Weather in Waltham, Massachusetts
Roses open along the stoops. Day 59 of spring. Read this microseason across nine climate regions →
Waltham, MA
Sunday, May 17 at 2:33 AM
65
°
Clear
Feels like
59°
Humidity
45%
Wind
10 mph
Sunrise
5:22 AM
Sunset
8:00 PM
Waltham, MA
Hour by hour · 24h
53°
21%
10p
51°
10%
11p
51°
12a
52°
1a
51°
2a
51°
3a
51°
4a
51°
5a
51°
6a
51°
7a
53°
8a
54°
9a
55°
10a
57°
11a
56°
12p
54°
1p
53°
2p
54°
3p
53°
4p
52°
10%
5p
53°
6p
54°
7p
53°
8p
51°
9p
Waltham, MA
7-day forecast
- TodayMay 16Foggy—80°43°
- SundayMay 17Light Drizzle15%88°60°
- MondayMay 18Overcast—71°57°
- TuesdayMay 19Rain14%96°61°
- WednesdayMay 20Showers69%93°61°
- ThursdayMay 21Overcast24%67°53°
- FridayMay 22Overcast—72°51°
Waltham, MA
Next 24 hours · Cool now
Waltham, MA
Anemometer · 24h winds · from true
From · True
SSW
204° · veering 56°
Direction
SSW
204°
Sustained
10
mph
Gust
27
mph
Peak 24h
32
avg 9
Beaufort · 3 · GENTLE 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
Waltham, MA
Air quality
71
AQI
Moderate
- PM 2.5
- 10.7 μg/m³
- PM 10
- 13.2 μg/m³
- NO₂
- 9.8 μg/m³
- Ozone
- 98.0 μg/m³
- UV Index
- 0.0 Low
Waltham, MA
Almanac · Sunday, May 17
When the dew is on the grass, rain will never come to pass.
Civil dawn
8:51 AM
Sunrise
5:22 AM
Daylight
14h 38m
Sunset
8:00 PM
Civil dusk
12:33 AM
Planting note
Direct sow okra, melons, and southern peas. Thin carrot rows.
Waltham, MA
The moon
New Moon
0% illuminated
- Moonrise
- 9:22 AM
- Moonset
- 12:29 AM
- In sign
- ♊︎ Gemini
Waltham, MA
Microseason · 28 of 72
May 16–20
Roses open along the stoops
plant
Waltham at a glance
- Today vs. normal: 4°F below the seasonal normal for this latitude
- Last frost: April 30 (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
Cool-season window is open
As of May 17, the cool-season window is open or about to open. Direct-sow peas, lettuce, spinach, radishes, and brassicas now. Hold off on warm-season crops until 1–2 weeks after the last spring frost (around May).