Roslyn Harbor, New York Weather
Fireflies rise from the lawn. Day 76 of spring. Read this microseason across nine climate regions →
Roslyn Harbor weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Clear——82°56°—
- ThursdayJun 4Overcast——87°59°+5°
- FridayJun 5Overcast——88°61°+1°
- SaturdayJun 6Overcast23%—92°72°+4°
- SundayJun 7Showers72%0.42″79°59°-13°
- MondayJun 8Light Drizzle45%0.01″78°57°-1°
- TuesdayJun 9Overcast14%—86°62°+8°
Ozone at AQI 70 now. AQI up 9 over the last 6 hours (gradual rise). With UV 0.2 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 17 by mid-afternoon.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 70 now. With UV 0.2 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 17 by mid-afternoon.
- Present
- AQI 70
- UV peak
- 0.2 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 17
PM × Wind × Precip
PM2.5 at 10.4 µg/m³, PM10 at 12.3 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.85
- Wind
- breezy
- Recent rain
- 0h in last 6h
- Pattern
- background
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
The higher the clouds, the finer the weather.
- Moonrise
- 2:48 AM
- Moonset
- 11:47 AM
- In sign
- ♑︎ Capricorn
Fireflies rise from the lawn
Roslyn Harbor at a glance
- Today vs. normal: 3°F below the seasonal normal for this latitude
- Last frost: April 21 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 3, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | — | — |
| February | — | — |
| March | — | — |
| April | lettuce, peas, spinach, radishes | — |
| May | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| July | tomatoes, peppers, beans, squash | tomatoes, beans, summer squash |
| August | — | tomatoes, beans, summer squash |
| September | fall brassicas, garlic (overwinter), carrots | tomatoes, beans, summer squash |
| October | fall brassicas, garlic (overwinter), carrots | winter squash, tomatoes (last) |
| November | — | — |
| December | — | — |
A year in weather
Roslyn Harbor's warmest month is July (~79°F mean) and its coldest is January (~34°F). Rainfall peaks in August (4.4 inches) and bottoms out in February (2.9 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 34° | 3.3″ | 6 |
| February | 36° | 2.9″ | 6 |
| March | 43° | 4.0″ | 7 |
| April | 54° | 3.9″ | 6 |
| May | 64° | 3.6″ | 7 |
| June | 73° | 4.0″ | 7 |
| July | 79° | 4.3″ | 6 |
| August | 78° | 4.4″ | 6 |
| September | 71° | 3.9″ | 6 |
| October | 60° | 3.8″ | 5 |
| November | 49° | 3.1″ | 6 |
| December | 40° | 4.1″ | 7 |
Frequently asked
- When does it freeze in Roslyn Harbor?
- Roslyn Harbor's last spring frost typically falls around mid-April, and the first fall frost arrives around mid-November.
- What is the rainy season in Roslyn Harbor?
- August is the wettest month with about 4.4 inches of rain on average; the city receives roughly 45 inches annually.
- What is the warmest month in Roslyn Harbor?
- July is typically warmest, averaging about 79°F.
- What is the coldest month in Roslyn Harbor?
- January is typically coldest, averaging about 34°F.
- When can I start a vegetable garden in Roslyn Harbor?
- Cool-season crops (peas, lettuce) can be sown around the last spring frost (mid-April); warm-season crops (tomatoes, peppers) wait until 1–2 weeks after.
- How many rainy days does Roslyn Harbor get?
- Roslyn Harbor averages about 75 rainy days per year.
- What hardiness zone is Roslyn Harbor?
- Roslyn Harbor's USDA hardiness zone is determined by its lowest average winter temperature; check the USDA's online lookup with the city ZIP for the current zone designation.
Climate
Roslyn Harbor, New York sits in a warm-summer humid continental climate zone. January means hover near 34°F while July averages 79°F — a 45°F seasonal swing.
Across the year, Roslyn Harbor receives about 45 inches of precipitation spread over roughly 75 rainy days.
The rhythm of the year is set by latitude (40.8°N), proximity to large water bodies, and elevation — all of which shape what grows here, when frost is likely, and what the weather story looks like day to day.
Beaches near Roslyn Harbor
- Long Beach NY Beach15.7 mi
- Jones Beach Beach16.8 mi
- Rockaway Beach Beach19.1 mi
Each linked page shows live water temperature, wave height, swim and surf verdicts, tides, and rip-current risk from NDBC + NOAA + NWS data.