Oak Harbor weather by month
What a typical year looks like in Oak Harbor, Washington: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at WHIDBEY ISLAND NAS, 7 km from Oak Harbor; records cover 1945–2026.
The year at a glance
- Precipitation a year
- 19.9 in506 mm
- Snow a year
- 5 in14 cm
- Last spring freeze
- Mar 27
- First fall freeze
- Nov 2
- Heating degree days
- 4,726
- Cooling degree days
- 24
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 22°−6° (heating, 99%) and 77°25° (cooling, 1%).
Month by month
Oak Harbor in January
Highs average 49°10° and lows 38°3°, with 2.4 in62 mm of precipitation and 1.1 in2.8 cm of snow in a typical January.
- Record high
- 65°18° (1981)
- Record low
- −1°−18° (1950)
- Heating degree days
- 660
- Cooling degree days
- 0
Oak Harbor in February
Highs average 51°11° and lows 37°3°, with 1.6 in41 mm of precipitation and 1 in2.5 cm of snow in a typical February.
- Record high
- 70°21° (1986)
- Record low
- 6°−14° (1950)
- Heating degree days
- 584
- Cooling degree days
- 0
Oak Harbor in March
Highs average 55°13° and lows 40°5°, with 1.7 in43 mm of precipitation and 0.6 in1.5 cm of snow in a typical March.
- Record high
- 76°24° (2019)
- Record low
- 16°−9° (1955)
- Heating degree days
- 549
- Cooling degree days
- 0
Oak Harbor in April
Highs average 58°15° and lows 43°6°, with 1.7 in43 mm of precipitation in a typical April.
- Record high
- 78°26° (1976)
- Record low
- 25°−4° (2011)
- Heating degree days
- 423
- Cooling degree days
- 0
Oak Harbor in May
Highs average 62°17° and lows 48°9°, with 1.7 in43 mm of precipitation in a typical May.
- Record high
- 82°28° (1959)
- Record low
- 32°0° (1954)
- Heating degree days
- 310
- Cooling degree days
- 0
Oak Harbor in June
Highs average 66°19° and lows 52°11°, with 1.1 in28 mm of precipitation in a typical June.
- Record high
- 85°29° (1955)
- Record low
- 37°3° (1955)
- Heating degree days
- 192
- Cooling degree days
- 2
Oak Harbor in July
Highs average 69°21° and lows 54°12°, with 0.63 in16 mm of precipitation in a typical July.
- Record high
- 88°31° (2015)
- Record low
- 40°4° (2009)
- Heating degree days
- 117
- Cooling degree days
- 8
Oak Harbor in August
Highs average 70°21° and lows 54°12°, with 0.85 in22 mm of precipitation in a typical August.
- Record high
- 88°31° (1960)
- Record low
- 39°4° (1980)
- Heating degree days
- 110
- Cooling degree days
- 11
Oak Harbor in September
Highs average 67°19° and lows 50°10°, with 1.1 in27 mm of precipitation in a typical September.
- Record high
- 88°31° (1986)
- Record low
- 29°−2° (1972)
- Heating degree days
- 198
- Cooling degree days
- 3
Oak Harbor in OctoberThis month
Highs average 60°16° and lows 46°8°, with 2 in52 mm of precipitation in a typical October.
- Record high
- 76°24° (2005)
- Record low
- 22°−6° (1971)
- Heating degree days
- 375
- Cooling degree days
- 0
Oak Harbor in November
Highs average 54°12° and lows 41°5°, with 3.1 in80 mm of precipitation and 0.3 in0.8 cm of snow in a typical November.
- Record high
- 72°22° (2016)
- Record low
- 9°−13° (1955)
- Heating degree days
- 534
- Cooling degree days
- 0
Oak Harbor in December
Highs average 49°9° and lows 38°3°, with 2 in50 mm of precipitation and 2.4 in6.1 cm of snow in a typical December.
- Record high
- 63°17° (2014)
- Record low
- 3°−16° (1964)
- Heating degree days
- 674
- Cooling degree days
- 0