Half Moon Bay, California, United States Climate Change Severity

52
High
The current climate change severity in Half Moon Bay is High, with a 5.7% 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 Jul. (Historical Vs 2026) - Weather Data Only
Low
020
Moderate
40
High
60
Very High
80
Extreme
100
°C

Half Moon Bay 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), Half Moon Bay temperature has changed by around +1.3%, and has experienced notable climate changes.

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

Comparison of Weather Condition (Historic Vs 2026)

HistoricDays

Year 2026Days

Change

sunnySunny
6833
-51.4%
cloudyCloudy
7227
-62.5%
rainyRainy
4857
18.7%
snowySnowy
00
0%
mistyMisty
334
1033.3%

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

Climate Change Indicators:

Over the past 16 years, Half Moon Bay 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 2026, Half Moon Bay experienced significant changes:

Temperature change of

+0.18 °C

Variation in annual rainfall

+57.45 %

Change in average humidity

+8.82 %

PM2.5 levels surged by

-34.01 %

Heatwave changed by

-3 Days

Coldwave changed by

-4 Days

Wind speeds changed by

+0.97 km/h

These indicators show that Half Moon Bay 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 Jul.

Half Moon Bay Weather Forecast 30 Days (August - September 2026)
Half Moon Bay, California, United States

Condition
Temperature IconTemperature
Humidity IconHumi.
Wind IconWind Speed
Mon. 17, Aug.
light drizzleLight Drizzle
Temperature Icon16°/11°
Humidity Icon82%
Wind Icon33.1km/h
Tue. 18, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon11°/11°
Humidity Icon62%
Wind Icon25.6km/h
Wed. 19, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon12°/11°
Humidity Icon63%
Wind Icon37.4km/h
Thu. 20, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon14°/12°
Humidity Icon81%
Wind Icon72.7km/h
Fri. 21, Aug.
overcastOvercast
Temperature Icon14°/12°
Humidity Icon87%
Wind Icon69.1km/h
Sat. 22, Aug.
sunnySunny
Temperature Icon12°/11°
Humidity Icon69%
Wind Icon36km/h
Sun. 23, Aug.
sunnySunny
Temperature Icon11°/11°
Humidity Icon59%
Wind Icon34.9km/h
Mon. 24, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon12°/11°
Humidity Icon73%
Wind Icon37.8km/h
Tue. 25, Aug.
patchy rain possibleRain Possible
Temperature Icon20°/14°
Humidity Icon82%
Wind Icon15.3km/h
Wed. 26, Aug.
patchy rain possibleRain Possible
Temperature Icon21°/14°
Humidity Icon80%
Wind Icon16.5km/h
Thu. 27, Aug.
patchy rain possibleRain Possible
Temperature Icon22°/14°
Humidity Icon78%
Wind Icon16.7km/h
Fri. 28, Aug.
patchy rain possibleRain Possible
Temperature Icon21°/14°
Humidity Icon79%
Wind Icon16.8km/h
Sat. 29, Aug.
patchy rain possibleRain Possible
Temperature Icon21°/14°
Humidity Icon81%
Wind Icon18.3km/h
Sun. 30, Aug.
patchy rain possibleRain Possible
Temperature Icon20°/14°
Humidity Icon83%
Wind Icon17.6km/h
Mon. 31, Aug.
patchy rain possibleRain Possible
Temperature Icon20°/14°
Humidity Icon81%
Wind Icon18.5km/h
Tue. 1, Sep.
patchy rain possibleRain Possible
Temperature Icon22°/14°
Humidity Icon77%
Wind Icon17.6km/h
Wed. 2, Sep.
patchy rain possibleRain Possible
Temperature Icon22°/15°
Humidity Icon78%
Wind Icon16.3km/h
Thu. 3, Sep.
sunnySunny
Temperature Icon22°/14°
Humidity Icon77%
Wind Icon16.3km/h
Fri. 4, Sep.
patchy rain possibleRain Possible
Temperature Icon20°/14°
Humidity Icon79%
Wind Icon17km/h
Sat. 5, Sep.
sunnySunny
Temperature Icon21°/14°
Humidity Icon79%
Wind Icon16.7km/h
Sun. 6, Sep.
sunnySunny
Temperature Icon23°/14°
Humidity Icon76%
Wind Icon16.4km/h
Mon. 7, Sep.
patchy rain possibleRain Possible
Temperature Icon22°/15°
Humidity Icon77%
Wind Icon17.6km/h
Tue. 8, Sep.
patchy rain possibleRain Possible
Temperature Icon21°/14°
Humidity Icon78%
Wind Icon17.6km/h
Wed. 9, Sep.
sunnySunny
Temperature Icon21°/14°
Humidity Icon79%
Wind Icon17km/h
Thu. 10, Sep.
patchy rain possibleRain Possible
Temperature Icon21°/14°
Humidity Icon79%
Wind Icon15.7km/h
Fri. 11, Sep.
patchy rain possibleRain Possible
Temperature Icon21°/15°
Humidity Icon80%
Wind Icon16.8km/h
Sat. 12, Sep.
patchy rain possibleRain Possible
Temperature Icon20°/14°
Humidity Icon82%
Wind Icon16.5km/h
Sun. 13, Sep.
patchy rain possibleRain Possible
Temperature Icon20°/14°
Humidity Icon83%
Wind Icon16.3km/h
Mon. 14, Sep.
patchy rain possibleRain Possible
Temperature Icon19°/14°
Humidity Icon83%
Wind Icon17.5km/h
Tue. 15, Sep.
patchy rain possibleRain Possible
Temperature Icon19°/14°
Humidity Icon83%
Wind Icon19.2km/h
Wed. 16, Sep.
moderate rain at timesRain
Temperature Icon20°/14°
Humidity Icon84%
Wind Icon17.8km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onSun. 6, Sep.

23°C

Low will be onMon. 17, Aug.

11°C

HumidityHumidity

High will be onFri. 21, Aug.

87%

Low will be onSun. 23, Aug.

59%

Wind SpeedWind Speed

High will be onThu. 20, Aug.

72.7km/h

Low will be onTue. 25, Aug.

15.3km/h

PrecipitationPrecipitation

High will be onFri. 21, Aug.

31.6mm

Low will be onThu. 27, Aug.

0.01mm

Ultraviolet IndexUV

High will be onTue. 18, Aug.

8.5

Low will be onMon. 24, Aug.

3

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