Vallejo, California, United States Climate Change Severity

48
High
The current climate change severity in Vallejo is High, with a 2.4% 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 Jul. (Historical Vs 2025) - Weather Data Only
Low
020
Moderate
40
High
60
Very High
80
Extreme
100
°C (c)

Vallejo 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), Vallejo temperature has changed by around -7.8%, 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
9517
-82.1%
cloudyCloudy
5914
-76.2%
rainyRainy
4137
-9.7%
snowySnowy
00
0%
mistyMisty
032
100%

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

Climate Change Indicators:

Over the past 15 years, Vallejo has experienced measurable shifts in key climate parameters, contributing to the current severity score of 48 (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

48/100

High

Low
020
Moderate
40
High
60
Very High
80
Extreme
100

From 2010 to 2025, Vallejo experienced significant changes:

Temperature change of

-1.1 °C

Variation in annual rainfall

-19.03 %

Change in average humidity

+16.09 %

PM2.5 levels surged by

-8.8 %

Heatwave changed by

-5.6 day(s)

Coldwave changed by

-1.9 day(s)

Wind speeds changed by

+0.2 km/h

These indicators show improvement in key parametes of climate, but Vallejo 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 Jul.

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

Condition
Temperature IconTemperature
Humidity Iconhumi.
Wind IconWind Speed
Tue. 26, Aug.
cloudyCloudy
Temperature Icon28°/13°
Humidity Icon78%
Wind Icon21km/h
Wed. 27, Aug.
overcastOvercast
Temperature Icon28°/14°
Humidity Icon76%
Wind Icon19km/h
Thu. 28, Aug.
mistMist
Temperature Icon27°/13°
Humidity Icon76%
Wind Icon14km/h
Fri. 29, Aug.
sunnySunny
Temperature Icon27°/14°
Humidity Icon49%
Wind Icon13km/h
Sat. 30, Aug.
sunnySunny
Temperature Icon29°/15°
Humidity Icon52%
Wind Icon17km/h
Sun. 31, Aug.
sunnySunny
Temperature Icon25°/15°
Humidity Icon64%
Wind Icon14km/h
Mon. 1, Sep.
sunnySunny
Temperature Icon22°/14°
Humidity Icon74%
Wind Icon18km/h
Tue. 2, Sep.
partly cloudyPartly Cloudy
Temperature Icon22°/14°
Humidity Icon73%
Wind Icon16km/h
Wed. 3, Sep.
sunnySunny
Temperature Icon25°/13°
Humidity Icon64%
Wind Icon16km/h
Thu. 4, Sep.
sunnySunny
Temperature Icon27°/14°
Humidity Icon54%
Wind Icon13km/h
Fri. 5, Sep.
sunnySunny
Temperature Icon29°/15°
Humidity Icon45%
Wind Icon16km/h
Sat. 6, Sep.
sunnySunny
Temperature Icon27°/15°
Humidity Icon61%
Wind Icon19km/h
Sun. 7, Sep.
sunnySunny
Temperature Icon27°/15°
Humidity Icon65%
Wind Icon14km/h
Mon. 8, Sep.
sunnySunny
Temperature Icon24°/14°
Humidity Icon71%
Wind Icon15km/h
Tue. 9, Sep.
sunnySunny
Temperature Icon29°/14°
Humidity Icon57%
Wind Icon14km/h
Wed. 10, Sep.
patchy rain possiblePatchy rain possible
Temperature Icon29°/14°
Humidity Icon59%
Wind Icon13km/h
Thu. 11, Sep.
patchy rain possiblePatchy rain possible
Temperature Icon28°/15°
Humidity Icon60%
Wind Icon13km/h
Sat. 13, Sep.
patchy rain possiblePatchy rain possible
Temperature Icon26°/14°
Humidity Icon66%
Wind Icon14km/h
Sun. 14, Sep.
sunnySunny
Temperature Icon25°/13°
Humidity Icon66%
Wind Icon14km/h
Mon. 15, Sep.
patchy rain possiblePatchy rain possible
Temperature Icon25°/13°
Humidity Icon68%
Wind Icon17km/h
Tue. 16, Sep.
patchy rain possiblePatchy rain possible
Temperature Icon25°/13°
Humidity Icon68%
Wind Icon15km/h
Wed. 17, Sep.
patchy rain possiblePatchy rain possible
Temperature Icon25°/13°
Humidity Icon67%
Wind Icon16km/h
Thu. 18, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon25°/14°
Humidity Icon67%
Wind Icon16km/h
Fri. 19, Sep.
patchy rain possiblePatchy rain possible
Temperature Icon26°/14°
Humidity Icon64%
Wind Icon14km/h
Sat. 20, Sep.
patchy rain possiblePatchy rain possible
Temperature Icon28°/15°
Humidity Icon58%
Wind Icon13km/h
Sun. 21, Sep.
moderate rain at timesModerate rain at times
Temperature Icon27°/14°
Humidity Icon55%
Wind Icon15km/h
Mon. 22, Sep.
sunnySunny
Temperature Icon26°/13°
Humidity Icon58%
Wind Icon14km/h
Tue. 23, Sep.
sunnySunny
Temperature Icon28°/14°
Humidity Icon56%
Wind Icon13km/h
Wed. 24, Sep.
sunnySunny
Temperature Icon28°/15°
Humidity Icon55%
Wind Icon14km/h
Thu. 25, Sep.
patchy rain possiblePatchy rain possible
Temperature Icon28°/15°
Humidity Icon54%
Wind Icon13km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onTue. 9, Sep.

28.9°C

Low will be onThu. 28, Aug.

12.6°C

HumidityHumidity

High will be onTue. 26, Aug.

78%

Low will be onFri. 5, Sep.

45%

Wind SpeedWind Speed

High will be onTue. 26, Aug.

20.5km/h

Low will be onFri. 29, Aug.

13km/h

PrecipitationPrecipitation

High will be onThu. 18, Sep.

1.6mm

Low will be onTue. 2, Sep.

0.02mm

Ultraviolet IndexUV

High will be onFri. 5, Sep.

6

Low will be onSat. 13, Sep.

4

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