Snowdonia in September for Hiking
Planning Snowdonia
Looking for an overview of all seasons?
Climate Score
45/100 (Suboptimal for Hiking)
Temperature
12°C Average
Rainfall
High (Monsoon influence)
The Verdict
Suboptimal for Hiking
Wait! Before you book Snowdonia in September...
We strongly recommend making a choice: upgrade your outdoor activities trip to a better destination, or make sure you book accommodations equipped for challenging weather.
These destinations are MUCH better for outdoor activities in September
Going anyway? Book stays with great indoor facilities
If your dates are locked, don't let poor conditions ruin your trip. Prioritize accommodations with indoor pools, spas, or excellent communal areas. Avoid remote locations where getting stuck inside implies boredom.
domain Find bad-weather safe staysLooking for better outdoor activities weather in Snowdonia?
These months historically score high for outdoor activities.
🌧️ Hiking in Snowdonia in September anyway?
⚠️ Trail condition risksWhile September isn't ideal for hiking in Snowdonia due to difficult conditions, if your dates are locked, base yourself in a town with alternative activities or easily accessible lower-elevation trails.
Seasonality
Atmosphere
Daily Peak
16°C
Rain Volume
169mm
Outdoor activities conditions breakdown
Official weather & climate data for September in Snowdonia
Temperature & Sun
Rain & Humidity
Final Analysis
Suboptimal for Hiking
View best months for outdoor activities in Snowdonia arrow_forwardYear-over-Year comparison
View all 12 months for outdoor activities in Snowdonia to find the perfect window for your trip.
Best months for outdoor activities in Snowdonia
See at a glance which months offer the best conditions — based on climate scores.
September in Detail
Score: 45/100Temp
12°C
Average
Precip
168.6mm
Rainfall
Verdict
Cool temperatures. High rain conditions.
If you're visiting in September, prioritize highly-rated indoor properties or hotels near public transport.
→ Best bad-weather friendly staysWhat is the weather like in Snowdonia in September for Outdoor activities?
Cooler than August, and slightly wetter.
For additional context, compare outdoor activities in August and October for Snowdonia.
The climate score of 45/100 for outdoor activities in September is an objective measurement based on 30-year historical weather normals. This rating considers temperature, precipitation, and humidity thresholds specific to outdoor activities.
How does Snowdonia compare for outdoor activities?
Not sure yet?
Cross-reference Snowdonia with other top outdoor activities destinations to find your ultimate match.
map If September is fixed, consider these alternatives
September offers suboptimal for hiking outdoor activities conditions in Snowdonia. These destinations historically perform better for outdoor activities in September:
Methodology
Whirago climate scores are calculated using 30-year historical climate normals. Our proprietary "Comfort Index" weights temperature, precipitation frequency, and humidity against activity-specific thresholds (e.g., higher heat tolerance for beach vs. trekking). Seasonal classifications are determined by the 70th and 85th percentiles of historically stable conditions.
Plan your perfect hiking trip to Snowdonia
Now is one of the best times to visit — here’s how to make the most of it:
Where to stay
Find basecamps, mountain lodges, and hand-picked hotels close to the trails in Snowdonia:
Hiking & Tours
Find suitable trails, book guided hikes, and find top outdoor experiences in Snowdonia:
Stay connected
Secure mobile data for trail maps and navigation with a reliable local eSIM: