Weather in Portola Valley, California
Fog and sun in daily rhythm. Day 59 of spring. Read this microseason across nine climate regions →
Portola Valley, CA
Sunday, May 17 at 12:53 AM
64
°
Clear
Feels like
57°
Humidity
51%
Wind
14 mph
Sunrise
5:58 AM
Sunset
8:11 PM
Portola Valley, CA
Hour by hour · 24h
70°
5p
69°
6p
65°
7p
59°
8p
59°
9p
59°
10p
59°
11p
57°
12a
56°
1a
55°
2a
56°
3a
56°
4a
54°
5a
53°
6a
56°
7a
60°
8a
64°
9a
69°
10a
73°
11a
76°
12p
77°
1p
73°
2p
70°
3p
67°
4p
Portola Valley, CA
7-day forecast
- TodayMay 16Mostly Clear—72°53°
- SundayMay 17Overcast—71°50°
- MondayMay 18Clear—78°49°
- TuesdayMay 19Clear—85°50°
- WednesdayMay 20Overcast—84°51°
- ThursdayMay 21Overcast—82°50°
- FridayMay 22Overcast—79°49°
Portola Valley, CA
Next 24 hours · Mild now
Portola Valley, CA
Anemometer · 24h winds · from true
From · True
W
263° · backing 9°
Direction
W
263°
Sustained
14
mph
Gust
18
mph
Peak 24h
21
avg 10
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
Portola Valley, CA
Air quality
41
AQI
Good
- PM 2.5
- 10.1 μg/m³
- PM 10
- 17.0 μg/m³
- NO₂
- 0.7 μg/m³
- Ozone
- 87.0 μg/m³
- UV Index
- 2.3 Low
Portola Valley, 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 13m
Sunset
8:11 PM
Civil dusk
3:42 AM
Planting note
Direct sow okra, melons, and southern peas. Thin carrot rows.
Portola Valley, CA
The moon
New Moon
0% illuminated
- Moonrise
- 1:12 PM
- Moonset
- 3:45 AM
- In sign
- ♉︎ Taurus
Portola Valley, CA
Microseason · 28 of 72
May 16–20
Fog and sun in daily rhythm
plant
Portola Valley at a glance
- Today vs. normal: 10°F below the seasonal normal for this latitude
- Last frost: March 31 (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.