Keswick Weather in September
September in Keswick brings moderate temperatures around 17°C (63°F) during the day, dropping to 10°C (50°F) at night, with quite a bit of rainfall expected, averaging around 112 mm (4.4 in) for the month.
Rainfall in Keswick in September
You can expect rain on around 19 days based on historical patterns, with 112 mm (4.4 in) average for the month. This is a wet month with frequent and often heavy showers. Both the number of rain days and the total rainfall are high.
Temperature in Keswick in September
In September, expect moderate temperatures in Keswick, with highs of 17°C (63°F) and lows of 10°C (50°F) at night. Even when the weather is stable, mornings and evenings can still feel distinctly cool. With lows around 10°C (50°F), nights are cold. The upside is that cool, crisp nights are often the best for a deep sleep.Should you favor a climate that's both dry and comfortably warm, May, July and August typically offer the most agreeable circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United Kingdom, check out our Keswick's climate page.
Keswick Temperature in September
Min Temperature
10°C (50°F)
Max Temperature
17°C (63°F)
Chance of Rain
64%
Precipitation
112 mm (4.4 in)
Rainy days
19 days
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Keswick typically stay consistent throughout September, with daily highs averaging around 17°C (63°F). Nights are cool, with lows typically ranging from 8°C (46°F) to 11°C (52°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Keswick in September
Browse day-by-day weather records for Keswick spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Keswick historical weather extremes in September
Our historical data for Keswick spans 1976 to 2025, revealing these weather extremes.
- On September 8, 2021, temperatures climbed to 28°C (82°F), marking the warmest September day on record.
- The coldest September day was on September 9, 1976, with a maximum of 9°C (48°F).
- Keswick registered its coldest September night on September 22, 1979, with temperatures dropping to -2°C (28°F).
- The heaviest September precipitation occurred on September 20, 2023, when 63 mm (2.5 in) of precipitation fell.
Best Places in the United Kingdom in September
Find out more about the weather in the United Kingdom and which places have the best travel conditions in this month. See all of the United Kingdom in September →
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What to Wear in Keswick in September
Comfortable temperatures call for an easy wardrobe in September. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Expect heavy rainfall, so bring good rain protection and waterproof bags.What To Do in Keswick in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United Kingdom, check out our Keswick's climate page.
See the full Keswick climate overview or explore weather in the United Kingdom.
