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 4:00 AM
64
°
Clear
Feels like
59°
Humidity
50%
Wind
11 mph
Sunrise
5:21 AM
Sunset
8:01 PM
Waltham, MA
Hour by hour · 24h
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
49°
10p
47°
11p
Waltham, MA
7-day forecast
- TodayMay 17Overcast15%88°60°
- MondayMay 18Overcast—71°57°
- TuesdayMay 19Rain17%96°61°
- WednesdayMay 20Showers73%93°61°
- ThursdayMay 21Overcast13%67°53°
- FridayMay 22Overcast—72°51°
- SaturdayMay 23Drizzle15%54°49°
Waltham, MA
Next 24 hours · Cool now
Waltham, MA
Anemometer · 24h winds · from true
From · True
SSW
197° · backing 39°
Direction
SSW
197°
Sustained
11
mph
Gust
28
mph
Peak 24h
31
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
61
AQI
Moderate
- PM 2.5
- 10.1 μg/m³
- PM 10
- 13.4 μg/m³
- NO₂
- 8.2 μg/m³
- Ozone
- 96.0 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
5:21 AM
Daylight
14h 40m
Sunset
8:01 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: 5°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).