March is one of the warmer months of the year in Blenheim, with average highs near 19.5°C and lows around 9.8°C (mean 14.7°C). It is about average for rainfall, averaging 63 mm of rainfall and 77% relative humidity across the period.
March is one of the warmer months of the year in Blenheim. Across 45 years of records, the warmest March in Blenheim was 1990 — when the month averaged 16.5°C — while the coldest was 1992 at 12.5°C. Typical March days reach 19.5°C with nights near 9.8°C. The long-term March temperature trend is broadly flat.
March is about average for rainfall in Blenheim, averaging 63 mm of rainfall. The wettest March on record was 1987 with 133 mm, while the driest was 1982 at 8 mm.
Relative humidity in Blenheim during March averages 77%. The most humid March was 2018 at 85%, and the least humid was 2010 at 70%.
March receives about 4.6 kWh/m²/day of solar energy in Blenheim. The sunniest March was 2025 at 5 kWh/m²/day, and the cloudiest was 1984 at 3.9.
Average wind speed in Blenheim during March is 2.2 m/s. The windiest Marchs were 2006 and 2012 at 2.7 m/s, while the calmest was 1991 at 1.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 14.6°C | 14.3°C | 14.9°C | 14.9°C | 14.5°C | -0.1°C |
| Avg High | 19.4°C | 19.0°C | 20.0°C | 19.9°C | 19.3°C | -0.1°C |
| Avg Low | 9.8°C | 9.5°C | 9.9°C | 10.0°C | 9.6°C | -0.2°C |
| Avg Rain | 71 mm | 70 mm | 40 mm | 71 mm | 68 mm | -3 mm |
March temperatures in Blenheim have fallen by about 0.7°C between 1981–1985 and 2021–2025.
March has ranged from a record low of 2.5°C (1983) to a record high of 28.2°C (2000).
Rainfall in March is about average for rainfall, averaging 63 mm, with a wettest year of 133 mm.
One of the best times to visit Blenheim
March is one of the best times to visit Blenheim. Expect days averaging 19.5°C and nights around 9.8°C (mean 14.7°C) — warmer than Blenheim's yearly average — with moderate rainfall (63 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 | 20.5°C | 15.4°C | 10.2°C | 27.2°C | 5.9°C | 67 mm | 78% | 1.9 m/s | 5 |
| 2024 | 19.3°C | 13.8°C | 8.3°C | 24.9°C | 3.9°C | 33 mm | 73% | 2.3 m/s | 4.8 |
| 2023 | 19.0°C | 14.3°C | 9.6°C | 23.8°C | 4.0°C | 83 mm | 80% | 2.3 m/s | 4.8 |
| 2022 | 18.5°C | 14.5°C | 10.5°C | 23.1°C | 6.3°C | 54 mm | 83% | 2.1 m/s | 4.9 |
| 2021 | 19.4°C | 14.7°C | 10.1°C | 22.1°C | 6.2°C | 96 mm | 78% | 2.2 m/s | 4.4 |
| 2020 | 18.9°C | 14.0°C | 9.0°C | 23.5°C | 4.9°C | 77 mm | 76% | 2.4 m/s | 4.6 |
| 2019 | 20.8°C | 16.2°C | 11.6°C | 26.5°C | 7.8°C | 73 mm | 80% | 2.1 m/s | 4.3 |
| 2018 | 18.4°C | 14.5°C | 10.6°C | 22.2°C | 7.1°C | 83 mm | 85% | 2.4 m/s | 4.3 |
| 2017 | 19.4°C | 14.9°C | 10.4°C | 26.1°C | 7.9°C | 99 mm | 80% | 2 m/s | 4.3 |
| 2016 | 20.3°C | 15.4°C | 10.4°C | 28.0°C | 7.0°C | 92 mm | 77% | 2.1 m/s | 4.7 |
| 2015 | 20.5°C | 15.4°C | 10.3°C | 26.4°C | 5.1°C | 57 mm | 76% | 2.1 m/s | 4.5 |
| 2014 | 20.1°C | 14.7°C | 9.3°C | 23.1°C | 4.6°C | 65 mm | 75% | 2.1 m/s | 4.8 |
| 2013 | 21.0°C | 15.9°C | 10.9°C | 25.9°C | 7.5°C | 68 mm | 76% | 2.1 m/s | 4.6 |
| 2012 | 17.1°C | 12.7°C | 8.4°C | 22.0°C | 4.6°C | 86 mm | 80% | 2.7 m/s | 4.3 |
| 2011 | 19.8°C | 14.6°C | 9.5°C | 24.5°C | 4.6°C | 52 mm | 75% | 2.2 m/s | 4.5 |
| 2010 | 21.2°C | 15.0°C | 8.8°C | 25.8°C | 4.0°C | 33 mm | 70% | 2.3 m/s | 4.7 |
| 2009 | 19.6°C | 14.1°C | 8.6°C | 23.0°C | 4.1°C | 19 mm | 72% | 2.1 m/s | 4.8 |
| 2008 | 20.6°C | 15.7°C | 10.9°C | 25.8°C | 7.5°C | 58 mm | 75% | 2.2 m/s | 4.4 |
| 2007 | 21.2°C | 15.9°C | 10.5°C | 25.8°C | 5.3°C | 24 mm | 74% | 2.4 m/s | 4.7 |
