Mercer Island, Washington, United States Climate Change Severity

52
High
The current climate change severity in Mercer Island is High, with a 2.8% 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 Jan. (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 +27.6%, and has experienced notable climate changes.

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

Comparison of Weather Condition (Historic Vs 2026)

HistoricDays

Year 2026Days

Change

sunnySunny
43
-25%
cloudyCloudy
65
-16.6%
rainyRainy
186
-66.6%
snowySnowy
00
0%
mistyMisty
04
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

+1.3 °C

Variation in annual rainfall

-17.7 %

Change in average humidity

-0.3 %

PM2.5 levels surged by

+6.3 %

Heatwave changed by

-0.4 day(s)

Coldwave changed by

-2.3 day(s)

Wind speeds changed by

-4.5 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 Jan.

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

Condition
Temperature IconTemperature
Humidity IconHumi.
Wind IconWind Speed
Thu. 19, Feb.
patchy rain possiblePatchy rain nearby
Temperature Icon5°/-2°
Humidity Icon76%
Wind Icon17km/h
Fri. 20, Feb.
partly cloudyPartly Cloudy
Temperature Icon4°/0°
Humidity Icon73%
Wind Icon10km/h
Sat. 21, Feb.
overcastOvercast
Temperature Icon9°/3°
Humidity Icon62%
Wind Icon6km/h
Sun. 22, Feb.
moderate rainModerate rain
Temperature Icon10°/2°
Humidity Icon78%
Wind Icon9km/h
Mon. 23, Feb.
moderate rainModerate rain
Temperature Icon10°/5°
Humidity Icon94%
Wind Icon19km/h
Tue. 24, Feb.
mistMist
Temperature Icon9°/3°
Humidity Icon85%
Wind Icon5km/h
Wed. 25, Feb.
moderate rainModerate rain
Temperature Icon8°/5°
Humidity Icon91%
Wind Icon17km/h
Thu. 26, Feb.
patchy rain possiblePatchy rain nearby
Temperature Icon9°/5°
Humidity Icon83%
Wind Icon31km/h
Fri. 27, Feb.
patchy rain possiblePatchy rain nearby
Temperature Icon8°/2°
Humidity Icon77%
Wind Icon16km/h
Sat. 28, Feb.
patchy rain possiblePatchy rain nearby
Temperature Icon6°/3°
Humidity Icon94%
Wind Icon13km/h
Sun. 1, Mar.
patchy rain possiblePatchy rain nearby
Temperature Icon9°/4°
Humidity Icon87%
Wind Icon8km/h
Mon. 2, Mar.
sunnySunny
Temperature Icon10°/1°
Humidity Icon78%
Wind Icon11km/h
Tue. 3, Mar.
sunnySunny
Temperature Icon11°/1°
Humidity Icon79%
Wind Icon12km/h
Wed. 4, Mar.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon10°/2°
Humidity Icon78%
Wind Icon14km/h
Thu. 5, Mar.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon10°/2°
Humidity Icon79%
Wind Icon16km/h
Fri. 6, Mar.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon9°/2°
Humidity Icon80%
Wind Icon13km/h
Sat. 7, Mar.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon9°/2°
Humidity Icon82%
Wind Icon14km/h
Sun. 8, Mar.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon10°/2°
Humidity Icon81%
Wind Icon13km/h
Mon. 9, Mar.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon10°/2°
Humidity Icon80%
Wind Icon17km/h
Tue. 10, Mar.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon10°/2°
Humidity Icon78%
Wind Icon17km/h
Wed. 11, Mar.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon10°/3°
Humidity Icon79%
Wind Icon16km/h
Thu. 12, Mar.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon11°/3°
Humidity Icon81%
Wind Icon16km/h
Fri. 13, Mar.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon10°/3°
Humidity Icon84%
Wind Icon17km/h
Sat. 14, Mar.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon10°/4°
Humidity Icon81%
Wind Icon19km/h
Sun. 15, Mar.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon11°/4°
Humidity Icon81%
Wind Icon18km/h
Mon. 16, Mar.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon11°/3°
Humidity Icon80%
Wind Icon16km/h
Tue. 17, Mar.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon11°/2°
Humidity Icon79%
Wind Icon12km/h
Wed. 18, Mar.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon12°/3°
Humidity Icon77%
Wind Icon12km/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 Icon16km/h
Sat. 21, Mar.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon11°/4°
Humidity Icon83%
Wind Icon15km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onThu. 19, Mar.

12.8°C

Low will be onThu. 19, Feb.

-2°C

HumidityHumidity

High will be onMon. 23, Feb.

94%

Low will be onSat. 21, Feb.

62%

Wind SpeedWind Speed

High will be onThu. 26, Feb.

30.6km/h

Low will be onTue. 24, Feb.

5km/h

PrecipitationPrecipitation

High will be onMon. 23, Feb.

15.8mm

Low will be onTue. 24, Feb.

0.01mm

Ultraviolet IndexUV

High will be onTue. 3, Mar.

3

Low will be onFri. 27, Feb.

1

Our Blogs

14 Feb 2026

Mumbai Air Quality Comparison of 2025 Vs 2026 (Jan-Feb)

Mumbai Air Quality Comparison of 2025 Vs 2026 (Jan-Feb)
12 Feb 2026

Why AQI Standards Vary Across the World – And Why Air Quality Index Matters More Than Ever

Why AQI Standards Vary Across the World – And Why Air Quality Index Matters More Than Ever
2 Feb 2026

Why Winter Suffocates and Monsoon Saves Delhi Air Quality 2025?

Why Winter Suffocates and Monsoon Saves Delhi Air Quality 2025?
1 Feb 2026

Winter vs Summer Air: Why Air Pollution Behaves So Differently Across Seasons

Winter vs Summer Air: Why Air Pollution Behaves So Differently Across Seasons
29 Jan 2026

Shocking Air Quality Data Reveals Hazardous Pollution in Baramulla’s Khawaja Bagh, Shattering the ‘Clean Air’ Myth of Jammu & Kashmir

Shocking Air Quality Data Reveals Hazardous Pollution in Baramulla’s Khawaja Bagh, Shattering the ‘Clean Air’ Myth of Jammu & Kashmir
28 Jan 2026

What hourly AQI reveals : Rainfall’s Limited Impact on Delhi NCR’s Air Quality

What hourly AQI reveals : Rainfall’s Limited Impact on Delhi NCR’s Air Quality
26 Dec 2025

Delhi’s Air in 2025: A Year Where Clean Days Never Arrived

Delhi’s Air in 2025: A Year Where Clean Days Never Arrived
19 Dec 2025

Delhi Engulfed in Fog and Toxic Air: Dense Fog Reduces Visibility as AQI Remains Severe, IMD Issues Yellow Alert

Delhi Engulfed in Fog and Toxic Air: Dense Fog Reduces Visibility as AQI Remains Severe, IMD Issues Yellow Alert
16 Dec 2025

GRAP Stage 4 Enforced in Delhi as AQI Touches 600+: Smog and Weather Worsen Air Quality

GRAP Stage 4 Enforced in Delhi as AQI Touches 600+: Smog and Weather Worsen Air Quality
13 Dec 2025

Sudden Smog Rise Across Delhi NCR Linked to Low Wind and Temperature Inversion

Sudden Smog Rise Across Delhi NCR Linked to Low Wind and Temperature Inversion