Climate and monthly weather forecast
Pittsburgh, PA

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A beautiful dusk panorama of Pittsburgh, Pennsylvania, with the river and several bridges
A beautiful dusk panorama of Pittsburgh, Pennsylvania, with the river and several bridges

The climate of Pittsburgh

Categorized by the Köppen climate classification as Cfa, Pittsburgh, Pennsylvania, is characterized by a humid subtropical climate with no dry season. This unique climate categorization is influenced by the city's geographical position, which consists of valleys and ridges with three rivers converging within the city limits. Within this classification, humidity levels hover between 73% in summer months and 84% in winter. Additionally, throughout the year, the pressure ranges from 30.08" (764mm) in spring to 30.11" (765mm) in winter while cloud percentages vary from 36% to 70%.

The city experiences distinct seasonal weather changes. High temperatures ascend from 33.1°F (0.6°C) in winter to 84°F (28.9°C) in summer before descending again. Conversely, low temperatures vary from 21°F (-6.1°C) in winter to 63°F (17.2°C) in summer. Rainfall and snowfall also demonstrate significant fluctuations. Rainfall varies from 1.54" (39mm) to 3.07" (78mm) while snowfall ranges from zero in summer to 3.31" (84mm) in winter. The differentiations in precipitation are accompanied by substantial shifts in both sunshine hours, from 2.8 hours to a peak of 10.1 hours, and daylight hours, which range from 9.3 hours to 15 hours.

It is noteworthy that the maximum average monthly wind speed picks up pace from February's 7.6mph (12.2km/h) to April's 7.5mph (12.1km/h), then slows down during summer months to a low 4.8mph (7.7km/h) in July and August, and gradually increases to December's peak of 7.3mph (11.7km/h).

The best time to visit Pittsburgh

The ideal time to visit Pittsburgh would be during the late spring and early summer months which provide a hospitable climate. From May to June, temperatures climb from 61°F (16.1°C) to 79.3°F (26.3°C) and rainfall is moderate, ranging between 2.76" (70mm) and 3.07" (78mm). Humidity stays relatively steady around 76% and abundant sunshine hours from 8.7 to 9.3 hours combined with extended daylight hours from 14.4 to 15 hours offer excellent conditions for outdoor activities.

The worst time to visit Pittsburgh

Winter months prove to be challenging for tourism in Pittsburgh, with January being the coldest period. During this time, high and low temperatures range from a frigid 33.1°F (0.6°C) to a chilly 21°F (-6.1°C). Additionally, rainfall reaches lows at 1.69" (43mm) and high humidity levels about 84% add to the wintry bleakness. Only 2.8 hours of sunshine with 9.7 hours of daylight may feel gloomy to tourists, and snowfall at an average 3.31" (84mm) could disrupt travel plans.

Spring weather in Pittsburgh

Springtime in Pittsburgh is characterized by an inviting lift in temperature. From March through May, high temperatures rise from a mild 47.8°F (8.8°C) to a comfortable 72.1°F (22.3°C), while low temperatures increase from 31.5°F (-0.3°C) to 51.4°F (10.8°C). Rainfall is moderately high, fluctuating from 2.05" (52mm) to 3.07" (78mm). The city sees brightening with average sunshine hours stretching from 5.2 hours to 8.7 hours, and daylight hours extending from 12 hours to 14.4 hours.

Summer weather in Pittsburgh

Summertime in Pittsburgh, encompassing June to August, brings warmth and sun to the city. High temperatures gravitate from a pleasant 79.3°F (26.3°C) to a warm 84°F (28.9°C), while low temperatures climb from 58.6°F (14.8°C) to 63°F (17.2°C). Rainfall stays consistent around 2.76" (70mm), providing much-needed relief from the heat. Daylight extends to 15 hours, and visitors will enjoy the longest sunshine duration of the year ranging from 9.3 hours to 10.1 hours.

Autumn weather in Pittsburgh

Autumn sees a gradual drop in temperatures in Pittsburgh, with high temperatures falling from 75.7°F (24.3°C) in September to 49.1°F (9.5°C) in November. Similarly, low temperatures drop from 55.9°F (13.3°C) to 34.2°F (1.2°C). Rainfall during this period decreases moderately from 2.13" (54mm) to 1.54" (39mm). Daylight hours get considerably shorter from 12.5 hours to 9.9 hours and sunshine hours dwindle from 8.2 hours to 4.7 hours.

