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Half Moon Bay Weather in 2021

Historical record of Half Moon Bay, California weather for the year 2021 based on NOAA data.
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2021 Half Moon Bay Weather Extremes
Highest temperature 78 °F October 29
Lowest temperature 30 °F January 21
Highest daily low 60 °F November 22
Lowest daily high 51 °F December 28
Most daily precipitation 5.4 inches December 13
Total annual precipitation 24.6 inches -
January 2021 Half Moon Bay Weather
Day High (°F) Low (°F) Precip. (inches)
January 1
55 34 0.00
January 2
55 44 0.29
January 3
54 40 0.01
January 4
59 48 0.30
January 5
56 37 0.01
January 6
56 39 0.03
January 7
59 41 0.01
January 8
59 46 0.01
January 9
59 40 0.00
January 10
57 36 0.00
January 11
58 45 0.00
January 12
59 43 0.00
January 13
62 44 0.00
January 14
71 50 0.00
January 15
71 43 0.00
January 16
70 43 0.00
January 17
75 41 0.00
January 18
74 39 0.00
January 19
71 57 0.00
January 20
69 54 0.00
January 21
68 30 0.00
January 22
53 47 0.52
January 23
54 41 0.10
January 24
53 39 0.11
January 25
51 43 0.29
January 26
51 34 0.01
January 28
56 45 n/a
January 29
54 37 0.21
January 30
56 38 0.00
January 31
57 43 0.00
February 2021 Half Moon Bay Weather
Day High (°F) Low (°F) Precip. (inches)
February 1
59 39 0.00
February 2
57 51 1.29
February 3
55 34 0.00
February 4
59 38 0.00
February 5
57 34 0.00
February 6
58 35 0.00
February 7
59 37 0.00
February 8
59 38 0.00
February 9
55 47 0.01
February 10
56 41 0.00
February 11
56 40 0.00
February 12
56 50 0.51
February 13
57 51 0.11
February 14
57 49 0.00
February 15
56 50 0.45
February 16
56 49 0.00
February 17
62 35 0.00
February 18
57 34 0.00
February 19
57 48 0.16
February 20
56 49 0.03
February 21
56 37 0.00
February 22
69 39 0.00
February 23
70 41 0.00
February 24
62 35 0.00
February 25
60 46 0.00
February 26
58 34 0.00
February 27
57 34 0.00
February 28
66 35 0.00
March 2021 Half Moon Bay Weather
Day High (°F) Low (°F) Precip. (inches)
March 1
59 39 0.00
March 2
59 34 0.00
March 3
56 37 0.00
March 4
56 55 0.00
March 5
59 36 0.00
March 6
59 40 0.43
March 7
55 33 0.00
March 8
56 49 0.00
March 9
55 41 0.00
March 10
55 42 0.60
March 11
56 40 0.27
March 12
57 37 0.00
March 13
56 49 0.00
March 14
56 47 0.00
March 15
55 42 0.16
March 16
53 33 0.00
March 17
53 35 0.00
March 18
57 46 0.26
March 19
56 50 0.08
March 20
56 39 0.03
March 21
57 35 0.00
March 22
56 47 0.00
March 23
57 41 0.00
March 24
61 40 0.00
March 25
56 48 0.00
March 26
64 35 0.00
March 28
65 34 0.00
March 29
55 38 0.00
March 30
74 37 0.00
March 31
74 40 0.00
April 2021 Half Moon Bay Weather
Day High (°F) Low (°F) Precip. (inches)
April 1
73 44 0.00
April 2
65 40 0.00
April 3
58 49 0.00
April 4
59 50 0.00
April 5
57 46 0.00
April 6
56 47 0.00
April 7
56 54 0.00
April 8
56 49 0.00
April 9
56 42 0.00
April 10
55 47 0.00
April 11
58 42 0.00
April 12
57 48 0.00
April 13
56 48 0.00
April 14
59 48 0.00
April 15
58 40 0.00
April 16
57 45 0.00
April 17
55 49 0.00
April 18
