Redwood City Weather in September

Thinking of visiting Redwood City in September? Expect high temperatures reaching 26°C (79°F) during the day, dropping to 13°C (55°F) at night, with minimal rainfall.

Rainfall in Redwood City in September

Typically around a single day of rainfall are expected, averaging 3.2 mm (0.1 in) for the month. If rain does fall, it tends to be very light and barely worth getting out an umbrella for.

Temperature in Redwood City in September

The temperature in Redwood City in September is perfect. Daytime highs reach 26°C (79°F), with nights dropping to 13°C (55°F). During September, you'll experience the summer season. This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. Nights cool down to 13°C (55°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.

Sunshine in Redwood City 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 Redwood City in September

September has wind speeds averaging 5 m/s (10 knots). You can expect gentle to moderate winds that move small trees and make flags wave steadily on typical days. Conditions typically range from light breezes to moderate winds.

Average water temperature in September

The water is 14°C (57°F) this month — cool enough to feel refreshing on a warm day, but cold enough that most people won't stay in for long without a wetsuit.

If you're inclined towards comfortable temperatures and drier conditions, September is a good time to visit Redwood City.

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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 Redwood City's climate page.

Redwood City 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 3.2 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 (19 KM, 12 Miles).

What to Wear in Redwood 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. The water temperature sits at about 14°C (57°F), which is too chilly for most people to enjoy swimming. Leave the swimsuit at home unless you love cold water. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.

What To Do in Redwood 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 Redwood City's climate page.

More climate data for Redwood City

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

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