San Carlos Weather in September

September in San Carlos brings high temperatures, with daytime highs of 26°C (79°F) and nights around 13°C (55°F). Only 3.3 mm (0.1 in) of rainfall is typical, making it a largely dry month.

Rainfall in San Carlos in September

Typically, about a single day will experience rainfall, with an average of 3.3 mm (0.1 in) for the month. Any rain that does arrive is likely to be light drizzle rather than a proper shower.

Temperature in San Carlos in September

If you're visiting San Carlos in September, expect perfect temperatures with highs of 26°C (79°F) and overnight lows of 13°C (55°F). September is part of summer. Conditions stay fairly consistent through the month, making it easier to plan what to wear. With lows of 13°C (55°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. It's the warmest month of the year on average, so summer clothing is the way to go.

Sunshine in San Carlos in September

The days are predominantly sunny, with an estimated total of around 270 hours of sunshine. These sun-filled days are perfect for playing sports, visiting parks, or going for a bike ride.

Wind Speed in San Carlos in September

Wind speeds average 5 m/s (10 knots) during September. At this speed, gentle to moderate breezes make small trees sway and the wind creates whitecaps on water bodies. Daily variations range from moderate winds to stronger breezes, creating excellent conditions for sailing, kite flying and wind sports.

Average water temperature in September

With water at 14°C (57°F), it's on the cooler side. Keen swimmers won't be put off, but those who prefer warm water may find it less enjoyable.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. May, June, July, August, September and October typically offer the best weather for San Carlos.

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• 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 Carlos's climate page.

San Carlos Temperature in September

Min Temperature 13°C (55°F)  

Max Temperature 26°C (79°F)  

Water Temperature 14°C (57°F) *  

Chance of Rain 3%  

Precipitation 3.3 mm (0.1 in)  

Rainy days a single day  

Humidity 73% *  

Windspeed 5 m/s (10 knots) *  

Sunshine 270 hours *  

Percentage Sunshine 73% *  

* Data from: San Francisco, the United States of America (16 KM, 10 Miles).

What to Wear in San Carlos in September

Warm but pleasant conditions in San Carlos 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. Dry conditions mean you won't need to worry about rain protection. With water temperatures around 14°C (57°F), the water is quite cold for swimming. You can skip the swimwear unless you're particularly tough. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.

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

More climate data for San Carlos

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

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