Weather in St Ives for September 2026
So far, September 2026 in St Ives is slightly warmer than the historical average by 0.7 °C.
The forecast for the next days in St Ives predicts temperatures to be around 19 °C, close to the historical average.
In general, the average temperature in St Ives at the beginning of September is 17.7 °C. As the month progressed, temperatures tended to noticeably warm up, reaching an average of 20.3 °C by the end of September.
St Ives experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 126.2 mm.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
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° /14° | 3.4 mm | 3 | |
| 2 Sept. |  Patchy rain possible | 18° /14° | 3.9 mm | 3 | |
| 3 Sept. | Patchy rain possible | 18° /15° | 4.7 mm | 3 | |
| 4 Sept. | Patchy rain possible | 17° /13° | 3.5 mm | 3 | |
| 5 Sept. | Light rain shower | 17° /13° | 5.6 mm | 4 | |
| 6 Sept. |  Moderate rain | 19° /14° | 6.9 mm | 4 | |
| 7 Sept. | Patchy rain possible | 17° /14° | 3.1 mm | 3 | |
| 8 Sept. | Light rain shower | 17° /13° | 7.3 mm | 3 | |
| 9 Sept. | Cloudy | 15° /13° | 5.6 mm | 3 | |
| 10 Sept. | Light rain shower | 17° /13° | 2.5 mm | 3 | |
| 11 Sept. |  Patchy light drizzle | 16° /13° | 2.1 mm | 3 | |
| 12 Sept. | Patchy rain possible | 16° /12° | 4 mm | 3 | |
| 13 Sept. |  Partly cloudy | 16° /14° | 2.1 mm | 3 | |
| 14 Sept. |  Sunny | 17° /13° | 2.3 mm | 4 | |
| 15 Sept. | Cloudy | 16° /14° | 2 mm | 3 | |
| 16 Sept. | Patchy rain possible | 16° /13° | 1.4 mm | 3 | |
| 17 Sept. | Sunny | 17° /13° | 1.3 mm | 3 | |
| 18 Sept. | Sunny | 18° /14° | 0.4 mm | 3 | |
| 19 Sept. | Sunny | 19° /14° | 0.1 mm | 5 | |
| 20 Sept. |  Overcast | 18° /15° | 0.4 mm | 4.1 | |
| 21 Sept. | Sunny | 19° /14° | 0 mm | 4.3 | |
| 22 Sept. | Sunny | 20° /15° | 0 mm | 4.1 | |
| 23 Sept. | Overcast | 17° /14° | 0 mm | 3.6 | |
| 24 Sept. | Sunny | 19° /12° | 0 mm | 5 | |
| 25 Sept. | Sunny | 20° /14° | 0 mm | 5 | |
| 26 Sept. | Patchy rain possible | 21° /14° | 0.2 mm | 6 | |
| 27 Sept. | Overcast | 19° /14° | 0.8 mm | 5 | |
| 28 Sept. | Sunny | 23° /15° | 0.1 mm | 6 | |
| 29 Sept. | Overcast | 22° /16° | 0 mm | 6 | |
| 30 Sept. | Overcast | 18° /16° | 0 mm | 4 | |
| Next | |||||
St Ives in September - FAQ
What are the expected maximum and minimum temperatures in St Ives during September?
How much rainfall should be expected in St Ives during September?
What are the typical wind conditions in St Ives during September?
St Ives water temperatures in September
The average water temperature of the Atlantic Ocean near St Ives in September is 15.5 °C. At the beginning of September temperatures are around 15.5 °C; by the end of the month they stay fairly steady and reach 15.4 °C.
- 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
UV exposure in St Ives during September
Quick links
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.