Napa, California, United States Climate Change Severity

52
High
The current climate change severity in Napa is High, with a 4.2% 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

Napa 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), Napa temperature has changed by around -10.2%, 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
9622
-77.08%
cloudyCloudy
5726
-54.3%
rainyRainy
4039
-2.5%
snowySnowy
00
0%
mistyMisty
048
100%

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

Climate Change Indicators:

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

Temperature change of

-1.4 °C

Variation in annual rainfall

-15.8 %

Change in average humidity

+14.1 %

PM2.5 levels surged by

-19.05 %

Heatwave changed by

-4.2 day(s)

Coldwave changed by

-3.06 day(s)

Wind speeds changed by

-0.6 km/h

These indicators show that Napa 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.

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

Condition
Temperature IconTemperature
Humidity Iconhumi.
Wind IconWind Speed
Sat. 9, Aug.
sunnySunny
Temperature Icon35°/13°
Humidity Icon62%
Wind Icon12km/h
Sun. 10, Aug.
sunnySunny
Temperature Icon34°/12°
Humidity Icon66%
Wind Icon12km/h
Mon. 11, Aug.
partly cloudyPartly Cloudy
Temperature Icon31°/11°
Humidity Icon63%
Wind Icon15km/h
Tue. 12, Aug.
sunnySunny
Temperature Icon28°/13°
Humidity Icon66%
Wind Icon14km/h
Wed. 13, Aug.
partly cloudyPartly Cloudy
Temperature Icon24°/13°
Humidity Icon70%
Wind Icon16km/h
Thu. 14, Aug.
sunnySunny
Temperature Icon27°/14°
Humidity Icon65%
Wind Icon19km/h
Fri. 15, Aug.
sunnySunny
Temperature Icon25°/12°
Humidity Icon71%
Wind Icon16km/h
Sat. 16, Aug.
sunnySunny
Temperature Icon28°/14°
Humidity Icon65%
Wind Icon14km/h
Sun. 17, Aug.
sunnySunny
Temperature Icon27°/13°
Humidity Icon67%
Wind Icon13km/h
Mon. 18, Aug.
sunnySunny
Temperature Icon28°/13°
Humidity Icon67%
Wind Icon11km/h
Tue. 19, Aug.
sunnySunny
Temperature Icon30°/13°
Humidity Icon62%
Wind Icon11km/h
Wed. 20, Aug.
sunnySunny
Temperature Icon33°/13°
Humidity Icon51%
Wind Icon12km/h
Thu. 21, Aug.
sunnySunny
Temperature Icon32°/15°
Humidity Icon48%
Wind Icon11km/h
Fri. 22, Aug.
sunnySunny
Temperature Icon26°/13°
Humidity Icon66%
Wind Icon12km/h
Sat. 23, Aug.
sunnySunny
Temperature Icon29°/14°
Humidity Icon64%
Wind Icon13km/h
Sun. 24, Aug.
sunnySunny
Temperature Icon29°/14°
Humidity Icon64%
Wind Icon14km/h
Mon. 25, Aug.
sunnySunny
Temperature Icon28°/14°
Humidity Icon62%
Wind Icon13km/h
Tue. 26, Aug.
sunnySunny
Temperature Icon29°/14°
Humidity Icon60%
Wind Icon14km/h
Wed. 27, Aug.
sunnySunny
Temperature Icon30°/14°
Humidity Icon58%
Wind Icon14km/h
Thu. 28, Aug.
patchy rain possiblePatchy rain possible
Temperature Icon30°/15°
Humidity Icon58%
Wind Icon14km/h
Fri. 29, Aug.
sunnySunny
Temperature Icon29°/15°
Humidity Icon61%
Wind Icon14km/h
Sat. 30, Aug.
sunnySunny
Temperature Icon29°/14°
Humidity Icon61%
Wind Icon14km/h
Sun. 31, Aug.
sunnySunny
Temperature Icon29°/14°
Humidity Icon60%
Wind Icon14km/h
Mon. 1, Sep.
sunnySunny
Temperature Icon30°/15°
Humidity Icon56%
Wind Icon13km/h
Tue. 2, Sep.
sunnySunny
Temperature Icon30°/16°
Humidity Icon57%
Wind Icon13km/h
Wed. 3, Sep.
sunnySunny
Temperature Icon30°/15°
Humidity Icon57%
Wind Icon14km/h
Thu. 4, Sep.
patchy rain possiblePatchy rain possible
Temperature Icon29°/15°
Humidity Icon57%
Wind Icon14km/h
Fri. 5, Sep.
sunnySunny
Temperature Icon30°/14°
Humidity Icon58%
Wind Icon13km/h
Sat. 6, Sep.
sunnySunny
Temperature Icon32°/16°
Humidity Icon50%
Wind Icon12km/h
Sun. 7, Sep.
patchy rain possiblePatchy rain possible
Temperature Icon31°/16°
Humidity Icon51%
Wind Icon14km/h
Mon. 8, Sep.
sunnySunny
Temperature Icon31°/16°
Humidity Icon54%
Wind Icon14km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onSat. 9, Aug.

35°C

Low will be onMon. 11, Aug.

11.3°C

HumidityHumidity

High will be onFri. 15, Aug.

71%

Low will be onThu. 21, Aug.

48%

Wind SpeedWind Speed

High will be onThu. 14, Aug.

19.1km/h

Low will be onMon. 18, Aug.

11.2km/h

Ultraviolet IndexUV

High will be onWed. 20, Aug.

6

Low will be onWed. 13, Aug.

5

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