April is close to Horsham's year-round average, with average highs near 22.6°C and lows around 9.4°C (mean 16°C). It is one of the drier months, averaging 27 mm of rainfall and 63% relative humidity across the period.
April is close to Horsham's year-round average. Across 45 years of records, the warmest April in Horsham was 2025 — when the month averaged 18.9°C — while the coldest was 1995 at 13.2°C. Typical April days reach 22.6°C with nights near 9.4°C. The long-term trend is warming, about 0.2°C per decade.
April is one of the drier months in Horsham, averaging 27 mm of rainfall. The wettest April on record was 2020 with 80 mm, while the driest was 1999 at 1 mm.
Relative humidity in Horsham during April averages 63%. The most humid April was 2011 at 72%, and the least humid was 1993 at 50%.
April receives about 4 kWh/m²/day of solar energy in Horsham. The sunniest April was 1999 at 4.6 kWh/m²/day, and the cloudiest were 2020 and 2022 at 3.5.
Average wind speed in Horsham during April is 2.9 m/s. The windiest April was 1986 at 3.6 m/s, while the calmest was 2002 at 2.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 15.9°C | 15.3°C | 16.3°C | 16.5°C | 16.0°C | +0.1°C |
| Avg High | 22.7°C | 21.9°C | 23.1°C | 22.9°C | 22.1°C | -0.6°C |
| Avg Low | 9.2°C | 8.7°C | 9.5°C | 10.1°C | 9.8°C | +0.6°C |
| Avg Rain | 21 mm | 26 mm | 24 mm | 27 mm | 42 mm | +21 mm |
April temperatures in Horsham have risen by about 0.7°C between 1981–1985 and 2021–2025.
April has ranged from a record low of 1.9°C (2009) to a record high of 36.1°C (1985).
Rainfall in April is one of the drier months, averaging 27 mm, with a wettest year of 80 mm.
A good time to visit Horsham
April is a good time to visit Horsham, with days averaging 22.6°C and nights around 9.4°C (mean 16°C, close to Horsham's yearly average) and low rainfall. February and January are marginally more temperate, but April still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 🔥 | 25.2°C | 18.9°C | 12.6°C | 32.7°C | 7.4°C | 23 mm | 59% | 2.9 m/s | 4 |
| 2024 | 21.0°C | 14.8°C | 8.5°C | 27.9°C | 5.4°C | 44 mm | 71% | 2.8 m/s | 3.7 |
| 2023 | 21.4°C | 15.5°C | 9.6°C | 26.4°C | 5.7°C | 50 mm | 71% | 2.8 m/s | 3.6 |
| 2022 | 23.1°C | 17.0°C | 10.9°C | 29.2°C | 7.3°C | 36 mm | 66% | 3 m/s | 3.5 |
| 2021 | 21.8°C | 15.2°C | 8.6°C | 32.3°C | 2.0°C | 18 mm | 67% | 2.5 m/s | 3.9 |
| 2020 🌧️ | 20.1°C | 14.4°C | 8.6°C | 25.4°C | 5.1°C | 80 mm | 71% | 3.2 m/s | 3.5 |
| 2019 | 23.7°C | 16.9°C | 10.1°C | 32.8°C | 5.0°C | 8 mm | 56% | 2.9 m/s | 3.9 |
| 2018 | 25.3°C | 18.2°C | 11.1°C | 36.0°C | 6.6°C | 19 mm | 58% | 2.7 m/s | 4.2 |
| 2017 | 22.5°C | 16.5°C | 10.6°C | 29.5°C | 6.0°C | 65 mm | 65% | 2.9 m/s | 3.8 |
| 2016 | 24.3°C | 17.5°C | 10.7°C | 30.9°C | 6.5°C | 12 mm | 55% | 3 m/s | 4 |
| 2015 | 20.8°C | 14.6°C | 8.4°C | 29.1°C | 4.3°C | 22 mm | 67% | 3 m/s | 3.7 |
| 2014 | 22.0°C | 16.1°C | 10.2°C | 33.6°C | 4.4°C | 57 mm | 68% | 2.9 m/s | 3.6 |
| 2013 | 23.2°C | 16.9°C | 10.6°C | 30.2°C | 5.7°C | 12 mm | 60% | 2.8 m/s | 3.9 |
| 2012 | 23.2°C | 16.4°C | 9.6°C | 32.0°C | 5.2°C | 13 mm | 61% | 2.7 m/s | 4 |
| 2011 | 21.7°C | 15.1°C | 8.6°C | 27.4°C | 6.3°C | 18 mm | 72% | 2.7 m/s | 4 |
| 2010 | 22.7°C | 16.7°C | 10.8°C | 28.8°C | 5.2°C | 46 mm | 71% | 2.9 m/s | 3.6 |
| 2009 | 22.0°C | 15.5°C | 8.9°C | 32.1°C | 1.9°C | 28 mm | 60% | 3 m/s | 4.1 |
| 2008 | 21.8°C | 15.2°C | 8.5°C | 28.2°C | 3.1°C | 12 mm | 61% | 2.9 m/s | 3.8 |
