Allegheny County (Pittsburgh)
May
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.
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22
Dry days
9
Rainy days
0
Snow days
24°/8°
Temperatures
13 km/h
Avg max wind
73 %
Avg humidity
Allegheny County in May average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  16° | 2 15° | 3  18° | 4 15° | |||
| 5  19° | 6  21° | 7 21° | 8 25° | 9 18° | 10  17° | 11 19° |
| 12 20° | 13 21° | 14  20° | 15 22° | 16 21° | 17 20° | 18 23° |
| 19  25° | 20 23° | 21 26° | 22 26° | 23 23° | 24 25° | 25 23° |
| 26 26° | 27 24° | 28 24° | 29 22° | 30 25° | 31 26° |
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Temperatures trend during May in Allegheny County
See the weather trend as well as the moving average line
May weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| May 1 | Moderate or heavy rain shower | 16° /6° | 4.5 mm | 4 | |
| May 2 | Moderate rain at times | 15° /6° | 5 mm | 4 | |
| May 3 | Heavy rain at times | 18° /7° | 6.1 mm | 4 | |
| May 4 | Moderate or heavy rain shower | 15° /9° | 9.5 mm | 4 | |
| May 5 | Overcast | 19° /7° | 0.6 mm | 5 | |
| May 6 | Sunny | 21° /9° | 0.1 mm | 6 | |
| May 7 | Moderate or heavy rain shower | 21° /12° | 5.7 mm | 5 | |
| May 8 | Overcast | 25° /15° | 1.9 mm | 6 | |
| May 9 | Heavy rain at times | 18° /10° | 7.7 mm | 4 | |
| May 10 | Partly cloudy | 17° /7° | 0.5 mm | 5 | |
| May 11 | Partly cloudy | 19° /7° | 2.6 mm | 5 | |
| May 12 | Overcast | 20° /8° | 2.6 mm | 5 | |
| May 13 | Moderate or heavy rain shower | 21° /10° | 5.4 mm | 5 | |
| May 14 | Cloudy | 20° /11° | 3.6 mm | 5 | |
| May 15 | Sunny | 22° /11° | 1.9 mm | 6 | |
| May 16 | Moderate or heavy rain shower | 21° /10° | 1.8 mm | 5 | |
| May 17 | Overcast | 20° /10° | 5.5 mm | 5 | |
| May 18 | Sunny | 23° /9° | 2.3 mm | 6 | |
| May 19 | Patchy rain possible | 25° /11° | 1.2 mm | 6 | |
| May 20 | Moderate or heavy rain shower | 23° /12° | 8.4 mm | 6 | |
| May 21 | Overcast | 26° /11° | 0 mm | 6 | |
| May 22 | Sunny | 26° /12° | 0.9 mm | 7 | |
| May 23 | Overcast | 23° /14° | 7.8 mm | 6 | |
| May 24 | Cloudy | 25° /13° | 0.2 mm | 6 | |
| May 25 | Partly cloudy | 23° /10° | 6.1 mm | 6 | |
| May 26 | Sunny | 26° /9° | 10.5 mm | 6 | |
| May 27 | Sunny | 24° /12° | 3.4 mm | 6 | |
| May 28 | Sunny | 24° /11° | 2.3 mm | 6 | |
| May 29 | Patchy rain possible | 22° /10° | 8.4 mm | 5 | |
| May 30 | Partly cloudy | 25° /10° | 0 mm | 6 | |
| May 31 | Sunny | 26° /8° | 0 mm | 7 | |
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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 ☀️
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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.
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