Weather History for Half Moon Bay, CA

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Month of September, 2013

  Max Avg Min Sum
Temperature  
Max Temperature 78 °F 66 °F 59 °F
Mean Temperature 64 °F 59 °F 52 °F
Min Temperature 60 °F 52 °F 41 °F
Degree Days  
Heating Degree Days (base 65) 12 6 1 180
Cooling Degree Days (base 65) 0 0 0 0
Growing Degree Days (base 50) 14 9 2 271
Dew Point  
Dew Point 64 °F 55 °F 37 °F
Precipitation  
Precipitation 0.42 in 0.01 in 0.00 in 0.43 in
Snowdepth - - - -
Wind  
Wind 22 mph 7 mph 0 mph
Gust Wind 30 mph 20 mph 16 mph
Sea Level Pressure  
Sea Level Pressure 30.13 in 29.94 in 29.77 in

Monthly Weather History Graph

Monthly Weather History Graph

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Date:

Astronomy

Sep. 15, 2013 Rise Set
Actual Time 6:52 AM PDT 7:17 PM PDT
Civil Twilight 6:26 AM PDT 7:43 PM PDT
Nautical Twilight 5:55 AM PDT 8:14 PM PDT
Astronomical Twilight 5:23 AM PDT 8:45 PM PDT
Moon 4:45 PM PDT (9/15) 2:40 AM PDT (9/15)
Length of Visible Light 13h 17m
Length of Day
12h 24m
Waxing Gibbous, 83% of the Moon is Illuminated
Sep 15
Waxing Gibbous
Sep 19
Full
Sep 26
Last Quarter
Oct 4
New
Oct 11
First Quarter

Weather History Calendar

Precipitation Actual month total 0.43 Average Month Total: 0.33
Sunday Monday Tuesday Wednesday Thursday Friday Saturday
Partly Cloudy
Actual:
66 | 55 0.00
Average:
65 | 51 0.00
Fog
Actual:
69 | 59 0.00
Average:
65 | 51 0.00
Partly Cloudy
Actual:
68 | 59 0.00
Average:
66 | 51 0.00
Partly Cloudy
Actual:
68 | 59 0.00
Average:
67 | 51 0.00
Partly Cloudy
Actual:
66 | 59 0.00
Average:
65 | 51 0.00
Scattered Clouds
Actual:
78 | 50 0.00
Average:
66 | 51 0.00
Fog
Actual:
71 | 50 0.00
Average:
66 | 51 0.00
Fog
Actual:
62 | 53 0.00
Average:
67 | 51 0.00
Fog
Actual:
64 | 50 0.00
Average:
66 | 51 0.00
Fog
Actual:
64 | 55 0.00
Average:
67 | 51 0.00
Overcast
Actual:
66 | 60 0.00
Average:
67 | 51 0.00
Rain
Actual:
66 | 57 0.00
Average:
66 | 51 0.00
Rain
Actual:
59 | 57 0.01
Average:
66 | 51 0.00
Rain
Actual:
62 | 55 0.00
Average:
67 | 51 0.00
Partly Cloudy
Actual:
66 | 57 0.00
Average:
67 | 50 0.01
Partly Cloudy
Actual:
64 | 57 0.00
Average:
67 | 51 0.02
Partly Cloudy
Actual:
64 | 55 0.00
Average:
67 | 51 0.02
Scattered Clouds
Actual:
66 | 46 0.00
Average:
68 | 51 0.02
Clear
Actual:
64 | 41 0.00
Average:
67 | 52 0.04
Fog
Actual:
64 | 46 0.00
Average:
68 | 51 0.01
Rain
Actual:
62 | 53 0.42
Average:
67 | 50 0.00
Fog
Actual:
64 | 48 0.00
Average:
67 | 51 0.01
Fog
Actual:
71 | 50 0.00
Average:
68 | 50 0.04
Fog
Actual:
66 | 50 0.00
Average:
67 | 51 0.02
Clear
Actual:
62 | 53 0.00
Average:
68 | 51 0.03
Clear
Actual:
64 | 44 0.00
Average:
67 | 52 0.03
Clear
Actual:
68 | 41 0.00
Average:
67 | 51 0.02
Scattered Clouds
Actual:
66 | 41 0.00
Average:
67 | 51 0.01
Fog
Actual:
68 | 48 0.00
Average:
67 | 50 0.01
Fog
Actual:
66 | 57 0.00
Average:
67 | 50 0.04
 

