May is one of the warmer months of the year in Grimsby, with average highs near 13.7°C and lows around 7.8°C (mean 10.8°C). It is about average for rainfall, averaging 50 mm of rainfall and 83% relative humidity across the period.
May is one of the warmer months of the year in Grimsby. Across 45 years of records, the warmest May in Grimsby was 2024 — when the month averaged 12.8°C — while the coldest was 1996 at 8.4°C. Typical May days reach 13.7°C with nights near 7.8°C. The long-term trend is warming, about 0.4°C per decade.
May is about average for rainfall in Grimsby, averaging 50 mm of rainfall. The wettest May on record was 2014 with 113 mm, while the driest was 2020 at 10 mm.
Relative humidity in Grimsby during May averages 83%. The most humid May was 2024 at 88%, and the least humid was 2011 at 79%.
May receives about 4.7 kWh/m²/day of solar energy in Grimsby. The sunniest May was 2020 at 5.7 kWh/m²/day, and the cloudiest was 1991 at 4.
Average wind speed in Grimsby during May is 3.8 m/s. The windiest May was 2011 at 4.6 m/s, while the calmest was 2004 at 3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 9.9°C | 10.6°C | 11.0°C | 10.9°C | 11.6°C | +1.7°C |
| Avg High | 12.8°C | 13.6°C | 13.9°C | 13.8°C | 14.6°C | +1.8°C |
| Avg Low | 7.0°C | 7.6°C | 8.1°C | 8.0°C | 8.7°C | +1.7°C |
| Avg Rain | — | 38 mm | 57 mm | 56 mm | 47 mm | — |
May temperatures in Grimsby have risen by about 2°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 1.7°C (1997) to a record high of 22.2°C (1992).
Rainfall in May is about average for rainfall, averaging 50 mm, with a wettest year of 113 mm.
A good time to visit Grimsby
May is a good time to visit Grimsby, with days averaging 13.7°C and nights around 7.8°C (mean 10.8°C, warmer than Grimsby's yearly average) and moderate rainfall. August and July are marginally more temperate, but May still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 15.0°C | 12.0°C | 9.0°C | 20.6°C | 5.6°C | 30 mm | 81% | 3.9 m/s | 5.5 |
| 2024 🔥 | 15.6°C | 12.8°C | 10.0°C | 19.0°C | 8.1°C | 68 mm | 88% | 3.4 m/s | 4.3 |
| 2023 | 14.4°C | 11.5°C | 8.7°C | 18.0°C | 5.6°C | 35 mm | 84% | 3.2 m/s | 5.1 |
| 2022 | 15.4°C | 12.4°C | 9.4°C | 18.6°C | 7.0°C | 47 mm | 83% | 3.5 m/s | 4.6 |
| 2021 | 12.4°C | 9.6°C | 6.8°C | 16.5°C | 3.0°C | 92 mm | 84% | 3.7 m/s | 4.4 |
| 2020 | 14.9°C | 11.5°C | 8.1°C | 20.8°C | 3.6°C | 10 mm | 79% | 3.5 m/s | 5.7 |
| 2019 | 13.7°C | 10.8°C | 7.8°C | 19.2°C | 4.8°C | 43 mm | 81% | 3.2 m/s | 4.9 |
| 2018 | 14.9°C | 11.6°C | 8.3°C | 19.6°C | 2.6°C | 43 mm | 84% | 3.6 m/s | 5.6 |
| 2017 | 14.9°C | 12.0°C | 9.1°C | 21.1°C | 4.3°C | 69 mm | 84% | 3.9 m/s | 4.8 |
| 2016 | 13.7°C | 10.9°C | 8.2°C | 16.3°C | 3.0°C | 47 mm | 84% | 3.9 m/s | 4.8 |
| 2015 | 13.1°C | 10.3°C | 7.4°C | 16.7°C | 3.4°C | 76 mm | 80% | 4.4 m/s | 4.4 |
| 2014 🌧️ | 14.5°C | 11.8°C | 9.1°C | 19.2°C | 4.5°C | 113 mm | 83% | 3.5 m/s | 4.4 |
| 2013 | 12.7°C | 9.7°C | 6.6°C | 17.0°C | 2.8°C | 64 mm | 83% | 4.2 m/s | 4.4 |
| 2012 | 13.4°C | 10.6°C | 7.8°C | 22.1°C | 3.5°C | 44 mm | 83% | 3.8 m/s | 4.9 |
| 2011 | 14.6°C | 11.5°C | 8.4°C | 17.2°C | 5.4°C | 40 mm | 79% | 4.6 m/s | 4.8 |
| 2010 | 12.9°C | 9.9°C | 7.0°C | 22.0°C | 3.5°C | 19 mm | 79% | 3.3 m/s | 4.9 |
| 2009 | 14.2°C | 11.3°C | 8.5°C | 18.8°C | 5.6°C | 61 mm | 83% | 4.4 m/s | 4.9 |
