Norristown Weather in May
What's the weather like in Norristown (Pennsylvania) in May 2025?
The climate in Norristown during May can be summarized as mild and damp.
May is in the spring in Norristown and is typically the 5th warmest month of the year. Daytime maximum temperatures average around a comfortable 23°C (73°F), whilst at night 11°C (51°F) is normal.
| Daytime temperature | 22.8°C 73°F |
|---|---|
| Nightly temperature | 10.6°C 51.1°F |
| Average temperature | 16.7°C 62.1°F |
| Daily sunshine | 8.5 hrs |
| Avg rainfall | 109 mm 4.3 ins |
| Rainy days | 12 days |
| Sea temperature | 9.9°C 49.8°F |
| Humidity | 66% |
| Windspeed | 15.8kph 10 mph |
On average May is the 2nd wettest month of the year in Norristown with around 109mm 4.3 inches of rain making it a damp time to visit. This rainfall is typically spread over 12 days, although this may vary considerably.
On the flip side this corresponds to an average of 8.5 hours of sunshine per day.
May temperatures in Norristown
May rainfall
May hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Norristown in May 2025.
Other monthly averages
Norristown weather stats
| Hottest month: | July | 29.6°C 85.3°F |
|---|---|---|
| Driest month: | February | 75mm 3ins |
| Sunniest month: | July | 9.6hrs |
| Coldest month: | January | 3°C 37.4°F |
| Wettest month: | July | 113mm 4.4ins |
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