15-Day Weather Forecast - St Petersburg

15-day weather forecast for St Petersburg: temperatures from 9°C (48°F) to 18°C (64°F). Average daily high 16°C (61°F) over the next 15 days.

Hourly Forecast by Day

Today·11 Sep
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Temperature · peaks at +14°C

15-Day Temperature Trend

14°13°TodaySep16°13°Tmrw16°13°Sun17°12°Mon18°11°Tue18°11°Wed15°12°Thu17°11°Fri17°12°Sat15°11°Sun15°10°Mon15°10°Tue14°11°Wed15°9°Thu11°9°Fri
Colour scale for daily high temperature bars

15-Day Weather Forecast

Updated just now
  • Date
    High / Low
  • Fri, Sep 11Today
    +14°/+13°
    feels +12°2.9 mm · 100%22 km/hUV 2 · Low
    06:1619:32
  • Sat, Sep 12Tomorrow
    +16°/+13°
    feels +14°0.3 mm · 24%20 km/hUV 3 · Mod
    06:1919:29
  • Sun, Sep 13Sun
    +16°/+13°
    feels +16°7.7 mm · 72%16 km/hUV 3 · Low
    06:2119:26
  • Mon, Sep 14Mon
    +17°/+12°
    feels +17°2.8 mm · 39%11 km/hUV 1 · Low
    06:2319:23
  • Tue, Sep 15Tue
    +18°/+11°
    feels +18°0 mm · 12%6 km/hUV 2 · Low
    06:2619:20
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  • Wed, Sep 16Wed
    +18°/+11°
    feels +17°0 mm · 35%14 km/hUV 3 · Low
    06:2819:17
  • Thu, Sep 17Thu
    +15°/+12°
    feels +14°7.2 mm · 47%13 km/hUV 2 · Low
    06:3019:14
  • Fri, Sep 18Fri
    +17°/+11°
    feels +15°0 mm · 39%13 km/hUV 3 · Low
    06:3319:11
  • Sat, Sep 19Sat
    +17°/+12°
    feels +15°4.2 mm · 54%14 km/hUV 1 · Low
    06:3519:08
  • Sun, Sep 20Sun
    +15°/+11°
    feels +13°13.8 mm · 38%15 km/hUV 2 · Low
    06:3719:05
  • Mon, Sep 21Mon
    +15°/+10°
    feels +13°6.0 mm · 43%16 km/hUV 1 · Low
    06:4019:02
  • Tue, Sep 22Tue
    +15°/+10°
    feels +11°3.0 mm · 51%23 km/hUV 2 · Low
    06:4218:59
  • Wed, Sep 23Wed
    +14°/+11°
    feels +10°9.8 mm · 42%27 km/hUV 2 · Low
    06:4418:56
  • Thu, Sep 24Thu
    +15°/+9°
    feels +12°0.4 mm · 43%19 km/hUV 2 · Low
    06:4718:52
  • Fri, Sep 25Fri
    +11°/+9°
    feels +10°16.0 mm · 36%12 km/hUV 2 · Low
    06:4918:49

Weather Insight

St Petersburg's 15-day outlook ranges from a low of 9°C to a high of 18°C, with an average daytime high near 15°C. Air quality is currently good (AQI 40), with no notable outdoor health concerns.

Today vs Normal

14°C-1° below normal

The long-term average high for today is 15°C.

13 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: 20°C20°2026-08-29: 21°C21°2026-08-30: 16°C16°2026-08-31: 22°C22°2026-09-01: 21°C21°2026-09-02: 19°C19°2026-09-03: 19°C19°2026-09-04: 14°C14°2026-09-05: 17°C17°2026-09-06: 13°C13°2026-09-07: 14°C14°2026-09-08: 19°C19°

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 St Petersburg

Over the next 15 days, St Petersburg is forecast to see temperatures ranging from 9°C to 19°C, averaging a daily high of 15°C. The extended outlook indicates significant rainfall totalling 74.1 mm spread across 12 days. Conditions are suitable for most outdoor activities; carry an umbrella on days with showers.