What's the best time of day to water?
Quick answer
Early morning is best. It's cooler and usually calmer, so less water evaporates or blows away, and the leaves dry off during the day, which helps reduce fungal disease. Avoid watering in the heat of the day, and avoid regular evening watering that leaves the lawn wet overnight. Always water within your local water rules.
Why this happens
The best time to water is early in the morning, for two reasons.
Less water is wasted. Mornings are cooler and usually calmer, so less water evaporates before it reaches the soil and less blows away from sprinklers. Water Corporation advises watering before 9am or after 6pm, and notes that morning is best because the cooler temperature means less evaporation.
The lawn dries off. Water applied in the morning has the whole day to dry off the leaves. Water applied in the evening can leave the lawn wet all night, and long periods of leaf wetness in mild, humid weather are what fungal diseases such as brown patch need.
What about evening watering?
Sometimes evening is the only practical time, and local rules may allow it. If so, water less often and more deeply, rather than a light watering every evening. On humid summer nights, morning is still the better choice.
Midday watering
Watering in the heat of the day wastes the most water to evaporation and wind. Many water rules don’t allow sprinklers at that time anyway. Hand-watering a stressed patch or new turf is a different matter; check what your local rules allow.
Local rules come first
Water authorities set the days and hours you can use sprinklers, and these change with conditions. In Melbourne, for example, the permanent water-saving rules allow watering systems only between 6pm and 10am. Check your water authority’s current rules and set your timer within them.
It depends on your grass and climate
| If you have… | What changes |
|---|---|
| Perth and the South West | Water Corporation advises watering before 9am or after 6pm on your rostered days, with mornings best. |
| Melbourne | Under Melbourne's permanent water-saving rules, watering systems can only run between 6pm and 10am. Check your retailer's current rules. |
Rows that match the grass and climate zone you've set are highlighted. Set your climate zone
What you can do
Check your local rulesCheck first
Many areas limit sprinkler use to certain hours. Set your timer within them.
Set the timer for early morning
Finish before the day heats up and before the wind picks up.
Avoid regular evening watering
If evenings are your only option, water less often and deeply rather than every night.
What not to do
- Watering in the middle of a hot, windy day.
- Watering every evening, keeping leaves wet overnight in humid weather.
Log it
Keep a record of what you applied, when, and at what rate. Your Lawn Journal works on this device without an account, and reminds you when the next step is due.
What's next
Related grass types, weeds, pests and diseases
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Sources
- How much water does my garden need?, Water Corporation (Western Australia)Water before 9am or after 6pm; mornings best because cooler temperatures mean less evaporation. Accessed 4 October 2026.
- Water restrictions and water saving rules, Melbourne WaterMelbourne water restrictions and water-saving rules. Accessed 4 October 2026.
- Permanent water-saving rules, Greater Western WaterWatering systems only between 6pm and 10am; hand-held hoses with a trigger nozzle at any time. Accessed 4 October 2026.
- Turf weed, pest and disease identification guide (poster), Bayer Environmental Science, hosted by Turf AustraliaBrown patch and humidity. Accessed 3 October 2026.