KSFO — SAN FRANCISCO
San Francisco, CA, US · America/Los_Angeles · 37.6190°, -122.3749° · 3m elevation
Daily METAR Observations
| Time | Temperature | Dew Point | Humidity | Wind | Wind Speed | Wind Gust | Pressure | Precip. | Condition |
|---|---|---|---|---|---|---|---|---|---|
| 12:56 AM | 56 °F 55.9 °F 13 °C 13.3 °C | 54 °F 54 °F 12 °C 12.2 °C | 93 % | WNW | 10 mph 9 kt 17 km/h | 0 mph 0 kt 0 km/h | 29.85 in | 0.0 in | Fair |
| METAR KSFO 130756Z 29009KT 10SM FEW002 13/12 A2985 RMK AO2 SLP108 T01330122 402330133 $ | |||||||||
| 1:56 AM | 56 °F 55.9 °F 13 °C 13.3 °C | 54 °F 54 °F 12 °C 12.2 °C | 93 % | NW | 8 mph 7 kt 13 km/h | 0 mph 0 kt 0 km/h | 29.85 in | 0.0 in | Fair |
| METAR KSFO 130856Z 31007KT 10SM FEW002 13/12 A2985 RMK AO2 SLP106 T01330122 58006 $ | |||||||||
| 2:56 AM | 56 °F 55.9 °F 13 °C 13.3 °C | 53 °F 53.1 °F 12 °C 11.7 °C | 90 % | WNW | 10 mph 9 kt 17 km/h | 0 mph 0 kt 0 km/h | 29.84 in | 0.0 in | Fair |
| METAR KSFO 130956Z 29009KT 10SM FEW002 13/12 A2984 RMK AO2 SLP105 T01330117 $ | |||||||||
| 3:20 AM | 55 °F 55 °F 13 °C 12.8 °C | 53 °F 53.1 °F 12 °C 11.7 °C | 93 % | WNW | 9 mph 8 kt 15 km/h | 0 mph 0 kt 0 km/h | 29.84 in | 0.0 in | Mostly Cloudy |
| SPECI KSFO 131020Z 29008KT 10SM FEW002 BKN010 13/12 A2984 RMK AO2 T01280117 $ | |||||||||
| 3:52 AM | 55 °F 55.4 °F 13 °C 13 °C | 54 °F 53.6 °F 12 °C 12 °C | 94 % | WNW | 7 mph 6 kt 11 km/h | 0 mph 0 kt 0 km/h | 29.84 in | 0.0 in | Partly Cloudy |
| SPECI KSFO 131052Z 29006KT 10SM FEW002 SCT010 13/12 A2984 RMK AO2 $ | |||||||||
| 3:56 AM | 55 °F 55 °F 13 °C 12.8 °C | 53 °F 53.1 °F 12 °C 11.7 °C | 93 % | WNW | 7 mph 6 kt 11 km/h | 0 mph 0 kt 0 km/h | 29.84 in | 0.0 in | Partly Cloudy |
| METAR KSFO 131056Z 29006KT 10SM FEW002 SCT010 13/12 A2984 RMK AO2 SLP104 T01280117 $ | |||||||||
| 4:42 AM | 55 °F 55 °F 13 °C 12.8 °C | 53 °F 53.1 °F 12 °C 11.7 °C | 93 % | WNW | 4 mph 3 kt 6 km/h | 0 mph 0 kt 0 km/h | 29.84 in | 0.0 in | Mostly Cloudy |
| SPECI KSFO 131142Z 29003KT 10SM FEW002 BKN007 13/12 A2984 RMK AO2 T01280117 $ | |||||||||
| 4:56 AM | 55 °F 55 °F 13 °C 12.8 °C | 53 °F 53.1 °F 12 °C 11.7 °C | 93 % | WNW | 6 mph 5 kt 9 km/h | 0 mph 0 kt 0 km/h | 29.85 in | 0.0 in | Mostly Cloudy |
| METAR KSFO 131156Z 29005KT 10SM FEW002 BKN007 13/12 A2985 RMK AO2 SLP107 T01280117 10139 20128 53001 $ | |||||||||
| 5:56 AM | 57 °F 57 °F 14 °C 13.9 °C | 54 °F 54 °F 12 °C 12.2 °C | 89 % | SW | 5 mph 4 kt 7 km/h | 0 mph 0 kt 0 km/h | 29.85 in | 0.0 in | Mostly Cloudy |
| METAR KSFO 131256Z 22004KT 10SM FEW002 BKN007 14/12 A2985 RMK AO2 SLP109 T01390122 $ | |||||||||
| 6:56 AM | 57 °F 57 °F 14 °C 13.9 °C | 54 °F 54 °F 12 °C 12.2 °C | 89 % | WSW | 4 mph 3 kt 6 km/h | 0 mph 0 kt 0 km/h | 29.87 in | 0.0 in | Mostly Cloudy |
| METAR KSFO 131356Z 25003KT 10SM FEW004 BKN007 14/12 A2987 RMK AO2 SLP115 T01390122 $ | |||||||||
| 7:56 AM | 58 °F 57.9 °F 14 °C 14.4 °C | 54 °F 54 °F 12 °C 12.2 °C | 87 % | NW | 4 mph 3 kt 6 km/h | 0 mph 0 kt 0 km/h | 29.88 in | 0.0 in | Mostly Cloudy |
