🇯🇵 Weather in Niihama
Map Overlays:
Hourly Forecast for Niihama
12:00
22°
86%
13:00
22°
90%
14:00
22°
72%
15:00
23°
73%
16:00
23°
79%
17:00
23°
74%
18:00
23°
51%
19:00
24°
36%
20:00
24°
21%
21:00
23°
20%
22:00
23°
20%
23:00
23°
21%
00:00
23°
20%
01:00
23°
22%
02:00
23°
21%
03:00
23°
26%
04:00
23°
44%
05:00
22°
44%
06:00
22°
50%
07:00
23°
46%
08:00
23°
29%
09:00
24°
42%
10:00
24°
26%
11:00
24°
24%
14-Day Forecast for Niihama
2026-09-04
Light rain shower
25° /
22°
2026-09-05
Patchy rain nearby
25° /
22°
2026-09-06
Patchy rain nearby
28° /
24°
2026-09-07
Patchy rain nearby
27° /
25°
2026-09-08
Patchy rain nearby
26° /
24°
2026-09-09
Patchy rain nearby
25° /
24°
2026-09-10
Moderate or heavy rain shower
25° /
23°
Additional Forecasts for Niihama
Air Quality
💨 US EPA Index 1 (Good)
CO (Carbon Monoxide) 137.0 μg/m³
O₃ (Ozone) 28.0 μg/m³
NO₂ (Nitrogen Dioxide) 16.4 μg/m³
SO₂ (Sulphur Dioxide) 5.1 μg/m³
PM2.5 (Fine particles) 2.0 μg/m³
PM10 (Coarse particles) 2.3 μg/m³
Historical Weather
Weather Forecasts for Other Cities in Japan
Weather in Niihama — FAQ
Answers refreshed each request based on current conditions in Niihama.
What is the weather like right now in Niihama?
Right now in Niihama, Japan the temperature is 21.8°C (feels like 21.0°C), with moderate or heavy rain shower. Relative humidity is 86% and wind is 21.6 km/h.
What is today's high and low temperature in Niihama?
Today's forecast high in Niihama is 25.3°C and the overnight low is 21.8°C. The diurnal range — high minus low — depends on cloud cover; clear days swing more than overcast ones.
Will it rain in Niihama today?
The chance of precipitation in Niihama today is 89%. Forecast accuracy is highest within the next 6 hours and decreases steadily out to 14 days.
How often does the weather here update?
Current observations refresh every 15-60 minutes from the nearest monitoring stations operated by national meteorological agencies. The hourly forecast updates approximately every hour; the 7- and 14-day outlook is recomputed several times per day.
What does 'feels like' temperature mean?
Feels-like (apparent) temperature accounts for humidity, wind chill and direct sunshine — variables that change how the human body perceives heat or cold. On hot, humid days it can be 3-7°C above the actual reading; on cold windy days it can be 5-15°C below.
Why does the temperature in Niihama differ from nearby cities?
Even short distances can change temperatures noticeably. Niihama's reading reflects altitude, proximity to large bodies of water, urban heat island effects, and the exact location of the monitoring stations supplying the data. Coastal cities are typically milder and more humid than inland equivalents.