| 2007 | 24.6°C | 17.7°C | 10.9°C | 30.0°C | 7.4°C | 51 mm | 58% | 2.9 m/s | 4.2 |
| 2006 | 19.9°C | 13.8°C | 7.6°C | 27.4°C | 4.1°C | 39 mm | 65% | 3.2 m/s | 3.7 |
| 2005 | 26.1°C | 18.6°C | 11.1°C | 34.4°C | 6.8°C | 12 mm | 51% | 3.2 m/s | 4.4 |
| 2004 | 23.4°C | 16.5°C | 9.5°C | 34.7°C | 5.7°C | 9 mm | 59% | 3.1 m/s | 4 |
| 2003 | 23.3°C | 16.4°C | 9.5°C | 28.9°C | 5.2°C | 16 mm | 65% | 2.9 m/s | 4 |
| 2002 | 24.8°C | 17.6°C | 10.4°C | 30.6°C | 5.0°C | 16 mm | 58% | 2.4 m/s | 4.2 |
| 2001 | 22.1°C | 15.5°C | 8.9°C | 30.6°C | 4.6°C | 11 mm | 62% | 3.1 m/s | 4.1 |
| 2000 | 22.6°C | 16.2°C | 9.8°C | 28.5°C | 4.6°C | 45 mm | 67% | 2.9 m/s | 4 |
| 1999 | 21.8°C | 14.8°C | 7.9°C | 27.4°C | 3.3°C | 1 mm | 62% | 2.6 m/s | 4.6 |
| 1998 | 20.7°C | 14.3°C | 7.8°C | 31.1°C | 4.9°C | 68 mm | 65% | 2.8 m/s | 3.8 |
| 1997 | 23.3°C | 16.1°C | 9.0°C | 29.8°C | 4.7°C | 3 mm | 55% | 2.7 m/s | 4.1 |
| 1996 | 19.8°C | 13.9°C | 7.9°C | 25.5°C | 3.5°C | 19 mm | 71% | 3.4 m/s | 3.6 |
| 1995 ❄️ | 19.4°C | 13.2°C | 7.1°C | 27.0°C | 3.8°C | 70 mm | 68% | 3.5 m/s | 3.9 |
| 1994 | 23.1°C | 16.3°C | 9.5°C | 30.7°C | 4.7°C | 6 mm | 56% | 3.1 m/s | 4 |
| 1993 | 24.8°C | 17.3°C | 9.8°C | 31.4°C | 6.3°C | 1 mm | 50% | 2.7 m/s | 4.4 |
| 1992 | 22.2°C | 15.8°C | 9.4°C | 33.2°C | 2.4°C | 50 mm | 67% | 2.9 m/s | 4 |
| 1991 | 21.4°C | 15.0°C | 8.7°C | 29.5°C | 3.1°C | 22 mm | 62% | 2.7 m/s | 4.1 |
| 1990 | 22.9°C | 16.5°C | 10.2°C | 28.6°C | 5.5°C | 20 mm | 66% | 3.5 m/s | 4.2 |
| 1989 | 22.7°C | 16.4°C | 10.1°C | 29.3°C | 5.5°C | 25 mm | 70% | 2.7 m/s | 3.9 |
| 1988 | 23.7°C | 16.9°C | 10.0°C | 27.2°C | 6.1°C | 7 mm | 65% | 3.2 m/s | 4 |
| 1987 | 23.7°C | 16.6°C | 9.5°C | 31.2°C | 3.1°C | 16 mm | 55% | 3.1 m/s | 4.2 |
| 1986 | 22.3°C | 15.6°C | 8.9°C | 35.0°C | 4.2°C | 36 mm | 60% | 3.6 m/s | 4 |
| 1985 | 23.3°C | 16.8°C | 10.3°C | 36.1°C | 5.6°C | 23 mm | 61% | 3.2 m/s | 4.1 |
| 1984 | 21.6°C | 14.7°C | 7.8°C | 26.3°C | 4.5°C | 17 mm | 68% | 2.9 m/s | 4.1 |
| 1983 | 19.2°C | 13.3°C | 7.4°C | 24.8°C | 2.7°C | 38 mm | 71% | 3 m/s | — |
| 1982 | 23.0°C | 16.0°C | 9.1°C | 31.1°C | 4.3°C | 19 mm | 59% | 2.8 m/s | — |
| 1981 | 24.4°C | 17.2°C | 10.0°C | 31.4°C | 3.8°C | 5 mm | 58% | 3 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 22.6°C with lows near 9.4°C (mean 16°C), based on 45 years of NASA POWER data.
April averages 27 mm of rainfall in Horsham, one of the drier months. The wettest on record was 80 mm in 2020.
The hottest April reached 36.1°C in 1985. The coldest dipped to 1.9°C in 2009.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have risen by about 0.7°C. Daytime highs moved from 22.3°C to 22.5°C and overnight lows from 8.9°C to 10°C over the same span.
April is close to Horsham's year-round average and one of the drier months, so plan for around 22.6°C daytime highs and 9.4°C at night.
Not quite — April is the 7th coolest month in Horsham, averaging 16°C.
For April in Horsham, pack light layers you can adjust through the day, with typical highs of 22.6°C and lows of 9.4°C.
Relative humidity in April averages 63% — moderately humid.
Average wind speed in April is 2.9 m/s. The windiest April on record averaged 3.6 m/s (1986).
The wettest April on record was 2020 with 80 mm. On average, April sees 27 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 April, 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 April specifically, along with year-by-year records and how the month has changed over the decades.
