January is one of the warmer months of the year in Westport, with average highs near 17.9°C and lows around 10.1°C (mean 14°C). It is one of the drier months, averaging 141 mm of rainfall and 83% relative humidity across the period.
January is one of the warmer months of the year in Westport. Across 45 years of records, the warmest January in Westport was 2018 — when the month averaged 17.7°C — while the coldest was 1983 at 11.5°C. Typical January days reach 17.9°C with nights near 10.1°C. The long-term trend is warming, about 0.2°C per decade.
January is one of the drier months in Westport, averaging 141 mm of rainfall. The wettest January on record was 1991 with 360 mm, while the driest was 2009 at 32 mm.
Relative humidity in Westport during January averages 83%. The most humid January was 2007 at 87%, and the least humid was 1981 at 77%.
January receives about 6.4 kWh/m²/day of solar energy in Westport. The sunniest January was 2015 at 7.2 kWh/m²/day, and the cloudiest was 2007 at 5.6.
Average wind speed in Westport during January is 0.3 m/s. The windiest Januarys were 2014, 2017 and 2021, among others at 0.4 m/s, while the calmest were 2023, 2024 and 2025, among others at 0.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 14.0°C | 13.9°C | 13.8°C | 14.0°C | 14.7°C | +0.7°C |
| Avg High | 17.9°C | 17.8°C | 17.7°C | 17.9°C | 18.6°C | +0.7°C |
| Avg Low | 10.1°C | 10.0°C | 9.8°C | 10.2°C | 10.6°C | +0.5°C |
| Avg Rain | 166 mm | 154 mm | 134 mm | 143 mm | 92 mm | -74 mm |
January temperatures in Westport have risen by about 1.4°C between 1981–1985 and 2021–2025.
January has ranged from a record low of 1.5°C (1998) to a record high of 25.3°C (2018).
Rainfall in January is one of the drier months, averaging 141 mm, with a wettest year of 360 mm.
One of the best times to visit Westport
January is one of the best times to visit Westport. Expect days averaging 17.9°C and nights around 10.1°C (mean 14°C) — warmer than Westport's yearly average — with higher rainfall (141 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 | 18.5°C | 14.3°C | 10.1°C | 22.4°C | 5.4°C | 72 mm | 82% | 0.3 m/s | 7.1 |
| 2024 | 18.8°C | 14.7°C | 10.6°C | 23.5°C | 5.5°C | 155 mm | 83% | 0.3 m/s | 7.1 |
| 2023 | 19.9°C | 15.9°C | 11.8°C | 23.1°C | 6.8°C | 97 mm | 83% | 0.3 m/s | 6.5 |
| 2022 | 19.8°C | 15.5°C | 11.1°C | 22.9°C | 7.9°C | 42 mm | 83% | 0.3 m/s | 7 |
| 2021 | 16.9°C | 13.4°C | 9.9°C | 21.1°C | 6.4°C | 126 mm | 86% | 0.4 m/s | 6.8 |
| 2020 | 17.9°C | 14.1°C | 10.3°C | 22.1°C | 6.8°C | 60 mm | 83% | 0.3 m/s | 6.5 |
| 2019 | 19.2°C | 15.0°C | 10.9°C | 23.9°C | 6.2°C | 74 mm | 82% | 0.3 m/s | 6.9 |
| 2018 🔥 | 21.6°C | 17.7°C | 13.8°C | 25.3°C | 9.6°C | 186 mm | 84% | 0.3 m/s | 6.2 |
| 2017 | 15.3°C | 12.1°C | 8.9°C | 18.3°C | 5.2°C | 237 mm | 86% | 0.4 m/s | 5.8 |
| 2016 | 18.3°C | 14.6°C | 10.9°C | 21.7°C | 5.5°C | 198 mm | 85% | 0.3 m/s | 5.8 |
| 2015 | 19.2°C | 14.9°C | 10.7°C | 23.0°C | 7.5°C | 47 mm | 81% | 0.3 m/s | 7.2 |
| 2014 | 15.9°C | 12.3°C | 8.6°C | 20.6°C | 4.9°C | 150 mm | 84% | 0.4 m/s | 6 |
| 2013 | 17.7°C | 13.6°C | 9.5°C | 24.2°C | 5.6°C | 140 mm | 84% | 0.4 m/s | 6.4 |
| 2012 | 16.5°C | 12.7°C | 9.0°C | 19.9°C | 2.9°C | 121 mm | 83% | 0.4 m/s | 6.4 |
| 2011 | 17.7°C | 13.9°C | 10.1°C | 21.7°C | 5.9°C | 143 mm | 83% | 0.4 m/s | 6.3 |
| 2010 | 17.4°C | 13.6°C | 9.7°C | 21.7°C | 5.2°C | 135 mm | 83% | 0.4 m/s | 6.1 |
| 2009 | 18.1°C | 14.1°C | 10.1°C | 23.0°C | 6.1°C | 32 mm | 82% | 0.3 m/s | 6.8 |
| 2008 | 19.5°C | 15.0°C | 10.5°C | 22.8°C | 6.4°C | 141 mm | 83% | 0.3 m/s | 6.8 |
