January Weather in Porterville, United States

Last updated: June 24, 2025

In January, the average temperature in Porterville, United States hovers around 10°C (51°F). During this month, you can expect temperatures to dip as low as -1°C (30°F), while highs can reach a pleasant 23°C (74°F). With an average humidity of 78% and approximately 76 mm (3.0 in) of precipitation spread over 7 days, be prepared for a mix of cozy and refreshing weather!

January Temperature in Porterville

In January in Porterville, the average temperature is 10°C (51°F). Maximums can reach 23°C (74°F), and minimums can drop as low as -1°C (30°F). This range makes it essential to pack layers for a comfortable visit, ensuring you're prepared for both warm days and chillier nights.

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

The chart illustrates January temperature patterns in Porterville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Porterville, January typically has an average temperature of 10°C (51°F), with highs reaching up to 23°C (74°F) and lows dropping to around -1°C (30°F).

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

January Precipitation in Porterville

In Porterville in January, the precipitation amount is 76 mm (3.0 in) over a period of 7 days.

January Precipitation Trends in Porterville

The chart displays monthly precipitation patterns in Porterville, 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 Porterville, January typically receives around 76 mm (3.0 inches) of precipitation spread over approximately 7 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 Porterville

In Porterville in January, humidity is 78%. With an average temperature of 10°C (51°F), this humidity feels like a cool, damp mist enveloping you, making travel feel somewhat brisk and invigorating, yet slightly uncomfortable for prolonged outdoor activities.

January Average Humidity in Porterville

This chart illustrates the average monthly humidity levels in Porterville, 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 Porterville is approximately 78%, 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 Porterville

In Porterville in January, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Porterville for better planning.

Maximum UV Index Levels in Porterville for January

The chart shows the monthly maximum UV Index (UVI) for Porterville 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 Porterville typically reaches 4, which falls under the moderate exposure category.

Data source: Porterville 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 Porterville Compares to Other Months

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

This table compares monthly weather conditions in Porterville, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	10°C (51°F)	76 mm (3.0 inches)	78%	moderate
February Weather	11°C (52°F)	78 mm (3.1 inches)	82%	moderate
March Weather	13°C (56°F)	108 mm (4.3 inches)	75%	very high
April Weather	17°C (63°F)	43 mm (1.7 inches)	68%	very high
May Weather	21°C (69°F)	26 mm (1.0 inches)	57%	very high
June Weather	26°C (80°F)	1 mm (0.0 inches)	52%	extreme
July Weather	30°C (87°F)	0 mm (0.0 inches)	46%	extreme
August Weather	30°C (86°F)	0 mm (0.0 inches)	39%	very high
September Weather	26°C (79°F)	2 mm (0.1 inches)	48%	very high
October Weather	20°C (68°F)	11 mm (0.4 inches)	59%	high
November Weather	14°C (58°F)	37 mm (1.5 inches)	72%	moderate
December Weather	10°C (51°F)	75 mm (2.9 inches)	76%	moderate