Winter weather in Pittsburgh

Winter in Pittsburgh, spanning December to February, is chilly and overcast. High and low temperatures reach their yearly lowest, fluctuating from 33.1°F (0.6°C) to 39.4°F (4.1°C) and from 21°F (-6.1°C) to 23.4°F (-4.8°C) respectively. Rainfall is relatively stable between 1.69" (43mm) and 2.13" (54mm), and with elevated humidity levels around 84%, the cold can feel more biting. The city sees the least amount of sunshine, with duration from 2.8 hours to 3.4 hours and daylight hours range from 9.3 hours to 9.7 hours. The snowfall starts to gather, ranging from 2.01" (51mm) to 3.31" (84mm).

Weather in January

The first month of the year in Pittsburgh, Pennsylvania, often sees winter weather in full flow. As temperatures reach icy extremes, residents can expect a monthly high of 33.1°F (0.6°C) and a low of 21°F (-6.1°C). The sky remains mostly overcast, with limited sunlight hours, making indoor activities a good choice this month. Weather in January »

Weather in February

February in Pittsburgh witnesses a subtle rise in temperatures, hinting at a slow transition towards spring weather. Snowfall decreases slightly, although winter conditions remain, with snowfalls of 2.83" (72mm) still possible. Weather in February »

Weather in March

The arrival of March ushers in an early spring atmosphere in Pittsburgh, characterized by softer, more bearable temperatures. Sunshine duration increases quite significantly from February, culminating in a monthly daytime high temperature of 47.8°F (8.8°C), indicative of the gradually pacifying weather. Weather in March »

Weather in April

April in Pittsburgh witnesses a complete transformation into spring, with regular rain showers and a burst of flora across the city. The weather is very changeable, with rainfalls the highest for the year at 2.76" (70mm), contributing to the growth of new greenery all around. Weather in April »

Weather in May

In May, Pittsburgh displays full-on spring weather, coupled with agreeable warmth and an explosion of colors throughout the city. The noticeable rise in relative humidity to 76% is indicative of the city's transition from spring to summer, with an increase in late afternoon thunderstorms. Weather in May »

Weather in June

Summer officially kicks off in June in Pittsburgh, and it's characterized by enjoyable warmth and long daylight hours. Typical June weather sees a high of 79.3°F (26.3°C), providing residents and tourists the perfect conditions for exploring the city. Weather in June »

Weather in July

July is the peak of summer in Pittsburgh, demonstrating the season's most intense conditions. With a remarkable high temperature of 84°F (28.9°C), it is undeniably the hottest month of the year. Despite the heat, it's a fantastic time to partake in water-related activities, or simply relax in the numerous city parks. Weather in July »

Weather in August

In August, summer starts to wind down in Pittsburgh, though warm weather persists throughout the month. Summer peaks start to descend, with noticeable changes, including a drop in the maximum temperature to 82.2°F (27.9°C). Though experiencing some rain, it's still a great time for outdoor exploration before autumn sets in. Weather in August »

Weather in September

September in Pittsburgh greets autumn with open arms, showcasing a steady decrease in temperatures, resulting in comfortable, moderate weather. The daylight hours reduce significantly from August down to 12.5 hours along with a slight increase in rainfall. Weather in September »

Weather in October

The arrival of October in Pittsburgh brings substantial changes in the city's weather pattern, bringing an end to the summer heat and welcoming the full onset of autumn. The fallen leaves create a breathtaking spectacle, transforming the city into a picturesque postcard-like scene. Weather in October »

Weather in November

In November, the city of Pittsburgh starts to transition from autumn to winter, with a significant fall in temperatures. The weather is quite variable this time of year, with sudden shifts and an increased chance of early snowfall. Weather in November »

Weather in December

December in Pittsburgh is undeniably a winter month, characterized by shorter daylight hours and frosty temperatures. The city enters into a spectacular mode as a winter wonderland, hosting myriad of holiday celebrations. Although snowfall picks up from November with a decent 2.01" (51mm) recorded, it's not daunting for residents who seize the opportunity for fun-filled winter activities. Weather in December »

Frequently asked questions

What part of the year is the coldest?

