Warmer temperatures are set to hit the country, but the weather is also going to get wetter.

While election day has been fine for most, the next few days are expected to bring wet, windy weather along with high temperatures.

The heat and rain are expected to hit the South Island tomorrow and move north on Monday.

"It actually starts tomorrow, just bringing warmer air from the north but as it comes over from Australia it picks up moisture from the Tasman," MetService meteorologist April Clark said.

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MetService has issued a heavy rain warning for the West Coast of the South Island and a strong wind warning for Canterbury.

"You can still have hot weather and rain although it can seem like an oxymoron. It's quite normal for the weather to be quite unsettled in spring," Clark said.

High temperatures on Monday will get into the mid-twenties in some places. Photo / Twitter
High temperatures on Monday will get into the mid-twenties in some places. Photo / Twitter

The severe weather warnings take effect from Sunday evening, with rough weather expected to dissipate on Monday.

Watches were also issued for heavy rain in the Otago headwaters and strong wind forecast for Fiordland, Southland, Stewart Island and Otago from tomorrow afternoon.

Strong wind watches were also issued for Marlborough, Wellington and Wairarapa from the early hours of Monday morning.

The watches could be upgraded to a warning tomorrow.

The rain and gales were expected to be accompanied by high temperatures, with a high of 21 expected in Christchurch tomorrow, and 23 on Monday.

As a heatwave moves over from across the Tasman, it would pick up moisture from the Tasman Sea, Clark said.

This would result in temperatures much lower than Australia has been experiencing, but much warmer than last week.

The highest temperatures were expected to be 24 in Blenheim tomorrow, and 25 in Napier and Hastings on Monday.

Auckland would reach 20 degrees on Monday, but Wellington would largely miss out on the heat, reaching 16 on Sunday and 15 on Monday.

Clark said the high temperatures would be fairly short-lived, not lasting the required five days to be considered a heatwave.

Forecasts

Auckland:

Sunday - high 18, low 12, morning cloud clearing to fine.

Monday - high 20, low 14, low cloud breaking to mainly fine. Occasional rain at night.

Tuesday - high 18, low 11, rain developing, northwesterlies strong for a time.

Whangarei:
Sunday - high 20, low 10. Mostly sunny, some morning and evening cloud. Westerlies.
Monday - high 22, low 14. Sunny spells, cloud increasing in the evening. Northwesterlies.
Tuesday - high 20, low 11. Rain developing. Northwesterlies, strong for a time.

Hamilton:
Sunday - high 18, low 11. Low cloud at times with occasional drizzle. Westerlies.
Monday - high 20, low 13. A few showers, then evening rain. Northwesterlies.
Tuesday - high 18, low 9. Rain easing to a few showers late. Northwesterlies dying out.

Tauranga:
Sunday - high 19, low 12. Partly cloudy. Westerlies.
Monday - high 21, low 14. Sunny spells, occasional rain at night. Northwesterlies.
Tuesday - high 18, low 11. Rain developing. Northwesterlies, strong for a time.

Wellington:
Sunday - high 16, low 13. A fine morning, with cloud and occasional drizzle developing, northerlies strengthening.
Monday - high 15, low 13. Rain developing in the morning, strong northerlies, gales gusting to 100km/h in exposed places.
Tuesday - high 16, low 10. Rain easing, then clearing late. Northerly gales easing.

Christchurch:
Sunday - high 21, low 11. Fine and warm, with high cloud from evening. Northwesterlies strengthening.
Monday - high 23, low 8. High cloud, northwesterlies, strong for a time in the afternoon.
Tuesday - high 18, low 8. Mainly fine. Northerlies dying out, southwesterlies developing late.