March is one of the cooler months of the year in Brentwood, with average highs near 15°C and lows around 3.4°C (mean 9.2°C). It is a relatively wet time of year, averaging 125 mm of rainfall and 82% relative humidity across the period.
March is one of the cooler months of the year in Brentwood. Across 45 years of records, the warmest March in Brentwood was 2012 — when the month averaged 15.1°C — while the coldest was 1996 at 5.4°C. Typical March days reach 15°C with nights near 3.4°C. The long-term trend is warming, about 0.4°C per decade.
March is a relatively wet time of year in Brentwood, averaging 125 mm of rainfall. The wettest March on record was 2021 with 262 mm, while the driest was 1987 at 53 mm.
Relative humidity in Brentwood during March averages 82%. The most humid March was 2020 at 88%, and the least humid was 1981 at 75%.
March receives about 4.1 kWh/m²/day of solar energy in Brentwood. The sunniest March was 1986 at 5.1 kWh/m²/day, and the cloudiest was 2020 at 3.2.
Average wind speed in Brentwood during March is 2.2 m/s. The windiest March was 2008 at 2.6 m/s, while the calmest was 2015 at 1.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 8.7°C | 8.4°C | 9.5°C | 9.1°C | 10.9°C | +2.2°C |
| Avg High | 14.7°C | 14.0°C | 15.3°C | 14.7°C | 16.8°C | +2.1°C |
| Avg Low | 2.8°C | 2.7°C | 3.7°C | 3.4°C | 4.9°C | +2.1°C |
| Avg Rain | 105 mm | 148 mm | 107 mm | 111 mm | 167 mm | +62 mm |
March temperatures in Brentwood have risen by about 2.2°C between 1981–1985 and 2021–2025.
March has ranged from a record low of -14.7°C (2014) to a record high of 27.5°C (2007).
Rainfall in March is a relatively wet time of year, averaging 125 mm, with a wettest year of 262 mm.
A quieter season to visit Brentwood
If your dates are flexible, the more temperate months of September and June tend to be the most comfortable for visiting Brentwood. That said, March — with days averaging 15°C and nights around 3.4°C (mean 9.2°C) and higher rainfall (125 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 | 17.4°C | 11.0°C | 4.5°C | 24.9°C | -5.2°C | 162 mm | 77% | 2.4 m/s | 4.6 |
| 2024 | 17.8°C | 11.5°C | 5.1°C | 24.1°C | -3.5°C | 106 mm | 79% | 1.9 m/s | 4.4 |
| 2023 | 15.5°C | 9.4°C | 3.4°C | 24.0°C | -6.2°C | 139 mm | 79% | 2.2 m/s | 4.3 |
| 2022 | 16.2°C | 9.9°C | 3.7°C | 23.6°C | -6.7°C | 119 mm | 82% | 2.2 m/s | 4.6 |
| 2021 🌧️ | 17.2°C | 11.6°C | 5.9°C | 22.6°C | -0.5°C | 262 mm | 82% | 2.1 m/s | 4 |
| 2020 | 16.7°C | 11.8°C | 6.9°C | 25.2°C | -3.9°C | 216 mm | 88% | 2.1 m/s | 3.2 |
| 2019 | 13.1°C | 7.3°C | 1.5°C | 22.8°C | -7.6°C | 85 mm | 81% | 2.1 m/s | 4.4 |
| 2018 | 13.8°C | 8.4°C | 3.1°C | 22.7°C | -4.2°C | 120 mm | 85% | 2.2 m/s | 3.9 |
| 2017 | 16.3°C | 10.1°C | 4.0°C | 24.8°C | -6.5°C | 131 mm | 78% | 2.3 m/s | 4.3 |
| 2016 | 17.1°C | 11.7°C | 6.2°C | 25.4°C | -3.7°C | 117 mm | 83% | 2.3 m/s | 4.2 |
| 2015 | 14.6°C | 8.7°C | 2.8°C | 22.9°C | -14.7°C | 127 mm | 85% | 1.8 m/s | 3.7 |
| 2014 | 12.3°C | 6.0°C | -0.4°C | 22.1°C | -14.7°C | 95 mm | 83% | 2.1 m/s | 4.1 |
| 2013 | 11.3°C | 5.8°C | 0.2°C | 20.8°C | -6.0°C | 118 mm | 82% | 2.1 m/s | 3.7 |
| 2012 🔥 | 20.6°C | 15.1°C | 9.5°C | 26.1°C | -1.6°C | 96 mm | 84% | 2.1 m/s | 4.5 |
| 2011 | 14.9°C | 9.6°C | 4.3°C | 24.8°C | -2.2°C | 123 mm | 85% | 2.2 m/s | 3.4 |
| 2010 | 13.5°C | 8.2°C | 3.0°C | 22.5°C | -4.0°C | 98 mm | 84% | 2 m/s | 3.7 |
| 2009 | 15.3°C | 10.0°C | 4.7°C | 22.9°C | -7.0°C | 105 mm | 82% | 2.3 m/s | 3.6 |
| 2008 | 14.9°C | 9.0°C | 3.1°C | 20.6°C | -4.8°C | 159 mm | 83% | 2.6 m/s | 4.2 |
