Weather in Santa Clara County

Calculated from weather data of Norman Y Mineta San Jose International Airport (KSJC) between 2020 and 2024.

Maximum temperatures (°C)

Month	Average	2024	2023	2022	2021	2020
January	16.0	17.0	15.5	17.1	16.5	15.0
February	17.3	17.6	15.3	19.6	18.1	19.3
March	18.3	18.5	15.4	20.6	18.3	17.3
April	21.1		20.1	21.6	20.8	21.0
May	23.1		21.3	24.6	23.3	25.5
June	26.3		23.1	27.8	25.1	28.0
July	27.2		27.6	26.1	26.1	27.1
August	28.3		29.6	28.3	27.3	29.3
September	27.7		26.1	29.1	27.6	28.6
October	25.2		26.8	23.5	23.6	27.6
November	19.9		22.0	17.8	20.3	19.1
December	15.9		17.8	13.5	14.0	16.6
Average	21.7	17.7	21.7	22.7	21.7	22.9

Average highest temperature per day

The maximum temperature is typically observed some hours after noon.

Minimum temperatures (°C)

Month	Average	2024	2023	2022	2021	2020
January	7.3	9	8	6	7	7
February	6.6	9	5	5	7	5
March	8.3	10	7	8	7	9
April	9.9		9	10	8	10
May	12.1		12	11	11	13
June	14.3		13	15	14	15
July	15.0		15	15	15	15
August	16.3		17	16	15	17
September	15.3		15	17	14	16
October	12.6		14	13	12	14
November	8.6		10	7	10	7
December	6.9		9	6	7	6
Average	10.8	9.0	11.1	10.8	10.6	11.0

Average lowest temperature per day

The minimum temperature is typically observed just before sunrise.

Cold and hot days

Number of days	2024	2023	2022	2021	2020
30 °C or warmer	0	32	33	19	42
25 °C or warmer	0	110	121	100	140
20 °C or warmer	17	205	227	220	224
0 °C or colder	0	0	0	0	1

Precipitation (%)

Month	Average	2024	2023	2022	2021	2020
January	9.3	9	15	0	7	4
February	7.6	18	9	0	4	0
March	8.5	8	17	3	4	9
April	2.4		1	3	0	5
May	1.3		1	0	0	1
June	0.3		0	0	0	1
July	0.0		0	0	0	0
August	0.2		2	0	0	0
September	0.3		0	1	0	0
October	0.7		2	0	4	0
November	3.3		1	4	1	1
December	8.0		9	21	12	3
Average	4.1	11.2	4.3	2.0	2.3	2.0

Precipitation during daylight period

Percentage of observations with observed rain, drizzle, snow or hail. Only observations between sunrise and sunset are taken into account.

Wind speed (km/h)

Month	Average	2024	2023	2022	2021	2020
January	10.4	11	14	6	11	9
February	12.3	13	12	9	12	11
March	12.8	13	15	12	13	11
April	12.9		13	15	13	11
May	13.6		13	16	13	13
June	13.4		13	14	13	15
July	12.2		11	13	12	13
August	11.8		12	12	12	11
September	11.4		11	12	11	10
October	10.2		10	9	12	9
November	9.0		9	8	9	10
December	9.6		9	8	11	9
Average	11.8	12.1	11.8	11.6	11.9	11.2

Average wind speed

Excluding wind gusts. Only observations between sunrise and sunset are taken into account.

Prevailing wind direction

Month	2024	2023	2022	2021	2020
January	S	S	NW	NW	NW
February	S	NW	NW	NW	NW
March	W	S	NW	NW	W
April		NW	NW	NW	NW
May		W	NW	NW	NW
June		NW	NW	NW	NW
July		NW	NW	NW	NW
August		NW	NW	NW	NW
September		NW	NW	NW	NW
October		NW	NW	NW	NW
November		NW	NW	NW	NW
December		SE	S	S	NW

Prevailing wind direction

Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.

Santa Clara County weather Q&A

What is the warmest month in Santa Clara County?

The warmest month is August with an average temperature of 28 °C over the past years.

What is the coldest month in Santa Clara County?

The coldest month is December with an average daytime temperature of 16 °C in the past few years.

Which month is the wettest in Santa Clara County?

Chance of precipitation is the highest in January with a probability of around 9.4 %.

Which month is the driest in Santa Clara County?

The least rainfall and snow can be expected in July. The probability is about 0.0 %.