| 2006 | 18.3°C | 13.4°C | 8.5°C | 23.1°C | 5.1°C | 35 mm | 73% | 2.7 m/s | 4.4 |
| 2005 | 19.4°C | 14.9°C | 10.4°C | 25.9°C | 6.2°C | 109 mm | 78% | 2.4 m/s | 4.3 |
| 2004 | 18.2°C | 13.3°C | 8.4°C | 22.3°C | 3.9°C | 30 mm | 78% | 2.1 m/s | 4.7 |
| 2003 | 21.2°C | 16.3°C | 11.3°C | 25.2°C | 8.8°C | 34 mm | 74% | 1.9 m/s | 4.9 |
| 2002 | 20.8°C | 15.6°C | 10.4°C | 24.5°C | 6.5°C | 16 mm | 73% | 2.6 m/s | 4.7 |
| 2001 | 20.5°C | 15.4°C | 10.3°C | 24.5°C | 6.4°C | 10 mm | 72% | 2.3 m/s | 4.8 |
| 2000 | 20.2°C | 14.7°C | 9.2°C | 28.2°C | 5.1°C | 61 mm | 75% | 2.2 m/s | 4.9 |
| 1999 | 20.7°C | 16.2°C | 11.6°C | 24.6°C | 6.8°C | 77 mm | 78% | 2.3 m/s | 4.4 |
| 1998 | 21.0°C | 16.0°C | 11.1°C | 24.2°C | 6.1°C | 42 mm | 73% | 2.6 m/s | 4.4 |
| 1997 | 18.2°C | 13.4°C | 8.7°C | 26.0°C | 5.6°C | 99 mm | 78% | 2.2 m/s | 4.7 |
| 1996 | 17.6°C | 13.2°C | 8.7°C | 21.0°C | 5.1°C | 87 mm | 78% | 2.3 m/s | 4.4 |
| 1995 | 18.5°C | 14.0°C | 9.5°C | 22.7°C | 5.3°C | 57 mm | 80% | 2.5 m/s | 4.7 |
| 1994 | 18.0°C | 13.3°C | 8.7°C | 22.6°C | 5.0°C | 94 mm | 77% | 2.2 m/s | 4.6 |
| 1993 | 17.6°C | 13.0°C | 8.5°C | 22.1°C | 2.8°C | 86 mm | 79% | 2 m/s | 4.5 |
| 1992 ❄️ | 18.0°C | 12.5°C | 7.1°C | 25.6°C | 3.0°C | 69 mm | 75% | 2.3 m/s | 4.5 |
| 1991 | 18.9°C | 14.4°C | 9.8°C | 23.2°C | 6.0°C | 39 mm | 77% | 1.7 m/s | 4.8 |
| 1990 🔥 | 22.0°C | 16.5°C | 11.0°C | 27.5°C | 4.1°C | 54 mm | 71% | 2.2 m/s | 4.8 |
| 1989 | 20.6°C | 15.2°C | 9.8°C | 25.9°C | 5.1°C | 47 mm | 74% | 2.2 m/s | 4.5 |
| 1988 | 18.0°C | 13.3°C | 8.7°C | 24.6°C | 3.0°C | 84 mm | 76% | 2.6 m/s | 4.3 |
| 1987 🌧️ | 17.1°C | 13.0°C | 8.8°C | 22.0°C | 4.1°C | 133 mm | 81% | 2.2 m/s | 4.3 |
| 1986 | 18.6°C | 13.8°C | 9.1°C | 21.8°C | 4.6°C | 65 mm | 79% | 1.9 m/s | 4.7 |
| 1985 | 20.0°C | 14.8°C | 9.6°C | 24.4°C | 6.1°C | 49 mm | 74% | 2.3 m/s | 4.7 |
| 1984 | 18.9°C | 15.0°C | 11.0°C | 24.3°C | 4.7°C | 113 mm | 82% | 2.1 m/s | 3.9 |
| 1983 | 20.7°C | 14.9°C | 9.2°C | 26.4°C | 2.5°C | 42 mm | 70% | 2.6 m/s | — |
| 1982 | 20.0°C | 15.1°C | 10.3°C | 23.6°C | 5.3°C | 8 mm | 75% | 2.1 m/s | — |
| 1981 | 20.4°C | 16.1°C | 11.8°C | 27.2°C | 5.8°C | 96 mm | 79% | 2.2 m/s | — |
Actual recorded March data for each year, 1981–2025 — sourced from NASA POWER.
The average high in March is around 19.5°C with lows near 9.8°C (mean 14.7°C), based on 45 years of NASA POWER data.
March averages 63 mm of rainfall in Blenheim, about average for rainfall. The wettest on record was 133 mm in 1987.
The hottest March reached 28.2°C in 2000. The coldest dipped to 2.5°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average March temperatures have fallen by about 0.7°C. Daytime highs moved from 20°C to 19.3°C and overnight lows from 10.4°C to 9.7°C over the same span.
March is one of the warmer months of the year in Blenheim and about average for rainfall, so plan for around 19.5°C daytime highs and 9.8°C at night.
Not quite — March is the 10th coolest month in Blenheim, averaging 14.7°C.
For March in Blenheim, pack light layers you can adjust through the day, with typical highs of 19.5°C and lows of 9.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in March averages 77% — quite humid.
Average wind speed in March is 2.2 m/s. The windiest March on record averaged 2.7 m/s (2006).
The wettest March on record was 1987 with 133 mm. On average, March sees 63 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 Blenheim 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.
