March is one of the cooler months of the year in Rancho Cucamonga, with average highs near 20.2°C and lows around 6.5°C (mean 13.4°C). It is a relatively wet time of year, averaging 52 mm of rainfall and 61% relative humidity across the period.
March is one of the cooler months of the year in Rancho Cucamonga. Across 45 years of records, the warmest Marchs in Rancho Cucamonga were 2004 and 2015 — when the month averaged 17.9°C — while the coldest was 1991 at 9.3°C. Typical March days reach 20.2°C with nights near 6.5°C. The long-term trend is warming, about 0.2°C per decade.
March is a relatively wet time of year in Rancho Cucamonga, averaging 52 mm of rainfall. The wettest March on record was 1995 with 164 mm, while the driest was 1997 at 0 mm.
Relative humidity in Rancho Cucamonga during March averages 61%. The most humid March was 1983 at 78%, and the least humid was 1988 at 44%.
March receives about 5.5 kWh/m²/day of solar energy in Rancho Cucamonga. The sunniest March was 2008 at 6.1 kWh/m²/day, and the cloudiest was 1992 at 4.5.
Average wind speed in Rancho Cucamonga during March is 1.9 m/s. The windiest March was 1991 at 2.4 m/s, while the calmest was 2001 at 1.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 12.9°C | 12.9°C | 13.8°C | 14.4°C | 12.5°C | -0.4°C |
| Avg High | 20.0°C | 19.4°C | 21.0°C | 21.4°C | 18.7°C | -1.3°C |
| Avg Low | 5.8°C | 6.3°C | 6.6°C | 7.4°C | 6.3°C | +0.5°C |
| Avg Rain | 62 mm | 72 mm | 27 mm | 32 mm | 75 mm | +14 mm |
March temperatures in Rancho Cucamonga have risen by about 0.6°C between 1981–1985 and 2021–2025.
March has ranged from a record low of -2.6°C (1991) to a record high of 33°C (1988).
Rainfall in March is a relatively wet time of year, averaging 52 mm, with a wettest year of 164 mm.
A quieter season to visit Rancho Cucamonga
If your dates are flexible, the more temperate months of June and October tend to be the most comfortable for visiting Rancho Cucamonga. That said, March — with days averaging 20.2°C and nights around 6.5°C (mean 13.4°C) and moderate rainfall (52 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 19.6°C | 13.2°C | 6.7°C | 31.8°C | 1.2°C | 57 mm | 67% | 2.1 m/s | 5.4 |
| 2024 | 17.5°C | 12.2°C | 7.0°C | 22.9°C | 3.4°C | 82 mm | 76% | 2 m/s | 5.2 |
| 2023 | 15.2°C | 10.1°C | 4.9°C | 20.5°C | -1.1°C | 154 mm | 77% | 2.1 m/s | 5 |
| 2022 | 22.8°C | 15.3°C | 7.8°C | 30.4°C | 0.5°C | 25 mm | 52% | 2 m/s | 5.8 |
| 2021 | 19.5°C | 12.2°C | 5.0°C | 29.7°C | 0.3°C | 30 mm | 57% | 2 m/s | 5.8 |
| 2020 | 17.4°C | 12.0°C | 6.6°C | 25.4°C | 0.8°C | 102 mm | 72% | 2 m/s | 5 |
| 2019 | 18.2°C | 12.5°C | 6.8°C | 25.5°C | 2.4°C | 56 mm | 73% | 1.9 m/s | 5.5 |
| 2018 | 20.0°C | 13.7°C | 7.4°C | 30.0°C | 1.0°C | 63 mm | 58% | 1.9 m/s | 5.3 |
| 2017 | 22.8°C | 15.7°C | 8.6°C | 30.0°C | -0.4°C | 6 mm | 59% | 1.7 m/s | 5.9 |
| 2016 | 22.5°C | 15.3°C | 8.0°C | 28.7°C | 2.4°C | 32 mm | 57% | 1.9 m/s | 5.6 |
| 2015 | 25.5°C | 17.9°C | 10.2°C | 31.5°C | 3.3°C | 14 mm | 45% | 1.6 m/s | 5.9 |
| 2014 | 22.8°C | 15.5°C | 8.1°C | 30.3°C | 5.1°C | 17 mm | 54% | 1.8 m/s | 5.8 |
| 2013 | 23.6°C | 15.7°C | 7.8°C | 32.0°C | 2.8°C | 17 mm | 51% | 1.6 m/s | 5.8 |
| 2012 | 20.1°C | 12.6°C | 5.1°C | 29.0°C | -1.2°C | 48 mm | 58% | 2 m/s | 5.8 |
| 2011 | 19.2°C | 12.7°C | 6.2°C | 31.6°C | 1.6°C | 58 mm | 68% | 2 m/s | 5.3 |
| 2010 | 19.3°C | 12.4°C | 5.5°C | 25.8°C | 0.1°C | 12 mm | 61% | 1.9 m/s | 5.8 |
| 2009 | 20.5°C | 13.1°C | 5.8°C | 28.5°C | 0.9°C | 5 mm | 57% | 1.8 m/s | 5.9 |
| 2008 | 21.5°C | 13.7°C | 6.0°C | 27.3°C | 0.2°C | 4 mm | 54% | 1.8 m/s | 6.1 |
| 2007 | 24.1°C | 16.0°C | 7.8°C | 32.6°C | -1.3°C | 6 mm | 44% | 1.8 m/s | 5.9 |
