National City Weather in September

With daytime temperatures of 27°C (81°F) and nighttime lows of 18°C (64°F), September in National City brings high temperatures during the day. The excellent weather makes it an appealing time to visit.

Rainfall in National City in September

Typically, you can expect about a single day of rain this month, with 3.1 mm (0.1 in) on average. Any rain that does arrive is likely to be light drizzle rather than a proper shower.

Temperature in National City in September

National City has excellent weather in September, with days reaching 27°C (81°F) and nights cooling to 18°C (64°F). The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. At 18°C (64°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping. On average, this month sees the highest temperatures of the year. Worth packing a few lighter outfits.

Sunshine in National City in September

Enjoy a sunny month with about 253 hours of sunshine, the clear skies make National City even more beautiful.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. January, February, March, April, May, June, July, August, September, October and November typically offer the best weather for National City.

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 National City's climate page.

National City Temperature in September

Min Temperature 18°C (64°F)  

Max Temperature 27°C (81°F)  

Chance of Rain 3%  

Precipitation 3.1 mm (0.1 in)  

Rainy days a single day  

Humidity 74% *  

Sunshine 253 hours *  

Percentage Sunshine 68% *  

* Data from: San Diego, the United States of America (6 KM, 4 Miles).

What to Wear in National City in September

Warm weather calls for comfortable, breathable clothing in September. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). Almost no rain is expected, so no need to bring rain gear. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.

What To Do in National City in September

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

Swimming

10/10

Cycling

8/10

Walking

8/10

Barbeque

10/10

Camping

10/10

Outdoor sports

8/10

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 National City's climate page.

More climate data for National City

Temperature Rainfall Sunshine Humidity

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