Weather Forecast for San Juan Islands

Washington, United States of America

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Current Weather - San Juan Islands: 11°C

Washington, United States of America

Clear

Feels like 11°C

Wind

4 km/h NNW

Humidity

89%

Pressure

1023 mb

UV Index

0

Visibility

16 km

Sunny

Sunny

Saturday, June 13, 2026

High

25°C

Low

13°C

Rain Chance

5%

Hourly Forecast

Sunny 23°C
12:00
Sunny 24°C
13:00
Sunny 22°C
14:00
Sunny 20°C
15:00
Partly Cloudy 20°C
16:00
Partly Cloudy 19°C
17:00
Sunny 19°C
18:00
Sunny 18°C
19:00
Sunny 17°C
20:00
Partly Cloudy 17°C
21:00
Clear 16°C
22:00
Clear 16°C
23:00
Jun 14

Day Statistics

Maximum Wind

10 km/h

Humidity

65%

Precipitation

0 mm

UV Index

8

Visibility

10 km

Rain Chance

5%

Snow Chance

0%

Sun & Moon

Sunrise

05:09 AM

Sunset

09:14 PM

Moonrise

03:12 AM

Moonset

08:08 PM

Moon Phase

New Moon

Moon Illumination

1%

Air Quality

PM2.5

15.9

μg/m³

PM10

21.3

μg/m³

NO₂

17.6

μg/m³

O₃

76.1

μg/m³

SO₂

4.6

μg/m³

CO

119

μg/m³

US EPA Index: 2 GB DEFRA Index: 2

Weather Alerts

Heat Advisory issued June 12 at 3:11PM PDT until June 16 at 5:00AM PDT by NWS Seattle WA

San Juan County; Island County Jun 12, 03:11 PM - Jun 12, 11:00 PM
Severity: Moderate Urgency: Expected

* WHAT...Hot conditions with high temperatures up to 80 to 85 degrees and low temperatures down to 55 to 60 degrees expected. This will pose a moderate risk of heat-related illness. * WHERE...Island County and San Juan County. * WHEN...From 11 AM Sunday to 5 AM PDT Tuesday. * IMPACTS...Heat will significantly increase the risk of heat-related illnesses for those who are sensitive to heat, especially those without effective cooling or adequate hydration.

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. For sheltering information and other human services in your area, dial 2 1 1 during business hours or visit wa211.org anytime.

Event: Heat Advisory Certainty: Likely Category: Met

Heat Advisory issued June 12 at 9:02PM PDT until June 16 at 5:00AM PDT by NWS Seattle WA

San Juan County; Island County Jun 12, 09:02 PM - Jun 13, 05:30 AM
Severity: Moderate Urgency: Expected

* WHAT...Hot conditions with high temperatures up to 80 to 85 degrees and low temperatures down to 55 to 60 degrees expected. This will pose a moderate risk of heat-related illness. * WHERE...Island County and San Juan County. * WHEN...From 11 AM Sunday to 5 AM PDT Tuesday. * IMPACTS...Heat will significantly increase the risk of heat-related illnesses for those who are sensitive to heat, especially those without effective cooling or adequate hydration.

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances. Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose fitting clothing when possible. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. For sheltering information and other human services in your area, dial 2 1 1 during business hours or visit wa211.org anytime.

Event: Heat Advisory Certainty: Likely Category: Met