Yearly & Monthly weather - Saint Louis, Senegal

The climate of Saint Louis

Characterized as a subtropical desert climate under the Köppen climate classification, St. Louis weathers a BWh climatic zone. Geographically placed in the northern part of Senegal, it experiences predominantly hot and arid conditions year-round. The city's climate parameters reveal relatively high average temperatures fluctuating from a low of 15.2°C (59.4°F) in the cooler months to a high of 33.7°C (92.7°F) during the hotter periods.

Relative humidity ranges from a low of 44% at the start of the year, growing incrementally to peak at 80% towards the third quarter, and steadily declining thereafter. This pattern indicates a dry first half of the year with a moisture-laden atmosphere in the latter half. Variations in rainfall corroborate this, with scanty precipitation in the initial months, leading up to copious rainfall of 94mm (3.7") during the height of the monsoon, and tapering off towards the year's end.

High daylight hours, varying from 11.2 hours to 13.1 hours, coupled with ample sunshine ranging from 7.5 hours to 9.5 hours, make most of the year bright and sunny. High UV index values persisting throughout the year should be of concern, reaching a maximum of 12. Sea temperatures show a steady incline from a cool 19.6°C (67.3°F) early in the year to a warm 28.2°C (82.8°F) during the summer months, ideal for marine activities.

A remarkable characteristic of the Saint Louis climate is the abrupt shift from near zero rainfall to heavy monsoon showers between May and September. The month of August promises both the highest rainfall and maximum humidity, combined with soaring temperatures around 31.5°C (88.7°F), posing possibly the most challenging weather conditions of the year.

The best time to visit Saint Louis

Considering weather parameters, November stands out as the best time to visit Saint Louis. The month enjoys a pleasant average temperature of 33.4°C (92.1°F), a marked decrease in rainfall with just 0mm (0") precipitation, and a comfortable sea temperature of 25.3°C (77.5°F). Humidity drops significantly to 54%, and there are ample daylight hours of about 11.4 hours coupled with 8.2 hours of sunshine, making exploring the city an enjoyable experience.

The worst time to visit Saint Louis

Travel advisories often suggest avoiding a trip to Saint Louis from June to September. These months experience the height of the monsoon with rainfall upwards of 40mm (1.57"), along with the highest humidity levels culminating at 80%. These climatic conditions, coupled with high temperatures averaging above 30°C (86°F), make it uncomfortable for outdoor activities.

Spring weather in Saint Louis

Spring in Saint Louis, covering March, April, and May, welcomes a gradual increase in temperatures from 30.5°C (86.9°F) to 32.7°C (90.9°F). The humidity levels show a steady rise starting in March. Early spring witnesses almost no rainfall, while by the end of May, it begins to show signs of the upcoming monsoon. Sea temperatures also start warming up, ranging between 19.5°C (67.1°F) to 24.4°C (75.9°F).

Summer weather in Saint Louis

The summer season in Saint Louis spans June through August. It is characterized by high temperatures hovering around 30°C (86°F) and sees the onset of the monsoons in June. With the arrival of the rains, humidity levels surge affecting comfort. Sea temperatures are warm, ranging from 24.4°C (75.9°F) to 28°C (82.4°F), suitable for water-related activities.

Autumn weather in Saint Louis

Autumn months of September, October, and November in Saint Louis feature a gradual decrease in both temperatures and rainfall. The relative humidity drops from 78.5% in September to 54% in November, bringing some relief. Sea temperatures begin to cool down after hitting a high of 28.2°C (82.8°F) in September.

Winter weather in Saint Louis

Winter in Saint Louis, transitioning from December through February, experiences a noticeable drop in the average high and low temperatures, making it cooler compared to the torrid summer months. Rainfall is minimal to non-existent during this time of the year. Sea temperatures are moderate, making this period favorable for beach activities. Sunshine hours and daylight continue to be abundant despite being winter.

Weather in January

January in Saint Louis, Senegal introduces the New Year with warm days averaging high temperatures of 30.5°C (86.9°F) and lows falling to 15.2°C (59.4°F). The sea welcomes tourists with a moderate temperature of 21.5°C (70.7°F), perfect for a variety of aquatic activities. Weather in January »

Weather in February

By February, Saint Louis shows a slight increase in temperature, humidity, and rainfall from January, ushering in a subtle change in the weather pattern. With high temperatures rising to 32.2°C (90°F), days are mildly hotter, yet the nights remain wonderfully pleasant. Weather in February »

Weather in March

March in Saint Louis marks the arrival of slightly warmer days, with the highest known temperature reaching 32.7°C (90.9°F). This month showcases clear skies with virtually no rainfall, marking it a perfect window for outdoor activities and city explorations. Weather in March »

