Yosemite National Park weather

Our guide to the weather in Yosemite National Park during September

20

Average high

4

UV Index

24mm

Monthly rainfall

41%

Humidity

We've looked at the most up-to-date weather data for Yosemite National Park, covering the last 12 years up to 2024, plus we've asked our team of travel bloggers for their first-hand experiences in order to answer the most frequently asked questions about Yosemite National Park weather in September.

How warm is it in Yosemite National Park during September?

The temperature reaches around 20℃ during the daytime in September, falling away to 6℃ at night. The UV index will be moderate at this time of year, so not something to worry about for the average person. However, if you're going to be outside for long periods it's worth wearing a broad spectrum SPF 30+ sunscreen and UV-blocking sunglasses. Remember that bright surfaces, such as water and sand increase UV exposure.

Does it snow in Yosemite National Park during September?

Possibly. There's a chance of snow during September but not as much as you might think. Check the local forecast before you leave home so that you can pack appropriate footwear and clothing.

Does it rain in Yosemite National Park during September?

On average, in September you'll see rain on just one day in the month. In other words, you shouldn't see any of the wet stuff. There's a small chance that you'll catch a thunderstorm during your trip.

Is it windy in Yosemite National Park during September?

You're unlikely to experience any strong winds. Expect a light breeze that picks up slightly at times in September. With moderate humidity and mild air temperatures, the breeze will have a slight cooling effect.

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Weather in Yosemite National Park

Our month-by-month guide to the weather and climate in Yosemite National Park

3.1

Yosemite National Park weather in

January
2.3

Yosemite National Park weather in

February
3.5

Yosemite National Park weather in

March
7.5

Yosemite National Park weather in

April
12.0

Yosemite National Park weather in

May
19.3

Yosemite National Park weather in

June
23.9

Yosemite National Park weather in

July
23.3

Yosemite National Park weather in

August
20.4

Yosemite National Park weather in

September
14.1

Yosemite National Park weather in

October
7.4

Yosemite National Park weather in

November
2.1

Yosemite National Park weather in

December