Router Overheating: How Hot Is Too Hot, and How Do You Cool It Down?

Most routers feel warm to the touch, and that alone is not a problem. Heat becomes a problem when the router can’t get rid of it: performance drops, connections get flaky, and eventually the router restarts itself to avoid damage. The good news is that the fix is usually about where the router sits, not about buying a new one.

Warm Is Normal — Up to a Point

Routers are always on, and their processors and radios produce heat around the clock. Manufacturers design for this, within limits set by the room temperature, not the case temperature:

• NETGEAR says its Orbi devices operate safely in temperatures up to 40 °C (104 °F).
• For its mobile hotspots and mobile routers, NETGEAR gives a safe ambient range of 0–35 °C (32–95 °F).

Your model’s exact range is in its datasheet or manual, usually under “operating temperature”. If the room is within that range and the router is warm but works normally, there is nothing to fix.

Signs of Overheating

• Slower speeds and dropped connections when the router is hot. Xfinity notes that heat reduces gateway performance and can cause connectivity issues.
• The router restarts on its own. Xfinity’s gateways reboot automatically when they detect a temperature above the safe operating range, to prevent damage. NETGEAR’s hotspots first cut back performance and then shut down completely if they keep getting hotter.
• It is too hot to keep your hand on, smells of hot plastic, or the problems get worse on warm afternoons and better at night.

If the router restarts at the same time every day instead, it is more likely a reboot schedule or automatic update — see router keeps restarting.

Placement and Airflow

This is where most overheating comes from. Xfinity and NETGEAR advise:

• Not on carpet, rugs, blankets, beds or couches — soft surfaces block the vents and trap heat.
• Not in cabinets, drawers or enclosed shelves, where vents are blocked or air can’t move.
• Away from heat vents and direct sunlight.
• Away from other electronics such as game consoles and stereo receivers or amplifiers, which add their own heat.
• Dust it. Wipe dust off the top, back and bottom with a dry cloth so the vents stay open.

Also avoid stacking the router on top of the modem or another box: each warms the other, and the vents on top or bottom get covered. Stand the router the way the manufacturer shows in its manual, so the vents stay clear.

Moving the router out of a cabinet often improves Wi-Fi too, since walls and furniture weaken the signal — see how to boost Wi-Fi signal and Wi-Fi dead zones.

Load, Firmware and Settings

A busy router works harder and runs hotter. NETGEAR suggests limiting the number of simultaneous connections and bandwidth-heavy activity in hot conditions, and keeping the firmware up to date, since updates can include thermal management improvements.

In practice:

• Update the firmware — see how to update router firmware.
• Check what is using the connection — large downloads, cloud backups or a forgotten torrent client keep the router at full load. See who is connected to my Wi-Fi.
• Turn off features you don’t use, such as a VPN server running on the router, which keep the processor busy.

For mobile hotspots specifically, NETGEAR recommends removing the battery or battery cover and running on mains power (Plugged In mode) for long sessions — the device can then run cooler and faster.

When the Hardware Is the Problem

If the router overheats in a cool room, in the open, with clean vents and normal use, something is wrong with the device:

• A failing power adapter can run hot and cause restarts. Use the original adapter or an exact replacement with the same voltage, current and polarity.
• An internal fan (some gateways have one) may have stopped.
• The router is old and was never fast enough for your current load.

At that point, contact the manufacturer or your provider — if the router is theirs, they can replace it. If it is yours and several years old, see how often should I replace my router. A small USB fan pointed at the router can help in a hot room in the meantime, but it is a workaround, not a fix.