Weather in San Diego County

Calculated from weather data of Montgomery-Gibbs Executive Airport (KMYF) between 2021 and 2025.

Maximum temperatures (°F)

Month	Average	2025	2024	2023	2022	2021
January	67.0	66.0	70.0	62.0	69.0	68.0
February	67.0	68.0	67.0	63.0	72.0	67.0
March	67.0		65.0	62.0	71.0	66.0
April	71.0		68.0	67.0	73.0	71.0
May	70.0		67.0	66.0	71.0	70.0
June	74.0		74.0	70.0	78.0	75.0
July	80.0		80.0	81.0	78.0	79.0
August	82.0		82.0	81.0	83.0	81.0
September	81.0		80.0	78.0	84.0	80.0
October	79.0		77.0	78.0	74.0	76.0
November	74.0		71.0	75.0	69.0	76.0
December	68.0		68.0	69.0	62.0	63.0
Average	73.0	67.0	72.0	71.0	74.0	73.0

Average highest temperature per day

The maximum temperature is typically observed some hours after noon.

Minimum temperatures (°F)

Month	Average	2025	2024	2023	2022	2021
January	48.0	45	48	47	48	47
February	47.0	49	45	44	47	47
March	50.0		50	48	52	48
April	54.0		53	51	56	54
May	57.0		57	56	57	58
June	61.0		61	59	58	62
July	66.0		65	64	66	66
August	67.0		66	66	68	66
September	66.0		65	65	68	65
October	60.0		58	59	61	57
November	53.0		49	52	48	55
December	48.0		48	49	45	49
Average	55.0	47.0	55.0	55.0	57.0	56.0

Average lowest temperature per day

The minimum temperature is typically observed just before sunrise.

Cold and hot days

Number of days	2025	2024	2023	2022	2021
86 °F or warmer	0	20	16	28	29
77 °F or warmer	2	100	93	117	111
68 °F or warmer	28	225	203	260	238
32 °F or colder	0	0	0	0	0

Precipitation (%)

Month	Average	2025	2024	2023	2022	2021
January	5.4	2	7	16	2	3
February	6.3	6	13	7	3	0
March	6.2		9	11	4	5
April	1.7		2	0	1	2
May	1.8		1	2	0	1
June	0.4		0	1	0	1
July	0.1		0	1	0	0
August	0.5		0	4	0	0
September	1.1		0	3	4	1
October	0.4		0	0	0	1
November	1.9		0	1	3	0
December	3.1		1	1	7	7
Average	2.5	3.6	2.6	3.8	1.7	1.7

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 (miles per hour)

Month	Average	2025	2024	2023	2022	2021
January	5.8	6	6	7	4	6
February	6.8	6	7	7	7	6
March	7.0		7	8	7	7
April	7.1		7	7	8	7
May	7.2		7	7	8	7
June	6.5		6	7	6	6
July	6.3		6	6	6	7
August	6.6		6	7	7	7
September	6.6		7	6	7	7
October	6.2		6	6	6	7
November	6.0		6	6	7	5
December	5.3		5	5	6	6
Average	6.4	6.2	6.3	6.4	6.6	6.5

Average wind speed

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

Prevailing wind direction

Month	2025	2024	2023	2022	2021
January	W	W	SW	W	W
February	W	SW	W	W	W
March		SW	SW	W	W
April		W	W	W	W
May		W	W	SW	SW
June		SW	W	SW	W
July		W	W	W	W
August		W	W	W	W
September		W	W	W	W
October		W	W	W	W
November		W	W	SW	W
December		W	W	W	W

Prevailing wind direction

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

San Diego County weather Q&A

What is the warmest month in San Diego County?

The warmest month is August with an average temperature of 82 °F over the past years.

What is the coldest month in San Diego County?

The coldest month is February with an average daytime temperature of 67 °F in the past few years.

Which month is the wettest in San Diego County?

Chance of precipitation is the highest in February with a probability of around 6.3 %.

Which month is the driest in San Diego County?

The least rainfall and snow can be expected in July. The probability is about 0.2 %.