July is one of the warmer months of the year in Welwyn Garden City, with average highs near 22.1°C and lows around 12.1°C (mean 17.1°C). It is about average for rainfall, averaging 56 mm of rainfall and 77% relative humidity across the period.
July is one of the warmer months of the year in Welwyn Garden City. Across 45 years of records, the warmest July in Welwyn Garden City was 2006 — when the month averaged 20.1°C — while the coldest were 1988 and 2000 at 15.1°C. Typical July days reach 22.1°C with nights near 12.1°C. The long-term trend is warming, about 0.3°C per decade.
July is about average for rainfall in Welwyn Garden City, averaging 56 mm of rainfall. The wettest July on record was 2002 with 105 mm, while the driest was 2022 at 8 mm.
Relative humidity in Welwyn Garden City during July averages 77%. The most humid July was 2002 at 81%, and the least humid was 1990 at 69%.
July receives about 5.1 kWh/m²/day of solar energy in Welwyn Garden City. 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 Welwyn Garden City 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 | 17.1°C | 16.8°C | 17.5°C | 17.6°C | +1.1°C |
| Avg High | 21.4°C | 22.4°C | 21.6°C | 22.5°C | 22.7°C | +1.3°C |
| Avg Low | 11.6°C | 11.8°C | 12.1°C | 12.4°C | 12.5°C | +0.9°C |
| Avg Rain | 54 mm | 43 mm | 69 mm | 56 mm | 59 mm | +5 mm |
July temperatures in Welwyn Garden City 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 34.7°C (2022).
Rainfall in July is about average for rainfall, averaging 56 mm, with a wettest year of 105 mm.
One of the best times to visit Welwyn Garden City
July is one of the best times to visit Welwyn Garden City. Expect days averaging 22.1°C and nights around 12.1°C (mean 17.1°C) — warmer than Welwyn Garden City's yearly average — with moderate rainfall (56 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 | 24.1°C | 18.8°C | 13.4°C | 30.9°C | 9.2°C | 60 mm | 72% | 2.6 m/s | 5.2 |
| 2024 | 21.9°C | 16.9°C | 11.9°C | 28.4°C | 7.7°C | 70 mm | 79% | 2.7 m/s | 4.9 |
| 2023 | 21.4°C | 16.8°C | 12.3°C | 26.6°C | 8.8°C | 88 mm | 76% | 3.6 m/s | 4.5 |
| 2022 | 24.9°C | 19.0°C | 13.1°C | 34.7°C | 8.8°C | 8 mm | 70% | 2.7 m/s | 5.5 |
| 2021 | 22.5°C | 17.7°C | 12.9°C | 28.2°C | 8.5°C | 63 mm | 80% | 2.6 m/s | 5.1 |
| 2020 | 21.5°C | 16.5°C | 11.5°C | 30.5°C | 7.8°C | 65 mm | 76% | 3.2 m/s | 5 |
| 2019 | 23.5°C | 18.4°C | 13.3°C | 33.8°C | 8.8°C | 68 mm | 75% | 2.7 m/s | 5.3 |
| 2018 | 25.5°C | 19.7°C | 13.9°C | 31.5°C | 9.8°C | 25 mm | 72% | 2.3 m/s | 6 |
| 2017 | 22.0°C | 17.3°C | 12.6°C | 26.4°C | 10.4°C | 76 mm | 77% | 3.1 m/s | 4.9 |
| 2016 | 21.9°C | 17.1°C | 12.4°C | 28.8°C | 8.1°C | 28 mm | 79% | 2.9 m/s | 5.2 |
| 2015 | 21.7°C | 16.7°C | 11.6°C | 29.4°C | 8.4°C | 89 mm | 75% | 3.3 m/s | 5 |
| 2014 | 23.2°C | 18.1°C | 12.9°C | 28.3°C | 9.1°C | 52 mm | 77% | 2.7 m/s | 5.7 |
| 2013 | 23.7°C | 18.2°C | 12.8°C | 28.5°C | 8.6°C | 44 mm | 77% | 2.4 m/s | 5.9 |
| 2012 | 20.4°C | 15.9°C | 11.4°C | 27.4°C | 8.2°C | 103 mm | 80% | 2.9 m/s | 4.6 |
| 2011 | 20.3°C | 15.3°C | 10.4°C | 25.3°C | 7.4°C | 48 mm | 75% | 2.8 m/s | 4.8 |
| 2010 | 23.1°C | 18.1°C | 13.0°C | 27.7°C | 9.4°C | 29 mm | 74% | 3 m/s | 5 |
| 2009 | 21.1°C | 16.4°C | 11.7°C | 26.8°C | 8.6°C | 78 mm | 77% | 3.4 m/s | 4.9 |
