March is one of the cooler months of the year in Norwalk, with average highs near 6.5°C and lows around -0.1°C (mean 3.2°C). It is about average for rainfall, averaging 107 mm of rainfall and 82% relative humidity across the period.
March is one of the cooler months of the year in Norwalk. Across 45 years of records, the warmest March in Norwalk was 2012 — when the month averaged 7.3°C — while the coldest were 1984 and 2015 at 0.4°C. Typical March days reach 6.5°C with nights near -0.1°C. The long-term trend is warming, about 0.4°C per decade.
March is about average for rainfall in Norwalk, averaging 107 mm of rainfall. The wettest March on record was 2010 with 260 mm, while the driest was 2006 at 21 mm.
Relative humidity in Norwalk during March averages 82%. The most humid March was 1994 at 87%, and the least humid was 1985 at 74%.
March receives about 3.7 kWh/m²/day of solar energy in Norwalk. The sunniest Marchs were 1986, 2006 and 2021 at 4.2 kWh/m²/day, and the cloudiest was 2001 at 3.
Average wind speed in Norwalk during March is 3.1 m/s. The windiest Marchs were 1999, 2017 and 2018, among others at 3.8 m/s, while the calmest was 1995 at 2.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 2.7°C | 2.6°C | 3.2°C | 3.2°C | 5.0°C | +2.3°C |
| Avg High | 6.2°C | 5.9°C | 6.5°C | 6.3°C | 8.4°C | +2.2°C |
| Avg Low | -0.7°C | -0.7°C | -0.1°C | 0.2°C | 1.7°C | +2.4°C |
| Avg Rain | 101 mm | 112 mm | 101 mm | 109 mm | 117 mm | +16 mm |
March temperatures in Norwalk have risen by about 2.2°C between 1981–1985 and 2021–2025.
March has ranged from a record low of -12.1°C (2015) to a record high of 19.4°C (2025).
Rainfall in March is about average for rainfall, averaging 107 mm, with a wettest year of 260 mm.
A quieter season to visit Norwalk
If your dates are flexible, the more temperate months of August and July tend to be the most comfortable for visiting Norwalk. That said, March — with days averaging 6.5°C and nights around -0.1°C (mean 3.2°C) and higher rainfall (107 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 | 9.0°C | 5.3°C | 1.6°C | 19.4°C | -5.7°C | 88 mm | 79% | 3.1 m/s | 3.8 |
| 2024 | 9.0°C | 5.8°C | 2.5°C | 16.1°C | -2.6°C | 245 mm | 83% | 3.1 m/s | 3.7 |
| 2023 | 7.5°C | 4.4°C | 1.3°C | 11.9°C | -1.7°C | 101 mm | 80% | 3.2 m/s | 3.8 |
| 2022 | 7.7°C | 4.4°C | 1.1°C | 16.7°C | -5.0°C | 87 mm | 80% | 3.1 m/s | 3.6 |
| 2021 | 7.9°C | 4.3°C | 0.7°C | 17.5°C | -5.8°C | 77 mm | 78% | 3 m/s | 4.2 |
| 2020 | 9.1°C | 5.9°C | 2.8°C | 14.8°C | -4.4°C | 103 mm | 81% | 3 m/s | 3.7 |
| 2019 | 5.3°C | 2.3°C | -0.6°C | 11.2°C | -9.0°C | 90 mm | 82% | 3 m/s | 3.9 |
| 2018 | 5.4°C | 2.7°C | 0.0°C | 11.0°C | -3.8°C | 111 mm | 82% | 3.8 m/s | 3.6 |
| 2017 | 5.0°C | 1.7°C | -1.5°C | 11.6°C | -9.6°C | 130 mm | 77% | 3.8 m/s | 3.8 |
| 2016 | 9.2°C | 5.7°C | 2.2°C | 17.5°C | -3.0°C | 55 mm | 79% | 3 m/s | 4.1 |
| 2015 | 3.3°C | 0.4°C | -2.5°C | 9.1°C | -12.1°C | 124 mm | 82% | 2.9 m/s | 3.6 |
| 2014 | 4.0°C | 0.7°C | -2.6°C | 11.7°C | -9.7°C | 118 mm | 76% | 3.2 m/s | 3.6 |
| 2013 | 5.3°C | 2.6°C | 0.0°C | 10.5°C | -2.8°C | 66 mm | 80% | 3.4 m/s | 3.6 |
| 2012 🔥 | 10.7°C | 7.3°C | 4.0°C | 18.7°C | -3.6°C | 26 mm | 82% | 2.8 m/s | 4 |
| 2011 | 6.4°C | 3.2°C | 0.1°C | 15.2°C | -6.9°C | 107 mm | 81% | 3.2 m/s | 3.8 |
| 2010 🌧️ | 8.7°C | 5.6°C | 2.5°C | 15.2°C | -2.4°C | 260 mm | 85% | 3.1 m/s | 3.4 |
| 2009 | 6.5°C | 3.2°C | -0.1°C | 15.2°C | -8.7°C | 48 mm | 81% | 2.8 m/s | 3.8 |
| 2008 | 6.8°C | 3.5°C | 0.3°C | 12.9°C | -2.4°C | 128 mm | 80% | 3.3 m/s | 3.7 |
| 2007 | 5.7°C | 2.2°C | -1.3°C | 17.1°C | -11.5°C | 127 mm | 83% | 3.2 m/s | 3.8 |
| 2006 | 6.7°C | 3.4°C | 0.0°C | 14.8°C | -5.8°C | 21 mm | 78% | 3.1 m/s | 4.2 |
| 2005 | 4.8°C | 1.7°C | -1.4°C | 13.8°C | -7.3°C | 93 mm | 82% | 3.1 m/s | 3.7 |
| 2004 | 6.4°C | 3.4°C | 0.4°C | 15.5°C | -4.1°C | 91 mm | 83% | 2.9 m/s | 3.5 |
| 2003 | 6.5°C | 2.7°C | -1.1°C | 14.7°C | -10.7°C | 111 mm | 85% | 2.7 m/s | 3.9 |
| 2002 | 8.0°C | 4.5°C | 0.9°C | 16.0°C | -5.2°C | 106 mm | 78% | 3 m/s | 3.5 |
| 2001 | 5.0°C | 2.2°C | -0.5°C | 10.1°C | -4.1°C | 188 mm | 82% | 3.2 m/s | 3 |
| 2000 | 8.9°C | 5.3°C | 1.7°C | 16.1°C | -5.4°C | 99 mm | 81% | 2.9 m/s | 3.8 |
| 1999 | 6.9°C | 3.2°C | -0.6°C | 14.9°C | -7.9°C | 111 mm | 80% | 3.8 m/s | 4.1 |
| 1998 | 7.0°C | 4.1°C | 1.2°C | 17.8°C | -7.2°C | 154 mm | 86% | 3.1 m/s | 3.8 |
| 1997 | 6.2°C | 3.0°C | -0.1°C | 13.5°C | -4.4°C | 140 mm | 81% | 3.5 m/s | 3.6 |
| 1996 | 4.0°C | 0.7°C | -2.5°C | 11.1°C | -9.9°C | 81 mm | 82% | 3 m/s | 3.7 |
| 1995 | 6.9°C | 3.5°C | 0.1°C | 12.6°C | -7.4°C | 39 mm | 83% | 2.3 m/s | 3.9 |
| 1994 | 4.8°C | 1.6°C | -1.6°C | 14.0°C | -9.4°C | 149 mm | 87% | 2.8 m/s | 3.6 |
| 1993 | 4.5°C | 1.2°C | -2.1°C | 14.1°C | -11.2°C | 162 mm | 87% | 3.1 m/s | 3.6 |
| 1992 | 5.1°C | 1.7°C | -1.7°C | 12.6°C | -7.3°C | 92 mm | 80% | 3.1 m/s | 3.4 |
| 1991 | 7.1°C | 3.7°C | 0.3°C | 15.3°C | -5.2°C | 127 mm | 84% | 3.1 m/s | 3.2 |
| 1990 | 6.8°C | 3.4°C | -0.1°C | 17.4°C | -10.0°C | 68 mm | 83% | 2.7 m/s | 3.6 |
| 1989 | 5.4°C | 2.1°C | -1.2°C | 17.5°C | -8.9°C | 113 mm | 83% | 3 m/s | 3.6 |
| 1988 | 6.6°C | 2.9°C | -0.9°C | 14.1°C | -7.5°C | 82 mm | 81% | 2.9 m/s | 4.1 |
| 1987 | 7.3°C | 3.8°C | 0.3°C | 16.9°C | -8.6°C | 128 mm | 84% | 2.8 m/s | 3.8 |
| 1986 | 6.8°C | 3.0°C | -0.7°C | 15.5°C | -11.9°C | 73 mm | 83% | 2.9 m/s | 4.2 |
| 1985 | 7.5°C | 4.0°C | 0.4°C | 16.6°C | -4.2°C | 61 mm | 74% | 3.1 m/s | 4.1 |
| 1984 ❄️ | 3.4°C | 0.4°C | -2.7°C | 9.3°C | -11.5°C | 146 mm | 83% | 3.8 m/s | 3.6 |
| 1983 | 7.0°C | 3.9°C | 0.8°C | 11.5°C | -4.4°C | 204 mm | 84% | 3.5 m/s | — |
| 1982 | 5.7°C | 2.1°C | -1.4°C | 10.7°C | -8.8°C | 75 mm | 83% | 2.8 m/s | — |
| 1981 | 5.8°C | 2.4°C | -1.0°C | 15.1°C | -6.5°C | 29 mm | 79% | 3.2 m/s | — |
Actual recorded March data for each year, 1981–2025 — sourced from NASA POWER.
The average high in March is around 6.5°C with lows near -0.1°C (mean 3.2°C), based on 45 years of NASA POWER data.
March averages 107 mm of rainfall in Norwalk, about average for rainfall. The wettest on record was 260 mm in 2010.
The hottest March reached 19.4°C in 2025. The coldest dipped to -12.1°C in 2015.
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 5.9°C to 8.2°C and overnight lows from -0.8°C to 1.4°C over the same span.
March is one of the cooler months of the year in Norwalk and about average for rainfall, so plan for around 6.5°C daytime highs and -0.1°C at night.
Not quite — March is the 4th coolest month in Norwalk, averaging 3.2°C.
For March in Norwalk, pack warm layers and a jacket for chilly mornings, with typical highs of 6.5°C and lows of -0.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in March averages 82% — quite humid.
Average wind speed in March is 3.1 m/s. The windiest March on record averaged 3.8 m/s (1984).
The wettest March on record was 2010 with 260 mm. On average, March sees 107 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 Norwalk 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.
