Union City Weather in September

September in Union City typically sees daytime highs of 25°C (77°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 City in September

Looking at the last 30 years, the data shows about 9 days with rain, averaging 93 mm (3.7 in) for the month. The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.

Temperature in Union City in September

If you're visiting Union City in September, expect perfect temperatures with highs of 25°C (77°F) and overnight lows of 17°C (63°F). Overall, the month follows a fairly predictable daily temperature pattern. Nights drop to around 17°C (63°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.

Sunshine in Union City in September

There are approximately 218 hours of sunshine this month, resulting in mostly clear days.

Wind Speed in Union City in September

Average wind conditions reach 5 m/s (10 knots) in September. This creates lively weather with fresh winds that make small trees sway noticeably. Remember this is an average: some days are less windy while others have particularly active windy conditions.

Average water temperature in September

At 20°C (68°F), the water is pleasant for swimming. Most people find this range ideal — cool enough to be refreshing, warm enough to stay in comfortably.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. September typically offers the best weather for Union City.

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For a detailed overview over the year and the best time to visit the United States of America, check out our Union City's climate page.

Union City Temperature in September

Min Temperature 17°C (63°F)  

Max Temperature 25°C (77°F)  

Water Temperature 20°C (68°F) *  

Chance of Rain 30%  

Precipitation 93 mm (3.7 in)  

Rainy days 9 days  

Humidity 68% *  

Windspeed 5 m/s (10 knots) *  

Sunshine 218 hours *  

Percentage Sunshine 59% *  

* Data from: New York City, the United States of America (10 KM, 6 Miles).

What to Wear in Union City in September

Warm temperatures in September make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Prepare for significant rainfall with proper waterproof clothing and shoes. Expect water temperatures of around 20°C (68°F), which is ideal for taking a refreshing dip. Bring swimwear and consider packing a towel for drying off. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.

What To Do in Union City in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

9/10

Cycling

7/10

Walking

7/10

Camping

8/10

Outdoor sports

7/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Union City's climate page.

More climate data for Union City

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

See the full Union City climate overview or explore weather in the United States of America.