7-day spray forecast · AU · NZ · US · UK

Know your best window before you spray.

SprayCast reads the week ahead — wind, direction and rain — scores every day and every hour, and tells you the one window worth loading the boom for. Spray records for farm businesses and contractors — one account for your whole team of operators.

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7 daysForecast horizon
1,480Herbicides · 4 countries
Weather sourcesWillyWeather · Open-Meteo
Current conditions and 7-day spray forecast Weekly spray summary and best window Day detail with wind and rain charts Hour-by-hour wind speed and rating
Current conditions and 7-day spray forecast
What is SprayCast

The right conditions. The right day. No guesswork.

SprayCast is a spray forecast and record-keeping tool for farmers and contractors. It pulls the next 7 days from your closest weather station, scores every day green, amber or red, and highlights the single best window to spray.

Wind speed and rain probability rolled into one clear call for every day, with wind direction, temperature, humidity and current Delta T alongside.

Available in Australia, New Zealand, USA and UK. Your closest weather station, your actual conditions.

7-day spray forecast

Every day scored on wind and rain risk, so you plan spray runs in advance instead of scrambling at the last minute.

Optimal spray window

The algorithm weighs the full week and highlights your best window. One clear recommendation, not a wall of numbers.

24-hour daily breakdownPro

Drill into any day hour by hour, so you know exactly when to load up and when to hold off.

Available across 4 countries

Australia uses the WillyWeather BOM network. New Zealand, USA and UK are powered by Open-Meteo.

Boom spray tractor working a green crop paddock

Right conditions.
Right result.

Spray in the wrong conditions and you're wasting product, damaging neighbours' crops, and potentially breaching label requirements. SprayCast takes the guesswork out of the timing.

The smart bit

The algorithm does the hard work.

SprayCast doesn't just show you a weather forecast. It analyses the conditions and tells you when to go.

01

Pulls the 7-day forecast

Live data from your chosen location. Australian stations use the WillyWeather BOM network. New Zealand, USA and UK use Open-Meteo high-resolution global data.

02

Scores each window

Wind speed and rain probability are scored against set thresholds across every period of the forecast, with wind direction shown alongside.

03

Finds your best window

The single optimal spray window in the next 7 days — the period where conditions best line up for effective, on-label application.

04

Hour-by-hour detail

On Pro, drill into any day for a full 24-hour breakdown — wind and rain probability charted hour by hour, plus an hourly wind table.

What SprayCast tracks

The conditions that matter.

Each day is rated Good, Marginal or No spray. The thresholds are the same ones you'd apply yourself — SprayCast just applies them to every hour of the week for you.

Wind speed

Too fast and you're drifting onto neighbours. Too calm and inversion conditions can carry spray unpredictably. SprayCast flags the sweet spot.

Good ≤15 · Marginal 16–25 · No spray >25 km/h

Wind direction

Know which way the breeze is heading before you start. Critical for paddocks near sensitive areas, waterways or neighbours.

16-point compass, every hour

Temperature

High temperatures affect product efficacy and increase volatilisation risk. See when temps are inside the label range.

Daily range · metric or imperial

Humidity

Low humidity speeds drying and can reduce uptake. High humidity helps some products. See the current relative humidity at a glance.

Relative humidity %

Rainfall probability

Spray before rain and you've wasted product and time. Rain risk is flagged across the full 7-day window so you never get caught out.

Good <20 · Marginal 20–50 · No spray >50 %

Delta T

The key indicator of droplet evaporation risk. SprayCast shows the current Delta T so you know if conditions right now are ideal, marginal or unsuitable.

Ideal 2–8 °C · Australia via BOM data
More than a forecast

Log it. Calculate it. Prove it.

Knowing when to spray is half the job. Pro adds the tools for the other half — a spray job log you can fill in from the cab, the calculators you'd otherwise do on the back of an envelope, and a withholding period lookup for the products you use.

Every record captures the conditions at the time of application and the product details as registered on that date, so your history stays accurate even when labels change.

See every feature

Spray job log

Product, rate, water volume, paddock, operator and weather — logged in under a minute, straight from your phone.

AI label scan

Photograph the label and the batch number and expiry are read straight into the job. No typing, no transcription errors.

Tank mix and speed calculators

Exact product volumes per tank load, and the travel speed needed to hit your target rate from a 60-second jug test.

Herbicide database and WHP lookup

1,480 registered herbicides across four countries, with grazing withholding periods and safe-to-graze dates where the label provides them.

PDF and CSV reports

Branded spray records for clients, agronomists and auditors, exported with a tap. Available on every plan for records you've already made.

Get the app

Free to start.
$80 a yearPlus GST for the full picture.

Every new account gets 7 days of Pro. No credit card required. Open SprayCast in your browser, or download it from the app stores. Full pricing and how to subscribe are on one page.

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Know your window
before you spray.

Free for the 7-day forecast summary. $80 a yearPlus GST for the full hourly breakdown, job logging, WHP lookup and calculators.

Get SprayCast See all features