Is El Niño Returning? What Waikato Property Owners Should Know Before Summer
- Water Tank Solutions
- Jul 23
- 4 min read
Current climate forecasts suggest El Niño conditions are developing across the Pacific. While every season is different, history shows that El Niño can significantly influence New Zealand's weather—particularly during spring and summer. For lifestyle block owners, farmers, horticultural businesses and homeowners relying on stored water, now is the ideal time to prepare.
What is El Niño?
El Niño is part of the natural El Niño Southern Oscillation (ENSO), a recurring climate pattern caused by changes in Pacific Ocean temperatures and atmospheric circulation.
When El Niño develops, New Zealand typically experiences:
More frequent westerly and south-westerly winds
Greater temperature swings
Drier conditions across many northern and eastern regions
Increased evaporation during warmer periods
No two El Niño events are identical, but they have historically increased the likelihood of
prolonged dry spells across many parts of New Zealand.
What Does This Mean for Waikato?
Unlike eastern regions such as Hawke's Bay or Canterbury, Waikato sits in a transition zone.
That means an El Niño summer doesn't necessarily mean months without rain—but it can produce:
Longer periods between meaningful rainfall
Faster drying of pasture and soils
Higher water demand from gardens and livestock
Increased pressure on household rainwater supplies
Greater reliance on irrigation during peak growing months
For properties dependent on roof-collected rainwater, several weeks of hot, windy weather can reduce tank levels surprisingly quickly.
Even if total seasonal rainfall ends up close to average, rainfall often becomes less frequent and less reliable during El Niño years.
Looking Back at Previous El Niño Years
New Zealand has experienced several significant El Niño events over recent decades.
Some of the strongest occurred during:
1982–83
1997–98
2015–16
Each produced different local outcomes, but common themes included:
increased drought risk
reduced soil moisture
stronger westerly winds
increased pressure on rural water supplies
Historical records show that these events often lead to elevated fire danger and increased irrigation demand in affected regions.
Why Water Security Matters
Many rural properties don't think about water until they start running short.
Unfortunately, by that stage demand for:
water tanks
pumps
irrigation equipment
water cartage
often increases dramatically.
Waiting until January can mean:
longer installation lead times
limited product availability
emergency water deliveries
stressed gardens and livestock
Planning before summer is usually simpler—and often less expensive.
Is Your Property Ready?
Now is a good opportunity to assess your current water system.
Ask yourself:
✓ Is my existing water storage sufficient for an extended dry spell?
✓ Am I relying on a single tank?
✓ Is my pump performing efficiently?
✓ Is my filter system sufficent for my property and working as it should?
✓ Is my irrigation system applying water evenly and efficiently?
✓ Are there leaks wasting valuable water?
Small improvements made before summer can make a significant difference if conditions become drier than normal.
Irrigation Isn't About Using More Water
One of the biggest misconceptions is that irrigation increases water consumption.
A properly designed irrigation system actually aims to use less water by delivering it exactly where and when plants need it.
Modern irrigation systems can:
reduce evaporation losses
minimise runoff
improve plant health
automate watering schedules
make better use of stored rainwater
For lifestyle blocks, gardens, equestrian facilities and commercial landscapes, efficient irrigation is one of the best investments in long-term water resilience.
Don't Forget Water Storage
Increasing storage capacity is often one of the most cost-effective ways to improve water security.
Adding another tank can:
capture more winter rainfall
reduce reliance on water deliveries
provide additional firefighting reserve
improve household water reliability
support irrigation during dry periods
Many property owners only discover their storage is undersized after experiencing their first prolonged dry summer.
The 2026 Outlook
Earth Sciences New Zealand (formerly NIWA) has advised that El Niño conditions have now developed and are expected to strengthen through winter, with the most significant impacts likely during spring and summer. Forecasts indicate a tendency towards stronger westerly weather patterns and an increased likelihood of drier conditions in parts of the North Island as the season progresses. While no seasonal outlook guarantees exactly what any one location will experience, the current guidance points to an elevated risk of prolonged dry periods later this year.
For Waikato property owners, the message is simple:
Preparation is far easier than reacting once water becomes scarce.
How WTS Can Help
WTS can help assess your property's water system.
We can assist with:
Preparing before summer gives you the best opportunity to maximise every litre of water when it matters most.
Get in touch to talk about your water requirements
Prepare Before the Dry Weather Arrives
Whether you need additional water storage, an efficient irrigation system, or advice on improving your property's water security, the team at WTS can help you prepare with practical, reliable solutions tailored to your needs.
Talk to WTS today about protecting your home, lifestyle block or business before summer arrives.
FAQs
Will El Niño cause a drought in Waikato?
Not necessarily. Every El Niño event is different, but they often increase the likelihood of longer dry spells, higher evaporation and greater pressure on water supplies throughout parts of the North Island, including Waikato.
How does El Niño affect rainwater tanks?
Longer periods between rainfall can cause rainwater tank levels to drop more quickly, especially during hot and windy weather when household and irrigation demand is higher.
Is now a good time to install irrigation?
Yes. Planning before summer allows irrigation systems to be designed and installed before seasonal demand increases. It also gives plants the best opportunity to establish before dry conditions develop.
How much water storage do I need?
The ideal storage capacity depends on your property's roof area, household water use, livestock requirements and irrigation demand. WTS can as
sess your property and recommend the most suitable solution.
Can irrigation actually save water?
Yes. A professionally designed irrigation system applies water more accurately and efficiently, reducing evaporation, runoff and waste compared with manual watering.
You can book a Service with WTS online:
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