Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average snowfall in January
- Average snowfall days in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
Weather in January
Temperature
Issaquah observes a minor difference in average high-temperatures between December's 42.3°F (5.7°C) and January's 44.2°F (6.8°C). Issaquah, in January, observes a steady average low-temperature of 34.3°F (1.3°C).Humidity
The months with the highest humidity are January and February, with an average relative humidity of 85%.Rainfall
In Issaquah, in January, it is raining for 13.5 days, with typically 1.85" (47mm) of accumulated precipitation. 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 Issaquah, during January, snow falls for 1.3 days and regularly aggregates up to 0.63" (16mm) of snow. In Issaquah, during the entire year, snow falls for 5.9 days and aggregates up to 1.93" (49mm) of snow.Daylight
In January, the average length of the day is 8h and 58min.On the first day of the month, sunrise is at 7:55 am and sunset at 4:27 pm. On the last day of January, in Issaquah, sunrise is at 7:35 am and sunset at 5:07 pm PST.
Sunshine
In Issaquah, Washington, the average sunshine in January is 4.1h.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the ordinary person.Note: An average maximum UV index of 2 in January leads to these recommendations:
Most people face no serious problems with extended sun exposure, but those with fair skin, infants, and children always need protection. When the Sun is at its strongest around midday, find shade and limit exposure. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. Bear in mind! The Sun's UV radiation can nearly double in intensity due to the reflective quality of snow.
Frequently asked questions
Is January cold in Issaquah?
What is the most humid month in Issaquah?
What is the average humidity in January in Issaquah?
How many days does it rain in January in Issaquah?
How many days does it snow in January in Issaquah?
What is the average length of the day in January in Issaquah?
When are sunrise and sunset in January in Issaquah?
How many hours of sunshine does Issaquah have in January?
What is the month with the lowest UV index in Issaquah?
What is the UV index intensity in January in Issaquah?
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 1min
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).
Issaquah, Washington, USA
Weather forecast for your location
2. Allow the app to use your location