Cayce, South Carolina Weather
Fireflies pulse through the magnolias. Day 76 of spring. Read this microseason across nine climate regions →
Cayce weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Clear——81°56°—
- ThursdayJun 4Clear——86°57°+5°
- FridayJun 5Overcast——88°61°+2°
- SaturdayJun 6Overcast——88°65°0°
- SundayJun 7Overcast——92°68°+4°
- MondayJun 8Light Drizzle50%—94°71°+2°
- TuesdayJun 9Overcast35%—83°63°-11°
Ozone at AQI 66 — peak already passed at 1 PM under clear skies. AQI up 22 in the last 6 hours — air quality is degrading. Levels should ease through evening.
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 66 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
- Present
- AQI 66
- UV peak
- 1.1 at earlier today
- Sky at peak
- clear
- Projected peak
- AQI 66
PM × Wind × Precip
PM2.5 at 5.2 µg/m³, PM10 at 6.1 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.85
- 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).
The higher the clouds, the finer the weather.
- Moonrise
- 2:54 AM
- Moonset
- 12:42 PM
- In sign
- ♑︎ Capricorn
Fireflies pulse through the magnolias
Cayce at a glance
- Today vs. normal: 79°F — typical for the season
- Last frost: March 11 (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
Cayce's warmest month is July (~82°F mean) and its coldest is January (~45°F). Rainfall peaks in August (4.7 inches) and bottoms out in November (3.0 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 45° | 3.7″ | 7 |
| February | 48° | 3.6″ | 6 |
| March | 55° | 3.8″ | 6 |
| April | 63° | 3.2″ | 6 |
| May | 71° | 3.2″ | 6 |
| June | 78° | 4.4″ | 8 |
| July | 82° | 4.7″ | 8 |
| August | 80° | 4.7″ | 7 |
| September | 75° | 4.6″ | 6 |
| October | 64° | 3.2″ | 5 |
| November | 54° | 3.0″ | 4 |
| December | 48° | 4.1″ | 6 |
Regional context
Cayce sits within a humid subtropical climate region — a cohort that shares similar temperature ranges, seasonal patterns, and growing conditions across nearby cities.
Similar climates: Charleston, SC, Columbia, SC, Greenville, SC, Myrtle Beach, SC, Rock Hill, SC.
Frequently asked
- When does it freeze in Cayce?
- Cayce's last spring frost typically falls around mid-March, and the first fall frost arrives around mid-December.
- What is the rainy season in Cayce?
- August 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 Cayce?
- July is typically warmest, averaging about 82°F.
- What is the coldest month in Cayce?
- January is typically coldest, averaging about 45°F.
- When can I start a vegetable garden in Cayce?
- 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 Cayce get?
- Cayce averages about 75 rainy days per year.
- What hardiness zone is Cayce?
- Cayce'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
Cayce, South Carolina sits in a humid subtropical climate zone. January means hover near 45°F while July averages 82°F — a 37°F seasonal swing.
Across the year, Cayce receives about 46 inches of precipitation spread over roughly 75 rainy days.
The rhythm of the year is set by latitude (33.9°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.