Llandudno Weather in September
With daytime temperatures of 18°C (64°F) and nighttime lows of 11°C (52°F), September in Llandudno brings moderate temperatures during the day. Do keep in mind that quite a bit of rainfall is typical. Around 90 mm (3.5 in) falls on average.
Rainfall in Llandudno in September
Expect around 17 days of rain based on historical data, with 90 mm (3.5 in) average. The rainfall pattern this month is fairly balanced. Showers tend to be moderate rather than extreme.
Temperature in Llandudno in September
Expect highs of 18°C (64°F) in Llandudno in September, with nights dropping to around 11°C (52°F). A light jacket or extra layer can be useful, especially outside the warmest hours of the day. Nights cool down to 11°C (52°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.
Sunshine in Llandudno in September
The month brings about 111 hours of sunlight, offering a comfortable mix of sun and overcast.If your ideal day consists of dry skies and pleasant temperatures, July typically offers the best circumstances for Llandudno.
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 Llandudno's climate page.
Llandudno Temperature in September
Min Temperature
11°C (52°F)
Max Temperature
18°C (64°F)
Chance of Rain
56%
Precipitation
90 mm (3.5 in)
Rainy days
17 days
Sunshine
111 hours *
Percentage Sunshine
*
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Llandudno typically stay consistent throughout September, with daily highs averaging around 18°C (64°F). Nights are cool, with lows typically ranging from 10°C (50°F) to 12°C (54°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 Llandudno in September
Browse day-by-day weather records for Llandudno spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Llandudno historical weather extremes in September
Based on 49 years of weather observations in Llandudno between 1976 and 2025, these are the recorded extremes.
- The hottest September day on record in Llandudno reached 27°C (81°F) (September 8, 2021).
- The coldest September day was on September 27, 2007, with a maximum of 11°C (52°F).
- Nighttime temperatures dropped to 1°C (34°F) on September 19, 1986, marking the coldest September night on record.
- The heaviest September precipitation occurred on September 20, 2025, when 51 mm (2 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 Llandudno in September
For Llandudno in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. Bring sunglasses since you'll have some sunny periods throughout the monthWhat To Do in Llandudno 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 Llandudno's climate page.
See the full Llandudno climate overview or explore weather in the United Kingdom.