Weather in April

April in Saint Louis introduces an uptick in weather activity, with temperatures and humidity on the rise and zero rainfall. The temperature range for month floats around 31.7°C (89.1°F) (high) and 18°C (64.4°F) (low), indicating warmer days and nights. Weather in April »

Weather in May

May signals the actual arrival of Saint Louis's wet season, with average high temperatures lingering around 30.3°C (86.5°F). This coincides with the beginning of a palpable increase in humidity to 69.5% and the sea temperature rising to an inviting 21.8°C (71.2°F). Weather in May »

Weather in June

In June, tourists in Saint Louis are treated to a remarkable shift in the climate, with high temperatures averaging around 30.4°C (86.7°F). This month, the rainfall registers at 7mm (0.28"), marking the true beginning of the wet season. Weather in June »

Weather in July

In July, the weather in Saint Louis reaches its most varied. The city sees its highest levels of rainfall, with an average of 40mm (1.57") collected over 4 days. July also marks the peak of high temperatures averaging 30.7°C (87.3°F), while nights turn noticeably warmer with temperatures maintained at a steady 24.4°C (75.9°F). Weather in July »

Weather in August

August in Saint Louis is recognized for marking the peak of the wet season, with the highest rainfall of the year, measuring up to 94mm (3.7"). Along with the rainfall, this month experiences its highest average low and sea temperatures, standing at 25°C (77°F) and 27.8°C (82°F) respectively. Weather in August »

Weather in September

September registers a decline in the wet season, although the average rainfall still remains high at 92mm (3.62"). Also, the sea's temperature is at its warmest, reaching 28.2°C (82.8°F), inviting those seeking to do water activities. Weather in September »

Weather in October

In October, the weather in Saint Louis starts to calm down, with a considerable decrease in the amount of rainfall, which averages at 23mm (0.91"). The city's temperature stays pretty much constant; however, days grow slightly shorter with daylight hours decreasing to 11.8. Weather in October »

Weather in November

By November, Saint Louis, Senegal, experiences a major respite from the long-standing wet season, as the rainfall drops to a mere 0mm (0"), over no rainy days. This coincides with the sea temperature falling to 25.3°C (77.5°F), causing a visible decline in the heat and humidity. Weather in November »

Weather in December

December in Saint Louis ushers in a shift towards cooler weather, with the average lowest dropping to 16.4°C (61.5°F). This month is also subject to minor rainfall of only 1mm (0.04"), continuing the dry streak initiated in November. Weather in December »

Updated: Jan 26, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the least humid month in Saint Louis?

The least humid month is January, with an average relative humidity of 44%.

How much does it rain in Saint Louis?

In Saint Louis, during the entire year, the rain falls for 20 days and collects up to 261mm (10.28") of precipitation.

When is the lowest UV index in Saint Louis?

January and December, with an average maximum UV index of 8, are months with the lowest UV index in Saint Louis, Senegal.

What is the month with the coldest sea water in Saint Louis?

With an average sea temperature of 19.6°C (67.3°F), March is the month with the coldest seawater in Saint Louis, Senegal.

When is the highest UV index in Saint Louis?

March through September, with an average maximum UV index of 12, are months with the highest UV index in Saint Louis, Senegal.

What is the driest month in Saint Louis?

April is the only month when rain does not fall.

What month has the most sunshine in Saint Louis?

April has the most sunshine of the year, with an average of 9.5h of sunshine.

What is the coldest time of year in Saint Louis?

May, recording an average high temperature of 30.3°C (86.5°F) and a low temperature of 19.4°C (66.9°F), is Saint Louis's coldest month.

When does it rain in Saint Louis?

January through March, May through December are months with rainfall in Saint Louis, Senegal.

When are the longest days in Saint Louis?

The month with the longest days is June, with an average of 13h and 6min of daylight.

What is the month with the least sunshine in Saint Louis?

June has the least sunshine of the year, with an average of 7.4h of sunshine.

What is the most humid month in Saint Louis?

With an average relative humidity of 80%, August is the most humid month in Saint Louis.

What is the rainiest month in Saint Louis?

August is the month with the most rainfall. Rain falls for 6 days and accumulates 94mm (3.7") of precipitation.

What is the month with the warmest sea water in Saint Louis?

The month with the warmest seawater is September, with an average sea temperature of 28.2°C (82.8°F).

What are the warmest months in Saint Louis?

In Saint Louis, Senegal, the peak temperatures are generally noted in October, averaging a high of 33.7°C (92.7°F) and a low of 23.5°C (74.3°F).

What is the month with the shortest days in Saint Louis?

December has the shortest days of the year in Saint Louis, with an average of 11h and 12min of daylight.

