South Londonderry, PA Weather Forecast for 5-Days

Updated: Mon May 18th 2026 9:30 PM EDT

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South Londonderry, PA Weather – 5-18 – Sunny
99° / 64°
Sunny
In South Londonderry, bright and sunny conditions with highs near 99°F and lows around 64°F. Wind will be moderate, blowing around 14mph on average and gusts of 10.3mph at 11 PM. Humidity levels should be comfortable, sitting around 54% on average, the maximum being 55% at 11 PM and 50% being its lowest at 10 PM. Barometric pressure is its highest of 30.15inHg at 11 PM, a lowest point of 30.12inHg at 10 PM with an avg 30.14inHg.
South Londonderry, PA Weather – 5-19 – Sunny
88° / 65°

Weather Tomorrow

Sunny
In South Londonderry, it will be sunny with highs near 88°F and lows around 65°F. Wind will be moderate, blowing around 13mph on average and gusts of 15.8mph at 3 PM. The humidity will be on the higher side, averaging about 67%, the maximum being 87% at 7 AM and 52% being its lowest at 2 PM. Barometric pressure is its highest of 30.15inHg at 12 AM, a lowest point of 30.03inHg at 11 PM with an avg 30.09inHg.
South Londonderry, PA Weather – 5-20 – Moderate Rain
86° / 60°
Moderate Rain
Daytime highs will reach 86°F with lows dropping to 60°F in South Londonderry, where it will rain at times. The chance of rain is 82% with an estimated 0.22in. Wind will be moderate, blowing around 13mph on average and gusts of 18.8mph at 4 PM. The humidity will be on the higher side, averaging about 76%, the maximum being 92% at 8 PM and 54% being its lowest at 3 PM. Barometric pressure is its highest of 30.12inHg at 10 PM, a lowest point of 29.95inHg at 4 PM with an avg 30.03inHg.
South Londonderry, PA Weather – 5-21 – Moderate Rain
55° / 50°
Moderate Rain
In South Londonderry, rain is likely with a high near 55°F and a low around 50°F. The chance of rain is 84% with an estimated 0.37in. Winds will be light at 9mph and gusts of 18.2mph at 12 AM. High humidity with average of 85% is anticipated, the maximum being 98% at 11 PM and 73% being its lowest at 12 PM. Barometric pressure is its highest of 30.32inHg at 10 PM, a lowest point of 30.13inHg at 12 AM with an avg 30.25inHg.
South Londonderry, PA Weather – 5-22 – Heavy Rain
50° / 49°
Heavy Rain
In South Londonderry, rain is likely with a high near 50°F and a low around 49°F. The chance of rain is 83% with an estimated 0.8in. Winds will be light at 10mph and gusts of 13.3mph at 6 PM. High humidity with average of 97% is anticipated, the maximum being 98% at 11 PM and 95% being its lowest at 10 AM. Barometric pressure is its highest of 30.32inHg at 9 AM, a lowest point of 30.28inHg at 6 PM with an avg 30.3inHg.
South Londonderry, PA Weather – 5-23 – Heavy Rain
49° / 48°
Heavy Rain
In South Londonderry, it will rain at times with highs near 49°F and lows around 48°F. Rainfall predicted to have a 60% chance with an estimated 0.8in. Wind will be moderate, blowing around 15mph on average and gusts of 21.7mph at 5 PM. High humidity with average of 98% is anticipated, the maximum being 98% at 11 PM and 96% being its lowest at 11 AM. Barometric pressure is its highest of 30.34inHg at 11 AM, a lowest point of 30.27inHg at 6 PM with an avg 30.31inHg.

Currently

Clear 87°F
30.05 inHg.
Barometer
48%
Humidity
SSW 6.1 mph
Wind
Clear

5 Day Forecast Nearby

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