Gretna, Louisiana Weather
Fireflies pulse through the magnolias. Day 77 of spring. Read this microseason across nine climate regions →
Gretna weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Heavy Showers22%0.89″81°71°—
- FridayJun 5Drizzle79%0.03″85°71°+4°
- SaturdayJun 6Heavy Drizzle74%—86°75°+1°
- SundayJun 7Light Showers47%—87°75°+1°
- MondayJun 8Overcast16%—92°75°+5°
- TuesdayJun 9Overcast25%—93°75°+1°
- WednesdayJun 10Mostly Clear35%—93°77°0°
PM2.5 at 12.4 µg/m³, PM10 at 17.7 µg/m³ — typical background levels with no transport signature. AQI flat over the last 6 hours (within ±3 points).
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 49. Overcast through the UV peak window (cloud cover ~89%) — afternoon ozone should stay flat.
- Present
- AQI 49
- UV peak
- 3.3 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 11
PM × Wind × Precip
PM2.5 at 12.4 µg/m³, PM10 at 17.7 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.70
- Wind
- light
- Recent rain
- 1h 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
- 4:00 AM
- Moonset
- 2:29 PM
- In sign
- ♑︎ Capricorn
Fireflies pulse through the magnolias
Gretna at a glance
- Today vs. normal: 11°F below the seasonal normal for this latitude
- Last frost: February 14 (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.
SPC Convective Outlook
Storm Prediction Center — Gretna
SPC has placed Gretna in the General Thunderstorms category for severe thunderstorms today.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3TSTMGeneral Thunderstorms
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | — | — |
| February | lettuce, peas, spinach, radishes | — |
| March | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | — |
| April | tomatoes, peppers, beans, squash | — |
| May | tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| June | — | 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
Gretna's warmest month is August (~85°F mean) and its coldest is January (~54°F). Rainfall peaks in August (6.5 inches) and bottoms out in November (3.6 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 54° | 5.3″ | 6 |
| February | 58° | 4.1″ | 6 |
| March | 64° | 4.6″ | 5 |
| April | 71° | 5.9″ | 5 |
| May | 78° | 4.9″ | 5 |
| June | 83° | 6.0″ | 9 |
| July | 84° | 6.3″ | 10 |
| August | 85° | 6.5″ | 8 |
| September | 81° | 4.6″ | 6 |
| October | 73° | 3.6″ | 5 |
| November | 63° | 3.6″ | 4 |
| December | 56° | 4.6″ | 6 |
Regional context
Gretna sits within a humid subtropical climate region — a cohort that shares similar temperature ranges, seasonal patterns, and growing conditions across nearby cities.
Similar climates: New Orleans, LA, Baton Rouge, LA, Shreveport, LA, Lafayette, LA, Lake Charles, LA.
Frequently asked
- When does it freeze in Gretna?
- Gretna's last spring frost typically falls around mid-February, and the first fall frost arrives around mid-December.
- What is the rainy season in Gretna?
- August is the wettest month with about 6.5 inches of rain on average; the city receives roughly 60 inches annually.
- What is the warmest month in Gretna?
- August is typically warmest, averaging about 85°F.
- What is the coldest month in Gretna?
- January is typically coldest, averaging about 54°F.
- When can I start a vegetable garden in Gretna?
- Cool-season crops (peas, lettuce) can be sown around the last spring frost (mid-February); warm-season crops (tomatoes, peppers) wait until 1–2 weeks after.
- How many rainy days does Gretna get?
- Gretna averages about 75 rainy days per year.
- What hardiness zone is Gretna?
- Gretna'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
Gretna, Louisiana sits in a humid subtropical climate zone. January means hover near 54°F while July averages 84°F — a 30°F seasonal swing.
Across the year, Gretna receives about 60 inches of precipitation spread over roughly 75 rainy days.
The rhythm of the year is set by latitude (29.9°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.