Climate and monthly weather forecastSlidell, LA
Climate and monthly weather forecast
The climate of Slidell
The climate of Slidell, Louisiana, falls under the Cfa category according to the Köppen climate classification. This classification corresponds to an overall humid subtropical climate where there is no dry season, pertained to southern United States and mostly along its Gulf Coast. A weather pattern that is characterized by hot and humid summer and mild to cool winter prevails in Slidell.Throughout the year, the climate in Slidell fluctuates noticeably, with temperatures ranging from 45.1°F (7.3°C) to 90.9°F (32.7°C). July and August are the warmest months, with the average high temperature hovering around 90°F (32.2°C). On the other hand, from December to February, the city experiences its lowest temperatures, going down to about 45.1°F (7.3°C).
It's worth noting that Slidell gets a wet season, particularly in summer, marked by significantly high rainfall. The maximum amount that the city receives is from 4.41" (112mm) to 4.92" (125mm) between July and August. Rainfall is relatively less from November to March, with February being the driest month receiving just around 1.5" (38mm).
The Best Time to Visit Slidell
Considering the climate profile, the time between March and May is deemed the most propitious for visitation. During this period, the weather remains pleasantly warm with temperatures fluctuating between 64°F (17.8°C) and 83.8°F (28.8°C). Rainfall is relatively moderate in spring, ranging from 1.61" (41mm) to 2.68" (68mm), making it ideal for outdoor activities.The Worst Time to Visit Slidell
June through September might be less desirable for tourists due to considerably hot and humid conditions. Moreover, July and August experience high precipitation levels, reaching up to 4.92" (125mm), affecting outdoor activities.Spring Weather in Slidell
In Slidell, spring runs from March to May. It is a period of comfortable temperatures, with highs ranging from 64°F (17.8°C) to 83.8°F (28.8°C). Relative humidity in spring stays about 74% to 75%. Rainfall ranges from 1.61" (41mm) to 2.68" (68mm), and the sun shines approximately between 7.9 hours to 10.6 hours a day.Summer Weather in Slidell
During summer, ranging from June to August, Slidell observes some of its highest temperatures, soaring up to 90°F (32.2°C). Humidity also remains high at around 73% to 74% during this period. Rainfall reaches its peak, oscillating between 2.99" (76mm) and 4.92" (125mm). On average, sunlight persists for around 10.6 to 11.1 hours daily.Autumn Weather in Slidell
Autumn, from September to November, sees a gradual relief from the summer heat. Temperatures during this period drop to a more comfortable range, from 68.4°F (20.2°C) to 87.3°F (30.7°C). Rainfall tends to significantly decrease, with levels falling from 2.4" (61mm) in September to 1.5" (38mm) by November. Daily sunshine hours also reduce, from 10.3 hours to about 6.1 hours by the end of autumn.Winter Weather in Slidell
Winter in Slidell, which spans from December to February, is marked by the coolest temperatures of the year. The average high ranges from 59.4°F (15.2°C) to 70.7°F (21.5°C), while the lowest temperature hits around 49.5°F (9.7°C) in December. Despite the cool temperatures, Slidell experiences little to no snowfall during winter, with precipitation primarily occurring in the form of rain, fluctuating from 1.73" (44mm) to 2.68" (68mm). These months receive the least amount of sunshine: around 5.1 hours to 5.7 hours per day.Weather in January
The start of the year in Slidell, Louisiana brings about mild yet humid conditions. Winters here are known for relatively mild temperatures, with January's average high reaching up to 59.4°F (15.2°C) and average lows around 45.1°F (7.3°C). Weather in January »Weather in February
Light intensifies as daylight hours start to increase gradually from January, marking the slow transition from winter to spring. Compared to January, the average high temperature rises slightly to 64°F (17.8°C), and the average low to 49.8°F (9.9°C), signaling the onset of warmer days. Weather in February »Weather in March
The transformation from winter to spring becomes apparent in March, with average maximum temperatures hitting 70.7°F (21.5°C) and a significant increase in sunshine hours. Despite an increase in daylight, there's a slight rise in rainfalls, with March seeing 1.61" (41mm) of precipitation over 13 days. Weather in March »Weather in April
April stands out in Slidell, Louisiana, as it brings about a marked increase in sun exposure and a continued rise in temperature. There's a clear shift towards a more summery climate with the average maximum temperature now touching 77.4°F (25.2°C). Weather in April »Weather in May
Towards the end of spring, May is a month characterized by warm and slightly humid weather. There's a significant jump in temperature from April to May, as the maximum average temperature reaches a sizzling 83.8°F (28.8°C). This rise in temperature signals the early arrival of summer. Weather in May »Weather in June
