Weather in San Juan County

Calculated from weather data of Orcas Island Airport (KORS) between 2020 and 2024.

Maximum temperatures (°F)

Month	Average	2024	2023	2022	2021	2020
January	47.0	46.0	49.0	46.0	48.0	48.0
February	45.0	49.0	46.0	46.0	44.0	47.0
March	50.0	51.0	50.0	51.0	51.0	48.0
April	55.0		54.0	53.0	57.0	56.0
May	61.0		66.0	58.0	61.0	48.0
June	68.0		69.0	66.0	71.0	67.0
July	72.0		73.0	73.0	74.0	70.0
August	72.0		73.0	74.0	72.0	71.0
September	66.0		65.0	68.0	66.0	68.0
October	57.0		57.0	60.0	56.0	56.0
November	50.0		51.0	47.0	52.0	50.0
December	46.0		52.0	40.0	41.0	48.0
Average	56.0	48.0	59.0	57.0	58.0	56.0

Average highest temperature per day

The maximum temperature is typically observed some hours after noon.

Minimum temperatures (°F)

Month	Average	2024	2023	2022	2021	2020
January	39.0	37	41	37	40	39
February	37.0	41	37	38	36	38
March	40.0	41	38	42	40	39
April	44.0		43	42	44	44
May	47.0		51	47	48	33
June	54.0		53	54	55	55
July	56.0		56	57	57	55
August	56.0		58	58	58	54
September	53.0		53	53	51	55
October	47.0		48	49	47	48
November	42.0		42	38	44	42
December	39.0		44	34	34	40
Average	45.0	39.0	47.0	46.0	46.0	45.0

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
86 °F or warmer	0	0	0	1	0
77 °F or warmer	0	9	12	14	4
68 °F or warmer	0	84	68	81	62
32 °F or colder	8	7	17	14	10

Precipitation (%)

Month	Average	2024	2023	2022	2021	2020
January	14.2	16	16	11	13	26
February	14.3	13	14	8	18	11
March	10.2	11	12	14	8	7
April	10.9		14	9	8	6
May	5.9		6	12	7	2
June	7.3		6	10	9	12
July	3.4		5	4	1	6
August	2.6		5	2	3	3
September	8.2		5	6	13	7
October	13.1		14	10	26	6
November	14.6		5	13	31	16
December	16.0		16	21	17	15
Average	10.0	13.3	9.3	9.3	11.8	9.1

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	2024	2023	2022	2021	2020
January	6.7	5	7	6	7	9
February	6.9	6	7	6	7	7
March	6.3	6	7	7	7	7
April	6.8		8	7	6	5
May	5.4		6	7	6	1
June	6.8		8	6	6	7
July	7.0		7	6	7	7
August	6.4		5	7	7	7
September	5.5		5	6	6	6
October	6.1		5	6	7	7
November	6.7		5	6	7	8
December	6.3		5	7	7	6
Average	6.3	5.5	6.3	6.5	6.6	6.2

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	SE	SE	S	S	S
February	SW	S	S	SE	S
March	S	S	S	S	S
April		S	SW	SW	SW
May		S	S	S	SW
June		S	S	S	S
July		S	S	S	S
August		S	S	S	S
September		S	W	S	S
October		SW	S	S	S
November		SW	E	S	S
December		S	NE	SE	SE

Prevailing wind direction

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

San Juan County weather Q&A

What is the warmest month in San Juan County?

The warmest month is August with an average temperature of 72 °F over the past years.

What is the coldest month in San Juan County?

The coldest month is February with an average daytime temperature of 45 °F in the past few years.

Which month is the wettest in San Juan County?

Chance of precipitation is the highest in December with a probability of around 16.0 %.

Which month is the driest in San Juan County?

The least rainfall and snow can be expected in August. The probability is about 2.7 %.