56 42 0.00
April 19
55 46 0.00
April 20
57 50 0.00
April 21
54 49 0.00
April 22
55 49 0.00
April 23
58 49 0.00
April 24
58 47 0.00
April 25
59 47 0.02
April 26
57 38 0.02
April 27
58 41 0.00
April 28
61 40 0.00
April 29
61 46 0.00
April 30
59 42 0.02
May 2021 Half Moon Bay Weather
Day High (°F) Low (°F) Precip. (inches)
May 1
57 41 0.01
May 2
60 44 0.02
May 3
62 40 0.00
May 4
62 42 0.00
May 5
58 41 0.00
May 6
57 48 0.00
May 7
60 50 0.00
May 8
63 38 0.00
May 9
64 40 0.00
May 10
62 43 0.00
May 11
59 43 0.00
May 12
58 46 0.00
May 13
57 49 0.00
May 14
55 50 0.00
May 15
55 50 0.07
May 16
58 50 0.01
May 17
58 50 0.02
May 18
60 52 0.00
May 19
60 50 0.00
May 20
57 46 0.00
May 21
59 41 0.00
May 22
58 46 0.00
May 23
58 50 0.00
May 24
58 50 0.00
May 25
58 51 0.00
May 26
59 42 0.00
May 27
62 42 0.00
May 28
60 51 0.00
May 29
59 51 0.01
May 30
59 51 0.00
May 31
62 42 0.00
June 2021 Half Moon Bay Weather
Day High (°F) Low (°F) Precip. (inches)
June 1
61 48 0.00
June 2
60 48 0.00
June 3
60 52 0.00
June 4
60 50 0.00
June 5
60 49 0.00
June 6
61 46 0.00
June 7
61 52 0.00
June 8
61 52 0.00
June 9
62 45 0.00
June 10
63 46 0.00
June 11
63 51 0.00
June 12
65 55 0.00
June 13
65 57 0.00
June 14
64 59 0.04
June 15
66 50 0.00
June 16
66 45 0.00
June 17
67 46 0.00
June 18
67 45 0.00
June 19
66 52 0.00
June 20
63 54 0.00
June 21
66 56 0.00
June 22
68 58 0.01
June 23
69 57 0.03
June 24
69 58 0.00
June 25
66 55 0.00
June 26
64 55 0.00
June 27
65 56 0.02
June 28
65 55 0.01
June 29
63 56 0.00
June 30
63 56 0.02
July 2021 Half Moon Bay Weather
Day High (°F) Low (°F) Precip. (inches)
July 1
66 57 0.03
July 2
66 57 0.04
July 3
64 55 0.04
July 4
65 55 0.01
July 5
65 55 0.02
July 6
63 54 0.01
July 7
61 52 0.00
July 8
61 55 0.00
July 9
63 49 0.00
July 10
62 53 0.00
July 11
61 53 0.00
July 12
61 53 0.00
July 13
62 53 0.01
July 14
64 53 0.00
July 15
64 53 0.01
July 16
60 53 0.01
July 17
n/a 52 0.00
July 18
64 53 0.00
July 19
63 53 0.00
July 20
61 55 0.00
July 21
61 55 0.00
July 22
63 55 0.00
July 23
62 54 0.00
July 24
63 53 0.00
July 25
64 55 0.00
July 26
62 55 0.01
July 27
65 55 0.00
July 28
65 54 0.00
July 29
64 56 0.00
July 30
64 55 0.01
July 31
66 57 0.00
August 2021 Half Moon Bay Weather
Day High (°F) Low (°F) Precip. (inches)
August 1
67 56 0.00
August 2
67 54 0.00
August 3
66 55 0.00
August 4
64 53 0.00
August 5
64 56 0.03
August 6
64 56 0.00
August 7
64 52 0.03
August 8
65 55 0.01
August 9
66 55 0.00
August 10
66 56 0.00
August 11
65 55 0.00
August 12
65 58 0.00
August 13
66 56 0.00
August 14
66 58 0.00
August 15
64 57 0.00
August 16
65 58 0.00
August 17
66 59 0.00
August 18
66 50 0.00
August 19
67 52 0.00
August 20
67 53 0.00
August 21
67 59 0.00
August 22
66 57 0.00
August 23
66 56 0.00
August 24
66 56 0.00
August 25
66 55 0.00
August 26
65 56 0.00
August 27
69 49 0.00
August 28
68 48 0.00
August 29
67 56 0.00
August 30
64 56 0.00
August 31
65 47 0.00
September 2021 Half Moon Bay Weather
Day High (°F) Low (°F) Precip. (inches)
September 1
67 55 0.00
September 2
67 56 0.00
September 3
63 56 0.00
