July is one of the cooler months of the year in Horsham, with average highs near 13.5°C and lows around 4.2°C (mean 8.9°C). It is a relatively wet time of year, averaging 51 mm of rainfall and 83% relative humidity across the period.
July is one of the cooler months of the year in Horsham. Across 45 years of records, the warmest July in Horsham was 1988 — when the month averaged 9.9°C — while the coldest were 1982 and 1995 at 7.7°C. Typical July days reach 13.5°C with nights near 4.2°C. The long-term trend is warming, about 0.2°C per decade.
July is a relatively wet time of year in Horsham, averaging 51 mm of rainfall. The wettest July on record was 2021 with 94 mm, while the driest was 1982 at 12 mm.
Relative humidity in Horsham during July averages 83%. The most humid July was 1995 at 89%, and the least humid was 2002 at 75%.
July receives about 2.3 kWh/m²/day of solar energy in Horsham. The sunniest July was 1985 at 2.6 kWh/m²/day, and the cloudiest was 1984 at 1.8.
Average wind speed in Horsham during July is 2.9 m/s. The windiest Julys were 2011, 2016 and 2018, among others at 3.3 m/s, while the calmest were 1982, 2010 and 2020 at 2.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 8.3°C | 8.7°C | 9.1°C | 9.2°C | 9.0°C | +0.7°C |
| Avg High | 12.8°C | 13.3°C | 13.9°C | 13.7°C | 13.8°C | +1°C |
| Avg Low | 3.7°C | 4.1°C | 4.3°C | 4.6°C | 4.1°C | +0.4°C |
| Avg Rain | 56 mm | 51 mm | 43 mm | 52 mm | 53 mm | -3 mm |
July temperatures in Horsham have risen by about 0.9°C between 1981–1985 and 2021–2025.
July has ranged from a record low of -3.7°C (1982) to a record high of 20.9°C (2017).
Rainfall in July is a relatively wet time of year, averaging 51 mm, with a wettest year of 94 mm.
A quieter season to visit Horsham
If your dates are flexible, the more temperate months of February and January tend to be the most comfortable for visiting Horsham. That said, July — with days averaging 13.5°C and nights around 4.2°C (mean 8.9°C) and moderate rainfall (51 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 | 13.8°C | 9.1°C | 4.3°C | 17.5°C | 1.6°C | 79 mm | 81% | 3.1 m/s | 2.4 |
| 2024 | 14.1°C | 9.1°C | 4.1°C | 17.5°C | 0.0°C | 56 mm | 81% | 2.9 m/s | 2.5 |
| 2023 | 14.2°C | 9.5°C | 4.8°C | 18.0°C | 0.8°C | 37 mm | 85% | 2.7 m/s | 2.4 |
| 2022 | 14.1°C | 8.9°C | 3.8°C | 19.3°C | 0.1°C | 25 mm | 81% | 2.8 m/s | 2.4 |
| 2021 🌧️ | 13.0°C | 8.6°C | 4.2°C | 17.2°C | 0.1°C | 94 mm | 83% | 3.1 m/s | 2.2 |
| 2020 | 13.8°C | 8.6°C | 3.5°C | 17.9°C | 0.4°C | 26 mm | 85% | 2.2 m/s | 2.5 |
| 2019 | 14.3°C | 9.7°C | 5.1°C | 18.2°C | 1.1°C | 55 mm | 83% | 3.1 m/s | 2.3 |
| 2018 | 14.0°C | 9.0°C | 4.0°C | 18.7°C | -1.1°C | 59 mm | 77% | 3.3 m/s | 2.4 |
| 2017 | 14.0°C | 9.1°C | 4.1°C | 20.9°C | -1.1°C | 57 mm | 80% | 2.9 m/s | 2.5 |
| 2016 | 13.7°C | 9.6°C | 5.4°C | 19.7°C | 1.4°C | 57 mm | 83% | 3.3 m/s | 2.1 |
| 2015 | 12.7°C | 7.9°C | 3.1°C | 15.9°C | -1.9°C | 21 mm | 80% | 3 m/s | 2.2 |
| 2014 | 13.3°C | 9.0°C | 4.6°C | 17.0°C | 0.7°C | 50 mm | 86% | 3.2 m/s | 2.2 |
| 2013 | 13.9°C | 9.7°C | 5.4°C | 17.6°C | 0.1°C | 68 mm | 85% | 2.9 m/s | 2.1 |
| 2012 | 13.6°C | 9.2°C | 4.7°C | 15.9°C | -0.6°C | 52 mm | 86% | 2.7 m/s | 2.2 |
| 2011 | 13.9°C | 9.3°C | 4.7°C | 19.0°C | 1.3°C | 50 mm | 82% | 3.3 m/s | 2.3 |
| 2010 | 13.5°C | 9.0°C | 4.4°C | 17.7°C | 0.2°C | 56 mm | 84% | 2.2 m/s | 2.2 |
| 2009 | 13.7°C | 9.1°C | 4.5°C | 18.1°C | 0.0°C | 53 mm | 83% | 3.2 m/s | 2.3 |
