Many election booths across New South Wales were drenched by rain and thunderstorms today, turning how-to-vote flyers into paper mâché.

The state's slopes, ranges and coast were impacted the most, some places gaining the heaviest downpours in months.

Some of the most challenging booths to vote in were those in the Tuncurry, Trunkey, Wootton, Gunnedah, Kindee and Goulburn areas, all dealing with more than 30mm of rain between 9am and 6pm.

In just nine hours, while booths were open, about a month's worth of rain fell at Gunnedah (49mm) and Trunkey (63mm) and about half-a-month worth at Tuncurry (72mm) and Wootton (54mm).

Much of this rain came down in torrential downpours. In just 30 minutes 52mm fell at Trunkey and 30mm at Goulburn, sending some volunteers and voters into panic mode. Volunteers were seen to be scraping wet paper off the ground while voters scurried inside empty-handed.

Some voters even pretended to mark all the boxes below the line on the Upper House form, just to avoid the rain outside.

Image: satellite, radar, rainfall observations and synoptic pattern at 6pm EDT 25 Mar 2023

Rain and storms were still falling into the evening and are likely to disturb vote counters into the night thanks to an active and slow-moving low-pressure trough fuelled by humid winds.