Weather in San Mateo, California
Fog and sun in daily rhythm. Day 59 of spring. Read this microseason across nine climate regions →
San Mateo, CA
Sunday, May 17 at 12:52 AM
62
°
Clear
Feels like
54°
Humidity
60%
Wind
17 mph
Sunrise
5:58 AM
Sunset
8:12 PM
San Mateo, CA
Hour by hour · 24h
69°
5p
67°
6p
64°
7p
59°
8p
57°
9p
55°
10p
54°
11p
52°
12a
52°
1a
51°
2a
51°
3a
50°
4a
49°
5a
49°
6a
52°
7a
59°
8a
63°
9a
66°
10a
69°
11a
72°
12p
72°
1p
71°
2p
70°
3p
69°
4p
San Mateo, CA
7-day forecast
- TodayMay 16Clear—68°53°
- SundayMay 17Overcast—73°51°
- MondayMay 18Overcast—78°59°
- TuesdayMay 19Mostly Clear—88°57°
- WednesdayMay 20Overcast—82°57°
- ThursdayMay 21Overcast—79°57°
- FridayMay 22Overcast—75°57°
San Mateo, CA
Next 24 hours · Mild now
San Mateo, CA
Anemometer · 24h winds · from true
From · True
NW
304° · veering 18°
Direction
NW
304°
Sustained
17
mph
Gust
29
mph
Peak 24h
34
avg 15
Beaufort · 4 · MOD BRZ
0
CALM
<1
1
LIGHT AIR
1–3
2
LIGHT BRZ
4–7
3
GENTLE BRZ
8–12
4
MOD BRZ
13–18
5
FRESH BRZ
19–24
6
STRONG BRZ
25–31
7
NEAR GALE
32–38
24h · sust vs gust · mph
−24h−18h−12h−6hnow
San Mateo, CA
Air quality
40
AQI
Good
- PM 2.5
- 8.9 μg/m³
- PM 10
- 14.5 μg/m³
- NO₂
- 2.0 μg/m³
- Ozone
- 84.0 μg/m³
- UV Index
- 2.3 Low
San Mateo, CA
Almanac · Sunday, May 17
When the dew is on the grass, rain will never come to pass.
Civil dawn
12:31 PM
Sunrise
5:58 AM
Daylight
14h 14m
Sunset
8:12 PM
Civil dusk
3:42 AM
Planting note
Direct sow okra, melons, and southern peas. Thin carrot rows.
San Mateo, CA
The moon
New Moon
0% illuminated
- Moonrise
- 1:12 PM
- Moonset
- 3:46 AM
- In sign
- ♉︎ Taurus
San Mateo, CA
Microseason · 28 of 72
May 16–20
Fog and sun in daily rhythm
plant
San Mateo at a glance
- Today vs. normal: 12°F below the seasonal normal for this latitude
- Last frost: April 1 (climatological average for this latitude)
- Microseason: 28 of 72, May 16–20
- Planting window: Direct sow okra, melons, and southern peas. Thin carrot rows.
Right now in the garden
Warm-season window is open
As of May 17, the last spring frost has passed for most years. Transplant tomatoes, peppers, eggplants, basil, and cucurbits (cucumbers, squash, melons) now. Direct-sow beans and corn into warm soil.