| 2008 | 13.2°C | 8.5°C | 3.9°C | 15.6°C | 0.4°C | 59 mm | 81% | 3 m/s | 2.2 |
| 2007 | 13.2°C | 8.6°C | 4.0°C | 19.3°C | -0.7°C | 50 mm | 84% | 2.9 m/s | 2.4 |
| 2006 | 13.9°C | 9.0°C | 4.1°C | 17.2°C | 0.7°C | 38 mm | 81% | 2.8 m/s | 2.4 |
| 2005 | 14.4°C | 9.5°C | 4.7°C | 18.3°C | -0.3°C | 29 mm | 84% | 2.5 m/s | 2.3 |
| 2004 | 12.9°C | 8.4°C | 4.0°C | 16.6°C | 0.6°C | 40 mm | 82% | 3 m/s | 2.2 |
| 2003 | 14.2°C | 9.1°C | 4.0°C | 17.7°C | 0.4°C | 36 mm | 81% | 2.9 m/s | 2.4 |
| 2002 | 15.1°C | 9.4°C | 3.7°C | 19.4°C | -0.2°C | 28 mm | 75% | 3.1 m/s | 2.4 |
| 2001 | 14.5°C | 9.8°C | 5.2°C | 18.4°C | 2.0°C | 41 mm | 82% | 2.3 m/s | 2.3 |
| 2000 | 13.8°C | 9.3°C | 4.7°C | 18.4°C | 1.4°C | 58 mm | 81% | 2.9 m/s | 2.3 |
| 1999 | 14.8°C | 9.7°C | 4.7°C | 17.9°C | 1.6°C | 31 mm | 80% | 2.6 m/s | 2.3 |
| 1998 | 12.6°C | 8.2°C | 3.8°C | 16.1°C | -0.2°C | 52 mm | 82% | 2.6 m/s | 2.3 |
| 1997 | 13.6°C | 8.2°C | 2.8°C | 17.5°C | 0.4°C | 15 mm | 79% | 2.4 m/s | 2.4 |
| 1996 | 12.4°C | 8.2°C | 4.1°C | 17.7°C | -1.2°C | 85 mm | 87% | 3 m/s | 2 |
| 1995 | 11.4°C | 7.7°C | 3.9°C | 14.5°C | 0.3°C | 83 mm | 89% | 3.1 m/s | 2.2 |
| 1994 | 14.5°C | 9.0°C | 3.4°C | 19.9°C | -1.3°C | 26 mm | 79% | 2.6 m/s | 2.5 |
| 1993 | 14.1°C | 9.3°C | 4.5°C | 18.4°C | 0.5°C | 69 mm | 80% | 2.7 m/s | 2.3 |
| 1992 | 13.3°C | 8.7°C | 4.2°C | 16.3°C | -1.3°C | 30 mm | 83% | 3 m/s | 2.5 |
| 1991 | 12.9°C | 8.5°C | 4.0°C | 15.8°C | 1.0°C | 52 mm | 87% | 2.7 m/s | 2.2 |
| 1990 | 13.5°C | 9.3°C | 5.1°C | 18.6°C | 1.8°C | 69 mm | 84% | 3.2 m/s | 2.3 |
| 1989 | 12.2°C | 8.0°C | 3.9°C | 16.0°C | -0.6°C | 56 mm | 87% | 3 m/s | 2.3 |
| 1988 🔥 | 14.1°C | 9.9°C | 5.7°C | 17.0°C | 3.0°C | 49 mm | 86% | 3 m/s | 2.2 |
| 1987 | 13.1°C | 8.5°C | 3.9°C | 17.3°C | 1.3°C | 44 mm | 84% | 2.8 m/s | 2.5 |
| 1986 | 12.0°C | 7.8°C | 3.6°C | 15.1°C | -0.8°C | 94 mm | 87% | 2.9 m/s | 2.3 |
| 1985 | 13.8°C | 8.5°C | 3.2°C | 19.8°C | -2.8°C | 23 mm | 79% | 3 m/s | 2.6 |
| 1984 | 12.2°C | 7.9°C | 3.6°C | 16.4°C | -1.1°C | 70 mm | 85% | 2.8 m/s | 1.8 |
| 1983 | 12.3°C | 7.8°C | 3.2°C | 15.4°C | -2.6°C | 65 mm | 86% | 2.7 m/s | — |
| 1982 ❄️ | 13.1°C | 7.7°C | 2.2°C | 16.1°C | -3.7°C | 12 mm | 79% | 2.2 m/s | — |
| 1981 | 12.8°C | 8.4°C | 4.0°C | 16.2°C | 1.2°C | 91 mm | 85% | 3.3 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 13.5°C with lows near 4.2°C (mean 8.9°C), based on 45 years of NASA POWER data.
July averages 51 mm of rainfall in Horsham, a relatively wet time of year. The wettest on record was 94 mm in 2021.
The hottest July reached 20.9°C in 2017. The coldest dipped to -3.7°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have risen by about 0.9°C. Daytime highs moved from 12.8°C to 13.8°C and overnight lows from 3.2°C to 4.2°C over the same span.
July is one of the cooler months of the year in Horsham and a relatively wet time of year, so plan for around 13.5°C daytime highs and 4.2°C at night.
Yes — July is the coldest month of the year in Horsham, averaging 8.9°C.
For July in Horsham, pack warm layers and a jacket for chilly mornings, with typical highs of 13.5°C and lows of 4.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in July averages 83% — quite humid.
Average wind speed in July is 2.9 m/s. The windiest July on record averaged 3.3 m/s (1981).
The wettest July on record was 2021 with 94 mm. On average, July sees 51 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 Horsham 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.
