San Jose, California, United States Climate Change Severity

52
High
The current climate change severity in San Jose is High, with a 0.6% improvement in the climate score compared to last 15 years. This suggests improved conditions, with more favorable environmental indicators and a reduction in negative impacts.
Data: Jan. to Aug. (Historical Vs 2025) - Weather Data Only
Low
020
Moderate
40
High
60
Very High
80
Extreme
100
°C (c)

San Jose 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), San Jose temperature has changed by around -3.6%, and has experienced notable climate changes.

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

Comparison of Weather Condition (Historic Vs 2025)

HistoricDays

Year 2025Days

Change

sunnySunny
12942
-67.4%
cloudyCloudy
5865
12.06%
rainyRainy
4433
-25%
snowySnowy
00
0%
mistyMisty
025
100%

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

Climate Change Indicators:

Over the past 15 years, San Jose has experienced measurable shifts in key climate parameters, contributing to the current severity score of 52 (within the High severity category). While the score remains High, certain factors have improved over time. 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, San Jose experienced significant changes:

Temperature change of

-0.5 °C

Variation in annual rainfall

-7.2 %

Change in average humidity

+13.3 %

PM2.5 levels surged by

-16.2 %

Heatwave changed by

-5.6 day(s)

Coldwave changed by

-1.4 day(s)

Wind speeds changed by

-3.7 km/h

These indicators show improvement in key parametes of climate, but San Jose remains in the High severity category. Continuous focus on climate resilience is necessary to avoid further worsening and ensure sustainability.

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

San Jose Weather Forecast 30 Days (September - October 2025)
San Jose, California, United States

Condition
Temperature IconTemperature
Humidity Iconhumi.
Wind IconWind Speed
Tue. 2, Sep.
sunnySunny
Temperature Icon35°/19°
Humidity Icon47%
Wind Icon8km/h
Wed. 3, Sep.
sunnySunny
Temperature Icon34°/16°
Humidity Icon56%
Wind Icon9km/h
Thu. 4, Sep.
sunnySunny
Temperature Icon30°/16°
Humidity Icon64%
Wind Icon11km/h
Fri. 5, Sep.
partly cloudyPartly Cloudy
Temperature Icon28°/14°
Humidity Icon71%
Wind Icon15km/h
Sat. 6, Sep.
sunnySunny
Temperature Icon29°/14°
Humidity Icon64%
Wind Icon14km/h
Sun. 7, Sep.
sunnySunny
Temperature Icon29°/15°
Humidity Icon67%
Wind Icon13km/h
Mon. 8, Sep.
sunnySunny
Temperature Icon27°/15°
Humidity Icon67%
Wind Icon17km/h
Tue. 9, Sep.
sunnySunny
Temperature Icon26°/15°
Humidity Icon70%
Wind Icon16km/h
Wed. 10, Sep.
sunnySunny
Temperature Icon27°/14°
Humidity Icon68%
Wind Icon14km/h
Thu. 11, Sep.
sunnySunny
Temperature Icon30°/13°
Humidity Icon64%
Wind Icon10km/h
Fri. 12, Sep.
sunnySunny
Temperature Icon28°/13°
Humidity Icon63%
Wind Icon13km/h
Sat. 13, Sep.
sunnySunny
Temperature Icon25°/13°
Humidity Icon66%
Wind Icon17km/h
Sun. 14, Sep.
partly cloudyPartly Cloudy
Temperature Icon27°/14°
Humidity Icon65%
Wind Icon12km/h
Mon. 15, Sep.
sunnySunny
Temperature Icon27°/13°
Humidity Icon68%
Wind Icon12km/h
Tue. 16, Sep.
patchy rain possiblePatchy rain possible
Temperature Icon26°/14°
Humidity Icon66%
Wind Icon15km/h
Wed. 17, Sep.
sunnySunny
Temperature Icon26°/14°
Humidity Icon65%
Wind Icon15km/h
Thu. 18, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon26°/15°
Humidity Icon66%
Wind Icon16km/h
Fri. 19, Sep.
patchy rain possiblePatchy rain possible
Temperature Icon27°/15°
Humidity Icon64%
Wind Icon15km/h
Sat. 20, Sep.
sunnySunny
Temperature Icon28°/16°
Humidity Icon57%
Wind Icon13km/h
Sun. 21, Sep.
moderate rain at timesModerate rain at times
Temperature Icon28°/16°
Humidity Icon55%
Wind Icon16km/h
Mon. 22, Sep.
sunnySunny
Temperature Icon27°/15°
Humidity Icon58%
Wind Icon15km/h
Tue. 23, Sep.
sunnySunny
Temperature Icon28°/15°
Humidity Icon55%
Wind Icon16km/h
Wed. 24, Sep.
sunnySunny
Temperature Icon29°/16°
Humidity Icon53%
Wind Icon14km/h
Thu. 25, Sep.
patchy rain possiblePatchy rain possible
Temperature Icon29°/16°
Humidity Icon52%
Wind Icon14km/h
Fri. 26, Sep.
patchy rain possiblePatchy rain possible
Temperature Icon29°/16°
Humidity Icon53%
Wind Icon15km/h
Sat. 27, Sep.
sunnySunny
Temperature Icon30°/16°
Humidity Icon51%
Wind Icon13km/h
Sun. 28, Sep.
sunnySunny
Temperature Icon28°/16°
Humidity Icon54%
Wind Icon14km/h
Mon. 29, Sep.
sunnySunny
Temperature Icon26°/15°
Humidity Icon59%
Wind Icon14km/h
Tue. 30, Sep.
patchy rain possiblePatchy rain possible
Temperature Icon26°/15°
Humidity Icon60%
Wind Icon14km/h
Wed. 1, Oct.
moderate rain at timesModerate rain at times
Temperature Icon27°/15°
Humidity Icon53%
Wind Icon15km/h
Thu. 2, Oct.
patchy rain possiblePatchy rain possible
Temperature Icon27°/16°
Humidity Icon51%
Wind Icon14km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onTue. 2, Sep.

35.1°C

Low will be onSat. 13, Sep.

12.6°C

HumidityHumidity

High will be onFri. 5, Sep.

71%

Low will be onTue. 2, Sep.

47%

Wind SpeedWind Speed

High will be onMon. 8, Sep.

16.6km/h

Low will be onTue. 2, Sep.

7.6km/h

PrecipitationPrecipitation

High will be onThu. 18, Sep.

1.9mm

Low will be onTue. 16, Sep.

0.2mm

Ultraviolet IndexUV

High will be onSun. 7, Sep.

6

Low will be onTue. 16, Sep.

4

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