January weather forecastIssaquah, WA
January
Weather in January
The weather in January in Issaquah, Washington is consistent with the beginning of the year. This month faces the highest levels of relative humidity, at 85%, and reduced daylight hours of 9. Erratic weather conditions prevail, combining cold temperatures, rainfall, and snowfall. On average, January has to offer 13.5 days with precipitation and 1.3 days with snowfall. This gloomy performance piece is illuminated by an average of 4.1 hours of sunshine daily.Temperature
Issaquah's weather in January displays an average high-temperature of a frosty 44.2°F (6.8°C), showing minor disparity from December's 42.3°F (5.7°C). Issaquah's nighttime temperature in January drops to an average of 34.3°F (1.3°C).Humidity
The months with the highest humidity in Issaquah are January and February, with an average relative humidity of 85%.Rainfall
In January, the rain falls for 13.5 days. Throughout January, 1.85" (47mm) of precipitation is accumulated. In Issaquah, during the entire year, the rain falls for 127.4 days and collects up to 12.52" (318mm) of precipitation.Snowfall
Months with snowfall in Issaquah are January through April, November and December. In January, in Issaquah, it is snowing for 1.3 days. Throughout January, 0.63" (16mm) of snow is accumulated. Throughout the year, there are 5.9 snowfall days, and 1.93" (49mm) of snow is accumulated.Daylight
In Issaquah, the average length of the day in January is 8h and 58min.On the first day of January, sunrise is at 7:55 am and sunset at 4:27 pm. On the last day of the month, sunrise is at 7:35 am and sunset at 5:07 pm PST.
Sunshine
In January, the average sunshine is 4.1h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: In January, the maximum UV index of 2 transforms into these recommendations:
Infants, children, and people with sensitive skin should always have protection against lengthy periods of sun exposure. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in January
Issaquah, WA
- Average high temperature in January: 44.2°F
The warmest month (with the highest average high temperature) is August (77°F).
The month with the lowest average high temperature is December (42.3°F).
- Average low temperature in January: 34.3°F
The month with the highest average low temperature is August (51.4°F).
The coldest months (with the lowest average low temperature) are February and December (33.4°F).
Average pressure in January
Issaquah, 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
Issaquah, WA
- Average wind speed in January: 5.1mph
The windiest month (with the highest average wind speed) is January (5.1mph).
The calmest month (with the lowest average wind speed) is August (3.4mph).
Average humidity in January
Issaquah, WA
- Average humidity in January: 85%
The months with the highest relative humidity are January and February (85%).
The month with the lowest relative humidity is July (69%).
Average rainfall in January
Issaquah, WA
- Average rainfall in January: 1.85"
The wettest month (with the highest rainfall) is December (2.01").
The driest month (with the least rainfall) is July (0.24").
Average rainfall days in January
Issaquah, WA
- Average rainfall days in January: 13.5 days
The month with the highest number of rainy days is March (14.8 days).
The month with the least rainy days is August (4.3 days).
Average snowfall in January
Issaquah, WA
- Average snowfall in January: 0.63"
The month with the highest snowfall is February (0.94").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in January
Issaquah, WA
- Average snowfall days in January: 1.3 days
The month with the highest number of snowfall days is February (2.5 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
Issaquah, 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 30min).
The month with the least sunshine is December (Average sunshine: 4h and 0min).
Average sunshine days in January
Issaquah, WA
- Average sunshine days in January: 15.8 days
The month with the most sunshine days is August (25 days).
The month with the least sunshine days is February (12.9 days).
Average UV index in January
Issaquah, WA
- Average UV index in January: 2
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in January
Issaquah, 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
Issaquah, WA
- Average visibility in January: 4mi
The months with the highest visibility are July and August (6mi).
The months with the lowest visibility are January, February and December (4mi).
