Foster City Weather in October

October in Foster City brings high temperatures, with daytime highs of 22°C (72°F) and nights around 12°C (54°F). The excellent weather makes it a solid choice for a visit.

Rainfall in Foster City in October

Looking at the last 30 years, the data shows about 4 days with rain, averaging 21 mm (0.8 in) for the month. The occasional light shower is possible, but rain is rarely an issue this month.

Temperature in Foster City in October

Weather in Foster City is at its excellent in October. Highs reach 22°C (72°F), while nights settle around 12°C (54°F). Overall, the month follows a fairly predictable daily temperature pattern. Nights cool down to 12°C (54°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 Foster City in October

The city usually sees around 243 hours of sunlight, indicating many sunny days — a great month for sightseeing.

Wind Speed in Foster City in October

Wind speeds average 4 m/s (8 knots) during October. At this speed, expect moderate winds that can raise dust and move small branches. Since this is an average, some days have gentle light winds while others experience stronger breezes that are quite noticeable.

Average water temperature in October

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.

If your ideal day consists of dry skies and pleasant temperatures, May, June, July, August, September and October typically offer the best circumstances for Foster 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 Foster City's climate page.

Foster City Temperature in October

Min Temperature 12°C (54°F)  

Max Temperature 22°C (72°F)  

Water Temperature 14°C (57°F) *  

Chance of Rain 13%  

Precipitation 21 mm (0.8 in)  

Rainy days 4 days  

Humidity 71% *  

Windspeed 4 m/s (8 knots) *  

Sunshine 243 hours *  

Percentage Sunshine 71% *  

* Data from: San Francisco, the United States of America (11 KM, 7 Miles).

What to Wear in Foster City in October

For Foster City in October, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Some rain is possible, so pack something to handle light showers. 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. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.

What To Do in Foster City in October

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

Cycling

10/10

Walking

10/10

Barbeque

9/10

Camping

10/10

Outdoor sports

10/10

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 Foster City's climate page.

More climate data for Foster City

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

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