Weather WorldUpper Merced Pass Lake, CA Weather Forecast
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Upper Merced Pass Lake Weather Forecast
| TODAY | TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | TUESDAY | WEDNESDAY |
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| Sunny | Partly Cloudy | Partly Sunny | Partly Cloudy | Sunny | Mostly Clear | Mostly Clear | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy |
| Hi: 77°FHi: 25°C | Lo: 55°FLo: 13°C | Hi: 75°FHi: 24°C | Lo: 54°FLo: 12°C | Hi: 73°FHi: 23°C | Hi: 73°FHi: 23°C Lo: 52°FLo: 11°C | Hi: 73°FHi: 23°C Lo: 52°FLo: 11°C | Hi: 72°FHi: 22°C Lo: 51°FLo: 11°C | Hi: 72°FHi: 22°C Lo: 51°FLo: 11°C | Hi: 72°FHi: 22°C Lo: 51°FLo: 11°C | Hi: 72°FHi: 22°C Lo: 51°FLo: 11°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 310 AM PDT Thu Aug 20 2026 
Upper Merced Pass Lake Radar Loop
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Upper Merced Pass Lake Forecast Discussion
Issued: 412 AM PDT Thu Aug 20 2026
Key Messages
1. Warmup continues Thursday before trending back to seasonal averages.
2. Monsoonal moisture brings 5 to 15 percent chance of thunderstorms over the Sierra Nevada beginning Friday.
3. Slight risk of extreme heat next week.
Discussion
... Region-wide temperatures continue to trend upward. All climate sites reported average to above average temperatures today, with Fresno reaching triple digits. As for tomorrow, the National Blend of Models (NBM) shows high t...