Palo Alto weather in September 2025

The temperatures in Palo Alto in September are comfortable with low of 17°C and and high up to 27°C.

As it is almost never rain during September in Palo Alto the weather is perfect for hanging out outside and exploring all that Palo Alto has to offer.

Our weather forecast can give you a great sense of what weather to expect in Palo Alto in September 2025.

If you’re planning to visit Palo Alto in the near future, we highly recommend that you review the 14 day weather forecast for Palo Alto before you arrive.

Temperatures

27° / 17°

Rainy Days

Snowy Days

Dry Days

Rainfall

Sun Hours

11.2

Hrs

Sun	Mon	Tue	Wed	Thu	Fri	Sat
	1 26° /15°	2 26° /14°	3 29° /15°	4 30° /16°	5 31° /17°	6 32° /18°
7 29° /16°	8 31° /16°	9 28° /15°	10 26° /13°	11 25° /15°	12 25° /14°	13 26° /14°
14 25° /14°	15 23° /14°	16 22° /14°	17 19° /13°	18 20° /13°	19 22° /13°	20 23° /13°
21 24° /13°	22 25° /13°	23 28° /14°	24 29° /16°	25 27° /15°	26 25° /15°	27 28° /14°
28 24° /13°	29 25° /13°	30 27° /14°

Explore the weather in Palo Alto in other months

Palo Alto annual weather

Month	Temperatures	Rainy Days	Dry Days	Rainfall	Weather	More details
January	16° / 9°	4	27	85 mm	Good	Palo Alto in January
February	17° / 9°	4	24	86 mm	Good	Palo Alto in February
March	17° / 9°	5	26	88 mm	Good	Palo Alto in March
April	19° / 10°	2	28	35 mm	Good	Palo Alto in April
May	21° / 12°	1	30	15 mm	Good	Palo Alto in May
June	25° / 15°	0	30	5 mm	Perfect	Palo Alto in June
July	27° / 16°	0	31	1 mm	Perfect	Palo Alto in July
August	27° / 17°	0	31	1 mm	Perfect	Palo Alto in August
September	27° / 17°	0	30	4 mm	Perfect	Palo Alto in September
October	24° / 15°	1	30	28 mm	Perfect	Palo Alto in October
November	19° / 12°	3	28	44 mm	Good	Palo Alto in November
December	15° / 9°	5	26	71 mm	Good	Palo Alto in December

Temperatures in Palo Alto in September

Rain in Palo Alto in September

Weather in Palo Alto in September - FAQ

What is the average temperature in Palo Alto in September?

The average temperature in Palo Alto in September is 17/27° C.

What is the chance of rain in Palo Alto in September?

On average, there are 0 rainy days in Palo Alto during September.

Weather wise, is September a good time to visit Palo Alto?

The weather in Palo Alto in September is perfect.

Can it snow in Palo Alto in September?

On average, there are 0 snowy days in Palo Alto in September.

More about the weather in Palo Alto