San Ysidro Weather in September

September in San Ysidro sees daytime temperatures around 27°C (81°F) and lows of 17°C (63°F) at night. The perfect weather makes it a good time to visit.

Rainfall in San Ysidro in September

Based on our climate data of the past 30 years, about a single day of rain are anticipated, with 4.1 mm (0.2 in) on average. If rain does fall, it tends to be a moderate shower rather than anything heavy.

Temperature in San Ysidro in September

September tends to be one of the perfect months in San Ysidro, with 27°C (81°F) in the afternoon and 17°C (63°F) overnight. This kind of day-to-night contrast is typical for this time of year. 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. On average, it is the warmest month of the year.

Sunshine in San Ysidro in September

There are approximately 272 hours of sunshine this month, resulting in mostly clear days.

If you're a fan of comfortable temperatures and drier conditions, September is a great time to visit.

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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 San Ysidro's climate page.

San Ysidro Temperature in September

Min Temperature 17°C (63°F)  

Max Temperature 27°C (81°F)  

Chance of Rain 3%  

Precipitation 4.1 mm (0.2 in)  

Rainy days a single day  

Humidity 79% *  

Sunshine 272 hours *  

Percentage Sunshine 73% *  

* Data from: Tijuana, Mexico (2 KM, 1 Miles).

What to Wear in San Ysidro 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. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.

What To Do in San Ysidro 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 San Ysidro's climate page.

More climate data for San Ysidro

Temperature Rainfall Sunshine Humidity

See the full San Ysidro climate overview or explore weather in the United States of America.