March is one of the cooler months of the year in Grantham, with average highs near 10.1°C and lows around 2.2°C (mean 6.2°C). It is about average for rainfall, averaging 50 mm of rainfall and 86% relative humidity across the period.
March is one of the cooler months of the year in Grantham. Across 45 years of records, the warmest March in Grantham was 2012 — when the month averaged 8.2°C — while the coldest was 2013 at 2.3°C. Typical March days reach 10.1°C with nights near 2.2°C. The long-term trend is warming, about 0.3°C per decade.
March is about average for rainfall in Grantham, averaging 50 mm of rainfall. The wettest March on record was 1981 with 110 mm, while the driest was 2011 at 11 mm.
Relative humidity in Grantham during March averages 86%. The most humid March was 1981 at 89%, and the least humid was 1993 at 82%.
March receives about 2.5 kWh/m²/day of solar energy in Grantham. The sunniest March was 2025 at 3.2 kWh/m²/day, and the cloudiest was 1996 at 1.9.
Average wind speed in Grantham during March is 3.8 m/s. The windiest March was 1994 at 5.3 m/s, while the calmest was 2011 at 2.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 5.1°C | 6.6°C | 6.0°C | 6.1°C | 7.0°C | +1.9°C |
| Avg High | 8.9°C | 10.6°C | 9.9°C | 10.1°C | 11.1°C | +2.2°C |
| Avg Low | 1.4°C | 2.7°C | 2.2°C | 2.1°C | 2.9°C | +1.5°C |
| Avg Rain | 66 mm | 44 mm | 44 mm | 50 mm | 46 mm | -20 mm |
March temperatures in Grantham have risen by about 2°C between 1981–1985 and 2021–2025.
March has ranged from a record low of -4.9°C (1986) to a record high of 19.6°C (2012).
Rainfall in March is about average for rainfall, averaging 50 mm, with a wettest year of 110 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.4°C per decade while lows rose 0.2°C per decade, widening the gap between day and night.
A quieter season to visit Grantham
If your dates are flexible, the more temperate months of July and August tend to be the most comfortable for visiting Grantham. That said, March — with days averaging 10.1°C and nights around 2.2°C (mean 6.2°C) and moderate rainfall (50 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 | 12.4°C | 7.3°C | 2.2°C | 17.3°C | -1.8°C | 16 mm | 85% | 2.8 m/s | 3.2 |
| 2024 | 11.5°C | 8.0°C | 4.4°C | 15.7°C | -1.8°C | 69 mm | 88% | 3.8 m/s | 2.3 |
| 2023 | 10.1°C | 6.5°C | 2.8°C | 15.7°C | -3.7°C | 87 mm | 86% | 3.9 m/s | 2.3 |
| 2022 | 12.2°C | 7.7°C | 3.2°C | 17.6°C | -1.9°C | 45 mm | 84% | 3.2 m/s | 2.9 |
| 2021 | 10.6°C | 6.8°C | 3.0°C | 19.6°C | -2.7°C | 36 mm | 86% | 3.7 m/s | 2.4 |
| 2020 | 10.0°C | 5.9°C | 1.7°C | 14.8°C | -1.6°C | 24 mm | 85% | 4.2 m/s | 2.9 |
| 2019 | 11.7°C | 7.8°C | 4.0°C | 16.6°C | 1.2°C | 64 mm | 83% | 4.4 m/s | 2.8 |
| 2018 | 7.7°C | 4.4°C | 1.1°C | 13.1°C | -4.3°C | 89 mm | 87% | 3.8 m/s | 2.2 |
| 2017 | 11.8°C | 8.0°C | 4.2°C | 18.6°C | 0.8°C | 54 mm | 87% | 3.7 m/s | 2.6 |
| 2016 | 9.2°C | 5.2°C | 1.2°C | 13.5°C | -3.0°C | 91 mm | 86% | 3.3 m/s | 2.6 |
| 2015 | 10.0°C | 5.9°C | 1.7°C | 14.4°C | -1.0°C | 33 mm | 83% | 4.1 m/s | 2.7 |
| 2014 | 11.8°C | 7.4°C | 2.9°C | 17.7°C | -1.8°C | 23 mm | 85% | 3.6 m/s | 2.9 |
| 2013 ❄️ | 5.3°C | 2.3°C | -0.6°C | 10.7°C | -3.2°C | 61 mm | 85% | 3.5 m/s | 2.1 |
| 2012 🔥 | 13.1°C | 8.2°C | 3.4°C | 19.6°C | 0.1°C | 27 mm | 83% | 2.7 m/s | 2.9 |
| 2011 | 10.9°C | 6.4°C | 2.0°C | 16.6°C | -3.6°C | 11 mm | 84% | 2.5 m/s | 2.7 |
| 2010 | 9.5°C | 5.5°C | 1.5°C | 14.4°C | -4.5°C | 51 mm | 87% | 3.3 m/s | 2.6 |
| 2009 | 10.4°C | 6.2°C | 2.0°C | 14.5°C | -3.5°C | 31 mm | 86% | 3.6 m/s | 2.9 |
