January is one of the warmer months of the year in Thames, with average highs near 22.7°C and lows around 16.3°C (mean 19.5°C). It is one of the drier months, averaging 75 mm of rainfall and 76% relative humidity across the period.
January is one of the warmer months of the year in Thames. Across 45 years of records, the warmest Januarys in Thames were 1999 and 2018 — when the month averaged 21.2°C — while the coldest was 1997 at 17.7°C. Typical January days reach 22.7°C with nights near 16.3°C. The long-term trend is warming, about 0.2°C per decade.
January is one of the drier months in Thames, averaging 75 mm of rainfall. The wettest January on record was 2023 with 448 mm, while the driest was 2013 at 8 mm.
Relative humidity in Thames during January averages 76%. The most humid January was 2023 at 83%, and the least humid was 2013 at 71%.
January receives about 6.4 kWh/m²/day of solar energy in Thames. The sunniest January was 2022 at 7.6 kWh/m²/day, and the cloudiest was 2023 at 5.
Average wind speed in Thames during January is 2.7 m/s. The windiest Januarys were 1983 and 2023 at 3.4 m/s, while the calmest was 2015 at 2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 19.5°C | 19.2°C | 19.3°C | 19.7°C | 19.9°C | +0.4°C |
| Avg High | 22.7°C | 22.4°C | 22.6°C | 22.9°C | 23.0°C | +0.3°C |
| Avg Low | 16.2°C | 16.1°C | 16.1°C | 16.4°C | 16.7°C | +0.5°C |
| Avg Rain | 88 mm | 63 mm | 58 mm | 68 mm | 118 mm | +30 mm |
January temperatures in Thames have risen by about 0.5°C between 1981–1985 and 2021–2025.
January has ranged from a record low of 9.2°C (1997) to a record high of 28.1°C (2020).
Rainfall in January is one of the drier months, averaging 75 mm, with a wettest year of 448 mm.
One of the best times to visit Thames
January is one of the best times to visit Thames. Expect days averaging 22.7°C and nights around 16.3°C (mean 19.5°C) — warmer than Thames's yearly average — with moderate rainfall (75 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 | 22.2°C | 18.9°C | 15.7°C | 25.1°C | 11.9°C | 101 mm | 75% | 3 m/s | 6.4 |
| 2024 | 23.6°C | 20.6°C | 17.7°C | 26.8°C | 13.6°C | 68 mm | 79% | 2.3 m/s | 6.3 |
| 2023 🌧️ | 21.4°C | 19.4°C | 17.4°C | 25.0°C | 15.5°C | 448 mm | 83% | 3.4 m/s | 5 |
| 2022 | 24.0°C | 20.7°C | 17.3°C | 26.8°C | 15.2°C | 30 mm | 73% | 2.5 m/s | 7.6 |
| 2021 | 23.5°C | 20.0°C | 16.5°C | 27.3°C | 14.1°C | 45 mm | 73% | 2.5 m/s | 7 |
| 2020 | 23.5°C | 19.7°C | 15.8°C | 28.1°C | 13.1°C | 14 mm | 72% | 2.6 m/s | 7.2 |
| 2019 | 24.1°C | 20.6°C | 17.1°C | 26.1°C | 14.9°C | 25 mm | 77% | 2.7 m/s | 7.1 |
| 2018 | 23.9°C | 21.2°C | 18.6°C | 26.8°C | 15.9°C | 151 mm | 82% | 2.6 m/s | 5.9 |
| 2017 | 22.2°C | 18.7°C | 15.1°C | 25.4°C | 11.6°C | 35 mm | 74% | 3.2 m/s | 6.5 |
| 2016 | 23.3°C | 20.2°C | 17.1°C | 27.3°C | 13.3°C | 98 mm | 79% | 2.5 m/s | 6.2 |
| 2015 | 23.9°C | 20.4°C | 17.0°C | 25.6°C | 15.1°C | 16 mm | 74% | 2 m/s | 7.2 |
| 2014 | 22.1°C | 18.7°C | 15.2°C | 24.6°C | 13.0°C | 38 mm | 72% | 3 m/s | 6.8 |
| 2013 | 22.7°C | 19.3°C | 15.9°C | 25.9°C | 12.9°C | 8 mm | 71% | 3 m/s | 6.9 |
| 2012 | 21.4°C | 18.5°C | 15.6°C | 24.2°C | 11.8°C | 60 mm | 77% | 3 m/s | 5.7 |
| 2011 | 23.3°C | 20.1°C | 17.0°C | 26.0°C | 15.1°C | 191 mm | 76% | 2.8 m/s | 6.3 |
| 2010 | 22.4°C | 19.0°C | 15.5°C | 24.5°C | 11.8°C | 59 mm | 75% | 2.6 m/s | 6.4 |
| 2009 | 23.4°C | 19.8°C | 16.2°C | 26.5°C | 13.7°C | 30 mm | 73% | 2.3 m/s | 7 |
| 2008 | 23.8°C | 20.4°C | 17.0°C | 26.0°C | 14.8°C | 23 mm | 74% | 2.6 m/s | 6.8 |
| 2007 | 22.3°C | 19.1°C | 16.0°C | 24.4°C | 12.1°C | 70 mm | 78% | 2.5 m/s | 5.9 |
