Gretna in Fall
In fall (September, October and November), Gretna sees average daytime highs around 77°F and overnight lows near 65°F, with 11.6 in of rain over about 28 wet days across the season. It is the 2nd-warmest season and the driest season of the year.
Over the season highs ease from about 86°F in early September to 66°F by late November. The sky is clear or mostly clear about 48% of the time across fall, and the air most often feels oppressive.
Fall is Gretna's 2nd-best season to visit on our travel score. For the whole year in context, see Gretna's year-round climate.
- Avg daytime high
- 77°F
- 2nd-warmest season
- Avg overnight low
- 65°F
- Rainfall
- 11.6 in
- 28 wet days
- Avg wind
- 8 mph
- Travel score
- 6.5
- 2nd-best season
- Months
- Sep · Oct · Nov
Temperature in Gretna in Fall
Over the season highs ease from about 86°F in early September to 66°F by late November.
A typical fall day in Gretna reaches about 77°F and drops to 65°F overnight. The warmest of the three months is September, the coolest November.
How fall really feels in Gretna
Once humidity and wind are folded in, fall brings about 18 days that feel above 90°F and 0 that feel at or below 32°F.
The story in fall is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Gretna weather by month
How the three fall months (September, October and November) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 61° / 48° | 4.4 | 9.7 | 10.3 | 5.1 |
| Feb | 64° / 51° | 4.2 | 8.8 | 10.9 | 5.8 |
| Mar | 69° / 57° | 4.5 | 9.4 | 11.8 | 6.6 |
| Apr | 75° / 63° | 3.9 | 8.4 | 12.7 | 7.2 |
| May | 82° / 70° | 3.6 | 9.2 | 13.5 | 6.5 |
| Jun | 86° / 76° | 5.2 | 15.2 | 13.9 | 4.4 |
| Jul | 88° / 78° | 5.6 | 17.9 | 13.7 | 3.7 |
| Aug | 87° / 78° | 6.3 | 17.4 | 13.1 | 3.8 |
| Sep | 84° / 74° | 4.9 | 12.8 | 12.2 | 5.2 |
| Oct | 77° / 65° | 3.5 | 8 | 11.3 | 7.4 |
| Nov | 69° / 56° | 3.3 | 7.3 | 10.5 | 7.0 |
| Dec | 63° / 51° | 3.8 | 9.2 | 10.1 | 5.7 |
Cloud cover in Fall
The sky is clear or mostly clear about 48% of the time across fall.
Chance of precipitation in Fall
Gretna gets around 11.6 in of rain over 28 wet days across fall. The line is the day-by-day chance of measurable precipitation.
Humidity in Fall
Most of fall feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Fall
Winds average 8 mph across fall.
Sunrise & sunset in Fall
Daylight runs from about 12 h 36 min in early September to 10 h 12 min by late November. The lit band spans sunrise to sunset each day.
Solar energy in Fall
Average shortwave solar energy reaching the ground each day across fall, about 4.2 kWh/m².
Hazard calendar for Gretna
In fall, Gretna overlaps its atlantic hurricane season. The full year is below, with each hazard's peak months called out.
Gretna sits in the Atlantic hurricane belt; the season peaks August–October.
Is fall a good time to visit Gretna?
Our two travel scores rate fall for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
fall is a reasonable time to visit Gretna for sightseeing.
What to pack for Gretna in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Gretna sees daytime highs around 77°F and nights near 65°F. Pack light clothes. Worth having: rain gear and sun protection. About 28 days see rain.
Sea temperature near Gretna in Fall
The nearest coast averages about 75°F across fall — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 15 mi away) is warmest in August at about 86°F and coldest in January near 58°F.
It's comfortable for a long swim from Apr 5 to Nov 13 — about 7.3 months when the water holds above 68°F.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 58 | 58 | 64 | 71 | 78 | 84 | 86 | 86 | 83 | 76 | 67 | 61 |
| Comfort | Bracing | Bracing | Cool | Refreshing | Warm | Tropical | Tropical | Tropical | Tropical | Warm | Cool | Cool |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 58 | Bracing |
| Feb | 58 | Bracing |
| Mar | 64 | Cool |
| Apr | 71 | Refreshing |
| May | 78 | Warm |
| Jun | 84 | Tropical |
| Jul | 86 | Tropical |
| Aug | 86 | Tropical |
| Sep | 83 | Tropical |
| Oct | 76 | Warm |
| Nov | 67 | Cool |
| Dec | 61 | Cool |
UV index in Gretna in Fall
Clear-sky midday UV across fall averages around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Gretna peaks around July 11 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 4 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 4 | 6 | 7 | 10 | 10 | 10 | 10 | 9 | 8 | 6 | 5 | 4 |
| Level | Moderate | High | High | Very high | Very high | Extreme | Extreme | Very high | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 4 | Moderate |
| Feb | 6 | High |
| Mar | 7 | High |
| Apr | 10 | Very high |
| May | 10 | Very high |
| Jun | 10 | Extreme |
| Jul | 10 | Extreme |
| Aug | 9 | Very high |
| Sep | 8 | Very high |
| Oct | 6 | High |
| Nov | 5 | Moderate |
| Dec | 4 | Moderate |
Air quality in Gretna in Fall
Average fine-particle pollution (PM2.5) through the year — so you can see where fall falls, not just the annual average.
Air quality in Gretna is worst in July — around 22 µg/m³ PM2.5 (moderate), about 2.9× the cleanest month (November, 8 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 8 | 9 | 10 | 10 | 13 | 18 | 22 | 17 | 11 | 8 | 8 | 8 |
| Level | Good | Good | Good | Good | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 8 | Good |
| Feb | 9 | Good |
| Mar | 10 | Good |
| Apr | 10 | Good |
| May | 13 | Moderate |
| Jun | 18 | Moderate |
| Jul | 22 | Moderate |
| Aug | 17 | Moderate |
| Sep | 11 | Good |
| Oct | 8 | Good |
| Nov | 8 | Good |
| Dec | 8 | Good |
Where is Gretna?
Gretna sits at 29.9°N, 90.1°W, 0 ft above sea level, in United States. The nearest listed city is Terrytown, 1.2 mi away.
Topography around Gretna
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Gretna.
Within 2 miles, the terrain around Gretna has only modest variations in elevation — a maximum elevation change of 89 ft around an average of 3 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 141 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 243 ft.
The land around Gretna is covered by artificial surfaces (56%) and grassland (20%) within 2 miles, artificial surfaces (29%) and trees (27%) within 10 miles, and water (41%) and trees (28%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Gretna (29.9147°, -90.054°, elevation 0 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.