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Cardiff Weather Forecast
| TODAY | TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT |
 |  | | | |  | | | |  |  |  |
| Sunny | Mostly Clear | Sunny | Mostly Clear | Sunny | Partly Cloudy | Mostly Sunny | Partly Cloudy | Mostly Sunny | Mostly Cloudy | Chance of Showers | Chance of Showers |
| Hi: 75°FHi: 24°C | Lo: 55°FLo: 13°C | Hi: 79°FHi: 26°C | Lo: 61°FLo: 16°C | Hi: 81°FHi: 27°C | Lo: 65°FLo: 18°C | Hi: 81°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 75°FHi: 24°C | Lo: 65°FLo: 18°C | Hi: 81°FHi: 27°C | Lo: 65°FLo: 18°C |
| POP: 40% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 400 AM EDT Tue Sep 15 2026 
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Issued: 430 AM EDT Tue Sep 15 2026
Key Messages
1. Mainly quiet this week with high pressure in control.
2. Somewhat unsettled weather will be possible at times late this week and next weekend as multiple systems move through. However at this point significant impacts due not appear likely.
Discussion
... KEY MESSAGE 1...Mainly quiet this week with high pressure in control.
An expansive area of high pressure will remain in control through Thursday resulting in a stretch of nice mid-September days.
A sunny day is on tap for today with l...