| 2006 | 16.0°C | 10.2°C | 4.5°C | 25.3°C | -1.1°C | 58 mm | 67% | 1.9 m/s | 5 |
| 2005 | 19.0°C | 12.9°C | 6.9°C | 28.3°C | 2.5°C | 32 mm | 70% | 1.9 m/s | 5.4 |
| 2004 🔥 | 25.8°C | 17.9°C | 9.9°C | 31.8°C | 4.1°C | 16 mm | 50% | 1.7 m/s | 5.9 |
| 2003 | 21.1°C | 13.9°C | 6.7°C | 28.1°C | 1.1°C | 62 mm | 59% | 1.9 m/s | 5.8 |
| 2002 | 20.7°C | 13.0°C | 5.3°C | 29.8°C | 0.7°C | 16 mm | 49% | 2 m/s | 5.8 |
| 2001 | 21.0°C | 14.1°C | 7.2°C | 28.8°C | 2.8°C | 25 mm | 67% | 1.5 m/s | 5.4 |
| 2000 | 19.9°C | 13.1°C | 6.3°C | 27.0°C | 1.7°C | 43 mm | 61% | 1.9 m/s | 5.6 |
| 1999 | 18.4°C | 11.6°C | 4.8°C | 27.0°C | -0.3°C | 24 mm | 66% | 1.9 m/s | 5.2 |
| 1998 | 18.3°C | 12.3°C | 6.4°C | 25.8°C | 0.1°C | 85 mm | 71% | 1.9 m/s | 5.3 |
| 1997 | 24.0°C | 15.8°C | 7.7°C | 31.2°C | -0.6°C | 0 mm | 49% | 1.7 m/s | 5.7 |
| 1996 | 20.5°C | 13.4°C | 6.4°C | 28.2°C | 1.1°C | 46 mm | 62% | 1.9 m/s | 5.5 |
| 1995 🌧️ | 18.1°C | 12.4°C | 6.6°C | 25.7°C | 0.1°C | 164 mm | 69% | 2 m/s | 5.2 |
| 1994 | 21.5°C | 14.5°C | 7.4°C | 27.8°C | 1.4°C | 60 mm | 59% | 1.7 m/s | 5.4 |
| 1993 | 20.4°C | 13.9°C | 7.4°C | 26.6°C | 1.5°C | 38 mm | 68% | 1.7 m/s | 5.3 |
| 1992 | 17.1°C | 12.1°C | 7.1°C | 23.3°C | 4.3°C | 138 mm | 78% | 1.7 m/s | 4.5 |
| 1991 ❄️ | 15.6°C | 9.3°C | 2.9°C | 23.3°C | -2.6°C | 158 mm | 71% | 2.4 m/s | 5 |
| 1990 | 20.5°C | 13.6°C | 6.6°C | 28.8°C | -1.6°C | 12 mm | 56% | 1.8 m/s | 5.3 |
| 1989 | 22.5°C | 14.6°C | 6.7°C | 29.6°C | -0.6°C | 27 mm | 56% | 2.1 m/s | 5.4 |
| 1988 | 23.1°C | 14.7°C | 6.2°C | 33.0°C | 1.2°C | 7 mm | 44% | 2.2 m/s | 5.8 |
| 1987 | 19.8°C | 12.2°C | 4.6°C | 27.2°C | -0.6°C | 39 mm | 56% | 2.1 m/s | 5.1 |
| 1986 | 21.3°C | 14.7°C | 8.1°C | 29.2°C | 1.9°C | 99 mm | 64% | 1.8 m/s | 4.9 |
| 1985 | 18.4°C | 11.2°C | 4.0°C | 26.1°C | -1.5°C | 27 mm | 59% | 2.1 m/s | 5.3 |
| 1984 | 22.7°C | 14.7°C | 6.7°C | 27.8°C | 3.2°C | 5 mm | 45% | 2.2 m/s | 4.9 |
| 1983 | 16.9°C | 11.3°C | 5.6°C | 26.0°C | 1.4°C | 154 mm | 78% | 2.2 m/s | — |
| 1982 | 16.8°C | 11.0°C | 5.1°C | 22.5°C | -0.4°C | 136 mm | 66% | 2.1 m/s | — |
| 1981 | 18.8°C | 12.0°C | 5.1°C | 26.7°C | 2.5°C | 59 mm | 64% | 1.9 m/s | — |
Actual recorded March data for each year, 1981–2025 — sourced from NASA POWER.
The average high in March is around 20.2°C with lows near 6.5°C (mean 13.4°C), based on 45 years of NASA POWER data.
March averages 52 mm of rainfall in Rancho Cucamonga, a relatively wet time of year. The wettest on record was 164 mm in 1995.
The hottest March reached 33°C in 1988. The coldest dipped to -2.6°C in 1991.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average March temperatures have risen by about 0.6°C. Daytime highs moved from 18.7°C to 18.9°C and overnight lows from 5.3°C to 6.3°C over the same span.
March is one of the cooler months of the year in Rancho Cucamonga and a relatively wet time of year, so plan for around 20.2°C daytime highs and 6.5°C at night.
Not quite — March is the 4th coolest month in Rancho Cucamonga, averaging 13.4°C.
For March in Rancho Cucamonga, pack warm layers and a jacket for chilly mornings, with typical highs of 20.2°C and lows of 6.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in March averages 61% — moderately humid.
Average wind speed in March is 1.9 m/s. The windiest March on record averaged 2.4 m/s (1991).
The wettest March on record was 1995 with 164 mm. On average, March sees 52 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 March, 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 March specifically, along with year-by-year records and how the month has changed over the decades.
