Weather in Simpsonville, South Carolina
Roses open on the Piedmont edge. Day 59 of spring. Read this microseason across nine climate regions →
- TodayMay 17Overcast—88°62°
- MondayMay 18Partly Cloudy—90°67°
- TuesdayMay 19Overcast—88°61°
- WednesdayMay 20Light Showers18%90°63°
- ThursdayMay 21Drizzle73%87°64°
- FridayMay 22Light Drizzle73%74°63°
- SaturdayMay 23Overcast67%83°62°
- PM 2.5
- 19.4 μg/m³
- PM 10
- 20.8 μg/m³
- NO₂
- 8.7 μg/m³
- Ozone
- 72.0 μg/m³
- UV Index
- 0.0 Low
When the dew is on the grass, rain will never come to pass.
- Moonrise
- 10:36 AM
- Moonset
- 12:49 AM
- In sign
- ♊︎ Gemini
Roses open on the Piedmont edge
Simpsonville at a glance
- Today vs. normal: 9°F below the seasonal normal for this latitude
- Last frost: March 15 (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
Peak growing season
As of May 17, 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
Simpsonville's warmest month is July (~78°F mean) and its coldest is January (~41°F). Rainfall peaks in December (5.1 inches) and bottoms out in February (3.5 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 41° | 4.4″ | 6 |
| February | 44° | 3.5″ | 6 |
| March | 51° | 4.3″ | 6 |
| April | 60° | 4.2″ | 7 |
| May | 67° | 3.8″ | 6 |
| June | 74° | 4.4″ | 7 |
| July | 78° | 4.6″ | 7 |
| August | 77° | 4.4″ | 6 |
| September | 71° | 4.0″ | 6 |
| October | 60° | 3.9″ | 5 |
| November | 50° | 4.0″ | 6 |
| December | 43° | 5.1″ | 6 |
Regional context
Simpsonville 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 Simpsonville?
- Simpsonville's last spring frost typically falls around mid-March, and the first fall frost arrives around mid-December.
- What is the rainy season in Simpsonville?
- December is the wettest month with about 5.1 inches of rain on average; the city receives roughly 51 inches annually.
- What is the warmest month in Simpsonville?
- July is typically warmest, averaging about 78°F.
- What is the coldest month in Simpsonville?
- January is typically coldest, averaging about 41°F.
- When can I start a vegetable garden in Simpsonville?
- 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 Simpsonville get?
- Simpsonville averages about 74 rainy days per year.
- What hardiness zone is Simpsonville?
- Simpsonville'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
Simpsonville, South Carolina sits in a humid subtropical climate zone. January means hover near 41°F while July averages 78°F — a 37°F seasonal swing.
Across the year, Simpsonville receives about 51 inches of precipitation spread over roughly 74 rainy days.
The rhythm of the year is set by latitude (34.7°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.