July is one of the warmer months of the year in Caerphilly, with average highs near 20.1°C and lows around 12.7°C (mean 16.4°C). It is one of the drier months, averaging 69 mm of rainfall and 82% relative humidity across the period.
July is one of the warmer months of the year in Caerphilly. Across 45 years of records, the warmest July in Caerphilly was 1983 — when the month averaged 18.8°C — while the coldest was 1988 at 14.3°C. Typical July days reach 20.1°C with nights near 12.7°C. The long-term July temperature trend is broadly flat.
July is one of the drier months in Caerphilly, averaging 69 mm of rainfall. The wettest July on record was 2007 with 171 mm, while the driest was 2022 at 21 mm.
Relative humidity in Caerphilly during July averages 82%. The most humid July was 1988 at 85%, and the least humid was 1990 at 75%.
July receives about 5.1 kWh/m²/day of solar energy in Caerphilly. The sunniest July was 2013 at 6.1 kWh/m²/day, and the cloudiest was 2023 at 4.4.
Average wind speed in Caerphilly during July is 3.3 m/s. The windiest July was 1988 at 4.6 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 | 16.2°C | 16.3°C | 16.1°C | 16.6°C | 16.8°C | +0.6°C |
| Avg High | 20.0°C | 20.2°C | 19.6°C | 20.3°C | 20.4°C | +0.4°C |
| Avg Low | 12.4°C | 12.5°C | 12.6°C | 12.9°C | 13.1°C | +0.7°C |
| Avg Rain | 59 mm | 55 mm | 93 mm | 67 mm | 74 mm | +15 mm |
July temperatures in Caerphilly have risen by about 0.6°C between 1981–1985 and 2021–2025.
July has ranged from a record low of 7.4°C (1996) to a record high of 30.8°C (2006).
Rainfall in July is one of the drier months, averaging 69 mm, with a wettest year of 171 mm.
One of the best times to visit Caerphilly
July is one of the best times to visit Caerphilly. Expect days averaging 20.1°C and nights around 12.7°C (mean 16.4°C) — warmer than Caerphilly's yearly average — with moderate rainfall (69 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 | 21.8°C | 18.0°C | 14.1°C | 28.6°C | 11.5°C | 42 mm | 79% | 3.2 m/s | 5.6 |
| 2024 | 19.7°C | 16.2°C | 12.6°C | 25.5°C | 9.9°C | 88 mm | 83% | 3.1 m/s | 5 |
| 2023 | 19.0°C | 15.9°C | 12.8°C | 23.0°C | 10.4°C | 121 mm | 83% | 4.3 m/s | 4.4 |
| 2022 | 21.9°C | 17.6°C | 13.3°C | 30.4°C | 10.2°C | 21 mm | 78% | 2.9 m/s | 5.4 |
| 2021 | 21.3°C | 17.6°C | 13.8°C | 27.0°C | 11.6°C | 99 mm | 83% | 2.8 m/s | 5.3 |
| 2020 | 18.9°C | 15.6°C | 12.2°C | 25.1°C | 8.7°C | 72 mm | 83% | 4 m/s | 4.8 |
| 2019 | 21.0°C | 17.2°C | 13.4°C | 27.3°C | 9.6°C | 43 mm | 81% | 2.9 m/s | 5.5 |
| 2018 | 22.7°C | 18.4°C | 14.1°C | 25.8°C | 12.0°C | 39 mm | 78% | 2.7 m/s | 5.8 |
| 2017 | 19.9°C | 16.5°C | 13.0°C | 24.3°C | 10.7°C | 111 mm | 82% | 3.6 m/s | 5 |
| 2016 | 19.6°C | 16.2°C | 12.7°C | 27.1°C | 10.0°C | 43 mm | 84% | 3.6 m/s | 4.9 |
| 2015 | 19.0°C | 15.5°C | 12.1°C | 25.5°C | 9.2°C | 91 mm | 81% | 4 m/s | 4.9 |
| 2014 | 21.1°C | 17.1°C | 13.1°C | 24.8°C | 10.2°C | 37 mm | 81% | 3 m/s | 5.8 |
| 2013 | 22.2°C | 17.9°C | 13.7°C | 26.3°C | 9.9°C | 45 mm | 80% | 2.8 m/s | 6.1 |
| 2012 | 18.2°C | 15.0°C | 11.7°C | 24.5°C | 9.2°C | 114 mm | 84% | 3.5 m/s | 4.8 |
| 2011 | 18.9°C | 15.3°C | 11.7°C | 21.7°C | 8.9°C | 69 mm | 80% | 3 m/s | 4.9 |
| 2010 | 19.9°C | 16.6°C | 13.3°C | 22.8°C | 11.6°C | 76 mm | 82% | 3.7 m/s | 4.7 |
| 2009 | 18.8°C | 15.7°C | 12.7°C | 26.2°C | 10.4°C | 150 mm | 84% | 4.3 m/s | 4.7 |
| 2008 | 19.1°C | 15.7°C | 12.2°C | 24.9°C | 8.8°C | 107 mm | 84% | 3.9 m/s | 4.8 |
