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City of Allentown, PAAllentown, PA Weather Forecast
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Allentown Weather Forecast
| TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY |
 |  | | | | | |  |  | | | |
| Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Mostly Sunny | Partly Cloudy | Sunny | Clearing | Sunny |
| Lo: 69°FLo: 21°C | Hi: 89°FHi: 32°C | Lo: 69°FLo: 21°C | Hi: 81°FHi: 27°C | Lo: 69°FLo: 21°C | Hi: 85°FHi: 29°C | Lo: 69°FLo: 21°C | Hi: 81°FHi: 27°C | Lo: 61°FLo: 16°C | Hi: 79°FHi: 26°C | Lo: 59°FLo: 15°C | Hi: 75°FHi: 24°C |
| POP: 50% | POP: 50% | POP: 60% | POP: 70% | POP: 70% | POP: 50% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 400 PM EDT Mon Aug 31 2026 
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Instant definitions for any meteorological term.
Instant definitions for any meteorological term.
Issued: 145 PM EDT Mon Aug 31 2026
Key Messages
1. Isolated showers and thunderstorms possible through the day and into tonight, but the risk of hazardous weather is low.
2. Heat and humidity will build into the middle of the week, along with daily chances for showers and thunderstorms. There is an increasing threat of severe thunderstorms and potentially flash flooding during the middle of the week, namely Tuesday through Thursday.
Discussion
... KEY MESSAGE 1...Isolated showers and thunderstorms possible through the day and into to...