January Weather in Portland, Australia

Last updated: August 22, 2025

In Portland, Australia, the average temperature in January hovers around 18°C (64°F). This month sees a minimum of 12°C (53°F) and can spike to a maximum of 35°C (95°F). You can expect about 32 mm (1.3 in) of precipitation over 4 days, with the air holding an average humidity level of 76%.

January Temperature in Portland

In January in Portland, the average temperature is 18°C (64°F). Maximums can reach 35°C (95°F) and minimums can dip as low as 12°C (53°F). It’s a great time for travelers to enjoy a mix of warm days and cooler evenings.

January Weather in Portland: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Portland, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Portland, January typically has an average temperature of 18°C (64°F), with highs reaching up to 35°C (95°F) and lows dropping to around 12°C (53°F).

Data source: Temperature data for Portland generated using information from the Copernicus Climate Change Service.

January Precipitation in Portland

In Portland in January, the total precipitation amount is 32 mm (1.3 in), accumulated over a period of 4 days.

January Precipitation Trends in Portland

The chart displays monthly precipitation patterns in Portland, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Portland, January typically receives around 32 mm (1.3 inches) of precipitation spread over approximately 4 days.

Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

January Humidity in Portland

In Portland in January, humidity is 76%. With an average temperature of 18°C (64°F), this humidity feels like a warm blanket wrapping around you, making outdoor activities feel steamy and invigorating—perfect for exploring charming streets, though you might want to take breaks in the shade.

January Average Humidity in Portland

This chart illustrates the average monthly humidity levels in Portland, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Portland is approximately 76%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Portland

In Portland in January, the maximum UV index reaches 13, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. For detailed information, you can check the Hourly UV Index in Portland.

Maximum UV Index Levels in Portland for January

The chart shows the monthly maximum UV Index (UVI) for Portland in January, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In January, the maximum UV index in Portland typically reaches 13, which falls under the extreme exposure category.

Data source: Portland January UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How January Weather in Portland Compares to Other Months

Weather in Portland varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Portland, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Portland, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	18°C (64°F)	32 mm (1.3 inches)	76%	extreme
February Weather	17°C (63°F)	31 mm (1.2 inches)	75%	extreme
March Weather	17°C (63°F)	35 mm (1.4 inches)	76%	very high
April Weather	15°C (60°F)	51 mm (2.0 inches)	76%	high
May Weather	13°C (56°F)	92 mm (3.6 inches)	79%	moderate
June Weather	11°C (53°F)	81 mm (3.2 inches)	78%	moderate
July Weather	11°C (52°F)	122 mm (4.8 inches)	78%	moderate
August Weather	11°C (52°F)	113 mm (4.4 inches)	77%	moderate
September Weather	12°C (54°F)	86 mm (3.4 inches)	76%	high
October Weather	13°C (56°F)	74 mm (2.9 inches)	76%	very high
November Weather	15°C (59°F)	68 mm (2.7 inches)	76%	extreme
December Weather	16°C (61°F)	44 mm (1.7 inches)	76%	extreme