Bukit Mertajam weather in January
In January, Bukit Mertajam has daytime highs averaging 30 °C, nights around 23 °C, with 20 wet days, and a sea temperature of 29 °C. Figures are 1991–2020 climate normals.
- 29.6°C Average high
- 22.9°C Average low
- 20days Wet days
- 168mm Rainfall
- 29.3°C Sea temperature
- 12h Daylight
Daily temperatures through January
How January develops
Averages for the first, middle and last part of the month, from daily 1991–2020 normals. Chance of rain is the share of years in which that calendar day recorded more than 1 mm.
| Days | Avg high | Avg low | Chance of rain |
|---|---|---|---|
| 1–10 January | 29.4 °C | 22.9 °C | 66 % |
| 11–20 January | 29.5 °C | 22.9 °C | 70 % |
| 21–31 January | 30.0 °C | 22.8 °C | 57 % |
- Rain is most likely over days 11–20 of January (70 % of days) and least likely over days 21–31 (57 %).
What to expect
| Measure | Typical January | Share of the month |
|---|---|---|
| Days above 25 °C | 31 of 31 | 100 % |
| Days above 30 °C | 11 of 31 | 35 % |
| Days below 0 °C | 0 of 31 | 0 % |
| Days with more than 1 mm rain | 20 of 31 | 64 % |
Conditions in January
| Measure | Average |
|---|---|
| Mean temperature | 26 °C |
| Record high (1991–2020) | 33 °C |
| Record low (1991–2020) | 18 °C |
| Relative humidity | 82 % |
| Wind speed | 8.6 km/h |
| Cloud cover | 74 % |
Where Bukit Mertajam ranks in January
| Ranking | Position | Value |
|---|---|---|
| Warmest sea temperatures in Asia in January | 11thof 50 | 29 °C |
| Warmest sea temperatures in the world in January | 15thof 50 | 29 °C |
January compared with the months around it
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| January | 29.6 °C | 168 mm | 74 % |
| February | 30.5 °C | 131 mm | 69 % |
| March | 30.7 °C | 199 mm | 73 % |
| November | 28.8 °C | 368 mm | 88 % |
| December | 28.9 °C | 259 mm | 83 % |
See all twelve months for Bukit Mertajam
- January is the 8th warmest month here.
- It is the 4th driest month of the year.
- It ranks 3rd for least cloud cover.
- Days last about 12 hours from sunrise to sunset.
- It rains on 20 of 31 days — 64 % of the month.
- Nights are about 6.8 °C cooler than the middle of the day.
- The hottest January day on record since 1991 reached 33 °C, 3.7 °C above the usual daytime high.
- Beach score: 66 / 100 — see how this is calculated.
Nearby destinations in January
| Destination | Avg high | Wet days | Sea |
|---|---|---|---|
| Bukit Mertajam | 30 °C | 20 | 29 |
| Kulim | 30 °C | 20 | – |
| George Town | 29 °C | 15 | 29 |
| Paya Terubong | 29 °C | 15 | 29 |
| Kota Kuala Muda | 30 °C | 15 | 29 |
| Sungai Petani | 30 °C | 12 | 29 |
| Taiping | 29 °C | 23 | 29 |
| Alor Setar | 31 °C | 8 | 28 |
QuestionsJanuary in Bukit Mertajam, answered
How warm is Bukit Mertajam in January?
Daily highs average 30 °C and nights fall to about 23 °C, a spread of 6.8 °C between afternoon and dawn. That makes January the 9th warmest month of the year here.
Does it rain much in Bukit Mertajam in January?
January averages 168 mm of rain, spread over about 20 of the 31 days — 64 % of the month. Cloud cover averages 74 % of the sky.
Is the sea warm enough to swim in January?
The sea averages 29 °C off Bukit Mertajam in January. Most people find water below 20 °C bracing and above 25 °C comfortable for a long swim; this figure is a monthly surface average, so a sheltered bay on a still afternoon can be warmer.
How long are the days in January?
Bukit Mertajam averages 12 hours between sunrise and sunset in January. Day length is computed from latitude and date, so it is exact rather than modelled — but it says nothing about how much of that time is sunny.
Data sources and method
- ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
- Open-Meteo — Open-Meteo.com. CC BY 4.0
- NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
- GeoNames — GeoNames.org. CC BY 4.0
- Normal period
- 1991–2020
- Dataset version
- era5-1991-2020-scores1.1
- Last processed
Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: daylight hours, beach and comfort scores, monthly rankings, threshold day counts, chance of a wet day by date, ten-day averages within the month. Full formulas are on the methodology page.
Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.