Broadband Speeds in Cardiff South and Penarth
Real-world broadband speed data from Q3 2025. See how Cardiff South and Penarth compares for both download and upload speeds.
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How Fast is Broadband in Cardiff South and Penarth?
Based on real-world speed tests collected by ThinkBroadband in Q3 2025, Cardiff South and Penarth has a median download speed of 89.4 Mbps and a median upload speed of 19.1 Mbps.
This constituency has "Good" download speeds and "Basic" upload speeds. The 19.1 Mbps median upload may cause issues for video conferencing and cloud backups. Consider full fibre if available.
Speed Comparison for Cardiff South and Penarth
Understanding the Speed Data
The speed data shows the distribution of actual speeds achieved by users in Cardiff South and Penarth:
What the Numbers Mean
- Bottom 20%: Slowest fifth of connections
- Median: Typical speed (50% faster, 50% slower)
- Mean: Mathematical average
- Top 20%: Fastest fifth of connections
Why Median Matters Most
The median is the most reliable measure of typical performance. Unlike the mean, it isn't skewed by extremely fast or slow connections. If you move to Cardiff South and Penarth, you can expect speeds around 89.4 Mbps download and 19.1 Mbps upload.
Broadband Coverage in Cardiff South and Penarth
Coverage statistics from Ofcom show what connection types are available in this constituency:
Cardiff South and Penarth has very good full fibre coverage at 88.9%. Most residents can access full fibre connections with symmetric upload speeds.
Speed Recommendations for Cardiff South and Penarth
Based on the actual speeds in Cardiff South and Penarth, here's what different activities require:
Video Conferencing (Zoom, Teams)
Typical speeds in this constituency are adequate for this activity.
Cloud Backup & File Uploads
May need a faster connection for optimal performance.
Online Gaming
Typical speeds in this constituency are adequate for this activity.
Multiple Users (4+ devices)
May need a faster connection for optimal performance.
Frequently Asked Questions
What is the average broadband speed in Cardiff South and Penarth?
In Cardiff South and Penarth, the median download speed is 89.4 Mbps and the median upload speed is 19.1 Mbps. The top 20% of connections achieve 189.8 Mbps download and 61.6 Mbps upload.
Is full fibre broadband available in Cardiff South and Penarth?
Yes, full fibre (FTTP) broadband is available to 88.9% of properties in Cardiff South and Penarth. Gigabit-capable broadband covers 94.1% of premises.
How does Cardiff South and Penarth compare for upload speeds?
Cardiff South and Penarth has basic upload speeds with a median of 19.1 Mbps. This is important for video calls, cloud backups, and working from home.
About This Data
Speed data is sourced from ThinkBroadband (Q3 2025 measurements). Coverage data from Ofcom Connected Nations 2025. Actual speeds at your address may vary based on connection type, provider, and network conditions.