| 2008 | 8.9°C | 5.4°C | 1.9°C | 13.7°C | -3.8°C | 72 mm | 85% | 4.8 m/s | 2.6 |
| 2007 | 10.9°C | 6.9°C | 2.9°C | 16.1°C | -2.2°C | 45 mm | 85% | 4.1 m/s | 2.9 |
| 2006 | 7.7°C | 4.3°C | 0.9°C | 15.9°C | -4.0°C | 58 mm | 84% | 4 m/s | 2.4 |
| 2005 | 10.4°C | 6.8°C | 3.1°C | 17.6°C | -2.5°C | 43 mm | 88% | 3.5 m/s | 2.2 |
| 2004 | 9.7°C | 5.9°C | 2.1°C | 16.2°C | -3.6°C | 38 mm | 87% | 3.5 m/s | 2.3 |
| 2003 | 11.2°C | 6.7°C | 2.3°C | 15.0°C | -1.4°C | 30 mm | 87% | 3 m/s | 3 |
| 2002 | 10.9°C | 6.8°C | 2.7°C | 15.3°C | -2.0°C | 39 mm | 87% | 3.6 m/s | 2.6 |
| 2001 | 7.9°C | 4.5°C | 1.2°C | 15.3°C | -3.4°C | 62 mm | 89% | 3.3 m/s | 2.2 |
| 2000 | 11.1°C | 6.9°C | 2.6°C | 16.7°C | -2.9°C | 24 mm | 85% | 3.9 m/s | 2.5 |
| 1999 | 10.6°C | 7.0°C | 3.4°C | 17.1°C | -2.1°C | 71 mm | 88% | 3.6 m/s | 2.5 |
| 1998 | 11.2°C | 7.4°C | 3.6°C | 17.9°C | -3.8°C | 74 mm | 87% | 3.8 m/s | 2.1 |
| 1997 | 12.4°C | 8.1°C | 3.8°C | 16.3°C | -1.3°C | 20 mm | 85% | 3.8 m/s | 2.7 |
| 1996 | 7.6°C | 4.0°C | 0.3°C | 10.7°C | -3.8°C | 29 mm | 85% | 3.2 m/s | 1.9 |
| 1995 | 8.5°C | 4.6°C | 0.6°C | 15.8°C | -4.5°C | 49 mm | 85% | 4.4 m/s | 2.6 |
| 1994 | 10.3°C | 6.6°C | 2.9°C | 17.3°C | -0.6°C | 57 mm | 84% | 5.3 m/s | 2.4 |
| 1993 | 10.8°C | 6.3°C | 1.8°C | 17.4°C | -2.6°C | 18 mm | 82% | 3.7 m/s | 2.5 |
| 1992 | 10.6°C | 7.0°C | 3.4°C | 16.0°C | 0.4°C | 59 mm | 83% | 4.7 m/s | 2.2 |
| 1991 | 11.7°C | 7.7°C | 3.8°C | 17.6°C | -2.2°C | 47 mm | 87% | 3.5 m/s | 2.1 |
| 1990 | 12.0°C | 7.7°C | 3.5°C | 18.8°C | -2.7°C | 15 mm | 83% | 4.6 m/s | 2.7 |
| 1989 | 10.8°C | 6.8°C | 2.8°C | 16.6°C | -3.1°C | 58 mm | 86% | 4.4 m/s | 2.2 |
| 1988 | 8.8°C | 5.2°C | 1.7°C | 13.5°C | -3.2°C | 78 mm | 87% | 4 m/s | 2.1 |
| 1987 | 7.0°C | 3.2°C | -0.6°C | 13.2°C | -4.9°C | 60 mm | 86% | 3.9 m/s | 2.4 |
| 1986 | 8.4°C | 4.6°C | 0.7°C | 12.6°C | -4.9°C | 56 mm | 87% | 4.2 m/s | 2.4 |
| 1985 | 7.8°C | 4.1°C | 0.3°C | 14.8°C | -3.9°C | 45 mm | 87% | 3.2 m/s | 2.1 |
| 1984 | 7.7°C | 4.1°C | 0.6°C | 11.8°C | -2.6°C | 57 mm | 88% | 3 m/s | 2.1 |
| 1983 | 9.3°C | 5.6°C | 1.9°C | 15.1°C | -2.8°C | 48 mm | 88% | 4.1 m/s | — |
| 1982 | 9.2°C | 5.4°C | 1.5°C | 15.9°C | -3.0°C | 86 mm | 87% | 4.2 m/s | — |
| 1981 🌧️ | 10.7°C | 7.3°C | 3.9°C | 15.3°C | -1.1°C | 110 mm | 89% | 4.3 m/s | — |
Actual recorded March data for each year, 1981–2025 — sourced from NASA POWER.
The average high in March is around 10.1°C with lows near 2.2°C (mean 6.2°C), based on 45 years of NASA POWER data.
March averages 50 mm of rainfall in Grantham, about average for rainfall. The wettest on record was 110 mm in 1981.
The hottest March reached 19.6°C in 2012. The coldest dipped to -4.9°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average March temperatures have risen by about 2°C. Daytime highs moved from 8.9°C to 11.4°C and overnight lows from 1.6°C to 3.1°C over the same span.
March is one of the cooler months of the year in Grantham and about average for rainfall, so plan for around 10.1°C daytime highs and 2.2°C at night.
Not quite — March is the 4th coolest month in Grantham, averaging 6.2°C.
For March in Grantham, pack warm layers and a jacket for chilly mornings, with typical highs of 10.1°C and lows of 2.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in March averages 86% — quite humid.
Average wind speed in March is 3.8 m/s. The windiest March on record averaged 5.3 m/s (1994).
The wettest March on record was 1981 with 110 mm. On average, March sees 50 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 Grantham 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.
