Suwa, Nagano, Japan Climate Change Severity

33
Moderate
The current climate change severity in Suwa is Moderate, with a -27.7% 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

Suwa 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), Suwa temperature has changed by around +0.7%, 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
3928
-28.2%
cloudyCloudy
5928
-52.5%
rainyRainy
8782
-5.7%
snowySnowy
811
37.5%
mistyMisty
01
100%

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

Climate Change Indicators:

Over the past 15 years, Suwa has experienced measurable improvements in key climate parameters, contributing to the current severity score of 33 (within the Moderate severity category). This suggests improving climate conditions compared to previous years. Here’s a breakdown of the specific changes observed:

Severity Score

33/100

Moderate

Low
020
Moderate
40
High
60
Very High
80
Extreme
100

From 2010 to 2025, Suwa experienced significant changes:

Temperature change of

+0.06 °C

Variation in annual rainfall

+4.5 %

Change in average humidity

-2.7 %

PM2.5 levels surged by

-2.06 %

Heatwave changed by

-2.5 day(s)

Coldwave changed by

-0.6 day(s)

Wind speeds changed by

+0.3 km/h

These indicators show reduced climate volatility, offering a valuable window to reinforce sustainable practices and strengthen long-term climate resilience. As the severity shifts toward Moderate, it is important to maintain momentum in climate adaptation efforts.

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

Suwa Weather Forecast 30 Days (August - September 2025)
Suwa, Nagano, Japan

Condition
Temperature IconTemperature
Humidity Iconhumi.
Wind IconWind Speed
Sat. 9, Aug.
partly cloudyPartly Cloudy
Temperature Icon28°/10°
Humidity Icon68%
Wind Icon12km/h
Sun. 10, Aug.
heavy rainHeavy rain
Temperature Icon20°/12°
Humidity Icon97%
Wind Icon9km/h
Mon. 11, Aug.
moderate rainModerate rain
Temperature Icon19°/14°
Humidity Icon98%
Wind Icon10km/h
Tue. 12, Aug.
moderate rainModerate rain
Temperature Icon24°/14°
Humidity Icon94%
Wind Icon12km/h
Wed. 13, Aug.
moderate rainModerate rain
Temperature Icon26°/14°
Humidity Icon90%
Wind Icon8km/h
Thu. 14, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon24°/14°
Humidity Icon92%
Wind Icon4km/h
Fri. 15, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon28°/14°
Humidity Icon84%
Wind Icon6km/h
Sat. 16, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon28°/13°
Humidity Icon80%
Wind Icon5km/h
Sun. 17, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon25°/16°
Humidity Icon85%
Wind Icon4km/h
Mon. 18, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon26°/14°
Humidity Icon86%
Wind Icon5km/h
Tue. 19, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon23°/14°
Humidity Icon88%
Wind Icon5km/h
Wed. 20, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon26°/14°
Humidity Icon87%
Wind Icon5km/h
Thu. 21, Aug.
moderate rainModerate rain
Temperature Icon25°/15°
Humidity Icon88%
Wind Icon4km/h
Fri. 22, Aug.
moderate rainModerate rain
Temperature Icon25°/14°
Humidity Icon90%
Wind Icon4km/h
Sat. 23, Aug.
patchy rain possiblePatchy rain nearby
Temperature Icon28°/13°
Humidity Icon83%
Wind Icon4km/h
Sun. 24, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon26°/16°
Humidity Icon81%
Wind Icon9km/h
Mon. 25, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon26°/16°
Humidity Icon83%
Wind Icon8km/h
Tue. 26, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon27°/15°
Humidity Icon82%
Wind Icon8km/h
Wed. 27, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon26°/15°
Humidity Icon82%
Wind Icon7km/h
Thu. 28, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon26°/15°
Humidity Icon83%
Wind Icon7km/h
Fri. 29, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon27°/15°
Humidity Icon82%
Wind Icon8km/h
Sat. 30, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon26°/16°
Humidity Icon84%
Wind Icon9km/h
Sun. 31, Aug.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon26°/15°
Humidity Icon83%
Wind Icon10km/h
Mon. 1, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon24°/15°
Humidity Icon84%
Wind Icon9km/h
Tue. 2, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon25°/14°
Humidity Icon84%
Wind Icon9km/h
Wed. 3, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon25°/15°
Humidity Icon85%
Wind Icon10km/h
Thu. 4, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon25°/15°
Humidity Icon86%
Wind Icon9km/h
Fri. 5, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon26°/15°
Humidity Icon84%
Wind Icon8km/h
Sat. 6, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon25°/15°
Humidity Icon83%
Wind Icon9km/h
Sun. 7, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon25°/14°
Humidity Icon83%
Wind Icon10km/h
Mon. 8, Sep.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon22°/15°
Humidity Icon88%
Wind Icon11km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onSat. 23, Aug.

28°C

Low will be onSat. 9, Aug.

10.1°C

HumidityHumidity

High will be onMon. 11, Aug.

98%

Low will be onSat. 9, Aug.

68%

Wind SpeedWind Speed

High will be onSat. 9, Aug.

12.2km/h

Low will be onThu. 14, Aug.

4km/h

PrecipitationPrecipitation

High will be onSun. 10, Aug.

37.6mm

Low will be onSat. 9, Aug.

0.06mm

Ultraviolet IndexUV

High will be onSat. 16, Aug.

5

Low will be onSun. 10, Aug.

0.3

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