July is one of the warmer months of the year in Hemel Hempstead, with average highs near 22°C and lows around 11.9°C (mean 17°C). It is about average for rainfall, averaging 57 mm of rainfall and 77% relative humidity across the period.
July is one of the warmer months of the year in Hemel Hempstead. Across 45 years of records, the warmest July in Hemel Hempstead was 2006 — when the month averaged 20.2°C — while the coldest was 1988 at 14.8°C. Typical July days reach 22°C with nights near 11.9°C. The long-term trend is warming, about 0.3°C per decade.
July is about average for rainfall in Hemel Hempstead, averaging 57 mm of rainfall. The wettest July on record was 2002 with 106 mm, while the driest was 2022 at 12 mm.
Relative humidity in Hemel Hempstead during July averages 77%. The most humid July was 1981 at 81%, and the least humid was 1990 at 68%.
July receives about 5.1 kWh/m²/day of solar energy in Hemel Hempstead. The sunniest Julys were 2006 and 2018 at 6 kWh/m²/day, and the cloudiest were 1988, 1992 and 2023 at 4.5.
Average wind speed in Hemel Hempstead during July is 2.9 m/s. The windiest July was 1988 at 4 m/s, while the calmest was 1983 at 2.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 16.5°C | 17.0°C | 16.7°C | 17.3°C | 17.5°C | +1°C |
| Avg High | 21.5°C | 22.3°C | 21.5°C | 22.5°C | 22.7°C | +1.2°C |
| Avg Low | 11.5°C | 11.7°C | 11.8°C | 12.2°C | 12.4°C | +0.9°C |
| Avg Rain | 53 mm | 46 mm | 70 mm | 56 mm | 60 mm | +7 mm |
July temperatures in Hemel Hempstead have risen by about 1.1°C between 1981–1985 and 2021–2025.
July has ranged from a record low of 5.5°C (1984) to a record high of 36.3°C (2022).
Rainfall in July is about average for rainfall, averaging 57 mm, with a wettest year of 106 mm.
One of the best times to visit Hemel Hempstead
July is one of the best times to visit Hemel Hempstead. Expect days averaging 22°C and nights around 11.9°C (mean 17°C) — warmer than Hemel Hempstead's yearly average — with moderate rainfall (57 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 | 24.2°C | 18.8°C | 13.3°C | 30.8°C | 9.0°C | 56 mm | 72% | 2.6 m/s | 5.2 |
| 2024 | 21.8°C | 16.8°C | 11.7°C | 28.7°C | 7.3°C | 72 mm | 79% | 2.7 m/s | 4.9 |
| 2023 | 21.0°C | 16.5°C | 12.0°C | 26.5°C | 8.5°C | 91 mm | 77% | 3.6 m/s | 4.5 |
| 2022 | 25.0°C | 19.0°C | 13.0°C | 36.3°C | 8.7°C | 12 mm | 68% | 2.7 m/s | 5.5 |
| 2021 | 22.5°C | 17.8°C | 13.1°C | 28.8°C | 9.8°C | 62 mm | 80% | 2.5 m/s | 5.1 |
| 2020 | 21.4°C | 16.3°C | 11.2°C | 31.7°C | 7.4°C | 65 mm | 77% | 3.2 m/s | 5 |
| 2019 | 23.4°C | 18.2°C | 13.0°C | 34.3°C | 8.5°C | 76 mm | 75% | 2.7 m/s | 5.3 |
| 2018 | 25.5°C | 19.6°C | 13.7°C | 32.0°C | 9.8°C | 20 mm | 71% | 2.3 m/s | 6 |
| 2017 | 22.0°C | 17.2°C | 12.3°C | 28.1°C | 10.2°C | 83 mm | 76% | 3.1 m/s | 4.9 |
| 2016 | 21.5°C | 16.8°C | 12.0°C | 29.6°C | 7.9°C | 28 mm | 79% | 3 m/s | 5.2 |
| 2015 | 21.7°C | 16.5°C | 11.3°C | 30.5°C | 7.4°C | 83 mm | 74% | 3.3 m/s | 5 |
| 2014 | 23.2°C | 17.8°C | 12.4°C | 28.3°C | 8.5°C | 43 mm | 76% | 2.7 m/s | 5.7 |
| 2013 | 23.8°C | 18.2°C | 12.7°C | 28.8°C | 7.8°C | 51 mm | 77% | 2.4 m/s | 5.9 |
| 2012 | 20.1°C | 15.6°C | 11.1°C | 27.2°C | 7.6°C | 100 mm | 80% | 2.9 m/s | 4.6 |
| 2011 | 20.5°C | 15.4°C | 10.2°C | 25.1°C | 7.2°C | 44 mm | 74% | 2.7 m/s | 4.8 |
| 2010 | 22.8°C | 17.8°C | 12.9°C | 27.4°C | 9.3°C | 29 mm | 74% | 3.1 m/s | 5 |
| 2009 | 20.7°C | 16.1°C | 11.6°C | 27.6°C | 8.6°C | 88 mm | 78% | 3.5 m/s | 4.9 |
| 2008 | 21.6°C | 16.5°C | 11.5°C | 27.0°C | 7.1°C | 68 mm | 77% | 3.3 m/s | 5.1 |
