Allegheny County (Pittsburgh)
May
Weather in Allegheny County, Pennsylvania for May 2027
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 17.7 °C. As the month progressed, temperatures tended to significantly warm up, reaching an average of 22.1 °C by the end of May.
Allegheny County in May brings notable rainfall, with an average of 17 rainy days and a total precipitation of 225.3 mm.
Is May a good time to visit Allegheny County? check out the best time to travel to Allegheny County page.
✨ Is May a good time to visit Allegheny County? – Ask the AI Weatherman
Temperatures
Rain 🌧️
More
14
Dry days
17
Rainy days
0
Snow days
20°/10°
Temperatures
14 km/h
Avg max wind
76 %
Avg humidity
Allegheny County Weather May
Move between months or click on a day
Temperatures trend during May in Allegheny County
See the weather trend as well as the moving average line
May weather in Allegheny County day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| May 1 |  Light rain | 17° /6° | 4.5 mm | 5 | |
| May 2 |  Moderate rain | 16° /8° | 21.8 mm | 5 | |
| May 3 |  Heavy rain at times | 18° /8° | 27.7 mm | 6 | |
| May 4 | Moderate rain | 17° /10° | 11.4 mm | 3 | |
| May 5 | Light rain | 20° /11° | 4.4 mm | 4 | |
| May 6 | Moderate rain | 18° /10° | 10 mm | 4 | |
| May 7 |  Moderate or heavy rain shower | 19° /11° | 8.1 mm | 6 | |
| May 8 |  Patchy rain possible | 21° /11° | 1.7 mm | 5 | |
| May 9 | Heavy rain at times | 17° /10° | 5.9 mm | 4 | |
| May 10 | Patchy rain possible | 17° /6° | 1.1 mm | 5 | |
| May 11 | Patchy rain possible | 19° /8° | 1.3 mm | 7 | |
| May 12 | Patchy rain possible | 20° /9° | 1.3 mm | 6 | |
| May 13 |  Heavy rain | 19° /11° | 34.6 mm | 4 | |
| May 14 | Light rain | 18° /11° | 5 mm | 4 | |
| May 15 | Patchy rain possible | 23° /11° | 1 mm | 6 | |
| May 16 | Moderate or heavy rain shower | 23° /12° | 5.2 mm | 6 | |
| May 17 | Moderate rain | 23° /13° | 12.3 mm | 5 | |
| May 18 | Patchy rain possible | 24° /12° | 1.3 mm | 6 | |
| May 19 | Patchy rain possible | 24° /13° | 1.1 mm | 6 | |
| May 20 | Moderate or heavy rain shower | 21° /10° | 6.5 mm | 4 | |
| May 21 | Light rain | 22° /11° | 7.6 mm | 7 | |
| May 22 | Moderate or heavy rain shower | 21° /11° | 6.9 mm | 7 | |
| May 23 | Light rain | 18° /12° | 8.1 mm | 4 | |
| May 24 | Light rain | 22° /12° | 6.8 mm | 5 | |
| May 25 | Light rain | 22° /11° | 4 mm | 5 | |
| May 26 | Light rain | 24° /10° | 5.7 mm | 6 | |
| May 27 | Moderate or heavy rain shower | 22° /13° | 6.5 mm | 6 | |
| May 28 | Light rain | 21° /11° | 6 mm | 7 | |
| May 29 | Light rain | 22° /10° | 4.2 mm | 6 | |
| May 30 | Patchy rain possible | 22° /11° | 1.4 mm | 7 | |
| May 31 | Patchy rain possible | 24° /9° | 2 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.
Change Month
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 20° and cooler nights around 10°. 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 225.3 mm is expected in Allegheny County during May, occurring over more than 17 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 14 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 💧
Typically, Allegheny County has 17 rainy days in May with a total of 225.3 mm of rainfall.
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
More Allegheny County weather pages
You are here
Found a mistake?
We appreciate your attention to details. Tell us here.