April is one of the warmer months of the year in Thames, with average highs near 19.3°C and lows around 14.2°C (mean 16.8°C). It is about average for rainfall, averaging 101 mm of rainfall and 80% relative humidity across the period.
April is one of the warmer months of the year in Thames. Across 45 years of records, the warmest April in Thames was 2025 — when the month averaged 18.3°C — while the coldest was 1992 at 14.2°C. Typical April days reach 19.3°C with nights near 14.2°C. The long-term trend is warming, about 0.3°C per decade.
April is about average for rainfall in Thames, averaging 101 mm of rainfall. The wettest April on record was 2025 with 250 mm, while the driest was 1994 at 23 mm.
Relative humidity in Thames during April averages 80%. The most humid April was 1995 at 86%, and the least humid was 1982 at 77%.
April receives about 3.3 kWh/m²/day of solar energy in Thames. The sunniest Aprils were 2005, 2019 and 2022 at 3.7 kWh/m²/day, and the cloudiest was 1996 at 2.8.
Average wind speed in Thames during April is 2.8 m/s. The windiest Aprils were 1987, 1991 and 2025 at 3.3 m/s, while the calmest were 2007 and 2016 at 2.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 16.4°C | 16.3°C | 16.7°C | 17.2°C | 17.3°C | +0.9°C |
| Avg High | 19.0°C | 18.9°C | 19.2°C | 19.8°C | 19.8°C | +0.8°C |
| Avg Low | 13.7°C | 13.7°C | 14.2°C | 14.6°C | 14.9°C | +1.2°C |
| Avg Rain | 112 mm | 99 mm | 82 mm | 104 mm | 119 mm | +6 mm |
April temperatures in Thames have risen by about 1.1°C between 1981–1985 and 2021–2025.
April has ranged from a record low of 7.1°C (2005) to a record high of 24.5°C (2014).
Rainfall in April is about average for rainfall, averaging 101 mm, with a wettest year of 250 mm.
A good time to visit Thames
April is a good time to visit Thames, with days averaging 19.3°C and nights around 14.2°C (mean 16.8°C, warmer than Thames's yearly average) and higher 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 🔥 🌧️ | 20.3°C | 18.3°C | 16.3°C | 22.3°C | 11.8°C | 250 mm | 85% | 3.3 m/s | 2.9 |
| 2024 | 19.2°C | 16.7°C | 14.2°C | 21.2°C | 10.1°C | 84 mm | 83% | 2.7 m/s | 3.2 |
| 2023 | 19.4°C | 17.4°C | 15.3°C | 21.8°C | 9.7°C | 152 mm | 85% | 3.2 m/s | 3 |
| 2022 | 20.1°C | 17.6°C | 15.1°C | 23.4°C | 10.7°C | 101 mm | 81% | 2.6 m/s | 3.7 |
| 2021 | 19.8°C | 17.2°C | 14.6°C | 23.0°C | 11.5°C | 92 mm | 82% | 2.7 m/s | 3.3 |
| 2020 | 19.8°C | 16.8°C | 13.8°C | 23.3°C | 10.5°C | 33 mm | 77% | 2.6 m/s | 3.6 |
| 2019 | 19.5°C | 16.6°C | 13.6°C | 21.6°C | 9.5°C | 91 mm | 78% | 2.4 m/s | 3.7 |
| 2018 | 19.9°C | 17.2°C | 14.6°C | 23.4°C | 8.7°C | 117 mm | 80% | 3.1 m/s | 3 |
| 2017 | 20.1°C | 17.8°C | 15.5°C | 24.3°C | 12.2°C | 212 mm | 84% | 2.5 m/s | 3.3 |
| 2016 | 20.1°C | 17.6°C | 15.0°C | 23.3°C | 12.2°C | 57 mm | 79% | 2.3 m/s | 3.3 |
| 2015 | 19.7°C | 17.2°C | 14.6°C | 22.5°C | 9.6°C | 81 mm | 80% | 2.9 m/s | 3.1 |
| 2014 | 20.4°C | 17.7°C | 15.0°C | 24.5°C | 10.3°C | 124 mm | 82% | 2.6 m/s | 3.3 |
| 2013 | 20.2°C | 17.7°C | 15.2°C | 23.4°C | 11.0°C | 147 mm | 80% | 2.6 m/s | 3.2 |
| 2012 | 19.5°C | 16.8°C | 14.2°C | 21.2°C | 10.8°C | 26 mm | 78% | 2.9 m/s | 3.6 |
| 2011 | 19.1°C | 16.6°C | 14.0°C | 21.4°C | 8.8°C | 149 mm | 82% | 2.9 m/s | 3.2 |
| 2010 | 19.8°C | 16.9°C | 14.1°C | 21.4°C | 10.8°C | 33 mm | 77% | 2.5 m/s | 3.5 |
| 2009 | 18.8°C | 16.3°C | 13.8°C | 21.0°C | 8.3°C | 49 mm | 78% | 2.9 m/s | 3.2 |
| 2008 | 19.6°C | 17.2°C | 14.9°C | 21.7°C | 10.1°C | 121 mm | 80% | 2.8 m/s | 3.1 |
