Snowdonia National Park in september: average Weather, Temperature and Climate
Weather in Snowdonia National Park in september 2025
The weather in Snowdonia National Park in september comes from statistical datas on the past years. You can view the weather statistics for the whole month, but also navigating through the tabs for the beginning, the middle and the end of the month.
Average weather throughout september
tolerable weather
Weather at 6am
50°F
Cloudy
34% of time
21%
16%
13%
Weather at 12pm
56°F
Cloudy
35% of time
22%
20%
17%
Weather at 6pm
54°F
Cloudy
26% of time
24%
22%
20%
Weather at 3am
50°F
28%
18%
17%
15%
Evolution of daily average temperature and precipitation in Snowdonia National Park in september
These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in Snowdonia National Park in september.
The climate of Snowdonia National Park in september is tolerable
The weather in september in Snowdonia National Park is wet (with 5in of rainfall over 7 days). It should be noted an improvement from the previous month since in august it receives an average of 5.8in of precipitation over 8 days.
The climate is quite cold there september, but it is bearable when dressing hot. Temperatures are up to 58°F. In the morning the temperature drops to 49°F. Thus, the mean temperature average on this month of september in Snowdonia National Park is 54°F. Note that seasonal normals are in contrast with those observed in Snowdonia National Park in september with a maximum record of 77°F in 2011 and a minimum record of 38°F in 2010. You can hope to have about 3 days with temperatures above 65°F, or 10% of time.
Day length in Snowdonia National Park in september is 12:40. The sun rises at 05:51 and sunset is at 18:31.
With proper weather, the month of september is okay (but not good) to go in this locality.
September: another location in Wales?
If you want to go to Wales in september, there are destinations with better weather than Snowdonia National Park:
In september, Cardiff, Conwy, Holyhead, Pembrokeshire, Swansea and Aberystwyth have good weather.
Seasonal average climate and temperature of Snowdonia National Park in september
Check below seasonal norms These datas are compiled from the weather statements of the last years of september.
| September | |||||
| Outside temperature | |||||
| Average temperature | 54°F | ||||
| Highest temperature | 58°F | ||||
| Lowest temperature | 49°F | ||||
| Highest record temperature | 77°F (2011) | ||||
| Lowest record temperature | 38°F (2010) | ||||
| Number of days at +65°F | 3 day(s) (10%) | ||||
| Sea temperature | |||||
| Average sea temperature | 61°F | ||||
| Lowest sea temperature | 59°F | ||||
| Highest sea temperature | 62°F | ||||
| Wind | |||||
| Wind speed | 19km/h | ||||
| Wind temperature | 45°F | ||||
| Precipitation (rainfall) | |||||
| Rainfall | 5in | ||||
| Number of days with rainfall | 7 day(s) (24%) | ||||
| Record daily rainfall | 2.2in (2012) | ||||
| Snowfall | 0cm | ||||
| Other climate data | |||||
| Humidity | 93% | ||||
| Visibility | 8.71km | ||||
| Cloud cover | 60% | ||||
| UV index | 4 | ||||
| Daily sunshine hours | 10 | ||||
| Sunrise and sunset | |||||
| Time of sunrise | 05:51 | ||||
| Time of sunset | 18:31 | ||||
| Length of day | 12:40 | ||||
| Our opinion about the weather in september | |||||
| Our opinion at whereandwhen.net | tolerable | ||||
How was the weather last september?
Here is the day by day recorded weather in Snowdonia National Park in september 2024:
56°F to 67°F
52°F to 67°F
43°F to 59°F
47°F to 58°F
50°F to 65°F
61°F to 72°F
56°F to 63°F
54°F to 59°F
45°F to 54°F
47°F to 50°F
43°F to 47°F
41°F to 45°F
41°F to 52°F
47°F to 52°F
50°F to 54°F
52°F to 56°F
49°F to 63°F
54°F to 65°F
56°F to 65°F
54°F to 65°F
56°F to 65°F
54°F to 65°F
52°F to 63°F
45°F to 49°F
43°F to 49°F
47°F to 54°F
41°F to 47°F
41°F to 47°F
43°F to 49°F
45°F to 54°F
Map: other cities in Wales in september
Cities near Snowdonia National Park:
| Conwy in september | good weather |
| Llandudno in september | good weather |
| Barmouth in september | tolerable weather |
| Amlwch in september | good weather |
| Holyhead in september | good weather |
| Buckley in september | good weather |
| Aberystwyth in september | good weather |
| Newtown in september | tolerable weather |
| Llandrindod Wells in september | tolerable weather |
| Fishguard in september | good weather |
| Brecon Beacons (National Park) in september | tolerable weather |
| Carmarthen in september | good weather |
Click over cities on the map for information about the weather in september.
Snowdonia National Park
perfect weather
good
tolerable
bad
very bad
Weather data for Snowdonia National Park in september:
Weather data for Snowdonia National Park for september are derived from an average of the weather forecast since 2009 in Snowdonia National Park. There is a margin of error and these forecasts are to be considered as general information only. The weather in Snowdonia National Park can vary slightly from year to year, but this data should limit surprises. So you can pack your bags or check for the best time in year to go to Snowdonia National Park.