | 40% | 1.8 m/s | 8.6 |
| 2006 | 32.8°C | 24.9°C | 17.0°C | 40.3°C | 11.2°C | 2 mm | 42% | 1.7 m/s | 8 |
| 2005 | 27.7°C | 19.9°C | 12.1°C | 33.4°C | 7.2°C | 0 mm | 57% | 1.9 m/s | 8.5 |
| 2004 | 30.1°C | 21.9°C | 13.7°C | 34.3°C | 9.3°C | 0 mm | 51% | 1.9 m/s | 8.5 |
| 2003 | 29.5°C | 21.5°C | 13.5°C | 38.2°C | 10.0°C | 1 mm | 56% | 1.9 m/s | 8.1 |
| 2002 | 31.6°C | 22.6°C | 13.6°C | 39.8°C | 9.6°C | 0 mm | 44% | 1.9 m/s | 8.7 |
| 2001 | 32.2°C | 23.7°C | 15.2°C | 36.3°C | 8.7°C | 1 mm | 42% | 1.9 m/s | 8.6 |
| 2000 | 31.6°C | 23.1°C | 14.6°C | 40.1°C | 8.9°C | 4 mm | 48% | 1.9 m/s | 8.2 |
| 1999 | 28.9°C | 20.7°C | 12.5°C | 35.4°C | 6.0°C | 14 mm | 49% | 1.9 m/s | 8.4 |
| 1998 ❄️ | 25.2°C | 18.4°C | 11.5°C | 33.2°C | 8.3°C | 3 mm | 69% | 2 m/s | 8.1 |
| 1997 | 29.2°C | 21.4°C | 13.5°C | 34.5°C | 11.0°C | 3 mm | 58% | 2.1 m/s | 8.4 |
| 1996 | 31.1°C | 22.6°C | 14.1°C | 38.3°C | 8.9°C | 0 mm | 47% | 1.9 m/s | 8.6 |
| 1995 | 27.7°C | 19.9°C | 12.1°C | 37.0°C | 7.5°C | 17 mm | 57% | 1.9 m/s | 7.2 |
| 1994 | 32.4°C | 24.2°C | 16.0°C | 41.4°C | 10.0°C | 0 mm | 43% | 1.8 m/s | 7.9 |
| 1993 🌧️ | 30.2°C | 22.1°C | 14.0°C | 38.9°C | 7.3°C | 27 mm | 51% | 1.8 m/s | 8.2 |
| 1992 | 29.1°C | 21.0°C | 12.9°C | 34.5°C | 8.5°C | 0 mm | 53% | 2 m/s | 7.1 |
| 1991 | 27.7°C | 19.5°C | 11.3°C | 34.7°C | 7.1°C | 0 mm | 54% | 1.9 m/s | 6.9 |
| 1990 | 32.7°C | 24.0°C | 15.2°C | 42.2°C | 8.1°C | 4 mm | 39% | 2 m/s | 7.9 |
| 1989 | 31.5°C | 22.6°C | 13.7°C | 39.2°C | 9.3°C | 0 mm | 43% | 2.1 m/s | 8 |
| 1988 | 29.8°C | 21.3°C | 12.8°C | 36.8°C | 5.6°C | 0 mm | 46% | 1.9 m/s | 6.8 |
| 1987 | 32.4°C | 23.7°C | 15.1°C | 37.3°C | 9.2°C | 3 mm | 39% | 1.8 m/s | 7.8 |
| 1986 | 32.4°C | 23.6°C | 14.9°C | 38.8°C | 10.4°C | 0 mm | 40% | 1.8 m/s | 7.8 |
| 1985 | 33.4°C | 24.3°C | 15.2°C | 38.9°C | 8.4°C | 2 mm | 35% | 1.9 m/s | 7.9 |
| 1984 | 31.9°C | 23.1°C | 14.2°C | 38.2°C | 9.6°C | 2 mm | 39% | 2 m/s | 6.6 |
| 1983 | 28.2°C | 20.2°C | 12.2°C | 34.3°C | 8.6°C | 0 mm | 56% | 1.8 m/s | — |
| 1982 | 27.9°C | 19.6°C | 11.2°C | 33.1°C | 7.3°C | 2 mm | 54% | 2 m/s | — |
| 1981 🔥 | 35.6°C | 26.2°C | 16.8°C | 39.0°C | 10.8°C | 0 mm | 27% | 2.2 m/s | — |
Actual recorded June data for each year, 1981–2025 — sourced from NASA POWER.
The average high in June is around 30.7°C with lows near 14°C (mean 22.4°C), based on 45 years of NASA POWER data.
June averages 2 mm of rainfall in Rancho Cucamonga, one of the drier months. The wettest on record was 27 mm in 1993.
The hottest June reached 44.8°C in 2016. The coldest dipped to 5.6°C in 1988.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average June temperatures have risen by about 0.2°C — but days and nights have moved in opposite directions. Overnight lows rose from 13.9°C to 14.8°C while daytime highs eased from 31.4°C to 31°C, narrowing the gap between day and night.
June is one of the warmer months of the year in Rancho Cucamonga and one of the drier months, so plan for around 30.7°C daytime highs and 14°C at night.
Not quite — June is the 9th coolest month in Rancho Cucamonga, averaging 22.4°C.
For June in Rancho Cucamonga, pack light, breathable clothing and sun protection, with typical highs of 30.7°C and lows of 14°C.
Relative humidity in June averages 47% — relatively dry.
Average wind speed in June is 1.9 m/s. The windiest June on record averaged 2.2 m/s (1981).
The wettest June on record was 1993 with 27 mm. On average, June sees 2 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Rancho Cucamonga behaves each June, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for June specifically, along with year-by-year records and how the month has changed over the decades.