September 4
62 52 0.00
September 5
62 50 0.00
September 6
61 48 0.00
September 7
63 52 0.00
September 8
65 53 0.00
September 9
65 55 0.00
September 10
63 58 0.00
September 11
62 56 0.00
September 12
62 52 0.00
September 13
61 50 0.00
September 14
63 51 0.00
September 15
65 54 0.00
September 16
n/a 54 0.00
September 17
64 54 0.00
September 18
64 56 0.02
September 19
65 57 0.06
September 20
69 47 0.00
September 21
77 51 0.01
September 22
70 52 0.00
September 23
62 52 0.00
September 24
62 52 0.00
September 25
64 56 0.00
September 26
62 57 0.00
September 27
65 54 0.03
September 28
65 50 0.06
September 29
64 42 0.00
September 30
63 42 0.00
October 2021 Half Moon Bay Weather
Day High (°F) Low (°F) Precip. (inches)
October 1
67 41 0.00
October 2
65 44 0.00
October 3
62 40 0.00
October 4
64 42 0.00
October 5
61 51 0.00
October 6
60 54 0.00
October 7
60 50 0.00
October 8
60 53 0.00
October 9
64 48 0.00
October 10
72 41 0.00
October 11
64 48 0.00
October 12
63 51 0.00
October 13
60 38 0.01
October 14
71 40 0.00
October 15
77 39 0.00
October 16
78 38 0.00
October 17
78 38 0.00
October 18
59 44 0.05
October 19
61 39 0.00
October 20
62 53 0.03
October 21
67 59 1.08
October 22
65 46 1.07
October 23
61 52 0.00
October 24
60 59 0.94
October 25
63 55 2.08
October 26
62 48 0.01
October 27
66 50 0.00
October 28
77 50 0.00
October 29
78 50 0.00
October 30
61 54 0.00
October 31
63 50 0.02
November 2021 Half Moon Bay Weather
Day High (°F) Low (°F) Precip. (inches)
November 1
62 55 0.10
November 2
64 57 0.15
November 3
65 47 0.01
November 4
63 53 0.18
November 5
63 42 0.00
November 6
63 46 0.00
November 7
64 40 0.00
November 8
60 42 0.00
November 9
64 51 0.33
November 10
62 51 0.00
November 11
71 48 0.00
November 12
73 47 0.00
November 13
75 49 0.00
November 14
76 46 0.00
November 15
75 49 0.00
November 16
65 52 0.00
November 17
65 45 0.00
November 18
61 43 0.00
November 19
59 50 0.05
November 20
65 51 0.02
November 21
67 45 0.00
November 22
72 60 0.00
November 23
65 40 0.00
November 24
66 40 0.00
November 25
66 44 0.00
November 26
66 53 0.00
November 27
66 41 0.00
November 28
72 44 0.00
November 29
71 46 0.00
November 30
71 44 0.00
December 2021 Half Moon Bay Weather
Day High (°F) Low (°F) Precip. (inches)
December 1
74 42 0.00
December 2
62 41 0.00
December 3
56 50 0.00
December 4
57 52 0.00
December 5
57 44 0.00
December 6
57 45 0.00
December 7
61 51 0.10
December 8
61 48 0.03
December 9
56 50 0.05
December 10
56 35 0.00
December 11
55 31 0.11
December 12
55 40 0.11
December 13
57 51 5.38
December 14
55 43 0.91
December 15
54 39 0.14
December 16
55 48 0.67
December 17
56 43 0.02
December 18
54 38 0.00
December 19
54 38 0.00
December 20
59 42 0.00
December 21
60 45 0.01
December 22
58 48 0.75
December 23
58 53 1.00
December 24
56 48 0.27
December 25
55 48 0.38
December 26
53 43 0.16
December 27
52 46 0.53
December 28
51 41 0.05
December 29
53 47 0.47
December 30
55 43 0.16
December 31
54 38 0.01
Weather Station Details
Years Station Coordinates
1939–2022 Half Moon Bay location