Slidell weather in January

In January, Slidell sees average daytime highs of 59°F and overnight lows near 47°F, with 4.5 in of rain across 9.3 wet days and about 10.3 hours of daylight. It is the 12th-warmest and 6th-wettest month of the year here.

Day-to-day highs hold fairly steady near 59°F through the month. The sky is clear or mostly clear about 36% of the time in January, and the air most often feels dry.

Daylight stretches from about 10 h 06 min at the start of January to 10 h 30 min by month's end. Set against the rest of the year, January is Slidell's 9th-clearest and 2nd-windiest month. For the whole year in context, see Slidell's year-round climate.

Daytime high
59°
12th warmest
Overnight low
47°
1st coldest
Rainfall
4.5 in
9.3 wet days
Daylight
10 h 12 min
7:01 AM – 5:16 PM
Cloud cover
56%
9th clearest
Wind
9 mph
2nd windiest
Solar energy
2.96 kWh/m²
Travel score
4.6
out of 10

Slidell is city in St. Tammany Parish, Louisiana, United States.

Density
32,119/km²
people per km²
Founded
1882

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 59°F through the month.

A typical January day in Slidell reaches about 59°F in the afternoon and slips back to 47°F overnight — a 11°F spread between the day's warmth and the night's chill. On most days the high lands between 48°F and 68°F. Set against its neighbours, January runs about 2°F cooler than December and about 3°F cooler than February.

30°40°50°60°70°80°151015202531
Avg high (°F)Avg low (°F)
15948
25948
35848
45848
55847
65847
75847
85847
95847
105847
115847
125847
135847
145847
155847
165847
175847
185847
195847
205847
215947
225947
235947
245947
255947
265947
275948
285948
295948
305948
315948

How January really feels in Slidell

Once humidity and wind are folded in, January averages 0 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F
0
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

January sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Slidell weather by month

How January compares with the rest of the year at a glance. January is the 12th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan59° / 47°4.59.310.34.6
Feb62° / 51°4.48.710.95.4
Mar67° / 56°4.89.211.86.5
Apr73° / 63°3.88.712.77.1
May80° / 71°3.59.913.56.8
Jun85° / 76°4.91513.94.7
Jul87° / 78°5.118.113.84.0
Aug87° / 78°5.917.913.14.0
Sep83° / 74°4.712.512.25.5
Oct76° / 65°3.47.611.37.5
Nov67° / 55°3.3710.56.9
Dec61° / 50°4.09.110.15.2

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 36% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 12% of January, with mostly cloudy or overcast conditions the remaining 52%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14357
24357
34456
44456
54555
64654
74555
84654
94753
104951
114951
124951
135050
145050
155149
165149
175149
185149
195149
205050
215050
225050
235050
244951
254951
264951
274852
284753
294753
304753
314852

Chance of precipitation in January

Any precipitation

Slidell gets around 4.5 in of rain over 9.3 wet days in January. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 30% and peaks near 31% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
131
231
331
431
531
631
731
831
930
1030
1130
1230
1330
1430
1530
1629
1729
1829
1929
2029
2129
2229
2330
2430
2530
2630
2731
2831
2931
3031
3131

Humidity in January

DryComfortableHumidMuggyOppressiveMiserable

Most of January feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, January lands in the dry band about 75% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
171131231
272131230
372131230
471141230
571141230
672131230
772131230
873131130
973131130
1073131130
1174131030
1274131030
1374131030
147513930
157513930
167613830
177613830
187713730
197713730
207813630
217813630
227813630
237813630
247913530
257913530
267813630
277813630
287813630
297813630
307813630
317912630

Wind in January

Winds average 9 mph in January.

Across January, daily wind ranges from about 9 mph on the calmest days to 9 mph at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (mph)Feels
19light breeze
29light breeze
39light breeze
49light breeze
59light breeze
69light breeze
79light breeze
89light breeze
99light breeze
109light breeze
119light breeze
129light breeze
139light breeze
149light breeze
159light breeze
169light breeze
179light breeze
189light breeze
199light breeze
209light breeze
219light breeze
229light breeze
239light breeze
249light breeze
259light breeze
269light breeze
279light breeze
289light breeze
299light breeze
309light breeze
319light breeze

Sunrise & sunset in January

DaylightNight

Daylight runs from about 10 h 06 min at the start of January to 10 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 24 minutes over January. Sunrise moves from 7:00 AM to 6:56 AM, and sunset from 5:05 PM to 5:28 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
110.17:005:05
210.17:005:05
310.17:005:06
410.17:015:07
510.17:015:07
610.17:015:08
710.17:015:09
810.17:015:10
910.27:015:10
1010.27:015:11
1110.27:015:12
1210.27:015:13
1310.27:015:13
1410.27:015:14
1510.27:015:15
1610.27:015:16
1710.37:015:17
1810.37:015:17
1910.37:015:18
2010.37:005:19
2110.37:005:20
2210.37:005:21
2310.47:005:22
2410.46:595:22
2510.46:595:23
2610.46:595:24
2710.46:585:25
2810.56:585:26
2910.56:575:27
3010.56:575:28
3110.56:565:28

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 2.96 kWh/m².

