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Perth Weather Forecast
| TODAY | TONIGHT | SUNDAY | SUNDAY NIGHT | LABOR DAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT |
 |  |  | | | |  |  |  |  | | |
| Chance of T-Storm | Partly Cloudy | Mostly Sunny | Clearing | Sunny | Partly Cloudy | Partly Cloudy | Mostly Cloudy | Chance of Showers | Showers | Chance of Showers | Partly Cloudy |
| Hi: 75°FHi: 24°C | Lo: 51°FLo: 11°C | Hi: 71°FHi: 22°C | Lo: 49°FLo: 9°C | Hi: 75°FHi: 24°C | Hi: 75°FHi: 24°C Lo: 50°FLo: 10°C | Hi: 75°FHi: 24°C Lo: 50°FLo: 10°C | Lo: 55°FLo: 13°C | Hi: 79°FHi: 26°C | Lo: 61°FLo: 16°C | Hi: 71°FHi: 22°C | Hi: 69°FHi: 21°C Lo: 50°FLo: 10°C |
| POP: 40% | POP: 50% | POP: 70% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 830 AM EDT Sat Sep 05 2026 
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Issued: 612 AM EDT Sat Sep 5 2026
Key Messages
1) Although a few spotty showers can`t be ruled out today, impactful weather is not expected through the holiday weekend.
2) The next threat for widespread showers and possible thunderstorms will be on Wednesday into Thursday.
Discussion
... KEY MESSAGE 1...
An upper level low is located over Nova Scotia and it is expected to slowly sit and spin over Atlantic Canada through much of the holiday weekend. As a result, an upper level trough will be in place over the Northeast for the next fe...