June represents the official commencement of summer in Slidell, Louisiana, with temperature averages soaring up to a high of 90°F (32.2°C) while humidity remains steady at 73%. An escalated level of sunlight with 14.1 daylight hours adds to warmer climate conditions. Weather in June »Weather in July
July continues the summer rhythm, proceeding to be one of the warmest months in Slidell, Louisiana. However, the highest temperature for the year prevails during this month, with the mercury touching a high of 90.9°F (32.7°C). Despite the heat, July does not miss out on rain, with cumulatively the most substantial rainfall experienced over the year. Weather in July »Weather in August
The warmth continues into August, with practically no change from the high temperatures of July. From a climatological perspective, it's intriguing to observe that despite the slight dip in average high temperatures to 90.7°F (32.6°C), the average low increases to 77.4°F (25.2°C). Weather in August »Weather in September
September in Slidell, Louisiana, comes with a slight relief from high temperatures. The average high temperature drops to 87.3°F (30.7°C), indicating the descent into fall. Though the temperature starts to cool down, humidity remains high at 75%. Weather in September »Weather in October
October experiences more drastic changes in Slidell, Louisiana, signaling the heart of fall. Specifically, the drop in temperature from September is quite noticeable, with average highs reducing to 79.3°F (26.3°C). A drop in humidity down to 70% implies drier air, making the weather more comfortable. Weather in October »Weather in November
Slidell, Louisiana, in November observes cooler temperatures and crisp nights. The average high temperature further recoils to 68.4°F (20.2°C) while the visible sun falls to 10.6 hours per day. Decreasing temperatures, lowering rainfall, and lesser sunshine hours depicts a smooth transition into winters. Weather in November »Weather in December
December concludes the year in Slidell, Louisiana, with a cold snap. The average high temperature cools down to 62.1°F (16.7°C), indicating the arrival of winter. It is noteworthy that Slidell experiences 6 miles of visibility consistently throughout the year, indicating a relatively clear environment. Weather in December »Updated: Jul 8, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
January, recording an average high temperature of 59.4°F (15.2°C) and a low temperature of 45.1°F (7.3°C), is Slidell's coldest month.
In Slidell, Louisiana, during the entire year, the rain falls for 173.3 days and collects up to 30.79" (782mm) of precipitation.
The only month with snowfall is January.
January is the month with the most snowfall in Slidell. Snow falls for 0.3 days and accumulates 0.2" (5mm) of snow.
In Slidell, during the entire year, snow falls for 0.6 days and aggregates up to 0.2" (5mm) of snow.
In Slidell, snow does not fall in February through December.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from CDT to CST.
The months with the highest UV index are May through August, with an average maximum UV index of 7.
With an average of 14h and 6min of daylight, June has the longest days of the year.
The month with the most sunshine is June, with an average of 11.1h of sunshine.
In Slidell, Louisiana, the average highest temperatures are observed in July, with a high of 90.9°F (32.7°C) and a low of 77°F (25°C).
August is the month with the most rainfall. Rain falls for 23.5 days and accumulates 4.92" (125mm) of precipitation.
With an average relative humidity of 70%, October is the least humid month.
November is the month with the least rainfall in Slidell. Rain falls for 8 days and accumulates 1.5" (38mm) of precipitation.
The most humid month in Slidell is December, with an average relative humidity of 79%.
The month with the shortest days in Slidell is December, with an average of 10h and 12min of daylight.
The month with the least sunshine in Slidell is December, with an average of 5.1h of sunshine.
With an average maximum UV index of 3, December is the month with the lowest UV index.
Average temperature
Slidell, LA
The warmest month (with the highest average high temperature) is July (90.9°F).
The month with the lowest average high temperature is January (59.4°F).
The month with the highest average low temperature is August (77.4°F).
The coldest month (with the lowest average low temperature) is January (45.1°F).
Average pressure
Slidell, LA
- Average pressure in January:
30.17"Hg - Average pressure in February:
30.11"Hg - Average pressure in March:
30.09"Hg - Average pressure in April:
30"Hg - Average pressure in May:
30"Hg - Average pressure in June:
29.97"Hg
- Average pressure in July:
30.01"Hg - Average pressure in August:
29.97"Hg - Average pressure in September:
29.98"Hg - Average pressure in October:
30.03"Hg - Average pressure in November:
30.13"Hg - Average pressure in December:
30.13"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The months with the lowest atmospheric pressure are June and August (29.97"Hg).