| 2007 | 19.6°C | 13.3°C | 7.1°C | 27.5°C | -5.7°C | 60 mm | 79% | 2.1 m/s | 4.7 |
| 2006 | 14.8°C | 9.1°C | 3.3°C | 25.6°C | -3.6°C | 87 mm | 79% | 2.3 m/s | 4.4 |
| 2005 | 13.3°C | 7.7°C | 2.1°C | 22.1°C | -4.9°C | 73 mm | 83% | 2.1 m/s | 4.2 |
| 2004 | 16.2°C | 10.7°C | 5.2°C | 24.3°C | -3.7°C | 126 mm | 80% | 2.1 m/s | 4.5 |
| 2003 | 15.5°C | 9.7°C | 3.9°C | 21.9°C | -5.4°C | 59 mm | 84% | 1.9 m/s | 4 |
| 2002 | 14.6°C | 8.6°C | 2.6°C | 23.7°C | -7.5°C | 232 mm | 82% | 2.4 m/s | 3.9 |
| 2001 | 11.6°C | 6.0°C | 0.4°C | 18.1°C | -5.8°C | 69 mm | 81% | 1.9 m/s | 4 |
| 2000 | 17.5°C | 10.9°C | 4.3°C | 25.2°C | -3.4°C | 102 mm | 75% | 2 m/s | 4.5 |
| 1999 | 11.9°C | 6.0°C | 0.1°C | 18.7°C | -5.8°C | 112 mm | 81% | 2.1 m/s | 4.2 |
| 1998 | 13.7°C | 8.5°C | 3.4°C | 25.2°C | -7.3°C | 113 mm | 83% | 2.5 m/s | 3.6 |
| 1997 | 16.8°C | 10.7°C | 4.7°C | 24.3°C | -5.3°C | 224 mm | 83% | 2.2 m/s | 4.3 |
| 1996 ❄️ | 11.1°C | 5.4°C | -0.2°C | 20.2°C | -12.5°C | 155 mm | 81% | 2.2 m/s | 4.2 |
| 1995 | 16.4°C | 10.0°C | 3.6°C | 24.6°C | -8.5°C | 117 mm | 81% | 2.1 m/s | 4.4 |
| 1994 | 13.5°C | 7.7°C | 1.9°C | 21.4°C | -6.7°C | 250 mm | 85% | 2.1 m/s | 4.2 |
| 1993 | 11.9°C | 7.0°C | 2.1°C | 24.2°C | -7.2°C | 114 mm | 83% | 2.1 m/s | 3.4 |
| 1992 | 14.8°C | 8.8°C | 2.8°C | 21.9°C | -6.2°C | 124 mm | 83% | 2.1 m/s | 4.2 |
| 1991 | 14.7°C | 9.4°C | 4.1°C | 23.0°C | -4.1°C | 161 mm | 84% | 2.5 m/s | 3.9 |
| 1990 | 15.4°C | 10.1°C | 4.9°C | 24.3°C | -5.6°C | 114 mm | 84% | 2 m/s | 3.6 |
| 1989 | 15.1°C | 9.3°C | 3.6°C | 22.6°C | -4.4°C | 186 mm | 87% | 2.2 m/s | 4 |
| 1988 | 14.5°C | 8.5°C | 2.4°C | 22.9°C | -5.7°C | 103 mm | 82% | 2.1 m/s | 4.4 |
| 1987 | 14.9°C | 9.2°C | 3.4°C | 22.1°C | -4.7°C | 53 mm | 82% | 2 m/s | 4.5 |
| 1986 | 15.9°C | 9.1°C | 2.3°C | 26.0°C | -7.0°C | 87 mm | 75% | 2.1 m/s | 5.1 |
| 1985 | 16.0°C | 10.2°C | 4.3°C | 24.5°C | -4.4°C | 79 mm | 82% | 2.4 m/s | 4.1 |
| 1984 | 12.4°C | 6.8°C | 1.2°C | 23.0°C | -6.5°C | 154 mm | 85% | 2.1 m/s | 3.8 |
| 1983 | 13.8°C | 8.4°C | 3.0°C | 21.7°C | -4.9°C | 93 mm | 83% | 2.2 m/s | — |
| 1982 | 15.8°C | 10.1°C | 4.5°C | 26.2°C | -6.4°C | 93 mm | 84% | 2.1 m/s | — |
| 1981 | 13.6°C | 7.1°C | 0.6°C | 24.9°C | -5.0°C | 99 mm | 75% | 2.1 m/s | — |
Actual recorded March data for each year, 1981–2025 — sourced from NASA POWER.
The average high in March is around 15°C with lows near 3.4°C (mean 9.2°C), based on 45 years of NASA POWER data.
March averages 125 mm of rainfall in Brentwood, a relatively wet time of year. The wettest on record was 262 mm in 2021.
The hottest March reached 27.5°C in 2007. The coldest dipped to -14.7°C in 2014.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average March temperatures have risen by about 2.2°C. Daytime highs moved from 14.3°C to 16.8°C and overnight lows from 2.7°C to 4.5°C over the same span.
March is one of the cooler months of the year in Brentwood and a relatively wet time of year, so plan for around 15°C daytime highs and 3.4°C at night.
Not quite — March is the 4th coolest month in Brentwood, averaging 9.2°C.
For March in Brentwood, pack warm layers and a jacket for chilly mornings, with typical highs of 15°C and lows of 3.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in March averages 82% — quite humid.
Average wind speed in March is 2.2 m/s. The windiest March on record averaged 2.6 m/s (2008).
The wettest March on record was 2021 with 262 mm. On average, March sees 125 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 Brentwood 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.
