St Ives
September
Weather in St Ives for September 2026
Your guide to St Ives weather in September - trends and predictions
In general, the average temperature in St Ives at the beginning of September is 17 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 14.9 °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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Temperatures
Rain 🌧️
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14
Dry days
16
Rainy days
0
Snow days
16°/13°
Temperatures
30 km/h
Avg max wind
80 %
Avg humidity
St Ives Weather September
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Temperatures trend during September in St Ives
See the weather trend as well as the moving average line
September weather in St Ives day by day
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| 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 | 17° /13° | 0.9 mm | 4 | |
| 17 Sept. | Sunny | 17° /13° | 0.2 mm | 5 | |
| 18 Sept. | Sunny | 19° /14° | 0 mm | 5 | |
| 19 Sept. | Sunny | 19° /14° | 0.1 mm | 5 | |
| 20 Sept. | Light rain shower | 17° /13° | 9 mm | 4 | |
| 21 Sept. |  Patchy light rain with thunder | 15° /12° | 11 mm | 4 | |
| 22 Sept. | Light rain shower | 15° /11° | 3.3 mm | 4 | |
| 23 Sept. | Light rain shower | 15° /12° | 2.5 mm | 4 | |
| 24 Sept. | Patchy rain possible | 15° /11° | 0.1 mm | 4 | |
| 25 Sept. | Light rain shower | 16° /11° | 3.6 mm | 5 | |
| 26 Sept. |  Moderate or heavy rain with thunder | 15° /11° | 10.7 mm | 4 | |
| 27 Sept. | Light rain shower | 13° /11° | 4.1 mm | 3 | |
| 28 Sept. | Patchy rain possible | 14° /11° | 0.1 mm | 3 | |
| 29 Sept. | Light rain shower | 16° /11° | 6.4 mm | 4 | |
| 30 Sept. | Light rain shower | 15° /12° | 0.6 mm | 5 | |
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Important Notice
Our weather forecast for St Ives in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the St Ives forecast closer to your planned date for the most up-to-date weather information.
Change Month
St Ives in September - FAQ
What are the expected maximum and minimum temperatures in St Ives during September?
Enjoy moderate daytime temperatures of up to 16° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in St Ives during September?
Significant rainfall exceeding 120.3 mm is expected in St Ives during September, occurring over more than 16 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in St Ives during September?
The average wind speed in St Ives during September is 30 km/h, suggesting breezy to windy conditions, depending on your activities.
St Ives water temperatures in September
The average water temperature of the Atlantic Ocean near St Ives in September is 15.2 °C. At the beginning of September temperatures are around 15.5 °C; by the end of the month they get a bit cooler and reach 14.9 °C.
- What is the water temperature in St Ives in September?
- The average water temperature in St Ives in September is 15.2 °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
Explore the daily rainfall trends and prepare for St Ivess September weather 💧
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