Climate and monthly weather forecast
Slidell, LA

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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 »

Frequently asked questions

What is the coldest time of year?

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.

How much does it rain?

In Slidell, Louisiana, during the entire year, the rain falls for 173.3 days and collects up to 30.79" (782mm) of precipitation.

When does it snow?

The only month with snowfall is January.

What is the snowiest month?

January is the month with the most snowfall in Slidell. Snow falls for 0.3 days and accumulates 0.2" (5mm) of snow.

How much does it snow?

In Slidell, during the entire year, snow falls for 0.6 days and aggregates up to 0.2" (5mm) of snow.

When it does not snow?

In Slidell, snow does not fall in February through December.

When is Daylight Saving Time (DST) in Slidell?

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.

When is the highest UV index?

The months with the highest UV index are May through August, with an average maximum UV index of 7.

When are the longest days?

With an average of 14h and 6min of daylight, June has the longest days of the year.

What month has the most sunshine?

The month with the most sunshine is June, with an average of 11.1h of sunshine.

What is the warmest month?

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).

What is the wettest month?

August is the month with the most rainfall. Rain falls for 23.5 days and accumulates 4.92" (125mm) of precipitation.

What is the least humid month?

With an average relative humidity of 70%, October is the least humid month.

What is the driest month?

November is the month with the least rainfall in Slidell. Rain falls for 8 days and accumulates 1.5" (38mm) of precipitation.

What is the most humid month?

The most humid month in Slidell is December, with an average relative humidity of 79%.

What is the month with the shortest days?

The month with the shortest days in Slidell is December, with an average of 10h and 12min of daylight.

What is the month with the least sunshine?

The month with the least sunshine in Slidell is December, with an average of 5.1h of sunshine.

When is the lowest UV index?

With an average maximum UV index of 3, December is the month with the lowest UV index.

Average temperature
Slidell, LA

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 - Slidell, LA

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 - Slidell, LA

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

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 - Slidell, LA

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 - Slidell, LA

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

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 - Slidell, LA

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 / Average sunshine - Slidell, LA

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).

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 - Slidell, LA

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 visibility
Slidell, LA

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).

Slidell, Louisiana, USA

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