Temperatures in Northland will remain quite cool for the rest of this week despite showers clearing away.

MetService meteorologist Tom Adams said 40 lightning strikes were recorded on land and a lot more offshore in the region in the 12 hours to 9.30am Wednesday due to an unstable weather situation. Most of the strikes were between 3am and 6am.

Adams said although 40 may not seem a huge number, it was a "reasonable" amount of lightning strikes fairly spread over Northland for that duration.

The weather, he said, was as a result of a lot of fronts and southwest winds over
Northland but skies should clear on Saturday when a high pressure system moved in.

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Showers should also ease off over the weekend, he said.

Fine weather is expected for the first half of next week for most of Northland, though the temperature is expected to drop.

Highs of 17C are expected until Monday with overnight lows of up to 11C. However, from Monday highs will be up to 15C, but overnight the lows will fall to 7C or below.

There were almost 3500 lightning strikes around the country on Wednesday, with most in the South Island on the West Coast.