Weather in St Ives for September 2025
Until now, September 2025 in St Ives has been nearly identical to the historical average, with a temperature of 16.6 °C (showing only a slight deviation of 0.4 °C).
The forecast for the next days in St Ives predicts temperatures to be around 16 °C, close to the historical average.
In general, the average temperature in St Ives at the beginning of September is 17 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 15.9 °C by the end of September.
St Ives in September brings notable rainfall, with an average of 16 rainy days and a total precipitation of 120.3 mm.
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St Ives Weather September
Temperatures trend during September in St Ives
September weather in St Ives day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Cloudy | 18° /15° | 4.9 mm | 4 | |
| 2 Sept. |  Patchy rain possible | 17° /14° | 5.4 mm | 4 | |
| 3 Sept. | Patchy rain possible | 17° /14° | 6.8 mm | 4 | |
| 4 Sept. | Patchy rain possible | 16° /12° | 4.8 mm | 4 | |
| 5 Sept. | Light rain shower | 16° /13° | 8.4 mm | 4 | |
| 6 Sept. |  Moderate rain | 18° /14° | 10.2 mm | 5 | |
| 7 Sept. | Patchy rain possible | 17° /13° | 3.5 mm | 4 | |
| 8 Sept. | Light rain shower | 17° /14° | 1.9 mm | 4 | |
| 9 Sept. | Cloudy | 15° /13° | 8.3 mm | 4 | |
| 10 Sept. | Light rain shower | 17° /13° | 3.2 mm | 4 | |
| 11 Sept. |  Patchy light drizzle | 15° /12° | 3 mm | 4 | |
| 12 Sept. | Patchy rain possible | 14° /12° | 6 mm | 4 | |
| 13 Sept. |  Partly cloudy | 15° /12° | 3 mm | 4 | |
| 14 Sept. |  Sunny | 16° /12° | 3.5 mm | 5 | |
| 15 Sept. | Cloudy | 16° /13° | 0.9 mm | 4 | |
| 16 Sept. | Patchy rain possible | 16° /14° | 2.5 mm | 0.7 | |
| 17 Sept. | Patchy rain possible | 17° /15° | 0.7 mm | 0.4 | |
| 18 Sept. | Partly cloudy | 18° /16° | 0.1 mm | 1 | |
| 19 Sept. | Patchy rain possible | 18° /14° | 0.8 mm | 0.8 | |
| 20 Sept. | Patchy rain possible | 15° /13° | 0.4 mm | 0.7 | |
| 21 Sept. | Patchy rain possible | 12° /11° | 1.3 mm | 3 | |
| 22 Sept. | Patchy rain possible | 14° /11° | 2.3 mm | 3 | |
| 23 Sept. | Patchy rain possible | 14° /13° | 0.3 mm | 3 | |
| 24 Sept. | Patchy rain possible | 15° /14° | 0.2 mm | 3 | |
| 25 Sept. | Sunny | 15° /11° | 0 mm | 4 | |
| 26 Sept. | Sunny | 15° /10° | 0 mm | 4 | |
| 27 Sept. | Partly cloudy | 16° /12° | 0 mm | 4 | |
| 28 Sept. | Patchy rain possible | 18° /12° | 0.5 mm | 3 | |
| 29 Sept. | Sunny | 17° /12° | 0 mm | 4 | |
| 30 Sept. | Light rain shower | 15° /13° | 1.1 mm | 4 | |
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St Ives in September - FAQ
St Ives water temperatures in September
The average water temperature of the Atlantic Ocean near St Ives in September is 15.5 °C. Temperatures remain fairly consistent throughout the month.
- What is the water temperature in St Ives in September?
- The average water temperature in St Ives in September is 15.5 °C.
- Can you swim in St Ives in September?
- Brisk: quick dips and active swimming are fine, but pack a 2–3 mm spring suit if you plan longer sessions or early-morning outings.
September rainfall patterns in St Ives
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Where is St Ives?Get accurate weather forecasts for St Ives, located at latitude 50.209 and longitude -5.488. Stay updated with localized weather information tailored for St Ives.