Calendar Legend

Sunny
Clear
Mostly Cloudy
Partly Sunny
Partly Cloudy
Mostly Sunny
Cloudy Rain Snow
Hail
Flurries
Thunderstorms Hazy
Fog
Sleet '?' denotes
'chance of'
Unknown

Daily Weather History & Observations

2013 Temp. (°F) Dew Point (°F) Humidity (%) Sea Level Press. (in) Visibility (mi) Wind (mph) Precip. (in) Events
Sep high avg low high avg low high avg low high avg low high avg low high avg high sum  
1 66 60 55 63 58 54 100 90 77 29.98 29.96 29.93 10 9 1 17 7 20 0.00  
2 69 64 59 64 62 59 100 92 78 30.00 29.96 29.93 10 7 0 14 6 18 0.00 Fog
3 68 64 59 63 60 57 100 90 73 30.05 30.00 29.97 10 8 1 14 7 17 0.00  
4 68 64 59 63 60 57 94 89 78 30.07 30.03 30.00 10 7 5 17 9 23 0.00  
5 66 62 59 59 59 57 94 87 78 30.07 30.03 30.00 9 8 4 18 12 25 0.00  
6 78 64 50 57 53 46 100 73 36 30.02 29.93 29.84 10 9 3 22 9 28 0.00  
7 71 60 50 59 54 46 100 84 56 29.91 29.88 29.85 10 6 0 9 2 - 0.00 Fog
8 62 58 53 59 56 54 100 96 82 29.91 29.87 29.81 10 3 0 8 4 - 0.00 Fog
9 64 57 50 59 56 50 100 95 77 29.84 29.81 29.77 10 3 0 12 3 16 0.00 Fog
10 64 60 55 59 58 55 100 92 77 29.93 29.86 29.78 10 5 0 18 10 24 0.00 Fog
11 66 63 60 59 57 57 88 84 73 30.03 29.98 29.92 10 9 6 12 7 - 0.00  
12 66 62 57 63 59 57 100 93 73 30.01 29.97 29.94 10 5 1 17 5 21 0.00 Rain
13 59 58 57 57 57 55 100 97 88 29.95 29.90 29.83 10 4 0 17 9 23 0.01 Fog , Rain
14 62 58 55 57 56 55 100 93 82 29.88 29.84 29.81 10 6 1 16 12 23 0.00 Rain
15 66 62 57 61 57 55 94 84 68 29.90 29.87 29.83 10 9 2 14 10 20 0.00  
16 64 60 57 61 58 55 100 90 73 29.93 29.90 29.86 10 7 2 16 8 21 0.00  
17 64 60 55 59 55 50 94 85 72 29.94 29.91 29.88 9 6 5 22 13 30 0.00  
18 66 56 46 55 50 45 100 82 56 29.94 29.90 29.87 9 6 3 21 7 25 0.00  
19 64 52 41 55 49 41 100 84 59 29.89 29.85 29.80 10 7 4 18 5 29 0.00  
20 64 55 46 64 56 45 100 96 83 29.90 29.86 29.82 10 6 0 10 3 - 0.00 Fog
21 62 58 53 61 58 54 100 97 82 29.93 29.87 29.84 8 4 0 17 7 24 0.42 Fog , Rain
22 64 56 48 57 54 48 100 92 73 30.03 29.99 29.93 10 6 0 15 4 18 0.00 Fog
23 71 60 50 61 55 48 100 85 57 30.03 30.00 29.97 10 8 0 20 8 25 0.00 Fog
24 66 58 50 57 55 50 100 88 73 30.04 29.99 29.96 9 6 0 17 6 24 0.00 Fog
25 62 58 53 54 52 48 94 80 63 29.99 29.93 29.87 10 7 5 20 14 30 0.00  
26 64 54 44 48 46 41 93 73 49 30.00 29.93 29.87 10 8 5 20 10 24 0.00  
27 68 54 41 54 44 37 100 70 35 30.11 30.07 30.01 10 8 2 20 5 24 0.00  
28 66 54 41 57 48 37 100 78 46 30.12 30.08 30.05 10 9 5 16 3 23 0.00  
29 68 58 48 61 56 48 100 89 73 30.13 30.11 30.08 10 7 0 12 2 - 0.00 Fog
30 66 62 57 64 58 48 100 92 67 30.10 30.06 30.01 10 3 0 15 5 21 0.00 Fog