| 2007 | 17.1°C | 13.5°C | 10.0°C | 22.0°C | 4.1°C | 162 mm | 87% | 0.3 m/s | 5.6 |
| 2006 | 16.9°C | 12.9°C | 8.9°C | 24.0°C | 5.4°C | 139 mm | 84% | 0.4 m/s | 6.4 |
| 2005 | 17.6°C | 13.9°C | 10.2°C | 22.8°C | 7.1°C | 92 mm | 84% | 0.3 m/s | 6.2 |
| 2004 | 18.6°C | 14.7°C | 10.8°C | 21.8°C | 6.7°C | 211 mm | 84% | 0.3 m/s | 6.6 |
| 2003 | 17.3°C | 13.2°C | 9.0°C | 22.8°C | 2.8°C | 157 mm | 83% | 0.3 m/s | 6.5 |
| 2002 | 18.0°C | 14.3°C | 10.6°C | 22.6°C | 6.5°C | 148 mm | 85% | 0.4 m/s | 6.6 |
| 2001 | 16.7°C | 12.6°C | 8.4°C | 21.1°C | 4.5°C | 99 mm | 81% | 0.4 m/s | 7 |
| 2000 | 17.5°C | 13.7°C | 9.9°C | 20.5°C | 5.5°C | 161 mm | 83% | 0.3 m/s | 6.2 |
| 1999 | 20.6°C | 16.1°C | 11.7°C | 23.9°C | 7.3°C | 81 mm | 81% | 0.3 m/s | 6.5 |
| 1998 | 17.4°C | 13.7°C | 9.9°C | 21.2°C | 1.5°C | 80 mm | 84% | 0.3 m/s | 6.2 |
| 1997 | 17.5°C | 13.5°C | 9.5°C | 22.0°C | 4.4°C | 80 mm | 82% | 0.3 m/s | 6.5 |
| 1996 | 19.1°C | 15.0°C | 11.0°C | 22.1°C | 4.2°C | 104 mm | 82% | 0.3 m/s | 6.4 |
| 1995 | 18.0°C | 14.0°C | 10.1°C | 22.8°C | 3.1°C | 126 mm | 82% | 0.3 m/s | 6.6 |
| 1994 | 17.4°C | 13.7°C | 10.1°C | 20.0°C | 5.0°C | 274 mm | 83% | 0.4 m/s | 6 |
| 1993 | 15.5°C | 11.8°C | 8.2°C | 18.9°C | 5.0°C | 186 mm | 84% | 0.4 m/s | 6 |
| 1992 | 17.8°C | 13.7°C | 9.6°C | 21.6°C | 3.8°C | 90 mm | 82% | 0.4 m/s | 6.3 |
| 1991 🌧️ | 17.0°C | 13.4°C | 9.7°C | 21.5°C | 4.9°C | 360 mm | 86% | 0.3 m/s | 5.7 |
| 1990 | 17.6°C | 13.7°C | 9.8°C | 22.0°C | 6.6°C | 159 mm | 83% | 0.4 m/s | 6.2 |
| 1989 | 19.9°C | 15.9°C | 12.0°C | 23.8°C | 6.8°C | 193 mm | 83% | 0.3 m/s | 6.5 |
| 1988 | 18.0°C | 13.8°C | 9.7°C | 21.7°C | 6.0°C | 70 mm | 82% | 0.3 m/s | 6.5 |
| 1987 | 18.4°C | 14.4°C | 10.3°C | 22.4°C | 5.9°C | 304 mm | 84% | 0.4 m/s | 6.5 |
| 1986 | 18.8°C | 15.2°C | 11.5°C | 23.0°C | 6.6°C | 245 mm | 85% | 0.4 m/s | 6.3 |
| 1985 | 17.9°C | 14.2°C | 10.6°C | 23.2°C | 7.0°C | 195 mm | 85% | 0.4 m/s | 6.2 |
| 1984 | 16.2°C | 12.3°C | 8.5°C | 20.8°C | 2.8°C | 110 mm | 82% | 0.4 m/s | 6.4 |
| 1983 ❄️ | 14.8°C | 11.5°C | 8.2°C | 20.9°C | 3.9°C | 198 mm | 86% | 0.4 m/s | — |
| 1982 | 17.0°C | 13.1°C | 9.3°C | 22.4°C | 5.4°C | 126 mm | 84% | 0.4 m/s | — |
| 1981 | 20.4°C | 15.7°C | 11.0°C | 24.9°C | 6.2°C | 52 mm | 77% | 0.3 m/s | — |
Actual recorded January data for each year, 1981–2025 — sourced from NASA POWER.
The average high in January is around 17.9°C with lows near 10.1°C (mean 14°C), based on 45 years of NASA POWER data.
January averages 141 mm of rainfall in Westport, one of the drier months. The wettest on record was 360 mm in 1991.
The hottest January reached 25.3°C in 2018. The coldest dipped to 1.5°C in 1998.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average January temperatures have risen by about 1.4°C. Daytime highs moved from 17.3°C to 18.8°C and overnight lows from 9.5°C to 10.7°C over the same span.
January is one of the warmer months of the year in Westport and one of the drier months, so plan for around 17.9°C daytime highs and 10.1°C at night.
Not quite — January is the 11th coolest month in Westport, averaging 14°C.
For January in Westport, pack light layers you can adjust through the day, with typical highs of 17.9°C and lows of 10.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in January averages 83% — quite humid.
Average wind speed in January is 0.3 m/s. The windiest January on record averaged 0.4 m/s (1982).
The wettest January on record was 1991 with 360 mm. On average, January sees 141 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 Westport 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.
