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
September in Union typically sees daytime highs of 29°C (84°F) and nighttime lows of 17°C (63°F). Rainfall is also possible this month, so it's worth packing an umbrella.
Rainfall in Union in September
Expect around 9 days of rain based on historical data, with 84 mm (3.3 in) average. The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.
Temperature in Union in September
September is a excellent month in Union, with 29°C (84°F) during the day and 17°C (63°F) at night. This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. With overnight lows of 17°C (63°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.If you favor pleasant temperatures and minimal rainfall, September is one of the best months to visit Union.
Union Temperature in September
Min Temperature
17°C (63°F)
Max Temperature
29°C (84°F)
Chance of Rain
30%
Precipitation
84 mm (3.3 in)
Rainy days
9 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
Warm but pleasant conditions in Union in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Expect heavy rainfall, so bring good rain protection and waterproof bags.
What To Do in Union in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
-
Cycling7/10 -
Walking7/10 -
Camping8/10 -
Outdoor sports7/10
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
The 10 most alternative cities in the United States
Discover the top 10 fun and alternative U.S. cities rich in art, culture, and adventure. From Portland's hippy charm to Sedona's stunning landscapes.
Sedona: Explore Majestic Red Rock Landscapes
A picturesque artists' town surrounded by red rocks and known for its spirituality, vortex energy, and stunning hikes like Cathedral Rock.
10 most idyllic villages to visit in the United States
Discover 10 idyllic villages in the USA, from California to Vermont. Explore their unique charm, rich history, stunning nature, and vibrant arts scenes.