The John Muir Trail in September usually has mild and nice weather with lots of sunny days. During the day, temperatures are often between the mid-60s and upper 70s °F, while at night, they can drop to the 40s and 50s °F, making evenings and nights cool or cold. There is not much rain, with most places getting about 0.00 to 0.02 inches per day, though there can be occasional rain showers and thunderstorms, especially in higher areas.
At the start of the trail, expect mostly sunny days with very little rain. This continues for most of the trail, but in the middle sections, there might be a slightly higher chance of rain. However, sunny weather is still common.
Towards the end of the trail, sunny weather mostly continues, but there may be a bit more rain or thunderstorms, especially at higher elevations where the temperatures are cooler and the weather is less predictable.
Overall, the weather along the John Muir Trail in September is stable with warm days and cool nights, making it a good time for hikers.
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