San Juan Island, WA Weather Forecast and Current Conditions

WEATHER ALERTS - Wind Advisory - Special Weather Statement

Current Conditions From Nearby Local Station

Clear 45°F
Feels Like 45°F  
Humidity 94% Dew Point 43°F Wind Calm Barometer 29.88 in.
Report from a personal weather station 0.5 mi. E of central San Juan Island
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Point Forecast at a Glance

MonDec 15
Mon Dec 15: Rain, Low 42F
30%
 
42
TueDec 16
Tue Dec 16: Rain, High 52F, Low 40F
100%
52
40
WedDec 17
Wed Dec 17: Rain Likely, High 48F, Low 39F
70%
48
39
ThuDec 18
Thu Dec 18: Rain, High 50F, Low 37F
100%
50
37
FriDec 19
Fri Dec 19: Rain Likely, High 46F, Low 37F
50%
46
37
SatDec 20
Sat Dec 20: Rain, High 46F, Low 36F
50%
46
36
SunDec 21
Sun Dec 21: Rain, High 47F, Low 38F
50%
47
38

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7-Day Temperature Trend

Week Ahead Summary

High temperatures remain relatively stable through the week, ranging from 46°F to 52°F. Unsettled weather expected with rain likely on at least 7 days.

Climate Context

This week's forecast shows temperatures running 3°F above the historical average for December. Normal highs for this period are around 45°F with lows around 36°F.

This Date in Weather History

1835 - New England experienced one of their coldest days of record. At noon on that bitterly cold Wednesday the mercury stood at four degrees below at Boston, 15 degrees below at Norfolk CT, and 17 degrees below at Hanover NH. The temperature at Boston was 12 degrees below zero by sunset. Gale force winds accompanied the severe cold, and that night a great New York City fire destroyed much of the financial district.

More on this and other weather history

San Juan Island, WA 7 Day Weather Forecast Details

Monday Dec 15

Rain

Night: A 30 percent chance of rain, mainly after 5am. Partly cloudy, with a low around 42. South southeast wind around 6 mph.

Tuesday Dec 16

Rain

Day: Rain. Patchy fog after 3pm. High near 52. South southeast wind 8 to 11 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

Rain

Night: Rain, mainly before midnight. Patchy fog before 9pm. Low around 40. Windy, with a south wind 14 to 19 mph becoming west southwest 28 to 33 mph in the evening. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

Wednesday Dec 17

Rain Likely

Day: Rain likely. Mostly cloudy, with a high near 48. West southwest wind 7 to 14 mph, with gusts as high as 20 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

Rain

Night: Rain. Low around 39. South southeast wind around 8 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

Thursday Dec 18

Rain

Day: Rain. High near 50. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

Rain Likely

Night: Rain likely, mainly before 10pm. Mostly cloudy, with a low around 37. Chance of precipitation is 70%.

Friday Dec 19

Rain Likely

Day: Rain likely. Mostly cloudy, with a high near 46.

Rain

Night: Rain. Mostly cloudy, with a low around 37.

Saturday Dec 20

Rain

Day: Rain. Mostly cloudy, with a high near 46.

Rain

Night: A chance of rain. Mostly cloudy, with a low around 36.

Sunday Dec 21

Rain

Day: A chance of rain. Mostly cloudy, with a high near 47.

Snow

Night: Rain likely, possibly mixed with snow. Mostly cloudy, with a low around 38.

Monday Dec 22

Snow

Day: Rain likely, possibly mixed with snow. Mostly cloudy, with a high near 47.

How We Provide Better Local Weather

Current conditions: We use the nearest available station to your location - including professional MESONET/MADIS and local weather stations - often miles closer than regional airports.

Forecasts: National Weather Service point forecasts predict for your specific area, not broad regional zones, making them far more relevant to your location.