easeweather.com
Units
°C
°F
Allegheny County
Forecast Today Tomorrow
more
Pennsylvania United States

Weather in Allegheny County for May 2025

Your guide to Allegheny County weather in May - trends and predictions
  • In general, the average temperature in Allegheny County at the beginning of May is 17.9 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 24.3 °F by the end of May.

  • Allegheny County sees moderate rainfall in May, averaging 9 rainy days.

  • New! Chat with our AI weatherman - it’s amazing and free.
Average dry days
22
Dry days
Average rainy days
9
Rainy days
Average snowy days
0
Snow days
Average temperatures
24°/8°
Temperatures
Average wind speed
13 km/h
Avg max wind
Average humidity
73 %
Avg humidity

Allegheny County in May average weather

Move between months or click on a day
Select a date

You can click on date

Access Allegheny County weather forecasts with a simple click. Select any date for comprehensive insights on temperature, rainfall, and wind conditions.
Got it

Temperatures trend during May in Allegheny County

See the weather trend as well as the moving average line

May weather day by day

Click on a date for more information
Date Weather Temperatures Rain UV More
May 1 Moderate or heavy rain shower
Moderate or heavy rain shower
16° /6° 4.5 mm 4
May 2 Moderate rain at times
Moderate rain at times
15° /6° 5 mm 4
May 3 Heavy rain at times
Heavy rain at times
18° /7° 6.1 mm 4
May 4 Moderate or heavy rain shower
Moderate or heavy rain shower
15° /9° 9.5 mm 4
May 5 Overcast
Overcast
19° /7° 0.6 mm 5
May 6 Sunny
Sunny
21° /9° 0.1 mm 6
May 7 Moderate or heavy rain shower
Moderate or heavy rain shower
21° /12° 5.7 mm 5
May 8 Overcast
Overcast
25° /15° 1.9 mm 6
May 9 Heavy rain at times
Heavy rain at times
18° /10° 7.7 mm 4
May 10 Partly cloudy
Partly cloudy
17° /7° 0.5 mm 5
May 11 Partly cloudy
Partly cloudy
19° /7° 2.6 mm 5
May 12 Overcast
Overcast
20° /8° 2.6 mm 5
May 13 Moderate or heavy rain shower
Moderate or heavy rain shower
21° /10° 5.4 mm 5
May 14 Cloudy
Cloudy
20° /11° 3.6 mm 5
May 15 Sunny
Sunny
22° /11° 1.9 mm 6
May 16 Moderate or heavy rain shower
Moderate or heavy rain shower
21° /10° 1.8 mm 5
May 17 Overcast
Overcast
20° /10° 5.5 mm 5
May 18 Sunny
Sunny
23° /9° 2.3 mm 6
May 19 Patchy rain possible
Patchy rain possible
25° /11° 1.2 mm 6
May 20 Moderate or heavy rain shower
Moderate or heavy rain shower
23° /12° 8.4 mm 6
May 21 Overcast
Overcast
26° /11° 0 mm 6
May 22 Sunny
Sunny
26° /12° 0.9 mm 7
May 23 Overcast
Overcast
23° /14° 7.8 mm 6
May 24 Cloudy
Cloudy
25° /13° 0.2 mm 6
May 25 Partly cloudy
Partly cloudy
23° /10° 6.1 mm 6
May 26 Sunny
Sunny
26° /9° 10.5 mm 6
May 27 Sunny
Sunny
24° /12° 3.4 mm 6
May 28 Sunny
Sunny
24° /11° 2.3 mm 6
May 29 Patchy rain possible
Patchy rain possible
22° /10° 8.4 mm 5
May 30 Partly cloudy
Partly cloudy
25° /10° 0 mm 6
May 31 Sunny
Sunny
26° /8° 0 mm 7
Next
Important Notice
Our weather forecast for Allegheny County in May is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Allegheny County forecast closer to your planned date for the most up-to-date weather information.

Allegheny County in May - FAQ

What are the expected maximum and minimum temperatures in Allegheny County during May?
Enjoy moderate daytime temperatures of up to 24° and cooler nights around 8°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Allegheny County during May?
Significant rainfall exceeding 172.1 mm is expected in Allegheny County during May, occurring over more than 9 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Allegheny County during May?
The average wind speed in Allegheny County during May is 13 km/h, suggesting breezy to windy conditions, depending on your activities.

May rainfall patterns in Allegheny County

Explore the daily rainfall trends and prepare for Allegheny Countys May weather 💧

UV exposure in Allegheny County during May

Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️
Top locations in Allegheny County
Select a location for an accurate weather forecast
More Locations

Quick links

Location coordinates Where is Allegheny County?

Get accurate weather forecasts for Allegheny County, located at latitude 40.441 and longitude -79.996. Stay updated with localized weather information tailored for Allegheny County.

Found a mistake?
We appreciate your attention to details. Tell us here.