Hayward, California, United States Climate Change Severity

52
High
The current climate change severity in Hayward is High, with a 4.9% worsening in the climate score compared to last 15 years. This suggests deteriorating conditions, with increasing negative impacts on weather patterns and environmental conditions.
Data: Jan. to Jul. (Historical Vs 2025) - Weather Data Only
Low
020
Moderate
40
High
60
Very High
80
Extreme
100
°C

Hayward Weather Condition Changes (Historic Vs 2025)

2025
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Historic
2025

Over the past 15 year(s), Hayward temperature has changed by around -14.07%, and has experienced notable climate changes.

Sunny
Cloudy
Rainy
Snowy
Misty
Data: Jan. to Jul. (Historical Vs 2025)

Comparison of Weather Condition (Historic Vs 2025)

HistoricDays

Year 2025Days

Change

sunnySunny
10015
-85%
cloudyCloudy
5321
-60.3%
rainyRainy
4538
-15.5%
snowySnowy
00
0%
mistyMisty
027
100%

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

Climate Change Indicators:

Over the past 15 years, Hayward 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, Hayward experienced significant changes:

Temperature change of

-1.9 °C

Variation in annual rainfall

-11.7 %

Change in average humidity

+20.2 %

PM2.5 levels surged by

+100 %

Heatwave changed by

-4.6 day(s)

Coldwave changed by

+6.6 day(s)

Wind speeds changed by

-0.8 km/h

These indicators show that Hayward 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.

Hayward Weather Forecast 30 Days (August - September 2025)
Hayward, California, United States

Condition
Temperature IconTemperature
Humidity Iconhumi.
Wind IconWind Speed
Fri. 8, Aug.
sunnySunny
Temperature Icon33°/13°
Humidity Icon66%
Wind Icon13km/h
Sat. 9, Aug.
sunnySunny
Temperature Icon31°/13°
Humidity Icon66%
Wind Icon14km/h
Sun. 10, Aug.
sunnySunny
Temperature Icon27°/12°
Humidity Icon70%
Wind Icon14km/h
Mon. 11, Aug.
sunnySunny
Temperature Icon30°/15°
Humidity Icon59%
Wind Icon15km/h
Tue. 12, Aug.
sunnySunny
Temperature Icon28°/14°
Humidity Icon62%
Wind Icon14km/h
Wed. 13, Aug.
sunnySunny
Temperature Icon25°/13°
Humidity Icon70%
Wind Icon14km/h
Thu. 14, Aug.
partly cloudyPartly Cloudy
Temperature Icon23°/15°
Humidity Icon74%
Wind Icon18km/h
Fri. 15, Aug.
sunnySunny
Temperature Icon24°/14°
Humidity Icon69%
Wind Icon15km/h
Sat. 16, Aug.
sunnySunny
Temperature Icon25°/13°
Humidity Icon70%
Wind Icon16km/h
Sun. 17, Aug.
sunnySunny
Temperature Icon23°/13°
Humidity Icon71%
Wind Icon15km/h
Mon. 18, Aug.
sunnySunny
Temperature Icon25°/13°
Humidity Icon72%
Wind Icon13km/h
Tue. 19, Aug.
sunnySunny
Temperature Icon26°/12°
Humidity Icon68%
Wind Icon14km/h
Wed. 20, Aug.
sunnySunny
Temperature Icon27°/12°
Humidity Icon64%
Wind Icon13km/h
Thu. 21, Aug.
sunnySunny
Temperature Icon27°/12°
Humidity Icon65%
Wind Icon13km/h
Fri. 22, Aug.
sunnySunny
Temperature Icon27°/15°
Humidity Icon67%
Wind Icon14km/h
Sat. 23, Aug.
sunnySunny
Temperature Icon28°/15°
Humidity Icon65%
Wind Icon13km/h
Sun. 24, Aug.
sunnySunny
Temperature Icon27°/15°
Humidity Icon64%
Wind Icon14km/h
Mon. 25, Aug.
sunnySunny
Temperature Icon27°/15°
Humidity Icon64%
Wind Icon13km/h
Tue. 26, Aug.
sunnySunny
Temperature Icon27°/14°
Humidity Icon62%
Wind Icon14km/h
Wed. 27, Aug.
sunnySunny
Temperature Icon28°/15°
Humidity Icon59%
Wind Icon15km/h
Thu. 28, Aug.
patchy rain possiblePatchy rain possible
Temperature Icon29°/16°
Humidity Icon60%
Wind Icon15km/h
Fri. 29, Aug.
patchy rain possiblePatchy rain possible
Temperature Icon27°/15°
Humidity Icon62%
Wind Icon14km/h
Sat. 30, Aug.
sunnySunny
Temperature Icon27°/15°
Humidity Icon63%
Wind Icon14km/h
Sun. 31, Aug.
sunnySunny
Temperature Icon27°/15°
Humidity Icon63%
Wind Icon14km/h
Mon. 1, Sep.
patchy rain possiblePatchy rain possible
Temperature Icon29°/15°
Humidity Icon58%
Wind Icon14km/h
Tue. 2, Sep.
sunnySunny
Temperature Icon29°/16°
Humidity Icon59%
Wind Icon14km/h
Wed. 3, Sep.
sunnySunny
Temperature Icon28°/15°
Humidity Icon60%
Wind Icon15km/h
Thu. 4, Sep.
sunnySunny
Temperature Icon27°/15°
Humidity Icon61%
Wind Icon14km/h
Fri. 5, Sep.
sunnySunny
Temperature Icon28°/15°
Humidity Icon61%
Wind Icon14km/h
Sat. 6, Sep.
sunnySunny
Temperature Icon30°/16°
Humidity Icon53%
Wind Icon14km/h
Sun. 7, Sep.
patchy rain possiblePatchy rain possible
Temperature Icon29°/16°
Humidity Icon54%
Wind Icon14km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onFri. 8, Aug.

33°C

Low will be onThu. 21, Aug.

11.7°C

HumidityHumidity

High will be onThu. 14, Aug.

74%

Low will be onSat. 6, Sep.

53%

Wind SpeedWind Speed

High will be onThu. 14, Aug.

18km/h

Low will be onFri. 8, Aug.

12.6km/h

PrecipitationPrecipitation

High will be onFri. 15, Aug.

0.01mm

Low will be onFri. 15, Aug.

0.01mm

Ultraviolet IndexUV

High will be onSat. 23, Aug.

6

Low will be onWed. 13, Aug.

5

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