| METAR KSFO 131456Z 32003KT 10SM FEW004 BKN009 BKN011 14/12 A2988 RMK AO2 SLP119 T01440122 53013 $ | |||||||||
| 8:56 AM | 60 °F 60.1 °F 16 °C 15.6 °C | 56 °F 55.9 °F 13 °C 13.3 °C | 86 % | ENE | 5 mph 4 kt 7 km/h | 0 mph 0 kt 0 km/h | 29.89 in | 0.0 in | Mostly Cloudy |
| METAR KSFO 131556Z 07004KT 10SM FEW004 BKN009 BKN011 16/13 A2989 RMK AO2 SLP120 T01560133 $ | |||||||||
| 9:17 AM | 62 °F 62.1 °F 17 °C 16.7 °C | 56 °F 55.9 °F 13 °C 13.3 °C | 80 % | ENE | 4 mph 3 kt 6 km/h | 0 mph 0 kt 0 km/h | 29.89 in | 0.0 in | Mostly Cloudy |
| SPECI KSFO 131617Z 07003KT 10SM FEW006 BKN011 17/13 A2989 RMK AO2 T01670133 $ | |||||||||
| 9:34 AM | 63 °F 63 °F 17 °C 17.2 °C | 56 °F 55.9 °F 13 °C 13.3 °C | 78 % | NE | 6 mph 5 kt 9 km/h | 0 mph 0 kt 0 km/h | 29.89 in | 0.0 in | Partly Cloudy |
| SPECI KSFO 131634Z 05005KT 10SM FEW006 SCT011 17/13 A2989 RMK AO2 T01720133 $ | |||||||||
| 9:56 AM | 63 °F 63 °F 17 °C 17.2 °C | 56 °F 55.9 °F 13 °C 13.3 °C | 78 % | NE | 7 mph 6 kt 11 km/h | 0 mph 0 kt 0 km/h | 29.89 in | 0.0 in | Partly Cloudy |
| METAR KSFO 131656Z 04006KT 10SM FEW006 SCT012 17/13 A2989 RMK AO2 SLP120 T01720133 $ | |||||||||
| 10:56 AM | 64 °F 64 °F 18 °C 17.8 °C | 57 °F 57 °F 14 °C 13.9 °C | 78 % | NE | 6 mph 5 kt 9 km/h | 0 mph 0 kt 0 km/h | 29.88 in | 0.0 in | Fair |
| METAR KSFO 131756Z 05005KT 9SM R28R/4000VP6000FT FEW004 FEW016 18/14 A2988 RMK AO2 SLP116 T01780139 10178 20128 58003 $ | |||||||||
| 11:56 AM | 66 °F 66 °F 19 °C 18.9 °C | 58 °F 57.9 °F 14 °C 14.4 °C | 75 % | NNE | 7 mph 6 kt 11 km/h | 0 mph 0 kt 0 km/h | 29.87 in | 0.0 in | Fair |
| METAR KSFO 131856Z 03006KT 10SM FEW008 FEW016 19/14 A2987 RMK AO2 SLP115 T01890144 $ | |||||||||
| 12:56 PM | 67 °F 66.9 °F 19 °C 19.4 °C | 59 °F 59 °F 15 °C 15 °C | 76 % | NNE | 8 mph 7 kt 13 km/h | 0 mph 0 kt 0 km/h | 29.86 in | 0.0 in | Fair |
| METAR KSFO 131956Z 02007KT 10SM FEW008 19/15 A2986 RMK AO2 SLP112 T01940150 $ | |||||||||
Time Series
Summary
| Temperature (°F) Temperature (°C) | Actual | |
| High Temp | ||
| Low Temp | ||
| Day Average Temp | ||
| Precipitation (in) | Actual | |
| Precipitation | ||
| Dew Point (°F) Dew Point (°C) | Actual | |
| High | ||
| Low | ||
| Average | ||
| Humidity (%) | Actual | |
| Average Humidity | ||
| Wind (mph) Wind (kt) Wind (km/h) | Actual | |
| Max Wind Speed | ||
| Max Wind Gust | ||
| Visibility | ||
| Pressure (in) | Actual | |
| Average Pressure | ||
| Astronomy | Day Length | Rise / Set |
| Actual Time | 14h 47m | 5:45 AM / 8:33 PM |
| Civil Twilight | 5:16 AM / 9:03 PM | |
| Nautical Twilight | 4:37 AM / 9:41 PM | |
| Astronomical Twilight | 3:53 AM / 10:25 PM | |
| Moon: New Moon | ||
Methodology
Day Boundaries & Time
