Johnstown 7-day weather forecast

Written by:
September 8, 2025
ESOlex // Shutterstock

Johnstown 7-day weather forecast

Stacker created the forecast for Johnstown, Pennsylvania using data from OpenWeather. This week's high is 82 °F on Saturday, while the low is 43 °F on Monday. There are expected to be 5 sunny days and rain on 1 day this week.

NWS State College PA has issued a frost advisory until Monday at 08:00 AM.

Monday, September 8

- High of 72 °F, low of 43 °F (34% humidity)
- Sunny with a 0% chance of rain
- High risk of harm from sun exposure (7 UV index)
- Light breeze (4 mph wind)
- Sunrise at 6:50 AM, sunset at 7:36 PM
1 / 6
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Tuesday, September 9

- High of 74 °F, low of 48 °F (35% humidity)
- Sunny with a 0% chance of rain
- High risk of harm from sun exposure (7 UV index)
- Gentle breeze (9 mph wind)
- Sunrise at 6:51 AM, sunset at 7:35 PM
2 / 6
Hellame // Shutterstock

Wednesday, September 10

- High of 78 °F, low of 50 °F (34% humidity)
- Overcast with a 0% chance of rain
- High risk of harm from sun exposure (6 UV index)
- Light breeze (5 mph wind)
- Sunrise at 6:52 AM, sunset at 7:33 PM
3 / 6
afoto6267 // Shutterstock

Thursday, September 11

- High of 78 °F, low of 52 °F (32% humidity)
- Sunny with a 0% chance of rain
- High risk of harm from sun exposure (6 UV index)
- Light breeze (6 mph wind)
- Sunrise at 6:52 AM, sunset at 7:31 PM
4 / 6
Pablesku // Shutterstock

Friday, September 12

- High of 80 °F, low of 56 °F (35% humidity)
- Sunny with a 0% chance of rain
- Light breeze (5 mph wind)
- Sunrise at 6:53 AM, sunset at 7:30 PM
5 / 6
AnnaElizabeth photography // Shutterstock

Saturday, September 13

- High of 82 °F, low of 57 °F (36% humidity)
- Sunny with a 0% chance of rain
- Light breeze (6 mph wind)
- Sunrise at 6:54 AM, sunset at 7:28 PM
6 / 6
Valeriy Boyarskiy // Shutterstock

Sunday, September 14

- High of 77 °F, low of 59 °F (70% humidity)
- Overcast with a 100% chance of rain (1 mm of rain)
- Gentle breeze (8 mph wind)
- Sunrise at 6:55 AM, sunset at 7:26 PM
- Last quarter moon

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