National Forecast

Issued at: 22 September 2025 15:20

TODAY - Monday 22nd September

Variable cloud and sunshine, with the best of the sunshine over the southern half of the country. Highest temperatures of 12 to 15 degrees in light northerly or variable breezes.

TONIGHT

Dry and chilly tonight with long clear spells. A few patches of mist and fog will form overnight. Lowest temperatures of 1 to 6 degrees, but a little lower in rural parts with a chance of grass frost.

TOMORROW - Tuesday 23rd September

Tomorrow will be a mainly dry day with a mix of cloud and sunny spells once early mist and fog patches clear. Highest temperatures of 12 to 15 degrees with a light variable breezes becoming south to southeasterly and increasing moderate along Atlantic coasts.

National Outlook

Overview: High pressure dominates for a time bringing settled weather. Cool at first but temperatures will recover a little during the week. Wet and windy weather is possible later in the week and into next weekend.

Tuesday night: Largely dry with clear spells at first, though cloud will thicken from the west overnight. Lowest temperatures of 4 to 9 degrees, mildest under cloudier skies in the west, with mostly light south to southeasterly breezes.

Wednesday: A mix of cloud and hazy sunny spells with just isolated patches of light rain or drizzle possible along western coastal fringes. Highest temperatures of 13 to 16 degrees in light to moderate southerly breezes, fresher near the west coast.

Thursday: Variable cloud and hazy sunshine. Most areas dry but some patchy light rain and drizzle is possible, mainly in Atlantic coastal areas or near to the south and east coast. Highest temperatures of 14 to 16 degrees with light to moderate south to southeasterly breezes.

Further outlook: Some uncertainty but wet and windy weather may move in from the Atlantic.