Why does WiFi slow down when it rains in Sylhet?
Rain itself does not directly slow WiFi signals inside your home. The real culprits are the outdoor parts of your internet connection. Copper telephone lines and poorly sealed cable joints absorb moisture, which weakens the signal before it ever reaches your router. Wireless towers lose range in heavy rain due to signal attenuation.
Fiber-optic connections are far more resistant to weather because light travels through glass, not copper. If your connection drops every monsoon, the type of line running to your home is almost certainly the root cause.
1. Check your connection type — fiber vs. copper
The single biggest upgrade you can make is switching from a copper or wireless connection to fiber-to-the-home (FTTH). Fiber lines are sealed glass strands that are immune to water ingress and signal loss from rain. Copper degrades in moisture, and wireless signals scatter in heavy downpours.
If you are on copper or wireless broadband in Sylhet and your connection drops every rainy day, upgrading to a fiber provider like Neef It eliminates the weather problem at its source.
2. Inspect your outdoor cable entry point
Even on a fiber connection, a poorly sealed cable entry point where the line enters your building can let water in. Check where your internet cable comes through the wall or window frame. If you see exposed joints, cracked sealant, or water dripping near the cable, call your ISP to reseal the entry.
A five-minute fix by a technician can prevent months of rainy-day dropouts.
3. Move your router away from windows and exterior walls
During storms, moisture condenses on exterior walls and windows. A router placed right next to a wet wall radiates WiFi into damp surfaces that absorb the signal. Move it to a central, elevated spot — a shelf in the middle of the house, away from windows, is ideal.
This simple repositioning often improves signal strength throughout the house, rain or shine.
4. Keep your router dry and ventilated
High humidity during Sylhet monsoons can cause condensation inside electronic devices. Make sure your router is in a dry, ventilated spot — not inside a closed cabinet or on the floor. Overheating from poor airflow combined with humidity can cause random disconnections and slowdowns.
5. Restart your router and ONT after heavy rain
Power fluctuations during storms can leave your router or ONT (the fiber box) in a confused state. After heavy rain, a simple restart — unplug both devices for 30 seconds, plug the ONT back in first, wait for it to sync, then power on the router — often restores full speed.
6. Use a UPS to prevent power-cycle damage
Sylhet's monsoon season brings frequent power cuts and voltage spikes. Each power cycle stresses your router and can corrupt its settings over time. A small UPS for your router and ONT keeps them running through short outages and protects against surge damage.
7. Call your ISP if the problem persists
If your internet still drops in rain after trying these steps, the issue is likely on the provider's side — a damaged outdoor splice, a waterlogged junction box, or a faulty OLT port. A good ISP will send a technician to inspect the line. Neef It's 24/7 support team can diagnose the problem remotely and dispatch an on-site engineer if needed.