| 2007 🌧️ | 17.9°C | 15.0°C | 12.0°C | 20.0°C | 9.4°C | 171 mm | 85% | 4.1 m/s | 4.7 |
| 2006 | 23.1°C | 18.6°C | 14.2°C | 30.8°C | 10.7°C | 47 mm | 78% | 2.8 m/s | 5.9 |
| 2005 | 20.3°C | 16.7°C | 13.2°C | 26.0°C | 10.0°C | 76 mm | 82% | 3.2 m/s | 4.9 |
| 2004 | 18.7°C | 15.3°C | 11.9°C | 22.0°C | 9.5°C | 64 mm | 83% | 3.4 m/s | 4.7 |
| 2003 | 20.4°C | 16.8°C | 13.3°C | 28.2°C | 10.8°C | 89 mm | 83% | 3.4 m/s | 4.5 |
| 2002 | 18.5°C | 15.1°C | 11.7°C | 23.0°C | 9.4°C | 75 mm | 84% | 3.2 m/s | 4.8 |
| 2001 | 20.0°C | 16.4°C | 12.7°C | 26.1°C | 8.9°C | 80 mm | 82% | 3.1 m/s | 4.7 |
| 2000 | 18.7°C | 15.4°C | 12.0°C | 22.8°C | 9.6°C | 66 mm | 83% | 2.9 m/s | 5 |
| 1999 | 21.0°C | 16.9°C | 12.8°C | 25.5°C | 9.3°C | 22 mm | 81% | 3.3 m/s | 5.9 |
| 1998 | 18.2°C | 15.1°C | 12.1°C | 20.6°C | 9.9°C | 64 mm | 84% | 4.1 m/s | 4.7 |
| 1997 | 20.2°C | 16.3°C | 12.4°C | 23.9°C | 8.5°C | 38 mm | 80% | 2.9 m/s | 5.4 |
| 1996 | 19.9°C | 15.8°C | 11.7°C | 25.0°C | 7.4°C | 43 mm | 80% | 3.2 m/s | 5.5 |
| 1995 | 21.8°C | 17.7°C | 13.5°C | 27.9°C | 9.3°C | 41 mm | 80% | 3.2 m/s | 5.2 |
| 1994 | 20.8°C | 16.6°C | 12.5°C | 24.5°C | 10.5°C | 41 mm | 81% | 2.7 m/s | 5.9 |
| 1993 | 18.4°C | 15.1°C | 11.8°C | 21.6°C | 8.3°C | 84 mm | 83% | 4 m/s | 5.1 |
| 1992 | 20.1°C | 16.4°C | 12.7°C | 23.4°C | 10.2°C | 90 mm | 81% | 3.4 m/s | 4.6 |
| 1991 | 20.0°C | 16.4°C | 12.8°C | 25.0°C | 10.4°C | 77 mm | 83% | 3.7 m/s | 5 |
| 1990 | 21.6°C | 17.1°C | 12.5°C | 27.5°C | 7.7°C | 45 mm | 75% | 3.5 m/s | 5.9 |
| 1989 | 22.2°C | 17.8°C | 13.4°C | 26.8°C | 10.1°C | 56 mm | 78% | 3 m/s | 5.7 |
| 1988 ❄️ | 17.2°C | 14.3°C | 11.5°C | 20.0°C | 9.5°C | 123 mm | 85% | 4.6 m/s | 4.5 |
| 1987 | 19.6°C | 16.0°C | 12.3°C | 25.0°C | 9.2°C | 54 mm | 81% | 3.1 m/s | 4.7 |
| 1986 | 18.9°C | 15.3°C | 11.8°C | 23.3°C | 8.3°C | 53 mm | 82% | 3.4 m/s | 4.7 |
| 1985 | 19.2°C | 15.6°C | 11.9°C | 25.0°C | 9.0°C | 81 mm | 82% | 3.4 m/s | 5 |
| 1984 | 21.0°C | 16.5°C | 12.0°C | 25.1°C | 7.5°C | 32 mm | 76% | 2.8 m/s | 5.8 |
| 1983 🔥 | 23.0°C | 18.8°C | 14.5°C | 27.3°C | 9.5°C | 40 mm | 81% | 2.1 m/s | — |
| 1982 | 20.2°C | 16.2°C | 12.2°C | 23.5°C | 9.4°C | 46 mm | 81% | 3.1 m/s | — |
| 1981 | 18.8°C | 15.3°C | 11.9°C | 22.9°C | 9.6°C | 43 mm | 83% | 3.5 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 20.1°C with lows near 12.7°C (mean 16.4°C), based on 45 years of NASA POWER data.
July averages 69 mm of rainfall in Caerphilly, one of the drier months. The wettest on record was 171 mm in 2007.
The hottest July reached 30.8°C in 2006. The coldest dipped to 7.4°C in 1996.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have risen by about 0.6°C. Daytime highs moved from 20.4°C to 20.7°C and overnight lows from 12.5°C to 13.3°C over the same span.
July is one of the warmer months of the year in Caerphilly and one of the drier months, so plan for around 20.1°C daytime highs and 12.7°C at night.
Not quite — July is the 12th coolest month in Caerphilly, averaging 16.4°C.
For July in Caerphilly, pack light layers you can adjust through the day, with typical highs of 20.1°C and lows of 12.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in July averages 82% — quite humid.
Average wind speed in July is 3.3 m/s. The windiest July on record averaged 4.6 m/s (1988).
The wettest July on record was 2007 with 171 mm. On average, July sees 69 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 Caerphilly 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.
