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Weather in Johnstown, Pennsylvania for May 2026

Your guide to Johnstown weather in May - trends and predictions

    Temperatures

  • In general, the average temperature in Johnstown at the beginning of May is 19.6 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 15.1 °F by the end of May.

  • Rain 🌧️

  • Johnstown experiences heavy rainfall in May, with over 20 rainy days and an average total precipitation 197 mm.

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Average dry days
7
Dry days
Average rainy days
24
Rainy days
Average snowy days
0
Snow days
Average temperatures
17°/10°
Temperatures
Average wind speed
18 km/h
Avg max wind
Average humidity
82 %
Avg humidity

Johnstown Weather May

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Temperatures trend during May in Johnstown

See the weather trend as well as the moving average line

May weather in Johnstown day by day

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Date Weather Temperatures Rain UV More
May 1 Moderate rain at times
Moderate rain at times
24° /10° 5.3 mm 5
May 2 Moderate rain at times
Moderate rain at times
23° /15° 7 mm 4
May 3 Moderate rain at times
Moderate rain at times
21° /14° 5.3 mm 3
May 4 Heavy rain at times
Heavy rain at times
18° /11° 6.6 mm 2
May 5 Moderate or heavy rain shower
Moderate or heavy rain shower
19° /11° 7 mm 2
May 6 Moderate rain at times
Moderate rain at times
15° /9° 4.1 mm 2
May 7 Patchy rain possible
Patchy rain possible
17° /10° 3.8 mm 3
May 8 Moderate rain at times
Moderate rain at times
18° /9° 1.6 mm 3
May 9 Patchy rain possible
Patchy rain possible
11° /5° 6.5 mm 2
May 10 Partly cloudy
Partly cloudy
18° /3° 0 mm 10
May 11 Sunny
Sunny
21° /9° 0 mm 10
May 12 Overcast
Overcast
22° /10° 0.8 mm 5
May 13 Moderate or heavy rain shower
Moderate or heavy rain shower
18° /14° 25.9 mm 2
May 14 Patchy rain possible
Patchy rain possible
19° /14° 3.2 mm 2
May 15 Patchy rain possible
Patchy rain possible
24° /14° 0.1 mm 8
May 16 Moderate or heavy rain shower
Moderate or heavy rain shower
25° /16° 5.8 mm 6
May 17 Patchy rain possible
Patchy rain possible
23° /13° 3.9 mm 2
May 18 Patchy rain possible
Patchy rain possible
17° /11° 0.6 mm 4
May 19 Patchy rain possible
Patchy rain possible
14° /8° 0.3 mm 4
May 20 Overcast
Overcast
16° /4° 0.3 mm 3
May 21 Moderate or heavy rain shower
Moderate or heavy rain shower
14° /9° 23.1 mm 2
May 22 Moderate or heavy rain shower
Moderate or heavy rain shower
11° /7° 20.1 mm 2
May 23 Heavy rain at times
Heavy rain at times
10° /6° 7.9 mm 2
May 24 Patchy rain possible
Patchy rain possible
12° /6° 0.5 mm 2
May 25 Overcast
Overcast
15° /6° 0 mm 6
May 26 Cloudy
Cloudy
18° /6° 0 mm 10
May 27 Heavy rain at times
Heavy rain at times
17° /8° 4.3 mm 3
May 28 Light rain
Light rain
9° /8° 20.1 mm 2
May 29 Fog
Fog
17° /10° 0 mm 2
May 30 Moderate rain
Moderate rain
16° /12° 32.8 mm 2
May 31 Thundery outbreaks possible
Thundery outbreaks possible
14° /8° 0 mm 2
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Important Notice
Our weather forecast for Johnstown 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 Johnstown forecast closer to your planned date for the most up-to-date weather information.

Johnstown in May - FAQ

What are the expected maximum and minimum temperatures in Johnstown during May?

Enjoy moderate daytime temperatures of up to 17° and cooler nights around 10°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in Johnstown during May?

Significant rainfall exceeding 197 mm is expected in Johnstown during May, occurring over more than 24 days. Preparing for wet conditions is recommended in your planning.

What are the typical wind conditions in Johnstown during May?

The average wind speed in Johnstown during May is 18 km/h, suggesting breezy to windy conditions, depending on your activities.

May rainfall patterns in Johnstown

Explore the daily rainfall trends and prepare for Johnstowns May weather 💧
Typically, Johnstown has 24 rainy days in May with a total of 197 mm of rainfall.

UV exposure in Johnstown during May

Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️

Quick links

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Location coordinates Where is Johnstown?

Get accurate weather forecasts for Johnstown, located at latitude 40.327 and longitude -78.922. Stay updated with localized weather information tailored for Johnstown.

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