For context, solar energy here swings from a low near 2.72 kWh/m² to a high of 6.27 kWh/m² in May across the year — January's 2.96 kWh/m² sits near the bottom.

01234151015202531
Solar energy (kWh/m²)Level
12.7Moderate
22.7Moderate
32.7Moderate
42.7Moderate
52.7Moderate
62.8Moderate
72.8Moderate
82.8Moderate
92.8Moderate
102.8Moderate
112.9Moderate
122.9Moderate
132.9Moderate
142.9Moderate
153.0Moderate
163.0Moderate
173.0Moderate
183.0Moderate
193.0Moderate
203.1Moderate
213.1Moderate
223.1Moderate
233.1Moderate
243.1Moderate
253.1Moderate
263.2Moderate
273.2Moderate
283.2Moderate
293.2Moderate
303.2Moderate
313.3Moderate
Planning a trip in January

Hazard calendar for Slidell

In seasonPeak

None of Slidell's seasonal hazards are active in January. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Slidell sits in the Atlantic hurricane belt; the season peaks August–October.

Atlantic hurricane
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is January a good time to visit Slidell?

Our two travel scores rate January for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

4.6
Sightseeing
10th-best month of the year
0.0
Beach & pool
12th-best month of the year

January is a reasonable time to visit Slidell for sightseeing.

What to pack for Slidell in January

From January's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In January, Slidell sees daytime highs around 59°F and nights near 47°F. Worth packing: a warm layer and rain gear. About 9 days see rain.

a warm layerrain gear

Sea temperature near Slidell in January

The nearest coast averages about 57°F in January — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 12 mi away) is warmest in August at about 86°F and coldest in January near 57°F.

It's comfortable for a long swim from Apr 5 to Nov 10 — about 7.2 months when the water holds above 68°F.

50°60°70°80°90°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°F)Comfort
Jan57Bracing
Feb58Bracing
Mar64Cool
Apr71Refreshing
May78Warm
Jun84Tropical
Jul86Tropical
Aug86Tropical
Sep83Tropical
Oct75Warm
Nov67Cool
Dec60Cool

UV index in Slidell in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Slidell peaks around July 12 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highVery highHighModerateJul 12UV 10Dec 19UV 4
UV index (midday)Level
Jan4Moderate
Feb6High
Mar6High
Apr10Very high
May10Very high
Jun10Very high
Jul10Extreme
Aug9Very high
Sep8Very high
Oct6High
Nov5Moderate
Dec4Moderate

Air quality in Slidell in January

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where January falls, not just the annual average.

Air quality in Slidell 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).

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1621 µg/m³Nov 238 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb9Good
Mar10Good
Apr10Good
May13Moderate
Jun18Moderate
Jul22Moderate
Aug17Moderate
Sep11Good
Oct8Good
Nov8Good
Dec8Good
Location & terrain

Where is Slidell?

Slidell sits at 30.3°N, 89.8°W, 3 ft above sea level, in United States. The nearest listed city is Chalmette, 25 mi away.

Topography around Slidell

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Slidell.

Within 2 miles, the terrain around Slidell has only modest variations in elevation — a maximum elevation change of 62 ft around an average of 16 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 118 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 423 ft.

The land around Slidell is covered by trees (56%) and artificial surfaces (25%) within 2 miles, trees (52%) and water (26%) within 10 miles, and trees (44%) and water (34%) within 50 miles.

2 miles
62 ft
10 miles
118 ft
50 miles
423 ft
treesgrasslandartificial surfacesbare terrainwaterwetland
January weather nearby: Chalmette 25 mi · New Orleans 28 mi · Terrytown 29 mi · Gretna 30 mi · Metairie 30 mi · Metairie Terrace 30 mi · Harvey 31 mi · Marrero 32 mi

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
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

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 Slidell (30.2752°, -89.7812°, elevation 3 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).