Summer in Karachi brings a mix of heat, humidity, and coastal winds that shape daily life in the city.
You’ll get long, hot days with average highs around 33°C (91°F), and lows rarely dip below 27°C (81°F).
The city’s subtropical desert climate and its spot along the Arabian Sea make the season feel even more intense.
From late spring into early autumn, the heat builds up fast.
By June, Karachi usually hits its hottest stretch.
The city doesn’t get much rain for most of the year, but the summer monsoon can bring sudden, heavy downpours in July and August.
This shift in the season also bumps up the humidity, making the air feel thick and sticky.
Despite all this, summer really sets the pace for Karachi.
Strong sea breezes roll in and cool off the evenings.
Long daylight hours and high UV levels mean you’ll want to plan outdoor stuff carefully.
Getting a handle on these weather patterns helps you know what to expect and how to make the most of your time during the city’s hottest months.
Overview of Karachi’s Summer Climate
Karachi’s summers mean long stretches of hot, humid weather, all thanks to its coastal spot on the Arabian Sea.
Temperatures stay high day and night.
Humidity and monsoon rains just add to the intensity.
Climate Classification and Location
Karachi falls under a hot desert climate (BWh) in the Köppen-Geiger system.
But being on the southern coast of Pakistan gives it some quirks you won’t find in inland deserts.
The Arabian Sea keeps temperatures from swinging wildly, but it also cranks up the humidity.
The city sits low, about 13–125 feet above sea level, so maritime winds have a big influence.
Summers here stretch from April through October.
June and July usually bring the most heat and humidity.
Unlike the north, Karachi doesn’t really have sharp seasonal changes.
Instead, you’ll get steady heat, high dew points, and a short but noticeable monsoon period in July and August.
This combo makes Karachi’s weather feel more tropical than you’d expect from a desert climate.
General Weather Characteristics
In summer, daily highs usually land between 89°F and 94°F (32°C to 34°C).
Lows hover close to 82°F (28°C), so nights don’t offer much relief.
Sea breezes keep things muggy rather than cool.
Humidity stays high, and by mid-summer, muggy conditions show up nearly every day.
Rain isn’t common, but it picks up in July and August, averaging up to 1.6 inches in a 31-day period.
Storms come on fast and hard, tied to the South Asian monsoon.
Winds mostly come from the west, averaging 12–14 mph.
That helps with airflow, but don’t expect it to cut the heat much.
Sunshine peaks in May and June, with more than 13 hours of daylight, before clouds and shorter days dim things in late summer.
Average Summer Temperatures in Karachi
Karachi’s summer stays hot and humid, with only minor shifts month to month.
You’ll get long runs of warm days and muggy nights.
Even after sunset, it’s not much cooler.
Monthly Highs and Lows
In early summer, average daily highs hit about 34°C (93°F).
By late August, highs dip a bit to 32°C (90°F).
Lows don’t change much, sticking near 28–29°C (82–84°F) most of the season.
June is usually the hottest, with highs peaking near 34°C and nights barely dropping below 29°C.
By August, things ease a little, but humidity goes up, so it still feels heavy.
Monthly averages:
| Month | Avg High | Avg Low |
|---|---|---|
| June | 34°C | 29°C |
| July | 33°C | 28°C |
| August | 32°C | 28°C |
You won’t see big swings, but the heat just keeps coming.
Daytime and Nighttime Temperature Ranges
Days in Karachi’s summer are just hot, plain and simple.
Afternoon highs usually sit between 32°C and 35°C (90–95°F).
High humidity makes it tough for your body to cool down.
At night, temperatures barely budge.
Lows stay in the 26–30°C (79–86°F) range.
With all that moisture in the air, nights feel almost as warm as the days.
It’s not the kind of place where you get cool, breezy evenings.
There isn’t much difference between day and night compared to cities away from the coast.
The Arabian Sea keeps things from getting too extreme, but the humidity makes sure the heat sticks around.
Temperature Variations Across Summer
Summer drags on, but temperatures don’t change much.
Highs drop by about 2–3°C from June to August.
This is a slow shift, and higher humidity and more clouds in July and August kind of cancel it out anyway.
June is the peak for heat, while late July and August feel a bit cooler but way more humid.
Sea surface temps also slide from 29°C in June down to 27°C by late August.
You’ll probably notice the difference in comfort more than the numbers.
Muggier air in late summer makes even “cooler” days feel heavier than earlier in the season.
Rainfall and Humidity During Summer
Karachi’s summer is a mix of hot weather, sudden heavy rain, and high humidity.
You’ll see dry spells, then out of nowhere, those monsoon showers shake things up.
Monsoon Onset and Rainfall Peaks
South Asian monsoon rains set the pace in Karachi.
The monsoon usually kicks in late June or early July.
Heaviest rainfall happens in July and August.
Most of the city’s yearly rain falls during these months.
June and September? Not so much.
Rain doesn’t hang around all day—it comes in short, heavy bursts.
Flooding happens fast because drainage isn’t great, and travel gets tricky.
On average, Karachi picks up about 80–120 mm of rain in July, a bit less in August.
But totals can swing a lot from year to year.
Rain days are pretty rare.
Even in the wettest months, you’ll only see showers on 5–8 days per month.
So most days stay hot and humid but dry.
That makes it a bit easier to plan, since rain is usually predictable and doesn’t drag on.
Humidity Levels and Seasonal Changes
Humidity ramps up fast in summer, especially when the monsoon winds start blowing in from the Arabian Sea.
In June, relative humidity usually sits between 55% and 65%.
By July and August, it can jump above 75% during the day and stay high at night.