| 2006 | 22.6°C | 19.5°C | 16.4°C | 25.9°C | 13.0°C | 87 mm | 76% | 2.9 m/s | 5.9 |
| 2005 | 21.6°C | 18.6°C | 15.5°C | 25.6°C | 13.0°C | 25 mm | 77% | 2.7 m/s | 6.8 |
| 2004 | 23.6°C | 20.1°C | 16.6°C | 26.1°C | 11.9°C | 66 mm | 77% | 2.1 m/s | 6.4 |
| 2003 | 21.7°C | 18.6°C | 15.5°C | 23.9°C | 11.4°C | 93 mm | 76% | 2.9 m/s | 6.3 |
| 2002 | 22.5°C | 19.4°C | 16.3°C | 26.2°C | 12.8°C | 63 mm | 76% | 2.5 m/s | 6.3 |
| 2001 | 22.1°C | 18.8°C | 15.6°C | 25.4°C | 12.1°C | 50 mm | 73% | 3 m/s | 6.3 |
| 2000 | 21.9°C | 18.9°C | 16.0°C | 25.3°C | 12.2°C | 74 mm | 76% | 2.5 m/s | 5.8 |
| 1999 🔥 | 24.3°C | 21.2°C | 18.1°C | 26.8°C | 15.4°C | 94 mm | 78% | 2.5 m/s | 6.2 |
| 1998 | 22.7°C | 19.2°C | 15.7°C | 26.0°C | 9.7°C | 28 mm | 76% | 2.8 m/s | 6.3 |
| 1997 ❄️ | 20.6°C | 17.7°C | 14.9°C | 23.9°C | 9.2°C | 46 mm | 75% | 3.2 m/s | 6.4 |
| 1996 | 22.4°C | 19.6°C | 16.7°C | 24.9°C | 12.8°C | 74 mm | 77% | 2.5 m/s | 6.2 |
| 1995 | 22.0°C | 19.1°C | 16.2°C | 24.7°C | 11.3°C | 79 mm | 76% | 2.7 m/s | 6.2 |
| 1994 | 23.6°C | 20.2°C | 16.9°C | 26.5°C | 11.6°C | 11 mm | 73% | 2.5 m/s | 6.5 |
| 1993 | 21.7°C | 18.2°C | 14.8°C | 23.8°C | 12.8°C | 41 mm | 75% | 3.2 m/s | 6.6 |
| 1992 | 22.1°C | 19.0°C | 15.9°C | 24.3°C | 12.5°C | 142 mm | 77% | 2.6 m/s | 6.2 |
| 1991 | 22.0°C | 18.7°C | 15.4°C | 24.7°C | 11.0°C | 38 mm | 76% | 3 m/s | 6 |
| 1990 | 22.1°C | 19.2°C | 16.2°C | 25.8°C | 14.5°C | 81 mm | 78% | 2.7 m/s | 5.7 |
| 1989 | 21.8°C | 19.6°C | 17.3°C | 24.4°C | 13.6°C | 210 mm | 82% | 3.3 m/s | 5.6 |
| 1988 | 22.5°C | 18.9°C | 15.4°C | 25.8°C | 13.9°C | 13 mm | 73% | 3 m/s | 6.8 |
| 1987 | 22.8°C | 19.7°C | 16.5°C | 25.8°C | 14.0°C | 66 mm | 75% | 3 m/s | 6.3 |
| 1986 | 23.0°C | 20.1°C | 17.2°C | 27.1°C | 13.5°C | 163 mm | 79% | 2.7 m/s | 5.8 |
| 1985 | 23.7°C | 20.4°C | 17.1°C | 25.8°C | 15.6°C | 81 mm | 75% | 2.5 m/s | 7 |
| 1984 | 21.7°C | 18.2°C | 14.8°C | 24.5°C | 11.2°C | 93 mm | 74% | 2.5 m/s | 6.5 |
| 1983 | 21.9°C | 18.2°C | 14.5°C | 27.6°C | 11.9°C | 44 mm | 71% | 3.4 m/s | — |
| 1982 | 23.1°C | 19.7°C | 16.2°C | 25.0°C | 12.7°C | 54 mm | 72% | 2.9 m/s | — |
| 1981 | 23.7°C | 20.4°C | 17.2°C | 26.1°C | 13.7°C | 64 mm | 79% | 2.4 m/s | — |
Actual recorded January data for each year, 1981–2025 — sourced from NASA POWER.
The average high in January is around 22.7°C with lows near 16.3°C (mean 19.5°C), based on 45 years of NASA POWER data.
January averages 75 mm of rainfall in Thames, one of the drier months. The wettest on record was 448 mm in 2023.
The hottest January reached 28.1°C in 2020. The coldest dipped to 9.2°C in 1997.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average January temperatures have risen by about 0.5°C. Daytime highs moved from 22.8°C to 22.9°C and overnight lows from 16°C to 16.9°C over the same span.
January is one of the warmer months of the year in Thames and one of the drier months, so plan for around 22.7°C daytime highs and 16.3°C at night.
Not quite — January is the 11th coolest month in Thames, averaging 19.5°C.
For January in Thames, pack light layers you can adjust through the day, with typical highs of 22.7°C and lows of 16.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in January averages 76% — quite humid.
Average wind speed in January is 2.7 m/s. The windiest January on record averaged 3.4 m/s (1983).
The wettest January on record was 2023 with 448 mm. On average, January sees 75 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 January, 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 January specifically, along with year-by-year records and how the month has changed over the decades.