Is there Daylight Saving Time (DST) in Saint Louis?

Saint Louis, Senegal, does not utilize Daylight Saving Time (DST). GMT timezone is used throughout the entire year.

Today

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Long-term

Year J F M A M J J A S O N D

Average temperature
Saint Louis, Senegal

Average high temperature in January:
30.5°C
Average high temperature in February:
32.2°C
Average high temperature in March:
32.7°C
Average high temperature in April:
31.7°C
Average high temperature in May:
30.3°C
Average high temperature in June:
30.4°C

Average high temperature in July:
30.7°C
Average high temperature in August:
31.5°C
Average high temperature in September:
32.3°C
Average high temperature in October:
33.7°C
Average high temperature in November:
33.4°C
Average high temperature in December:
31°C

The warmest month (with the highest average high temperature) is October (33.7°C).
The month with the lowest average high temperature is May (30.3°C).

Average low temperature in January:
15.2°C
Average low temperature in February:
16.5°C
Average low temperature in March:
17.4°C
Average low temperature in April:
18°C
Average low temperature in May:
19.4°C
Average low temperature in June:
22.4°C

Average low temperature in July:
24.4°C
Average low temperature in August:
25°C
Average low temperature in September:
25.1°C
Average low temperature in October:
23.5°C
Average low temperature in November:
19.5°C
Average low temperature in December:
16.4°C

The month with the highest average low temperature is September (25.1°C).
The coldest month (with the lowest average low temperature) is January (15.2°C).

Average humidity
Saint Louis, Senegal

The month with the highest relative humidity is August (80%).
The month with the lowest relative humidity is January (44%).

Average rainfall
Saint Louis, Senegal

The wettest month (with the highest rainfall) is August (94.3mm).
The driest month (with the least rainfall) is April (0mm).

Average rainfall days
Saint Louis, Senegal

Average rainfall days in January:
1 days
Average rainfall days in February:
1 days
Average rainfall days in March:
0 days
Average rainfall days in April:
0 days
Average rainfall days in May:
0 days
Average rainfall days in June:
1 days

Average rainfall days in July:
4 days
Average rainfall days in August:
6 days
Average rainfall days in September:
6 days
Average rainfall days in October:
1 days
Average rainfall days in November:
0 days
Average rainfall days in December:
0 days

The months with the highest number of rainy days are August and September (6 days).
The months with the least rainy days are March, April, May, November and December (0 days).

Average sea temperature
Saint Louis, Senegal

Average sea temperature in January:
21.5°C
Average sea temperature in February:
19.7°C
Average sea temperature in March:
19.6°C
Average sea temperature in April:
20.2°C
Average sea temperature in May:
21.8°C
Average sea temperature in June:
24.4°C

Average sea temperature in July:
26.3°C
Average sea temperature in August:
27.8°C
Average sea temperature in September:
28.2°C
Average sea temperature in October:
27.8°C
Average sea temperature in November:
25.3°C
Average sea temperature in December:
23.3°C

The best month for swimming (with the highest average sea temperature) is September (28.2°C).
The coldest month (with the lowest average sea temperature) is March (19.6°C).

Average daylight / Average sunshine
Saint Louis, Senegal

Average daylight in January:
11h and 2min
Average daylight in February:
11h and 4min
Average daylight in March:
12h and 1min
Average daylight in April:
12h and 3min
Average daylight in May:
12h and 5min
Average daylight in June:
13h and 1min

Average daylight in July:
13h and 0min
Average daylight in August:
12h and 4min
Average daylight in September:
12h and 1min
Average daylight in October:
11h and 5min
Average daylight in November:
11h and 2min
Average daylight in December:
11h and 1min

The month with the longest days is June (Average daylight: 13h and 6min).
The month with the shortest days is December (Average daylight: 11h and 12min).

Average sunshine in January:
7h and 5min
Average sunshine in February:
8h and 3min
Average sunshine in March:
8h and 5min
Average sunshine in April:
9h and 3min
Average sunshine in May:
9h and 1min
Average sunshine in June:
7h and 2min

Average sunshine in July:
7h and 5min
Average sunshine in August:
8h and 0min
Average sunshine in September:
7h and 4min
Average sunshine in October:
8h and 2min
Average sunshine in November:
8h and 1min
Average sunshine in December:
7h and 3min

The month with the most sunshine is April (Average sunshine: 9h and 30min).
The month with the least sunshine is June (Average sunshine: 7h and 24min).

Average UV index
Saint Louis, Senegal

The months with the highest UV index are March, April, May, June, July, August and September (UV index 12).
The months with the lowest UV index are January and December (UV index 8).

Climate and monthly weather forecastSaint Louis, Senegal

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