15-Day Weather Forecast - Rennes

15-day weather forecast for Rennes: temperatures from 8°C (46°F) to 28°C (82°F). Average daily high 22°C (72°F) over the next 15 days.

Hourly Forecast by Day

Today·11 Sep
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Temperature · peaks at +24°C

15-Day Temperature Trend

24°14°TodaySep26°12°Tmrw27°14°Sun28°18°Mon25°16°Tue21°13°Wed21°12°Thu20°13°Fri21°13°Sat21°14°Sun21°8°Mon24°10°Tue18°14°Wed16°10°Thu16°10°Fri
Colour scale for daily high temperature bars

15-Day Weather Forecast

Updated just now
  • Date
    High / Low
  • Fri, Sep 11Today
    +24°/+14°
    feels +24°0.3 mm · 3%14 km/hUV 4 · Mod
    07:3820:27
  • Sat, Sep 12Tomorrow
    +26°/+12°
    feels +25°11 km/hUV 5 · Mod
    07:3920:25
  • Sun, Sep 13Sun
    +27°/+14°
    feels +27°16 km/hUV 5 · Mod
    07:4020:23
  • Mon, Sep 14Mon
    +28°/+18°
    feels +30°8 km/hUV 5 · Mod
    07:4220:21
  • Tue, Sep 15Tue
    +25°/+16°
    feels +25°0 mm · 3%21 km/hUV 5 · Mod
    07:4320:19
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  • Wed, Sep 16Wed
    +21°/+13°
    feels +19°0 mm · 2%15 km/hUV 3 · Mod
    07:4420:17
  • Thu, Sep 17Thu
    +21°/+12°
    feels +18°0.3 mm · 3%18 km/hUV 3 · Low
    07:4620:15
  • Fri, Sep 18Fri
    +20°/+13°
    feels +18°0.3 mm · 3%13 km/hUV 5 · Mod
    07:4720:13
  • Sat, Sep 19Sat
    +21°/+13°
    feels +19°0 mm · 10%20 km/hUV 5 · Mod
    07:4920:11
  • Sun, Sep 20Sun
    +21°/+14°
    feels +18°0 mm · 16%17 km/hUV 5 · Mod
    07:5020:08
  • Mon, Sep 21Mon
    +21°/+8°
    feels +20°0 mm · 13%5 km/hUV 5 · Mod
    07:5120:06
  • Tue, Sep 22Tue
    +24°/+10°
    feels +23°0 mm · 6%9 km/hUV 4 · Mod
    07:5320:04
  • Wed, Sep 23Wed
    +18°/+14°
    feels +17°0 mm · 3%21 km/hUV 5 · Mod
    07:5420:02
  • Thu, Sep 24Thu
    +16°/+10°
    feels +11°0 mm · 8%22 km/hUV 5 · Mod
    07:5520:00
  • Fri, Sep 25Fri
    +16°/+10°
    feels +12°0 mm · 13%19 km/hUV 3 · Low
    07:5719:58

Weather Insight

Rennes's 15-day outlook ranges from a low of 8°C to a high of 28°C, with an average daytime high near 22°C. Air quality is currently good (AQI 27), with no notable outdoor health concerns.

Today vs Normal

24°C+2° above normal

The long-term average high for today is 22°C.

15 of the last 19 days with published data ran above normal.

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

2026-08-19: 23°C23°2026-08-20: 24°C24°2026-08-21: 23°C23°2026-08-22: 23°C23°2026-08-23: 24°C24°2026-08-24: 27°C27°2026-08-25: 26°C26°2026-08-26: 25°C25°2026-08-27: 25°C25°2026-08-28: 24°C24°2026-08-29: 24°C24°2026-08-30: 22°C22°

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

Air Quality

Air Quality
Good

Air quality is considered satisfactory, and air pollution poses little or no risk. It’s a good day to be active outside.

Extended Outlook for Rennes

Over the next 15 days, Rennes is forecast to see temperatures ranging from 7°C to 29°C, averaging a daily high of 22°C. The extended outlook indicates predominantly dry and clear conditions throughout the period. Conditions are suitable for most outdoor activities; carry an umbrella on days with showers.