Sliven, Sliven Province, Bulgaria Climate Change Severity

43
High
The current climate change severity in Sliven is High, with a 4.7% 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)

Sliven 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), Sliven temperature has changed by around -0.2%, 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
6853
-22.05%
cloudyCloudy
5836
-37.9%
rainyRainy
9461
-35.1%
snowySnowy
35
66.6%
mistyMisty
00
0%

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

Climate Change Indicators:

Over the past 15 years, Sliven has experienced measurable shifts in key climate parameters, contributing to the current severity score of 43 (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

43/100

High

Low
020
Moderate
40
High
60
Very High
80
Extreme
100

From 2010 to 2025, Sliven experienced significant changes:

Temperature change of

-0.02 °C

Variation in annual rainfall

-40.1 %

Change in average humidity

-4.4 %

PM2.5 levels surged by

+100 %

Heatwave changed by

+3.3 day(s)

Coldwave changed by

+3.1 day(s)

Wind speeds changed by

-0.6 km/h

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

Sliven Weather Forecast 30 Days (August - September 2025)
Sliven, Sliven Province, Bulgaria

Condition
Temperature IconTemperature
Humidity Iconhumi.
Wind IconWind Speed
Sun. 31, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon27°/16°
Humidity Icon57%
Wind Icon15km/h
Mon. 1, Sep.
sunnySunny
Temperature Icon29°/14°
Humidity Icon55%
Wind Icon17km/h
Tue. 2, Sep.
sunnySunny
Temperature Icon34°/20°
Humidity Icon40%
Wind Icon11km/h
Wed. 3, Sep.
sunnySunny
Temperature Icon34°/21°
Humidity Icon38%
Wind Icon23km/h
Thu. 4, Sep.
sunnySunny
Temperature Icon32°/17°
Humidity Icon48%
Wind Icon25km/h
Fri. 5, Sep.
sunnySunny
Temperature Icon31°/17°
Humidity Icon44%
Wind Icon25km/h
Sat. 6, Sep.
partly cloudyPartly Cloudy
Temperature Icon30°/16°
Humidity Icon38%
Wind Icon14km/h
Sun. 7, Sep.
sunnySunny
Temperature Icon30°/15°
Humidity Icon38%
Wind Icon23km/h
Mon. 8, Sep.
sunnySunny
Temperature Icon29°/14°
Humidity Icon38%
Wind Icon23km/h
Tue. 9, Sep.
sunnySunny
Temperature Icon28°/14°
Humidity Icon41%
Wind Icon22km/h
Wed. 10, Sep.
sunnySunny
Temperature Icon28°/13°
Humidity Icon47%
Wind Icon18km/h
Thu. 11, Sep.
sunnySunny
Temperature Icon27°/12°
Humidity Icon56%
Wind Icon18km/h
Fri. 12, Sep.
sunnySunny
Temperature Icon25°/13°
Humidity Icon60%
Wind Icon14km/h
Sat. 13, Sep.
sunnySunny
Temperature Icon28°/12°
Humidity Icon57%
Wind Icon11km/h
Sun. 14, Sep.
moderate rain at timesModerate rain at times
Temperature Icon27°/15°
Humidity Icon51%
Wind Icon15km/h
Mon. 15, Sep.
patchy rain possiblePatchy rain possible
Temperature Icon28°/16°
Humidity Icon53%
Wind Icon13km/h
Tue. 16, Sep.
moderate rain at timesModerate rain at times
Temperature Icon27°/16°
Humidity Icon58%
Wind Icon12km/h
Wed. 17, Sep.
patchy rain possiblePatchy rain possible
Temperature Icon27°/16°
Humidity Icon59%
Wind Icon12km/h
Thu. 18, Sep.
moderate rain at timesModerate rain at times
Temperature Icon26°/15°
Humidity Icon60%
Wind Icon16km/h
Fri. 19, Sep.
patchy rain possiblePatchy rain possible
Temperature Icon25°/14°
Humidity Icon61%
Wind Icon13km/h
Sat. 20, Sep.
moderate rain at timesModerate rain at times
Temperature Icon24°/13°
Humidity Icon61%
Wind Icon16km/h
Sun. 21, Sep.
moderate rain at timesModerate rain at times
Temperature Icon22°/12°
Humidity Icon60%
Wind Icon13km/h
Mon. 22, Sep.
moderate rain at timesModerate rain at times
Temperature Icon23°/12°
Humidity Icon58%
Wind Icon13km/h
Tue. 23, Sep.
heavy rain at timesHeavy rain at times
Temperature Icon23°/12°
Humidity Icon56%
Wind Icon13km/h
Wed. 24, Sep.
moderate rain at timesModerate rain at times
Temperature Icon24°/12°
Humidity Icon55%
Wind Icon14km/h
Thu. 25, Sep.
patchy rain possiblePatchy rain possible
Temperature Icon24°/13°
Humidity Icon57%
Wind Icon14km/h
Fri. 26, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon24°/13°
Humidity Icon63%
Wind Icon15km/h
Sat. 27, Sep.
heavy rain at timesHeavy rain at times
Temperature Icon22°/12°
Humidity Icon63%
Wind Icon17km/h
Sun. 28, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon22°/12°
Humidity Icon64%
Wind Icon14km/h
Mon. 29, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon23°/12°
Humidity Icon60%
Wind Icon14km/h
Tue. 30, Sep.
heavy rain at timesHeavy rain at times
Temperature Icon21°/12°
Humidity Icon61%
Wind Icon16km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onWed. 3, Sep.

34.4°C

Low will be onTue. 23, Sep.

11.5°C

HumidityHumidity

High will be onSun. 28, Sep.

64%

Low will be onWed. 3, Sep.

38%

Wind SpeedWind Speed

High will be onThu. 4, Sep.

25.2km/h

Low will be onTue. 2, Sep.

10.8km/h

PrecipitationPrecipitation

High will be onFri. 26, Sep.

3.2mm

Low will be onSat. 6, Sep.

0.06mm

Ultraviolet IndexUV

High will be onFri. 5, Sep.

6

Low will be onSun. 31, Aug.

1.3

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