Yosemite National Park is definitely worth a visit
Vast forests, blue lakes, towering sequoias, and majestic waterfalls hint at the beauty of Yosemite National Park—a true natural masterpiece.
Union Weather in September
In Union, September brings high daytime temperatures around 23°C (73°F), with nights cooling to 10°C (50°F). Expect quite a bit of rainfall this month.
Rainfall in Union in September
The climate data from previous years indicates about 11 days of rain, averaging 92 mm (3.6 in) for the month. When showers do arrive, they tend to be on the heavier side. Worth being prepared even if rain days are not that numerous.
Temperature in Union in September
Union has excellent weather in September, with days reaching 23°C (73°F) and nights cooling to 10°C (50°F). Overall, the month follows a fairly predictable daily temperature pattern. With lows of 10°C (50°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.If you're a fan of comfortable temperatures and drier conditions, September is a great time to visit.
Union Temperature in September
Min Temperature
10°C (50°F)
Max Temperature
23°C (73°F)
Chance of Rain
37%
Precipitation
92 mm (3.6 in)
Rainy days
11 days
Union Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Union - and find the best time to visit.
Best Places in the United States of America in September
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Union in September
For Union in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho.
What To Do in Union in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling9/10 -
Walking9/10 -
Camping8/10 -
Outdoor sports9/10
Union 3-Day Forecast
More climate data for Union
See the full Union climate overview or explore weather in the United States of America.
Popular in September
Where to go in September - average daytime high across popular destinations.
Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
Yosemite National Park is definitely worth a visit
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