Chester Zoo is leading a nationwide push to change how weather forecasts are displayed on popular apps, warning that misleading rain icons could be costing some venues up to £137,000 in a single day.

The zoo has coordinated a joint approach to the Met Office on behalf of more than 80 outdoor attractions, including the Eden Project, RHS Gardens, Blackpool Pleasure Beach and Blenheim Palace, arguing that a single raincloud icon summarising a 24-hour period can create the impression of a washout - even when much of the day is dry.

Operators say families often make decisions based on a quick glance at a phone screen. If they see a raincloud, plans are cancelled.

Tourism contributes £147bn annually to the UK economy, with domestic day trips worth more than £50bn. Attractions say spontaneous visits are highly weather-dependent, and research suggests around 70% of people check forecasts before heading out.

Some sites report attendance dropping by up to 30% following an unfavourable forecast. A 30% reduction in visits on bank holiday Monday in August would equate to a loss of income of approximately £137,000 to Chester Zoo.

The group stresses it is not challenging forecast accuracy - but how the information is visually presented, particularly by third-party apps that may show overnight rain as an all-day rain symbol.

"When families see a raincloud icon, many simply stay home," said Dom Strange, chief operating officer of Chester Zoo.

"The reality might be a brief shower at 6am - but the symbol suggests a washout. As the national zoo and one of the UK's leading attractions, we're speaking up for the wider visitor economy - from heritage sites to theme parks - and the thousands of jobs that depend on spontaneous visits.

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"The Met Office is the UK's most trusted weather authority and in a unique position to help lead the way on clearer forecasting so other apps follow their leads.

"With today's data and technology, there's an opportunity to present forecasts in a way that better reflects how the day will actually feel on the ground."

Attractions are now calling for a roundtable with the Met Office, government and major weather app developers to explore practical improvements - including separate daytime and overnight weather icons, clearer written summaries such as "showers early, brighter later" and indicators showing the proportion of expected dry hours.

Clearer presentation, they argue, would give families confidence to plan - and protect thousands of jobs across the UK visitor economy.

Olly Reed, marketing director at tourism consultancy Navigate revealed that across the sites it supports, visits can drop by an average of around 30% when an unfavourable weather icon appears,

He said: "Bookings don't just shift with the weather itself, they shift with how that weather is framed.

"In a sector driven by spontaneity, small design choices in forecast presentation can have disproportionate economic consequences. Credit to Chester Zoo for helping shine a light on this."

Blackpool Pleasure Beach Resort has also backed the call for clearer forecast presentation, stating how in the current economic climate, it is clear that families see a day out "as a considered investment, rather than the throwaway discretionary spend of old".

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James Cox, director of marketing, sales & PR at Blackpool Pleasure Beach Resort, added: "They are cautiously waiting for all deciding factors to align to ensure their investment guarantees the best possible day out. The impact of the weather forecast is therefore intensified, particularly for outdoor attractions.

"A significant amount of our bookings come within 24 hours before any given day, because people rely on that weather icon.

"Accurate reports with imagery that better reflects overall conditions are vital. This will help families plan with confidence and provide greater stability for attractions and the wider visitor economy, which depend on accurate forecasting to trade successfully."