Mercer Island, Washington, United States Climate Change Severity

52
High
The current climate change severity in Mercer Island is High, with a 17.1% worsening in the climate score compared to last 16 years. This suggests deteriorating conditions, with increasing negative impacts on weather patterns and environmental conditions.
Data: Jan. to Feb. (Historical Vs 2026) - Weather Data Only
Low
020
Moderate
40
High
60
Very High
80
Extreme
100
°C (c)

Mercer Island Weather Condition Changes (Historic Vs 2026)

2026
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Historic
2026

Over the past 16 year(s), Mercer Island temperature has changed by around +31.7%, and has experienced notable climate changes.

Sunny
Cloudy
Rainy
Snowy
Misty
Data: Jan. to Feb. (Historical Vs 2026)

Comparison of Weather Condition (Historic Vs 2026)

HistoricDays

Year 2026Days

Change

sunnySunny
63
-50%
cloudyCloudy
119
-18.1%
rainyRainy
3511
-68.5%
snowySnowy
10
-100%
mistyMisty
012
100%

Disclaimer: Other weather conditions not shown may affect the total day count.

Climate Change Indicators:

Over the past 16 years, Mercer Island has experienced measurable shifts in key climate parameters, contributing to the current severity score of 52 (within the High severity category). This suggests worsening climate conditions from the previous years. Here’s a breakdown of the specific changes observed:

Severity Score

52/100

High

Low
020
Moderate
40
High
60
Very High
80
Extreme
100

From 2010 to 2025, Mercer Island experienced significant changes:

Temperature change of

+1 °C

Variation in annual rainfall

-19.6 %

Change in average humidity

-1.5 %

PM2.5 levels surged by

+2.8 %

Heatwave changed by

-0.8 day(s)

Coldwave changed by

-4.6 day(s)

Wind speeds changed by

-3.9 km/h

These indicators show that Mercer Island is experiencing a more volatile and extreme climate, reinforcing the need for urgent intervention to mitigate risks. As the severity score rises, focus must shift to adaptation and emergency preparedness.

Check how we calculate Climate Change Severity
Based on data from Jan. to Feb.

Mercer Island Weather Forecast 30 Days (March - April 2026)
Mercer Island, Washington, United States

Condition
Temperature IconTemperature
Humidity IconHumi.
Wind IconWind Speed
Thu. 5, Mar.
patchy rain possiblePatchy rain nearby
Temperature Icon10°/6°
Humidity Icon91%
Wind Icon10.4km/h
Fri. 6, Mar.
heavy rainHeavy rain
Temperature Icon10°/6°
Humidity Icon95%
Wind Icon6.1km/h
Sat. 7, Mar.
patchy rain possiblePatchy rain nearby
Temperature Icon10°/8°
Humidity Icon92%
Wind Icon15.8km/h
Sun. 8, Mar.
patchy rain possiblePatchy rain nearby
Temperature Icon10°/6°
Humidity Icon88%
Wind Icon16.9km/h
Mon. 9, Mar.
patchy rain possiblePatchy rain nearby
Temperature Icon9°/3°
Humidity Icon80%
Wind Icon15.1km/h
Tue. 10, Mar.
patchy rain possiblePatchy rain nearby
Temperature Icon8°/1°
Humidity Icon79%
Wind Icon8.3km/h
Wed. 11, Mar.
moderate rainModerate rain
Temperature Icon3°/2°
Humidity Icon94%
Wind Icon35.6km/h
Thu. 12, Mar.
patchy rain possiblePatchy rain nearby
Temperature Icon7°/1°
Humidity Icon79%
Wind Icon25.6km/h
Fri. 13, Mar.
patchy rain possiblePatchy rain nearby
Temperature Icon8°/0°
Humidity Icon76%
Wind Icon7.6km/h
Sat. 14, Mar.
patchy rain possiblePatchy rain nearby
Temperature Icon5°/1°
Humidity Icon92%
Wind Icon19.1km/h
Sun. 15, Mar.
patchy rain possiblePatchy rain nearby
Temperature Icon7°/2°
Humidity Icon88%
Wind Icon18.7km/h
Mon. 16, Mar.
patchy rain possiblePatchy rain nearby
Temperature Icon6°/0°
Humidity Icon85%
Wind Icon20.5km/h
Tue. 17, Mar.
moderate rainModerate rain
Temperature Icon7°/0°
Humidity Icon96%
Wind Icon21.6km/h
Wed. 18, Mar.
moderate rainModerate rain
Temperature Icon10°/4°
Humidity Icon95%
Wind Icon26.3km/h
Thu. 19, Mar.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon13°/3°
Humidity Icon75%
Wind Icon14km/h
Fri. 20, Mar.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon12°/4°
Humidity Icon79%
Wind Icon15.5km/h
Sat. 21, Mar.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon11°/4°
Humidity Icon83%
Wind Icon14.8km/h
Sun. 22, Mar.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon11°/4°
Humidity Icon83%
Wind Icon14.8km/h
Mon. 23, Mar.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon11°/3°
Humidity Icon79%
Wind Icon15.8km/h
Wed. 25, Mar.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon12°/4°
Humidity Icon81%
Wind Icon14.4km/h
Thu. 26, Mar.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon12°/5°
Humidity Icon81%
Wind Icon13.7km/h
Fri. 27, Mar.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon13°/5°
Humidity Icon82%
Wind Icon15.1km/h
Sat. 28, Mar.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon11°/5°
Humidity Icon83%
Wind Icon18.4km/h
Sun. 29, Mar.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon12°/4°
Humidity Icon82%
Wind Icon14.4km/h
Mon. 30, Mar.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon12°/4°
Humidity Icon80%
Wind Icon15.1km/h
Tue. 31, Mar.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon13°/4°
Humidity Icon78%
Wind Icon13km/h
Wed. 1, Apr.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon12°/4°
Humidity Icon80%
Wind Icon14km/h
Thu. 2, Apr.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon12°/4°
Humidity Icon78%
Wind Icon13.7km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onThu. 19, Mar.

13°C

Low will be onThu. 19, Mar.

3°C

HumidityHumidity

High will be onTue. 17, Mar.

96%

Low will be onThu. 19, Mar.

75%

Wind SpeedWind Speed

High will be onWed. 11, Mar.

35.6km/h

Low will be onFri. 6, Mar.

6.1km/h

PrecipitationPrecipitation

High will be onFri. 6, Mar.

23.3mm

Low will be onFri. 13, Mar.

0.5mm

Ultraviolet IndexUV

High will be onFri. 6, Mar.

2

Low will be onTue. 10, Mar.

1

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