| 2008 | 14.2°C | 11.5°C | 8.7°C | 19.1°C | 4.9°C | 30 mm | 85% | 3.9 m/s | 4.9 |
| 2007 | 13.5°C | 10.8°C | 8.1°C | 18.8°C | 5.6°C | 95 mm | 83% | 3.9 m/s | 4.4 |
| 2006 | 14.0°C | 11.0°C | 8.0°C | 19.3°C | 4.9°C | 86 mm | 83% | 4.1 m/s | 4.3 |
| 2005 | 13.4°C | 10.4°C | 7.4°C | 18.1°C | 4.1°C | 36 mm | 81% | 4.2 m/s | 4.8 |
| 2004 | 14.2°C | 11.1°C | 8.0°C | 19.5°C | 5.4°C | 38 mm | 83% | 3 m/s | 4.9 |
| 2003 | 14.3°C | 11.3°C | 8.2°C | 19.8°C | 4.5°C | 52 mm | 84% | 4.1 m/s | 4.5 |
| 2002 | 14.1°C | 11.2°C | 8.3°C | 19.7°C | 4.8°C | 57 mm | 84% | 4.4 m/s | 4.1 |
| 2001 | 13.6°C | 10.6°C | 7.6°C | 19.0°C | 4.0°C | 31 mm | 84% | 3.1 m/s | 5 |
| 2000 | 13.4°C | 10.6°C | 7.8°C | 20.7°C | 5.7°C | 84 mm | 86% | 3.8 m/s | 4.6 |
| 1999 | 14.8°C | 11.9°C | 8.9°C | 19.5°C | 7.0°C | 38 mm | 83% | 4 m/s | 4.6 |
| 1998 | 14.2°C | 11.2°C | 8.3°C | 18.2°C | 4.0°C | 31 mm | 85% | 3.5 m/s | 5.4 |
| 1997 | 13.8°C | 10.5°C | 7.1°C | 19.5°C | 1.7°C | 43 mm | 81% | 3.5 m/s | 4.8 |
| 1996 ❄️ | 11.1°C | 8.4°C | 5.6°C | 17.4°C | 1.9°C | 44 mm | 81% | 4.3 m/s | 4.2 |
| 1995 | 13.7°C | 10.6°C | 7.5°C | 21.5°C | 2.6°C | 49 mm | 81% | 3.8 m/s | 4.6 |
| 1994 | 11.9°C | 9.5°C | 7.1°C | 16.1°C | 5.0°C | 57 mm | 84% | 4 m/s | 4.6 |
| 1993 | 13.3°C | 10.4°C | 7.5°C | 17.8°C | 3.2°C | 41 mm | 82% | 4.4 m/s | 4.3 |
| 1992 | 15.4°C | 11.9°C | 8.4°C | 22.2°C | 4.6°C | 18 mm | 81% | 3.7 m/s | 5.5 |
| 1991 | 12.7°C | 9.9°C | 7.1°C | 17.7°C | 3.7°C | 16 mm | 81% | 3.7 m/s | 4 |
| 1990 | 14.6°C | 11.3°C | 8.0°C | — | — | — | — | — | — |
| 1989 | 14.9°C | 11.2°C | 7.6°C | — | — | — | — | — | — |
| 1988 | 13.3°C | 10.6°C | 7.9°C | — | — | — | — | — | — |
| 1987 | 11.6°C | 8.7°C | 5.9°C | — | — | — | — | — | — |
| 1986 | 13.3°C | 10.3°C | 7.2°C | — | — | — | — | — | — |
| 1985 | 12.4°C | 9.8°C | 7.2°C | — | — | — | — | — | — |
| 1984 | 11.5°C | 8.8°C | 6.1°C | — | — | — | — | — | — |
| 1983 | 11.4°C | 8.9°C | 6.4°C | — | — | — | — | — | — |
| 1982 | 13.6°C | 10.3°C | 7.0°C | — | — | — | — | — | — |
| 1981 | 13.2°C | 10.5°C | 7.8°C | — | — | — | — | — | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 13.7°C with lows near 7.8°C (mean 10.8°C), based on 45 years of NASA POWER data.
May averages 50 mm of rainfall in Grimsby, about average for rainfall. The wettest on record was 113 mm in 2014.
The hottest May reached 22.2°C in 1992. The coldest dipped to 1.7°C in 1997.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 2°C. Daytime highs moved from 12.4°C to 14.6°C and overnight lows from 6.9°C to 8.8°C over the same span.
May is one of the warmer months of the year in Grimsby and about average for rainfall, so plan for around 13.7°C daytime highs and 7.8°C at night.
Not quite — May is the 7th coolest month in Grimsby, averaging 10.8°C.
For May in Grimsby, pack warm layers and a jacket for chilly mornings, with typical highs of 13.7°C and lows of 7.8°C.
Relative humidity in May averages 83% — quite humid.
Average wind speed in May is 3.8 m/s. The windiest May on record averaged 4.6 m/s (2011).
The wettest May on record was 2014 with 113 mm. On average, May 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 Grimsby behaves each May, 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 May specifically, along with year-by-year records and how the month has changed over the decades.
