St. James, New York Weather
Fireflies rise from the lawn. Day 77 of spring. Read this microseason across nine climate regions →
St. James weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Clear——81°56°—
- ThursdayJun 4Overcast——84°57°+3°
- FridayJun 5Overcast——89°56°+5°
- SaturdayJun 6Overcast45%—90°68°+1°
- SundayJun 7Drizzle52%0.01″87°66°-3°
- MondayJun 8Overcast17%—77°58°-10°
- TuesdayJun 9Overcast——86°59°+9°
Ozone at AQI 500 now. AQI up 24 in the last 6 hours — air quality is degrading. With UV 0.0 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 120 by mid-afternoon.
AVOID OUTDOORS Avoid outdoor exertion. Keep windows closed; use HEPA filtration indoors if available.
What's driving it
Ozone × UV × Sky
Ozone at AQI 500 now. With UV 0.0 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 120 by mid-afternoon.
- Present
- AQI 500
- UV peak
- 0.0 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 120
PM × Wind × Precip
PM2.5 at 9.6 µg/m³, PM10 at 13.0 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.74
- Wind
- light
- 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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 3:23 AM
- Moonset
- 12:49 PM
- In sign
- ♑︎ Capricorn
Fireflies rise from the lawn
St. James at a glance
- Today vs. normal: 13°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 4, 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
St. James's warmest month is July (~75°F mean) and its coldest is January (~32°F). Rainfall peaks in December (4.7 inches) and bottoms out in July (3.3 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 32° | 3.7″ | 7 |
| February | 33° | 3.3″ | 6 |
| March | 40° | 4.5″ | 7 |
| April | 50° | 4.1″ | 7 |
| May | 60° | 3.3″ | 7 |
| June | 69° | 4.0″ | 6 |
| July | 75° | 3.3″ | 6 |
| August | 74° | 4.2″ | 6 |
| September | 67° | 3.6″ | 6 |
| October | 56° | 4.0″ | 6 |
| November | 46° | 3.4″ | 6 |
| December | 37° | 4.7″ | 8 |
Regional context
St. James's baseline climate, derived from NOAA NCEI 1991-2020 normals at the nearest reporting station, swings from a January mean of 32°F to a July mean of 75°F — a 43°F seasonal arc typical of the mid-latitude bands. Annual precipitation runs about 46 inches spread across roughly 76 days with measurable rain or snow each year.
Rainfall stays relatively even across the calendar: December tops out at 4.7 inches across 7.8 days with measurable rain, and July settles around 3.3 inches across 5.5 rainy days — a comparatively narrow seasonal range. The temperate, evenly-distributed pattern groups St. James with places like Head of the Harbor, NY, Nesconset, NY and Lake Grove, NY, where seasonal storm tracks deliver moisture more uniformly than the continental interior.
The frost-sensitive growing window opens around mid-April, when overnight lows reliably clear freezing for cool-season crops like peas, lettuce, spinach, and radishes. Warm-season transplants — tomatoes, peppers, and basil — typically wait two weeks past that date to avoid late spring cold snaps. The window closes around mid-November, when overnight lows resume dipping below freezing and frost-tender plants need protection or harvest. Those dates are 30-year averages; the actual frost-free window in a given year can vary by 10-14 days at either end. Neighborhood-scale variation in elevation and cold-air pooling means the practical last-frost date inside St. James can lag the regional mean by 5-10 days in low spots, and a bench position with good cold-air drainage can run a week ahead.
Similar climates: Head of the Harbor, NY, Nesconset, NY, Lake Grove, NY, Village of the Branch, NY, Stony Brook, NY.
Frequently asked
- When does it freeze in St. James?
- St. James's last spring frost typically falls around mid-April, and the first fall frost arrives around mid-November.
- What is the rainy season in St. James?
- December is the wettest month with about 4.7 inches of rain on average; the city receives roughly 46 inches annually.
- What is the warmest month in St. James?
- July is typically warmest, averaging about 75°F.
- What is the coldest month in St. James?
- January is typically coldest, averaging about 32°F.
- When can I start a vegetable garden in St. James?
- 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 St. James get?
- St. James averages about 76 rainy days per year.
- What hardiness zone is St. James?
- St. James'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
St. James, New York sits in a warm-summer humid continental climate zone. January means hover near 32°F while July averages 75°F — a 43°F seasonal swing.
Across the year, St. James receives about 46 inches of precipitation spread over roughly 76 rainy days.
The rhythm of the year is set by latitude (40.9°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 St. James
- Robert Moses Beach18.5 mi
- Jones Beach Beach26.9 mi
Each linked page shows live water temperature, wave height, swim and surf verdicts, tides, and rip-current risk from NDBC + NOAA + NWS data.