In Pittsburgh, January is known for its average lowest temperatures, reaching a high of 33.1°F (0.6°C) and a low of 21°F (-6.1°C).

What is the most humid month?

January and February, with an average relative humidity of 84%, are most humid months.

How much does it rain?

Throughout the year, there are 163.6 rainfall days, and 26.93" (684mm) of precipitation is accumulated.

When does it snow?

Months with snowfall are January through April, October through December.

When does it snow the most?

The month with the most snowfall is January, when snow falls for 14.4 days and typically aggregates up to 3.31" (84mm) of snow.

How many days does it snow?

Throughout the year, there are 47.7 snowfall days, and 11.77" (299mm) of snow is accumulated.

What is the month with the least sunshine?

January has the least sunshine of the year, with an average of 2.8h of sunshine.

When is Daylight Saving Time (DST)?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.

What is the wettest month?

The month with the most rainfall in Pittsburgh is May, when the rain falls for 18.9 days and typically aggregates up to 3.07" (78mm) of precipitation.

When it does not snow?

May through September are months without snowfall.

When is the highest UV index?

May through July, with an average maximum UV index of 6, are months with the highest UV index.

When are the longest days in Pittsburgh?

June has the longest days of the year, with an average of 15h and 0min of daylight.

What are the warmest months?

In Pittsburgh, July is known for its average highest temperatures, reaching a high of 84°F (28.9°C) and a low of 63°F (17.2°C).

What are the least humid months?

July and August, with an average relative humidity of 73%, are the least humid months.

What month has the most sunshine?

With an average of 10.1h of sunshine, August has the most sunshine of the year.

What is the driest month?

November is the month with the least rainfall. Rain falls for 9.8 days and accumulates 1.54" (39mm) of precipitation.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 18min of daylight.

What is the month with the lowest UV index?

With an average maximum UV index of 1, December is the month with the lowest UV index.

Average temperature
Pittsburgh, PA

Average temperature - Pittsburgh, PA

The warmest month (with the highest average high temperature) is July (84°F).
The month with the lowest average high temperature is January (33.1°F).

The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (21°F).

Average pressure
Pittsburgh, PA

Average pressure - Pittsburgh, PA

The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).

Average wind speed
Pittsburgh, PA

Average wind speed - Pittsburgh, PA

The windiest month (with the highest average wind speed) is January (8mph).
The calmest months (with the lowest average wind speed) are July and August (4.8mph).

Average humidity
Pittsburgh, PA

Average humidity - Pittsburgh, PA

The months with the highest relative humidity are January and February (84%).
The months with the lowest relative humidity are July and August (73%).

Average rainfall
Pittsburgh, PA

Average rainfall - Pittsburgh, PA

The wettest month (with the highest rainfall) is May (3.07").
The driest month (with the least rainfall) is November (1.54").

Average rainfall days
Pittsburgh, PA

Average rainfall days - Pittsburgh, PA

The month with the highest number of rainy days is May (18.9 days).
The month with the least rainy days is January (8.9 days).

Average snowfall
Pittsburgh, PA

Average snowfall - Pittsburgh, PA

The month with the highest snowfall is January (3.31").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days
Pittsburgh, PA

Average snowfall days - Pittsburgh, PA

The month with the highest number of snowfall days is January (14.4 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight / Average sunshine
Pittsburgh, PA

Average daylight / Average sunshine - Pittsburgh, PA

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).

The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 2h and 48min).

Average sunshine days
Pittsburgh, PA

Average sunshine days - Pittsburgh, PA

The month with the most sunshine days is November (16.5 days).
The month with the least sunshine days is February (9.6 days).

Average visibility
Pittsburgh, PA

Average visibility - Pittsburgh, PA

The months with the highest visibility are April, June, July, August and November (6mi).
The months with the lowest visibility are January, February, March, May, September, October and December (5mi).

Pittsburgh, Pennsylvania, USA

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