St Helena, California, United States Climate Change Severity

67
Very High
The current climate change severity in St Helena is Very High, with a 27.9% 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 May (Historical Vs 2026) - Weather Data Only
Low
020
Moderate
40
High
60
Very High
80
Extreme
100


St Helena Weather Condition Changes (Historic Vs 2026)

0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Historic
2026

Over the past 16 year(s), St Helena temperature has changed by around +22.1%, and has experienced notable climate changes.

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

Comparison of Weather Condition (Historic Vs 2026)

HistoricDays

Year 2026Days

Change

sunnySunny
5063
26%

cloudyCloudy
3819
-50%

rainyRainy
4320
-53.4%

snowySnowy
00
0%

mistyMisty
012
100%

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

Climate Change Indicators:

Over the past 16 years, St Helena has experienced measurable shifts in key climate parameters, contributing to the current severity score of 67 (within the Very High severity category). This suggests worsening climate conditions from the previous years. Here’s a breakdown of the specific changes observed:

Severity Score

67/100


Very High

Low
020
Moderate
40
High
60
Very High
80
Extreme
100

From 2010 to 2026, St Helena experienced significant changes:

Temperature change of

+2.6 °C


Variation in annual rainfall

+57.16 %


Change in average humidity

-5.44 %


PM2.5 levels surged by

-24.49 %


Heatwave changed by

+13 Days


Coldwave changed by

-1 Days


Wind speeds changed by

-2.05 km/h


These indicators show a dramatic increase in volatility and worsening conditions. St Helena's Very High severity status requires urgent and immediate adaptation and mitigation strategies, particularly focused on managing extreme weather events, improving air quality, and ensuring water resources are adequate for the population.

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

St Helena Weather Forecast 30 Days (June - July 2026)
St Helena, California, United States


Condition
Temperature IconTemperature
Humidity IconHumi.
Wind IconWind Speed
Wed. 3, Jun.
sunnySunny

Temperature Icon34°/13°

Humidity Icon50%

Wind Icon18.4km/h
Thu. 4, Jun.
sunnySunny

Temperature Icon34°/12°

Humidity Icon47%

Wind Icon11.9km/h
Fri. 5, Jun.
sunnySunny

Temperature Icon34°/13°

Humidity Icon41%

Wind Icon18km/h
Sat. 6, Jun.
sunnySunny

Temperature Icon29°/7°

Humidity Icon48%

Wind Icon13.7km/h
Sun. 7, Jun.
sunnySunny

Temperature Icon27°/7°

Humidity Icon48%

Wind Icon16.6km/h
Mon. 8, Jun.
patchy rain possiblePatchy rain nearby

Temperature Icon12°/9°

Humidity Icon88%

Wind Icon8.3km/h
Tue. 9, Jun.
sunnySunny

Temperature Icon25°/8°

Humidity Icon64%

Wind Icon11.9km/h
Wed. 10, Jun.
sunnySunny

Temperature Icon30°/10°

Humidity Icon47%

Wind Icon12.6km/h
Thu. 11, Jun.
patchy rain possiblePatchy rain possible

Temperature Icon29°/12°

Humidity Icon55%

Wind Icon15.5km/h
Fri. 12, Jun.
patchy rain possiblePatchy rain possible

Temperature Icon28°/12°

Humidity Icon58%

Wind Icon16.6km/h
Sat. 13, Jun.
sunnySunny

Temperature Icon28°/12°

Humidity Icon57%

Wind Icon15.5km/h
Sun. 14, Jun.
patchy rain possiblePatchy rain possible

Temperature Icon29°/12°

Humidity Icon55%

Wind Icon15.5km/h
Mon. 15, Jun.
patchy rain possiblePatchy rain possible

Temperature Icon28°/12°

Humidity Icon54%

Wind Icon15.5km/h
Tue. 16, Jun.
sunnySunny

Temperature Icon29°/12°

Humidity Icon52%

Wind Icon15.5km/h
Wed. 17, Jun.
patchy rain possiblePatchy rain possible

Temperature Icon29°/13°

Humidity Icon51%

Wind Icon14.4km/h
Thu. 18, Jun.
sunnySunny

Temperature Icon30°/13°

Humidity Icon49%

Wind Icon15.8km/h
Fri. 19, Jun.
sunnySunny

Temperature Icon30°/13°

Humidity Icon49%

Wind Icon15.8km/h
Sat. 20, Jun.
sunnySunny

Temperature Icon30°/13°

Humidity Icon49%

Wind Icon15.1km/h
Sun. 21, Jun.
sunnySunny

Temperature Icon30°/13°

Humidity Icon48%

Wind Icon14.8km/h
Mon. 22, Jun.
sunnySunny

Temperature Icon31°/14°

Humidity Icon48%

Wind Icon14km/h
Tue. 23, Jun.
patchy rain possiblePatchy rain possible

Temperature Icon30°/14°

Humidity Icon51%

Wind Icon15.5km/h
Wed. 24, Jun.
patchy rain possiblePatchy rain possible

Temperature Icon29°/13°

Humidity Icon56%

Wind Icon14.4km/h
Thu. 25, Jun.
patchy rain possiblePatchy rain possible

Temperature Icon29°/13°

Humidity Icon57%

Wind Icon15.5km/h
Fri. 26, Jun.
sunnySunny

Temperature Icon30°/13°

Humidity Icon54%

Wind Icon14.8km/h
Sat. 27, Jun.
sunnySunny

Temperature Icon31°/14°

Humidity Icon52%

Wind Icon15.1km/h
Sun. 28, Jun.
moderate rain at timesModerate rain at times

Temperature Icon31°/15°

Humidity Icon49%

Wind Icon15.1km/h
Mon. 29, Jun.
sunnySunny

Temperature Icon32°/14°

Humidity Icon47%

Wind Icon14.4km/h
Tue. 30, Jun.
sunnySunny

Temperature Icon33°/15°

Humidity Icon48%

Wind Icon14km/h
Wed. 1, Jul.
sunnySunny

Temperature Icon32°/14°

Humidity Icon51%

Wind Icon14km/h
Thu. 2, Jul.
sunnySunny

Temperature Icon32°/15°

Humidity Icon52%

Wind Icon13.7km/h
Fri. 3, Jul.
patchy rain possiblePatchy rain possible

Temperature Icon31°/14°

Humidity Icon51%

Wind Icon13.7km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onWed. 3, Jun.

34°C


Low will be onSat. 6, Jun.

7°C

HumidityHumidity

High will be onMon. 8, Jun.

88%


Low will be onFri. 5, Jun.

41%

Wind SpeedWind Speed

High will be onWed. 3, Jun.

18.4km/h


Low will be onMon. 8, Jun.

8.3km/h

PrecipitationPrecipitation

High will be onMon. 8, Jun.

1.8mm


Low will be onThu. 11, Jun.

0.1mm

Ultraviolet IndexUV

High will be onThu. 4, Jun.

10.4


Low will be onMon. 8, Jun.

3