15-Day Weather Forecast - Sendai

15-day weather forecast for Sendai: temperatures from 15°C (59°F) to 29°C (84°F). Average daily high 23°C (73°F) over the next 15 days.

Hourly Forecast by Day

Today·11 Sep
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Temperature · peaks at +20°C

15-Day Temperature Trend

20°18°TodaySep24°17°Tmrw23°20°Sun27°20°Mon21°19°Tue22°19°Wed24°17°Thu21°16°Fri25°19°Sat26°17°Sun23°15°Mon25°16°Tue29°19°Wed21°15°Thu21°15°Fri
Colour scale for daily high temperature bars

15-Day Weather Forecast

Updated just now
  • Date
    High / Low
  • Fri, Sep 11Today
    +20°/+18°
    feels +22°1.1 mm · 100%4 km/hUV 3 · Low
    05:1417:51
  • Sat, Sep 12Tomorrow
    +24°/+17°
    feels +26°0 mm · 1%6 km/hUV 6 · Hi
    05:1517:50
  • Sun, Sep 13Sun
    +23°/+20°
    feels +26°0 mm · 88%5 km/hUV 1 · Low
    05:1517:48
  • Mon, Sep 14Mon
    +27°/+20°
    feels +32°1.7 mm · 92%7 km/hUV 7 · Hi
    05:1617:46
  • Tue, Sep 15Tue
    +21°/+19°
    feels +26°9.9 mm · 97%11 km/hUV 1 · Low
    05:1717:45
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  • Wed, Sep 16Wed
    +22°/+19°
    feels +24°1.6 mm · 90%9 km/hUV 5 · Mod
    05:1817:43
  • Thu, Sep 17Thu
    +24°/+17°
    feels +25°0 mm · 35%9 km/hUV 1 · Low
    05:1917:42
  • Fri, Sep 18Fri
    +21°/+16°
    feels +23°2.0 mm · 61%9 km/hUV 3 · Mod
    05:2017:40
  • Sat, Sep 19Sat
    +25°/+19°
    feels +29°2.2 mm · 67%9 km/hUV 3 · Mod
    05:2117:39
  • Sun, Sep 20Sun
    +26°/+17°
    feels +31°5.4 mm · 69%5 km/hUV 3 · Low
    05:2217:37
  • Mon, Sep 21Mon
    +23°/+15°
    feels +25°0 mm · 51%10 km/hUV 3 · Low
    05:2217:35
  • Tue, Sep 22Tue
    +25°/+16°
    feels +29°0.6 mm · 51%8 km/hUV 5 · Mod
    05:2317:34
  • Wed, Sep 23Wed
    +29°/+19°
    feels +34°1.2 mm · 63%12 km/hUV 3 · Low
    05:2417:32
  • Thu, Sep 24Thu
    +21°/+15°
    feels +23°0 mm · 53%11 km/hUV 6 · Hi
    05:2517:31
  • Fri, Sep 25Fri
    +21°/+15°
    feels +21°0 mm · 39%6 km/hUV 6 · Mod
    05:2617:29

Weather Insight

Sendai's 15-day outlook ranges from a low of 15°C to a high of 29°C, with an average daytime high near 24°C. Air quality is currently Moderate (AQI 84), driven mainly by PM2.5 at 28 μg/m³.

Today vs Normal

20°C-4° below normal

The long-term average high for today is 24°C.

8 of the last 28 days with published data ran above normal.

It continues that pattern - today's forecast is also running below normal.

2026-08-28: 26°C26°2026-08-29: 21°C21°2026-08-30: 19°C19°2026-08-31: 21°C21°2026-09-01: 21°C21°2026-09-02: 28°C28°2026-09-03: 22°C22°2026-09-04: 24°C24°2026-09-05: 25°C25°2026-09-06: 21°C21°2026-09-07: 20°C20°2026-09-08: 26°C26°

Red = above normal, blue = at or below · last 12 days

Air Quality

Air Quality
Moderate

Air quality is acceptable for most people. Unusually sensitive individuals should consider reducing prolonged or heavy outdoor exertion.

Extended Outlook for Sendai

Over the next 15 days, Sendai is forecast to see temperatures ranging from 14°C to 30°C, averaging a daily high of 24°C. The extended outlook indicates frequent showers on 9 out of 15 days. Conditions are suitable for most outdoor activities; carry an umbrella on days with showers.