15-Day Weather Forecast - Swansea

15-day weather forecast for Swansea: temperatures from 7°C (45°F) to 20°C (68°F). Average daily high 17°C (63°F) over the next 15 days.

Hourly Forecast by Day

Today·11 Sep
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Temperature · peaks at +19°C

15-Day Temperature Trend

19°14°TodaySep18°13°Tmrw20°17°Sun19°17°Mon18°13°Tue16°12°Wed17°13°Thu16°12°Fri17°13°Sat16°10°Sun17°9°Mon18°13°Tue14°10°Wed13°8°Thu13°7°Fri
Colour scale for daily high temperature bars

15-Day Weather Forecast

Updated just now
  • Date
    High / Low
  • Fri, Sep 11Today
    +19°/+14°
    feels +18°0.4 mm · 75%20 km/hUV 3 · Mod
    06:4419:39
  • Sat, Sep 12Tomorrow
    +18°/+13°
    feels +19°9.4 mm · 99%30 km/hUV 1 · Low
    06:4519:37
  • Sun, Sep 13Sun
    +20°/+17°
    feels +21°20.5 mm · 85%18 km/hUV 3 · Low
    06:4719:34
  • Mon, Sep 14Mon
    +19°/+17°
    feels +20°9.4 mm · 68%22 km/hUV 4 · Mod
    06:4819:32
  • Tue, Sep 15Tue
    +18°/+13°
    feels +17°1.3 mm · 63%20 km/hUV 4 · Mod
    06:5019:30
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  • Wed, Sep 16Wed
    +16°/+12°
    feels +14°0 mm · 36%17 km/hUV 3 · Low
    06:5219:28
  • Thu, Sep 17Thu
    +17°/+13°
    feels +15°3.0 mm · 60%21 km/hUV 3 · Mod
    06:5319:25
  • Fri, Sep 18Fri
    +16°/+12°
    feels +12°0.6 mm · 29%23 km/hUV 4 · Mod
    06:5519:23
  • Sat, Sep 19Sat
    +17°/+13°
    feels +15°9.6 mm · 49%22 km/hUV 4 · Mod
    06:5619:21
  • Sun, Sep 20Sun
    +16°/+10°
    feels +13°0 mm · 43%17 km/hUV 4 · Mod
    06:5819:18
  • Mon, Sep 21Mon
    +17°/+9°
    feels +16°0.6 mm · 31%19 km/hUV 4 · Mod
    07:0019:16
  • Tue, Sep 22Tue
    +18°/+13°
    feels +15°4.2 mm · 36%28 km/hUV 4 · Mod
    07:0119:14
  • Wed, Sep 23Wed
    +14°/+10°
    feels +9°0.6 mm · 37%25 km/hUV 4 · Mod
    07:0319:12
  • Thu, Sep 24Thu
    +13°/+8°
    feels +8°0 mm · 29%24 km/hUV 4 · Mod
    07:0419:09
  • Fri, Sep 25Fri
    +13°/+7°
    feels +11°0 mm · 36%14 km/hUV 3 · Low
    07:0619:07

Weather Insight

Swansea's 15-day outlook ranges from a low of 7°C to a high of 20°C, with an average daytime high near 17°C. Air quality is currently good (AQI 22), with no notable outdoor health concerns.

Today vs Normal

19°C+2° above normal

The long-term average high for today is 17°C.

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

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

2026-08-28: 19°C19°2026-08-29: 20°C20°2026-08-30: 19°C19°2026-08-31: 18°C18°2026-09-01: 19°C19°2026-09-02: 19°C19°2026-09-03: 20°C20°2026-09-04: 19°C19°2026-09-05: 18°C18°2026-09-06: 23°C23°2026-09-07: 18°C18°2026-09-08: 17°C17°

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 Swansea

Over the next 15 days, Swansea is forecast to see temperatures ranging from 7°C to 20°C, averaging a daily high of 17°C. The extended outlook indicates significant rainfall totalling 59.6 mm spread across 11 days. Conditions are suitable for most outdoor activities; carry an umbrella on days with showers.