| 2008 | 21.7°C | 16.8°C | 11.9°C | 27.1°C | 7.4°C | 61 mm | 77% | 3.2 m/s | 5.1 |
| 2007 | 19.9°C | 15.7°C | 11.4°C | 23.3°C | 8.4°C | 89 mm | 80% | 3.5 m/s | 4.6 |
| 2006 🔥 | 26.1°C | 20.1°C | 14.2°C | 31.4°C | 9.2°C | 37 mm | 72% | 2.6 m/s | 6 |
| 2005 | 21.7°C | 16.9°C | 12.1°C | 28.2°C | 9.2°C | 67 mm | 79% | 3 m/s | 4.7 |
| 2004 | 20.8°C | 16.2°C | 11.6°C | 26.1°C | 7.6°C | 67 mm | 79% | 2.7 m/s | 4.7 |
| 2003 | 22.0°C | 17.4°C | 12.8°C | 27.4°C | 9.7°C | 55 mm | 81% | 2.8 m/s | 4.9 |
| 2002 🌧️ | 20.9°C | 16.3°C | 11.7°C | 27.9°C | 8.0°C | 105 mm | 81% | 2.6 m/s | 4.6 |
| 2001 | 21.8°C | 17.2°C | 12.6°C | 28.1°C | 7.2°C | 69 mm | 80% | 2.6 m/s | 5 |
| 2000 | 19.6°C | 15.1°C | 10.6°C | 23.5°C | 6.5°C | 58 mm | 81% | 2.5 m/s | 4.8 |
| 1999 | 22.9°C | 17.5°C | 12.1°C | 27.1°C | 8.8°C | 18 mm | 77% | 2.9 m/s | 5.9 |
| 1998 | 20.1°C | 15.5°C | 11.0°C | 25.0°C | 7.9°C | 35 mm | 79% | 3.3 m/s | 4.7 |
| 1997 | 21.9°C | 16.8°C | 11.7°C | 26.0°C | 8.3°C | 36 mm | 76% | 2.7 m/s | 5.2 |
| 1996 | 22.5°C | 16.8°C | 11.1°C | 29.6°C | 6.9°C | 39 mm | 74% | 2.8 m/s | 5.2 |
| 1995 | 23.9°C | 18.5°C | 13.0°C | 29.2°C | 9.6°C | 38 mm | 78% | 2.7 m/s | 5.4 |
| 1994 | 23.5°C | 18.0°C | 12.6°C | 28.6°C | 9.9°C | 38 mm | 78% | 2.5 m/s | 5.9 |
| 1993 | 20.2°C | 15.5°C | 10.8°C | 24.4°C | 6.5°C | 66 mm | 78% | 3.3 m/s | 4.8 |
| 1992 | 22.1°C | 17.1°C | 12.1°C | 26.1°C | 9.0°C | 83 mm | 76% | 2.8 m/s | 4.5 |
| 1991 | 23.2°C | 18.0°C | 12.7°C | 27.8°C | 10.4°C | 57 mm | 76% | 3.2 m/s | 5.1 |
| 1990 | 23.5°C | 17.5°C | 11.4°C | 29.8°C | 6.4°C | 21 mm | 69% | 3.2 m/s | 5.5 |
| 1989 | 23.4°C | 17.9°C | 12.4°C | 29.7°C | 8.4°C | 42 mm | 76% | 2.7 m/s | 5.4 |
| 1988 ❄️ | 19.3°C | 15.1°C | 10.8°C | 23.8°C | 7.9°C | 90 mm | 81% | 4 m/s | 4.5 |
| 1987 | 20.4°C | 16.0°C | 11.6°C | 27.1°C | 8.3°C | 87 mm | 80% | 2.8 m/s | 4.6 |
| 1986 | 21.2°C | 16.3°C | 11.4°C | 27.0°C | 7.2°C | 57 mm | 77% | 2.8 m/s | 4.6 |
| 1985 | 21.3°C | 16.3°C | 11.3°C | 25.4°C | 8.3°C | 50 mm | 79% | 3.1 m/s | 5 |
| 1984 | 21.3°C | 16.0°C | 10.6°C | 26.3°C | 5.5°C | 30 mm | 78% | 2.6 m/s | 5.5 |
| 1983 | 24.2°C | 18.9°C | 13.6°C | 28.6°C | 7.3°C | 57 mm | 81% | 2.1 m/s | — |
| 1982 | 21.6°C | 16.6°C | 11.6°C | 27.2°C | 7.3°C | 37 mm | 80% | 2.8 m/s | — |
| 1981 | 20.1°C | 15.6°C | 11.0°C | 24.9°C | 8.2°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 22.1°C with lows near 12.1°C (mean 17.1°C), based on 45 years of NASA POWER data.
July averages 56 mm of rainfall in Welwyn Garden City, about average for rainfall. The wettest on record was 105 mm in 2002.
The hottest July reached 34.7°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 21.7°C to 23°C and overnight lows from 11.6°C to 12.7°C over the same span.
July is one of the warmer months of the year in Welwyn Garden City and about average for rainfall, so plan for around 22.1°C daytime highs and 12.1°C at night.
Not quite — July is the 12th coolest month in Welwyn Garden City, averaging 17.1°C.
For July in Welwyn Garden City, pack light layers you can adjust through the day, with typical highs of 22.1°C and lows of 12.1°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 105 mm. On average, July sees 56 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 Welwyn Garden City 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.
