Swannanoa, North Carolina Weather
Fireflies pulse through the magnolias. Day 76 of spring. Read this microseason across nine climate regions →
Swannanoa weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Foggy——73°50°—
- ThursdayJun 4Clear——79°57°+6°
- FridayJun 5Overcast——84°61°+5°
- SaturdayJun 6Overcast——84°60°0°
- SundayJun 7Overcast19%—84°61°0°
- MondayJun 8Overcast64%—78°63°-6°
- TuesdayJun 9Overcast27%—75°59°-3°
Ozone at AQI 39 now. AQI up 6 over the last 6 hours (gradual rise). With UV 0.4 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 9 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 39 now. With UV 0.4 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 9 by mid-afternoon.
- Present
- AQI 39
- UV peak
- 0.4 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 9
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
- 3:04 AM
- Moonset
- 12:42 PM
- In sign
- ♑︎ Capricorn
Fireflies pulse through the magnolias
Swannanoa at a glance
- Today vs. normal: 8°F below the seasonal normal for this latitude
- Last frost: March 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 | lettuce, peas, spinach, radishes | — |
| April | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | — |
| May | tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| July | — | tomatoes, beans, summer squash |
| August | — | tomatoes, beans, summer squash |
| September | — | tomatoes, beans, summer squash |
| October | fall brassicas, garlic (overwinter), carrots | winter squash, tomatoes (last) |
| November | fall brassicas, garlic (overwinter), carrots | — |
| December | — | — |
A year in weather
Swannanoa's warmest month is July (~75°F mean) and its coldest is January (~38°F). Rainfall peaks in July (4.1 inches) and bottoms out in October (2.6 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 38° | 3.3″ | 6 |
| February | 42° | 2.9″ | 6 |
| March | 48° | 3.5″ | 7 |
| April | 57° | 3.7″ | 7 |
| May | 65° | 3.5″ | 7 |
| June | 72° | 3.4″ | 8 |
| July | 75° | 4.1″ | 8 |
| August | 74° | 3.6″ | 7 |
| September | 68° | 3.7″ | 6 |
| October | 58° | 2.6″ | 4 |
| November | 48° | 3.0″ | 5 |
| December | 41° | 3.3″ | 6 |
Regional context
Swannanoa sits within a humid subtropical climate region — a cohort that shares similar temperature ranges, seasonal patterns, and growing conditions across nearby cities.
Similar climates: Charlotte, NC, Raleigh, NC, Winston-Salem, NC, Durham, NC, Greensboro, NC.
Frequently asked
- When does it freeze in Swannanoa?
- Swannanoa's last spring frost typically falls around mid-March, and the first fall frost arrives around mid-December.
- What is the rainy season in Swannanoa?
- July is the wettest month with about 4.1 inches of rain on average; the city receives roughly 41 inches annually.
- What is the warmest month in Swannanoa?
- July is typically warmest, averaging about 75°F.
- What is the coldest month in Swannanoa?
- January is typically coldest, averaging about 38°F.
- When can I start a vegetable garden in Swannanoa?
- Cool-season crops (peas, lettuce) can be sown around the last spring frost (mid-March); warm-season crops (tomatoes, peppers) wait until 1–2 weeks after.
- How many rainy days does Swannanoa get?
- Swannanoa averages about 78 rainy days per year.
- What hardiness zone is Swannanoa?
- Swannanoa'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
Swannanoa, North Carolina sits in a humid subtropical climate zone. January means hover near 38°F while July averages 75°F — a 37°F seasonal swing.
Across the year, Swannanoa receives about 41 inches of precipitation spread over roughly 78 rainy days.
The rhythm of the year is set by latitude (35.6°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.