Mercer Island, WA Weather Forecast & Alerts

Current conditions, 5-day forecast, and active NWS weather alerts for Mercer Island, WA.

0 Currently Active Alerts for Mercer Island

✅
No active weather alerts for Mercer Island at this time.
Subscribe to receive instant notifications when alerts are issued.

Current Conditions — Mercer Island, WA

EVERETT (KPAE)

Clear

46.4 F
Humidity:53%
Wind Speed:E 5.7 mph
Barometer:29.95 in
Dewpoint:30.2 F
Visibility:10.00 mi
Precip:--
Heat Index:NA
Wind Chill:43.5 F
Apr 25 2026, 07:40 AM PDT
Severe Weather Alerts
Severe Weather
 		Daily Weather Forecast
Daily Forecast
 		Observation Alert Monitoring
Observations
 		Storm Report Monitoring
Storm Reports

5-Day Forecast — Mercer Island, WA

Saturday

High 64 °F
Forecast Missing
Saturday
Night
Low 44 °F
Forecast Missing
Sunday

High 68 °F
Forecast Missing
Sunday
Night
Low 46 °F
Forecast Missing
Monday

High 62 °F
Forecast Missing
Monday
Night
Low 48 °F
Forecast Missing
Tuesday

High 64 °F
Forecast Missing
Tuesday
Night
Low 46 °F
Forecast Missing
Wednesday

High 68 °F
Forecast Missing

Detailed Forecast — Mercer Island, WA

Saturday
Forecast Missing. High near 64°F. Wind 2 to 9 mph, with gusts as high as 14 mph.
Saturday Night
Forecast Missing. Low around 44°F. Wind 1 to 5 mph, with gusts as high as 9 mph.
Sunday
Forecast Missing. High near 68°F. Wind 1 to 6 mph, with gusts as high as 8 mph.
Sunday Night
Forecast Missing. Low around 46°F. Wind 3 to 5 mph, with gusts as high as 8 mph.
Monday
Forecast Missing. High near 62°F. Wind 6 to 8 mph, with gusts as high as 14 mph.
Monday Night
Forecast Missing. Low around 48°F. Wind 3 to 5 mph, with gusts as high as 8 mph.
Tuesday
Forecast Missing. High near 64°F. Wind 3 to 5 mph, with gusts as high as 7 mph.
Tuesday Night
Forecast Missing. Low around 46°F. Wind around 1 mph, with gusts as high as 3 mph.
Wednesday
Forecast Missing. High near 68°F. Wind 5 to 7 mph, with gusts as high as 9 mph.
Wednesday Night
Forecast Missing. Low around 48°F. Wind 1 to 2 mph, with gusts as high as 5 mph.
Thursday
Forecast Missing. High near 73°F. Wind 3 to 6 mph, with gusts as high as 8 mph.
Thursday Night
Forecast Missing. Low around 50°F. Wind 1 to 2 mph, with gusts as high as 5 mph.
Friday
Forecast Missing. High near 69°F. Wind 3 to 6 mph, with gusts as high as 8 mph.
WA Radar
Current Radar • WA
Day 1 Outlook • April 25, 2026

Observation History — Mercer Island, WA

Time Wind
(mph)		 Vis
(mi)		 Weather Precip (in) Temperature (F) Relative
Humidity		 Wind
Chill
(F)		 Heat
Index
(F)		 Pressure
Air Dwpt altimeter
(in)		 sea level
(mb)
07:40 AM PDT E 5.7 10.00 Clear -- 46.4 30.2 53% 43.5 NA 29.95 1014.2
07:35 AM PDT E 6.9 10.00 Clear -- 46.4 30.2 53% 43.0 NA 29.95 1014.2
07:30 AM PDT E 6.9 10.00 Clear -- 46.4 30.2 53% 43.0 NA 29.95 1014.2
07:25 AM PDT E 5.7 10.00 Clear -- 44.6 30.2 57% 41.4 NA 29.95 1014.2
07:15 AM PDT E 9.2 10.00 Clear -- 44.6 30.2 57% 39.7 NA 29.95 1014.2
07:10 AM PDT E 8.1 10.00 Clear -- 44.6 30.2 57% 40.1 NA 29.95 1014.2
07:00 AM PDT E 9.2 10.00 Clear -- 44.6 30.2 57% 39.7 NA 29.95 1014.2
06:50 AM PDT E 8.1 10.00 Clear -- 42.8 30.2 61% 37.9 NA 29.95 1014.2
06:40 AM PDT E 3.4 10.00 Clear -- 42.8 30.2 61% 41.0 NA 29.95 1014.2
06:35 AM PDT E 3.4 10.00 Clear -- 42.8 30.2 61% 41.0 NA 29.95 1014.2
06:25 AM PDT E 3.4 10.00 Clear -- 42.8 30.2 61% 41.0 NA 29.95 1014.2
06:20 AM PDT 0.0 10.00 Clear -- 42.8 30.2 61% NA NA 29.95 1014.2
06:10 AM PDT 0.0 10.00 Clear -- 42.8 30.2 61% NA NA 29.95 1014.2
06:00 AM PDT 0.0 10.00 Clear -- 41.0 30.2 65% NA NA 29.95 1014.2
05:50 AM PDT 0.0 10.00 Clear -- 41.0 30.2 65% NA NA 29.95 1014.2
05:45 AM PDT 4.6 10.00 Clear -- 42.8 30.2 61% 40.1 NA 29.95 1014.2
05:35 AM PDT 6.9 10.00 Clear -- 42.8 30.2 61% 38.5 NA 29.95 1014.2
05:30 AM PDT 5.7 10.00 Clear -- 42.8 30.2 61% 39.2 NA 29.95 1014.2
05:25 AM PDT E 6.9 10.00 Clear -- 42.8 30.2 61% 38.5 NA 29.95 1014.2
05:10 AM PDT 0.0 10.00 Clear -- 42.8 30.2 61% NA NA 29.95 1014.2
05:05 AM PDT E 3.4 10.00 Clear -- 42.8 30.2 61% 41.0 NA 29.95 1014.2
05:00 AM PDT 0.0 10.00 Clear -- 42.8 30.2 61% NA NA 29.95 1014.2
04:50 AM PDT E 4.6 10.00 Clear -- 42.8 30.2 61% 40.1 NA 29.95 1014.2
04:40 AM PDT 4.6 10.00 Clear -- 42.8 30.2 61% 40.1 NA 29.95 1014.2

Regional Weather Observation

EVERETT (KPAE)

Clear
46.4 F

SEATTLE/BOEING (KBFI)

Clear
44.6 F

RENTON (KRNT)

Clear
42.8 F

SEATTLE/METRO (KSEA)

Clear
46.4 F

BREMERTON NTNL (KPWT)

Clear
44.6 F

TACOMA (KTIW)

Clear
44.6 F
🔔    Sign-up to receive daily weather forecasts by email or text - subscribe