This makes the heat feel even worse, even if the temperature doesn’t change much.
A day at 33°C can feel a lot warmer when the air’s loaded with moisture.
When the monsoon fades in September, humidity starts to drop.
You’ll notice clearer skies, drier air, and things get a bit more comfortable, though it’s still hot until late autumn.
If you’re visiting, the combo of high humidity and sudden rain means you’ll want to plan indoor stuff for peak afternoons, wear light clothes, and drink plenty of water.
Sunshine Hours and UV Index in Summer
Summer in Karachi means long days and strong sun exposure.
You’ll notice a big difference in sunshine from early to late summer.
UV levels often hit the kind of ranges that call for extra caution.
Average Daily Sunshine
Karachi gets a steady dose of sunshine in summer, but the hours shift month to month.
May is the sunniest, with around 10 hours of sunshine a day.
By July and August, clouds from the monsoon cut that down to about 5–6 hours.
So, you’ll get more sunlight in late spring and early summer.
Mid-summer days feel shorter because of the clouds.
Even then, you’ll still have several hours of daylight for outdoor plans.
Total monthly sunshine drops from 299 hours in May to about 147 hours in August.
If you’re planning on sightseeing or hitting the coast, this difference matters.
UV Index Trends
The UV index shoots up in Karachi’s summer.
Levels often hit very high to extreme (8–11+), especially late morning through mid-afternoon.
Even quick exposure can damage your skin if you’re not careful.
It’s best to do outdoor activities early or late when the sun’s less intense.
Midday is the riskiest, especially in May and June when skies are clearer.
You’ll want to use sunscreen (SPF 30+), hats, sunglasses, and light clothes.
Even on cloudy days in July and August, UV rays are still strong enough to burn.
Checking the daily UV forecast is smart, so you can tweak your plans and stay safe while enjoying Karachi’s summer.
Wind Patterns and Sea Temperatures
Karachi’s summer climate gets a lot of its character from steady coastal winds and warm sea waters.
Both have a big impact on how the season feels and what you can do outside.
Prevailing Winds and Wind Speeds
Summer brings stronger, steadier winds than the cooler months.
Average wind speeds hit about 4 meters per second (14 km/h or 9 mph) from May through August.
That’s enough breeze to rustle branches, stir up dust, and make evenings a little more bearable.
Winds usually come in from the southwest, carrying moist air from the Arabian Sea.
This helps take the edge off the intense daytime heat, but it also means humidity goes up.
Nights can feel sticky, but at least the air keeps moving.
In winter, things calm down a lot—wind speeds drop to about 1 meter per second (3.6 km/h or 2.2 mph).
So, you’ll notice summer’s winds whether you’re at Clifton Beach or just walking around the city.
The breeze is usually reliable, though sometimes it dies down and the heat feels worse.
For visitors, the wind is mostly a relief, but you’ll probably deal with some dust and sand.
Average Sea Temperature
The Arabian Sea off Karachi gets pretty warm in summer.
From late spring through September, sea surface temps hover between 28°C and 30°C (82°F to 86°F).
That’s perfect for swimming or other coastal stuff.
Unlike some places where the sea temperature swings all over, Karachi’s waters stay warm and steady.
You won’t get chilly dips, even at night.
This steady warmth adds to the city’s humidity, since more water evaporates into the air.
For travelers, the sea is inviting in summer.
But warm water plus strong winds can sometimes make the surf rough.
If you’re thinking of swimming or boating, keep an eye on local advisories.
The warm sea also helps keep the city hot at night.
It’s why Karachi’s evenings often feel warmer and stickier than you might guess.
Impact of Summer Weather on Daily Life in Karachi
High heat, thick humidity, and seasonal rains shape how you get around and look after your health.
Long daylight hours and coastal winds also play into how you plan your day-to-day routines.
Travel and Outdoor Activities
When the temperature hovers around 89–94°F and the humidity spikes, just walking or standing outside feels pretty uncomfortable. Early summer usually brings dry roads, but by July and August, short bursts of rain often flood low-lying neighborhoods.
These downpours slow traffic and throw commuting into chaos. You might notice the streets empty out in the afternoon, since most people save errands for the cooler mornings or late evenings.
Public transport gets crowded during those cooler hours, as everyone tries to dodge the worst of the heat. If you’re thinking about heading to the coast, sea breezes help a bit, but sometimes high winds mess with small boat trips.
Karachi’s beaches still draw crowds, though sudden rain showers can ruin plans in an instant. Honestly, it’s smart to keep light clothes, water, and sunscreen handy if you want to spend time outside.
Key challenges for travel:
- Midday heat makes long walks tough
- Sudden rain floods the streets
- Traffic jams get worse in the evenings
Health and Comfort Considerations
High humidity, which often creeps up to nearly 100% in late summer, makes it tough for sweat to evaporate. That means you’ll probably feel sticky and uncomfortable, and your risk of heat stress goes up if you’re outside for a long time.
Honestly, staying hydrated and finding shade or cool spots becomes pretty important for both comfort and safety. Nobody wants to feel miserable just because they forgot to drink water or got stuck in the sun.
At night, temperatures usually stay above 80°F, so you might not get much relief after the sun goes down. Most people turn to air conditioning or fans, but power outages during peak times can leave homes sweltering.
Older adults, kids, and anyone sensitive to heat often feel especially bogged down by muggy weather. If the air quality drops and the weather stays stagnant, people with breathing problems might struggle even more.
Practical steps you can take:
- Drink water regularly
- Wear breathable fabrics like cotton
- Plan indoor breaks during the afternoon
- Use shaded areas or cooling centers when available