January weather forecastRenton, WA

January

Weather in January

In Renton, Washington, January is characterized by chilly temperatures and high humidity levels. Following the chill of December, this month offers an insignificant increase in tangible warmth, where the temperature range fluctuates between a high of 45°F (7.2°C) and a low of 35.2°F (1.8°C). Skies in January often bear gray shades with cloud cover accounting for 58% of the sky, resulting in minimal sunlight exposure of only 4.1 hours daily. This month experiences a strong prevalence of fog and drizzle, which is evident from the average visibility of 5 mi. A slight reduction in wind speed makes the inescapable dampness and cold slightly more bearable.

Temperature

In January, Renton experiences a minor shift in meteorological conditions with average high-temperatures marked at a still chilly 45°F (7.2°C), closely mirroring the climate in December. Nighttime temperature experiences an average drop to an icy 35.2°F (1.8°C) in January.

Humidity

January and December, with an average relative humidity of 85%, are the most humid months.

Rainfall

In Renton, during January, the rain falls for 10.8 days and regularly aggregates up to 1.14" (29mm) of precipitation. Throughout the year, in Renton, there are 100.6 rainfall days, and 7.6" (193mm) of precipitation is accumulated.

Snowfall

January through March, November and December are months with snowfall in Renton. In Renton, in January, snow falls for 1.2 days, with typically accumulated 0.31" (8mm) of snow. Throughout the year, there are 4.9 snowfall days, and 1.18" (30mm) of snow is accumulated.

Daylight

The average length of the day in January in Renton is 8h and 58min.
On the first day of the month, sunrise is at 7:56 am and sunset at 4:28 pm. On the last day of January, in Renton, sunrise is at 7:36 am and sunset at 5:08 pm PST.

Sunshine

January and December, with an average of 4.1h of sunshine, are months with the least sunshine.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Renton. A UV Index reading of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: In January, an average UV index of 2 transforms into the following instructions:
Children must always have sun protection, unlike most people, who can tolerate up to an hour in the sun without any burns. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. Always opt for UVA and UVB-resistant sunglasses on radiant days. Take note! UV radiation from the Sun can double in intensity due to snow reflection.

Updated: Feb 14, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

The high-temperature, in January, in Renton, records 45°F (7.2°C), while the low-temperature is 35.2°F (1.8°C).

January and December, with an average relative humidity of 85%, are most humid months in Renton.

In Renton, Washington, the average relative humidity in January is 85%.

In Renton, in January, during 10.8 rainfall days, 1.14" (29mm) of precipitation is typically accumulated.

In Renton, during January, snow falls for 1.2 days and regularly aggregates up to 0.31" (8mm) of snow.

The average day length in January in Renton is 8h and 58min.

On the first day of January in Renton, Washington, sunrise is at 7:56 am and sunset at 4:28 pm. On the last day of the month, sunrise is at 7:36 am and sunset at 5:08 pm PST.

The months with the least sunshine in Renton are January and December, with an average of 4.1h of sunshine.

In January, the average sunshine duration in Renton, Washington, is 4.1h.

The months with the lowest UV index in Renton are January, February, November and December, with an average maximum UV index of 2.

In January, the average daily maximum UV index in Renton, Washington, is 2. A UV Index of 2, and less, symbolizes a low health threat from exposure to Sun's UV rays.

Today

Tomorrow

Long-term

Year January F M A M J J A S O N D

Dec

January

Feb

Average high temperature

43.3°F

45°F

46°F

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

5mph

5.5mph

5.4mph

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

Average daylight

Average sunshine

Average sunshine days

17.1

15.5

Average UV index

Average cloud cover

58%

57%

Average visibility

5mi

Average temperature in January
Renton, WA

Average high temperature in January: 45°F

The warmest months (with the highest average high temperature) are July and August (77.4°F).
The month with the lowest average high temperature is December (43.3°F).

Average low temperature in January: 35.2°F

The month with the highest average low temperature is August (53.6°F).
The coldest month (with the lowest average low temperature) is December (34.2°F).

Average pressure in January
Renton, WA

Average pressure in January: 30.1"Hg

The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).

Average wind speed in January
Renton, WA

Average wind speed in January: 5mph

The windiest month (with the highest average wind speed) is March (5.2mph).
The calmest month (with the lowest average wind speed) is August (3.6mph).

Average humidity in January
Renton, WA

Average humidity in January: 85%

The months with the highest relative humidity are January and December (85%).
The months with the lowest relative humidity are July and August (68%).

Average rainfall in January
Renton, WA

Average rainfall in January: 1.14"

The wettest month (with the highest rainfall) is December (1.34").
The driest month (with the least rainfall) is July (0.12").

Average rainfall days in January
Renton, WA

Average rainfall days in January: 10.8 days

The month with the highest number of rainy days is March (11.9 days).
The month with the least rainy days is August (3 days).

Average snowfall in January
Renton, WA

Average snowfall in January: 0.31"

The month with the highest snowfall is February (0.63").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in January
Renton, WA

Average snowfall days in January: 1.2 days

The month with the highest number of snowfall days is February (1.7 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight in January /
Average sunshine in January
Renton, WA

Average daylight in January: 9h and 0min

The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).

Average sunshine in January: 4h and 6min

The month with the most sunshine is August (Average sunshine: 10h and 36min).
The months with the least sunshine are January and December (Average sunshine: 4h and 6min).

Average sunshine days in January
Renton, WA

Average sunshine days in January: 17.1 days

The month with the most sunshine days is August (25.8 days).
The month with the least sunshine days is February (15.5 days).

Average UV index in January
Renton, WA

Average UV index in January: 2

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in January
Renton, WA

Average cloud cover in January: 58

The months with the most cloud cover are January and December (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 27).

Average visibility in January
Renton, WA

Average visibility in January: 5mi

The months with the highest visibility are June, July, August and September (6mi).
The months with the lowest visibility are January, February, March, April, May, October, November and December (5mi).