A "day" is defined as midnight to midnight (00:00:00 through 23:59:59) in the station's local time, using the IANA timezone assigned to each station (e.g. America/Chicago, Europe/London). Daylight Saving Time transitions are respected automatically — when a station's local clocks spring forward or fall back, the UTC boundaries of the day shift accordingly. This means a "day" in the spring DST transition is 23 hours, and in the fall transition it is 25 hours. All observations are stored internally in UTC and converted to local time for display.
Temperature
The FAA reports temperature in degrees Celsius. Values are stored to one decimal place — if a source value has additional precision, it is rounded on storage. Fahrenheit values are computed as °F = °C × 9/5 + 32. All temperatures are displayed as whole numbers (rounded to the nearest integer) in both Celsius and Fahrenheit. High and low temperatures are the maximum and minimum observed values for the day. The day average is the arithmetic mean of all observed temperatures, rounded to the nearest whole number.
Dew Point & Relative Humidity
Dew point is stored and displayed using the same rounding method as temperature (whole numbers). Relative humidity is not reported directly in METARs — it is calculated from the temperature and dew point using the Magnus formula: RH = 100 × exp[(17.27 × Td)/(237.7 + Td) − (17.27 × T)/(237.7 + T)], where T is temperature and Td is dew point, both in °C. The result is rounded to the nearest whole percent and clamped between 0% and 100%.
Wind
Wind direction is reported in degrees true (0–360). The compass direction shown (N, NNE, NE, etc.) divides the compass into 16 sectors of 22.5° each. Variable winds (reported as "VRB" in the METAR) are displayed as "CALM". Wind speed is reported in knots (integer). Miles per hour is computed as mph = kt × 1.15078 and kilometers per hour as km/h = kt × 1.852, both displayed as whole numbers. Wind gust is shown only when the METAR includes a gust value.
Pressure
The altimeter setting is reported in inches of mercury (inHg) to two decimal places. This is the station pressure corrected to sea level and is the value displayed. When the METAR also includes sea level pressure in millibars, that value is used in daily summary calculations.
Precipitation
Precipitation accumulations (1-hour, 3-hour, 6-hour, and 24-hour) are included when reported by the station. A value of 0.0005 inches represents trace precipitation in the FAA convention. The daily total in the summary is the sum of all 1-hour accumulations that exceed trace. Not all stations report precipitation data.
Sky Condition & Weather
The "Condition" column is derived from two METAR fields. If a weather phenomena code is present (e.g. RA for rain, SN for snow, FG for fog, TSRA for thunderstorms), it takes priority and the intensity prefix (- for light, + for heavy) is included. When no active weather is reported, the condition is derived from the highest sky cover layer: CLR/SKC/FEW = Fair, SCT = Partly Cloudy, BKN = Mostly Cloudy, OVC = Overcast.