Average wind speed
Slidell, LA
- Average wind speed in January:
7.6mph - Average wind speed in February:
7.8mph - Average wind speed in March:
7.7mph - Average wind speed in April:
8mph - Average wind speed in May:
6.7mph - Average wind speed in June:
5.9mph
- Average wind speed in July:
5.4mph - Average wind speed in August:
5.5mph - Average wind speed in September:
5.7mph - Average wind speed in October:
6.6mph - Average wind speed in November:
7.1mph - Average wind speed in December:
7.4mph
The windiest month (with the highest average wind speed) is April (8mph).
The calmest month (with the lowest average wind speed) is July (5.4mph).
Average humidity
Slidell, LA
The month with the highest relative humidity is December (79%).
The month with the lowest relative humidity is October (70%).
Average rainfall
Slidell, LA
- Average rainfall in January:
1.73" - Average rainfall in February:
1.89" - Average rainfall in March:
1.61" - Average rainfall in April:
1.77" - Average rainfall in May:
2.68" - Average rainfall in June:
2.99"
The wettest month (with the highest rainfall) is August (4.92").
The driest month (with the least rainfall) is November (1.5").
Average rainfall days
Slidell, LA
- Average rainfall days in January:
9.9 days - Average rainfall days in February:
11.8 days - Average rainfall days in March:
13 days - Average rainfall days in April:
11 days - Average rainfall days in May:
13.3 days - Average rainfall days in June:
18.2 days
- Average rainfall days in July:
22.8 days - Average rainfall days in August:
23.5 days - Average rainfall days in September:
18.4 days - Average rainfall days in October:
10.3 days - Average rainfall days in November:
8 days - Average rainfall days in December:
13.1 days
The month with the highest number of rainy days is August (23.5 days).
The month with the least rainy days is November (8 days).
Average snowfall
Slidell, LA
The month with the highest snowfall is January (0.2").
The months with the least snowfall are February, March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days
Slidell, LA
- Average snowfall days in January:
0.3 days - Average snowfall days in February:
0 days - Average snowfall days in March:
0 days - Average snowfall days in April:
0 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0.1 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0 days - Average snowfall days in December:
0.2 days
The month with the highest number of snowfall days is January (0.3 days).
The months with the least snowfall days are February, March, April, May, June, July, August, October and November (0 days).
Average daylight / Average sunshine
Slidell, LA
- Average daylight in January:
10h and 30min - Average daylight in February:
11h and 6min - Average daylight in March:
12h and 0min - Average daylight in April:
12h and 54min - Average daylight in May:
13h and 42min - Average daylight in June:
14h and 6min
- Average daylight in July:
13h and 54min - Average daylight in August:
13h and 12min - Average daylight in September:
12h and 18min - Average daylight in October:
11h and 24min - Average daylight in November:
10h and 36min - Average daylight in December:
10h and 12min
The month with the longest days is June (Average daylight: 14h and 6min).
The month with the shortest days is December (Average daylight: 10h and 12min).
- Average sunshine in January:
5h and 42min - Average sunshine in February:
5h and 12min - Average sunshine in March:
7h and 54min - Average sunshine in April:
9h and 54min - Average sunshine in May:
10h and 36min - Average sunshine in June:
11h and 6min
- Average sunshine in July:
10h and 36min - Average sunshine in August:
10h and 54min - Average sunshine in September:
10h and 18min - Average sunshine in October:
7h and 30min - Average sunshine in November:
6h and 6min - Average sunshine in December:
5h and 6min
The month with the most sunshine is June (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 6min).
Average sunshine days
Slidell, LA
- Average sunshine days in January:
19.8 days - Average sunshine days in February:
14.4 days - Average sunshine days in March:
16.5 days - Average sunshine days in April:
16 days - Average sunshine days in May:
14.8 days - Average sunshine days in June:
9.2 days
- Average sunshine days in July:
5.2 days - Average sunshine days in August:
5.1 days - Average sunshine days in September:
8.1 days - Average sunshine days in October:
17.6 days - Average sunshine days in November:
20.4 days - Average sunshine days in December:
16.4 days
The month with the most sunshine days is November (20.4 days).
The month with the least sunshine days is August (5.1 days).
Average UV index
Slidell, LA
The months with the highest UV index are May, June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).
Average cloud cover
Slidell, LA
The month with the most cloud cover is December (Cloud cover 45).
The month with the least cloud cover is October (Cloud cover 24).
Average visibility
Slidell, LA
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