| 2007 | 19.1°C | 16.5°C | 13.9°C | 21.6°C | 10.2°C | 56 mm | 79% | 2.3 m/s | 3.4 |
| 2006 | 19.8°C | 17.5°C | 15.3°C | 22.9°C | 12.8°C | 152 mm | 83% | 2.9 m/s | 3.1 |
| 2005 | 19.8°C | 16.6°C | 13.4°C | 22.6°C | 7.1°C | 31 mm | 77% | 2.7 m/s | 3.7 |
| 2004 | 17.9°C | 15.4°C | 12.8°C | 20.4°C | 9.7°C | 82 mm | 82% | 2.6 m/s | 3.2 |
| 2003 | 19.4°C | 16.9°C | 14.5°C | 21.8°C | 10.4°C | 72 mm | 80% | 2.5 m/s | 3.3 |
| 2002 | 19.0°C | 16.4°C | 13.7°C | 22.5°C | 9.2°C | 50 mm | 78% | 2.7 m/s | 3.3 |
| 2001 | 19.3°C | 16.8°C | 14.4°C | 21.7°C | 11.0°C | 107 mm | 78% | 2.9 m/s | 3.1 |
| 2000 | 19.7°C | 17.3°C | 14.9°C | 22.4°C | 9.4°C | 103 mm | 82% | 2.7 m/s | 3 |
| 1999 | 19.5°C | 17.3°C | 15.0°C | 23.1°C | 11.2°C | 88 mm | 80% | 3 m/s | 3.1 |
| 1998 | 20.2°C | 17.6°C | 15.0°C | 23.3°C | 11.6°C | 38 mm | 82% | 2.6 m/s | 3 |
| 1997 | 18.2°C | 15.5°C | 12.7°C | 21.8°C | 9.1°C | 65 mm | 80% | 3 m/s | 3.3 |
| 1996 | 19.5°C | 17.1°C | 14.7°C | 21.8°C | 10.3°C | 120 mm | 84% | 2.7 m/s | 2.8 |
| 1995 | 20.1°C | 17.9°C | 15.8°C | 23.2°C | 9.1°C | 211 mm | 86% | 2.6 m/s | 3.3 |
| 1994 | 19.4°C | 16.4°C | 13.5°C | 23.0°C | 7.9°C | 23 mm | 79% | 2.7 m/s | 3.3 |
| 1993 | 17.5°C | 14.9°C | 12.3°C | 20.9°C | 7.5°C | 80 mm | 82% | 2.8 m/s | 3.2 |
| 1992 ❄️ | 17.3°C | 14.2°C | 11.2°C | 22.0°C | 7.2°C | 82 mm | 77% | 2.4 m/s | 3.5 |
| 1991 | 17.7°C | 15.1°C | 12.6°C | 21.9°C | 8.5°C | 194 mm | 82% | 3.3 m/s | 3.3 |
| 1990 | 19.9°C | 17.3°C | 14.6°C | 22.5°C | 9.2°C | 83 mm | 80% | 3 m/s | 3.3 |
| 1989 | 19.4°C | 16.8°C | 14.1°C | 21.8°C | 10.2°C | 111 mm | 77% | 2.7 m/s | 3.4 |
| 1988 | 18.9°C | 16.2°C | 13.5°C | 22.7°C | 9.8°C | 30 mm | 79% | 2.8 m/s | 3.4 |
| 1987 | 18.4°C | 16.0°C | 13.5°C | 21.7°C | 9.1°C | 170 mm | 83% | 3.3 m/s | 3.3 |
| 1986 | 19.8°C | 16.9°C | 14.0°C | 22.1°C | 9.6°C | 103 mm | 79% | 2.8 m/s | 3.6 |
| 1985 | 18.1°C | 15.9°C | 13.6°C | 21.1°C | 10.9°C | 92 mm | 79% | 3.1 m/s | 3.3 |
| 1984 | 19.1°C | 16.1°C | 13.0°C | 21.9°C | 9.8°C | 65 mm | 80% | 2.5 m/s | 3.5 |
| 1983 | 18.5°C | 16.2°C | 14.0°C | 21.0°C | 9.4°C | 214 mm | 83% | 2.8 m/s | — |
| 1982 | 18.3°C | 15.5°C | 12.6°C | 21.5°C | 9.8°C | 59 mm | 77% | 2.5 m/s | — |
| 1981 | 20.7°C | 17.9°C | 15.0°C | 23.0°C | 12.5°C | 168 mm | 79% | 2.6 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 19.3°C with lows near 14.2°C (mean 16.8°C), based on 45 years of NASA POWER data.
April averages 101 mm of rainfall in Thames, about average for rainfall. The wettest on record was 250 mm in 2025.
The hottest April reached 24.5°C in 2014. The coldest dipped to 7.1°C in 2005.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have risen by about 1.1°C. Daytime highs moved from 18.9°C to 19.8°C and overnight lows from 13.6°C to 15.1°C over the same span.
April is one of the warmer months of the year in Thames and about average for rainfall, so plan for around 19.3°C daytime highs and 14.2°C at night.
Not quite — April is the 8th coolest month in Thames, averaging 16.8°C.
For April in Thames, pack light layers you can adjust through the day, with typical highs of 19.3°C and lows of 14.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in April averages 80% — quite humid.
Average wind speed in April is 2.8 m/s. The windiest April on record averaged 3.3 m/s (1987).
The wettest April on record was 2025 with 250 mm. On average, April sees 101 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 Thames 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.