| 2007 | 19.6°C | 15.4°C | 11.1°C | 22.5°C | 7.4°C | 105 mm | 81% | 3.5 m/s | 4.6 |
| 2006 🔥 | 26.4°C | 20.2°C | 14.1°C | 33.1°C | 9.0°C | 40 mm | 70% | 2.6 m/s | 6 |
| 2005 | 21.8°C | 16.9°C | 12.0°C | 28.8°C | 9.4°C | 65 mm | 78% | 3 m/s | 4.7 |
| 2004 | 20.7°C | 15.9°C | 11.1°C | 26.4°C | 7.3°C | 64 mm | 79% | 2.8 m/s | 4.7 |
| 2003 | 22.0°C | 17.2°C | 12.5°C | 28.0°C | 9.6°C | 52 mm | 80% | 2.8 m/s | 4.9 |
| 2002 🌧️ | 20.9°C | 16.2°C | 11.5°C | 28.0°C | 7.6°C | 106 mm | 80% | 2.6 m/s | 4.6 |
| 2001 | 21.9°C | 17.1°C | 12.3°C | 28.1°C | 6.9°C | 65 mm | 79% | 2.6 m/s | 5 |
| 2000 | 19.4°C | 15.0°C | 10.5°C | 23.4°C | 6.4°C | 52 mm | 81% | 2.4 m/s | 4.8 |
| 1999 | 22.8°C | 17.3°C | 11.7°C | 27.3°C | 8.2°C | 18 mm | 77% | 2.9 m/s | 5.9 |
| 1998 | 19.7°C | 15.2°C | 10.7°C | 24.2°C | 7.6°C | 35 mm | 80% | 3.3 m/s | 4.7 |
| 1997 | 21.9°C | 16.7°C | 11.5°C | 25.9°C | 7.6°C | 42 mm | 76% | 2.6 m/s | 5.2 |
| 1996 | 22.5°C | 16.7°C | 10.9°C | 30.0°C | 6.7°C | 38 mm | 73% | 2.8 m/s | 5.2 |
| 1995 | 24.0°C | 18.4°C | 12.7°C | 29.4°C | 9.1°C | 31 mm | 76% | 2.7 m/s | 5.4 |
| 1994 | 23.4°C | 17.9°C | 12.4°C | 28.8°C | 9.5°C | 53 mm | 78% | 2.5 m/s | 5.9 |
| 1993 | 20.0°C | 15.3°C | 10.6°C | 24.1°C | 6.1°C | 64 mm | 78% | 3.4 m/s | 4.8 |
| 1992 | 21.9°C | 17.0°C | 12.0°C | 27.0°C | 8.6°C | 89 mm | 76% | 2.8 m/s | 4.5 |
| 1991 | 23.2°C | 17.9°C | 12.6°C | 27.1°C | 10.1°C | 61 mm | 75% | 3.2 m/s | 5.1 |
| 1990 | 23.8°C | 17.6°C | 11.4°C | 30.4°C | 6.0°C | 24 mm | 68% | 3.3 m/s | 5.5 |
| 1989 | 23.8°C | 18.1°C | 12.4°C | 31.0°C | 7.9°C | 37 mm | 74% | 2.8 m/s | 5.4 |
| 1988 ❄️ | 19.0°C | 14.8°C | 10.6°C | 24.0°C | 7.9°C | 95 mm | 81% | 4 m/s | 4.5 |
| 1987 | 20.4°C | 15.9°C | 11.4°C | 26.9°C | 7.8°C | 73 mm | 80% | 2.9 m/s | 4.6 |
| 1986 | 21.1°C | 16.1°C | 11.1°C | 26.8°C | 7.2°C | 49 mm | 77% | 2.9 m/s | 4.6 |
| 1985 | 21.2°C | 16.2°C | 11.2°C | 25.2°C | 8.0°C | 53 mm | 79% | 3.1 m/s | 5 |
| 1984 | 22.0°C | 16.4°C | 10.8°C | 27.2°C | 5.5°C | 26 mm | 75% | 2.6 m/s | 5.5 |
| 1983 | 24.3°C | 19.0°C | 13.7°C | 28.5°C | 8.1°C | 64 mm | 80% | 2.1 m/s | — |
| 1982 | 21.4°C | 16.4°C | 11.3°C | 26.9°C | 7.5°C | 37 mm | 80% | 2.8 m/s | — |
| 1981 | 20.0°C | 15.4°C | 10.8°C | 24.9°C | 8.1°C | 40 mm | 81% | 2.8 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 22°C with lows near 11.9°C (mean 17°C), based on 45 years of NASA POWER data.
July averages 57 mm of rainfall in Hemel Hempstead, about average for rainfall. The wettest on record was 106 mm in 2002.
The hottest July reached 36.3°C in 2022. The coldest dipped to 5.5°C in 1984.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have risen by about 1.1°C. Daytime highs moved from 21.8°C to 22.9°C and overnight lows from 11.6°C to 12.6°C over the same span.
July is one of the warmer months of the year in Hemel Hempstead and about average for rainfall, so plan for around 22°C daytime highs and 11.9°C at night.
Not quite — July is the 12th coolest month in Hemel Hempstead, averaging 17°C.
For July in Hemel Hempstead, pack light layers you can adjust through the day, with typical highs of 22°C and lows of 11.9°C. Bring an umbrella or light rain jacket too.
Relative humidity in July averages 77% — quite humid.
Average wind speed in July is 2.9 m/s. The windiest July on record averaged 4 m/s (1988).
The wettest July on record was 2002 with 106 mm. On average, July sees 57 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 Hemel Hempstead behaves each July, 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 July specifically, along with year-by-year records and how the month has changed over the decades.
