Can You Use a Generator in the Rain?

No — portable generators should not be operated directly in the rain or wet conditions.

Using a generator in rain, snow, or standing water significantly increases the risk of electric shock, equipment damage, and fire. While power outages often occur during storms, operating a generator improperly during wet weather can be extremely dangerous.

This guide explains why generators and rain do not mix, what manufacturers recommend, and how to reduce risk when weather conditions are unavoidable.

Why Rain Makes Generator Use Dangerous

Portable generators combine electricity, fuel, and metal components — all of which become hazardous when exposed to water.

Key risks include

Electric shock from wet outlets, cords, or grounded surfaces
Short circuits that damage internal components
Fire hazards caused by electrical faults
Corrosion that shortens generator lifespan

Even light rain or high humidity can create unsafe operating conditions.

Are Portable Generators Waterproof?

Most portable generators are not waterproof.

While some components may be weather-resistant, generators are not designed to operate while exposed to rain or snow. Manufacturer manuals consistently warn against operating generators in wet environments without proper protection.

If water enters electrical outlets or control panels, the risk of shock increases immediately.

Most generator manufacturers state clearly:

Do not operate generators in rain or wet conditions
Keep generators dry at all times
Operate generators outdoors only, away from water sources

Ignoring these warnings can void warranties and increase the risk of serious injury.

Safe Generator Placement During Storms

If a generator must be used during storm-related outages, placement becomes critical.

Safer placement guidelines

Place the generator outdoors only
Maintain at least 20 feet of distance from buildings
Elevate the generator to prevent water pooling
Direct exhaust away from doors, windows, and vents

Never operate a generator in a garage, basement, crawl space, or enclosed area — even if rain is heavy.

For indoor-related risks, see:
Can You Use a Generator Indoors?

Can You Use a Generator Tent or Canopy?

Yes — generator tents or canopies designed specifically for ventilation can reduce rain exposure.

However, important conditions apply:

The cover must allow full airflow
Exhaust must remain unobstructed
The generator must still be placed outdoors
Water must not collect underneath the generator

Never use tarps, plastic sheets, or improvised covers. These can trap exhaust gases and increase carbon monoxide risk.

Extension Cords and Wet Conditions

Rain increases electrical hazards through extension cords.

Cord safety tips

Use outdoor-rated, heavy-duty extension cords only
Keep connections off the ground
Avoid standing water and puddles
Never touch cords or outlets with wet hands

Damaged or wet cords significantly increase the chance of electric shock.

Carbon Monoxide Risk Still Applies — Even in Rain

Rain does not reduce carbon monoxide danger.

Generators produce CO continuously, regardless of weather. Wind shifts during storms can even force exhaust gases back toward buildings.

For full CO safety guidance, see:
Portable Generator Safety Checklist

Common Mistakes People Make During Storms

During outages, many users make unsafe decisions under pressure:

Running generators in garages to avoid rain
Using tarps to “protect” the generator
Operating generators too close to buildings
Ignoring wet extension cords

These mistakes account for many generator-related injuries each year.

What to Do If Rain Is Unavoidable

If weather conditions are unavoidable:

Delay generator use until rain subsides if possible
Use a manufacturer-approved generator cover
Elevate the generator on a dry platform
Inspect all cords and outlets before use
Shut down immediately if water contacts electrical components

Safety should always outweigh convenience.

Final Verdict: Can You Use a Generator in the Rain?

Portable generators should never be used directly in the rain.

If power is critical during storm conditions, proper placement, ventilation, elevation, and approved weather protection are essential. Improvised solutions increase risk and should be avoided.

When in doubt, shut the generator down and wait for safer conditions.