Why is my Wi-Fi slow in the evening?
Evening slowdowns usually have three causes, and only one of them is your broadband company's fault. Here's how to tell which one you have.
Updated 11 August 2026 · about 5 minutes to read
If your internet is fine all day and then goes sluggish after teatime, you are not imagining it. Between roughly 7pm and 11pm, more people in your street are online, more devices in your own home are awake, and the airwaves around your router get crowded. The good news is that you can usually work out which of those three is happening in about ten minutes, without touching a single setting.
Cause 1: your own house is busy
This is the most common one and the easiest to spot. Someone is streaming in 4K, a games console is downloading an update in the background, and a phone is backing up photos. All of that shares one connection.
To check: while things feel slow, pause or switch off everything except the device you are testing on, wait one minute, then try again. If it perks up straight away, your line is fine — you simply have more demand than headroom at that hour.
- Game consoles download updates on standby — turn off 'rest mode' downloads.
- Cloud photo backup usually runs overnight, but starts as soon as a phone hits Wi-Fi.
- A single 4K stream typically wants 25 Mbps of steady, uninterrupted bandwidth.
Cause 2: the Wi-Fi in the room, not the broadband
Wi-Fi is radio. In the evening your neighbours' routers, baby monitors, smart plugs and Bluetooth speakers are all talking at once, and thick walls do the rest. The line coming into your house can be perfectly healthy while the last few metres through the air are the bottleneck.
To check: run a speed test standing next to the router, then run the same test in the room where it feels slow. A big gap between the two means the problem is coverage inside your home — not the service you pay for.
Cause 3: the street is busy
Some networks share capacity between homes in an area. If everyone streams at once, everyone slows down a little. This shows up as a slowdown that happens even when you are plugged in by cable and even when nothing else in your house is running.
To check: connect a laptop to the router with an Ethernet cable and test again in the evening and again the next morning. If the cabled result drops in the evening too, that is a network capacity question for your provider — and it is worth reporting, with the times and numbers written down.
What to do next
Write down three tests: next to the router, in the slow room, and over a cable. Note the time. Two evenings of that is enough evidence for any support agent to take you seriously, and it stops the conversation going round in circles.
In short
- ✓ Test next to the router, in the slow room, and over a cable — the pattern tells you the cause.
- ✓ A big room-to-router gap means coverage, not your broadband speed.
- ✓ A slow cabled test in the evening only is worth reporting to your provider.