Perkiomen Creek at Graterford
7.5 mi- Level
- 1.1 ft
- Flow
- 94 cfs
Forecast peak 1.1 ft Sat 8 PM
Reading from Sat 4:15 PM · NWS gauge page
Appearance
Observed 5:40 PM EDT at KPTW
Sunny and 59°15°.
Today: low 31°−1° (likely 30°−1° to 33°1°), high 62°17° (likely 61°16° to 62°17°).
Now 59°15°
Sunny
No precipitation expected in the next 2 hours.
From forecast models
| Hour | Conditions | Temperature | Feels like | Precipitation | Wind | Humidity | Cloud cover | UV index |
|---|---|---|---|---|---|---|---|---|
| Sat 6p | Clear | 58°14° (likely 55°13° to 58°14°) | 58°14° | 0% | 0 mph0 km/h, gusts 2 mph2 km/h | 44% | 1% | 0 |
| Sat 7p | Clear | 52°11° (likely 52°11° to 53°12°) | 52°11° | 0% | 0 mph0 km/h, gusts 1 mph2 km/h | 52% | 1% | 0 |
| Sat 8p | Clear | 45°7° (likely 45°7° to 51°11°) | 45°7° | 0% | 0 mph0 km/h, gusts 2 mph3 km/h | 65% | 0% | 0 |
| Sat 9p | Clear | 43°6° (likely 43°6° to 50°10°) | 43°6° | 0% | 0 mph0 km/h, gusts 2 mph4 km/h | 67% | 3% | 0 |
| Sat 10p | Clear | 40°4° (likely 40°4° to 48°9°) | 40°4° | 0% | 0 mph0 km/h, gusts 3 mph5 km/h | 76% | 5% | 0 |
| Sat 11p | Clear | 38°3° (likely 38°3° to 46°8°) | 38°3° | 0% | 0 mph0 km/h, gusts 3 mph4 km/h | 82% | 5% | 0 |
| Sun 12a | Clear | 37°3° (likely 37°3° to 45°7°) | 37°3° | 0% | 0 mph0 km/h, gusts 3 mph5 km/h | 85% | 3% | 0 |
| Sun 1a | Clear | 35°2° (likely 35°2° to 43°6°) | 35°2° | 0% | 0 mph0 km/h, gusts 3 mph5 km/h | 92% | 2% | 0 |
| Sun 2a | Clear | 34°1° (likely 34°1° to 42°6°) | 34°1° | 0% | 0 mph0 km/h, gusts 3 mph4 km/h | 96% | 0% | 0 |
| Sun 3a | Clear | 33°1° (likely 33°1° to 41°5°) | 33°1° | 0% | 0 mph0 km/h, gusts 3 mph5 km/h | 96% | 0% | 0 |
| Sun 4a | Clear | 33°1° (likely 33°1° to 41°5°) | 33°1° | 0% | 0 mph0 km/h, gusts 4 mph6 km/h | 96% | 0% | 0 |
| Sun 5a | Clear | 32°0° (likely 32°0° to 40°4°) | 32°0° | 0% | 0 mph0 km/h, gusts 3 mph5 km/h | 100% | 0% | 0 |
| Sun 6a | Clear | 32°0° (likely 32°0° to 38°3°) | 32°0° | 0% | 0 mph0 km/h, gusts 3 mph5 km/h | 100% | 0% | 0 |
| Sun 7a | Sunny | 31°−1° (likely 31°−1° to 38°3°) | 31°−1° | 0% | 0 mph0 km/h, gusts 2 mph4 km/h | 100% | 0% | 0 |
| Sun 8a | Sunny | 33°1° (likely 33°1° to 37°3°) | 33°1° | 0% | 0 mph0 km/h, gusts 3 mph4 km/h | 100% | 0% | 0 |
| Sun 9a | Sunny | 42°6° (likely 38°3° to 43°6°) | 42°6° | 0% | 0 mph0 km/h, gusts 3 mph5 km/h | 76% | 0% | 1 |
| Sun 10a | Sunny | 52°11° (likely 49°9° to 52°11°) | 52°11° | 0% | 0 mph0 km/h, gusts 3 mph4 km/h | 61% | 0% | 2 |
| Sun 11a | Sunny | 57°14° (likely 55°13° to 57°14°) | 57°14° | 0% | 0 mph0 km/h, gusts 5 mph8 km/h | 51% | 1% | 3 |
| Sun 12p | Sunny | 60°16° (likely 59°15° to 61°16°) | 60°16° | 0% | 0 mph0 km/h, gusts 6 mph10 km/h | 47% | 1% | 4 |
| Sun 1p | Sunny | 62°17° (likely 61°16° to 63°17°) | 62°17° | 0% | 0 mph0 km/h, gusts 7 mph11 km/h | 43% | 1% | 4 |
| Sun 2p | Sunny | 64°18° (likely 62°17° to 64°18°) | 64°18° | 0% | 5 mph8 km/h from W, gusts 7 mph11 km/h | 40% | 0% | 4 |
| Sun 3p | Sunny | 65°18° (likely 63°17° to 65°18°) | 65°18° | 0% | 0 mph0 km/h, gusts 6 mph10 km/h | 38% | 2% | 3 |
| Sun 4p | Sunny | 65°18° (likely 62°17° to 65°18°) | 65°18° | 0% | 0 mph0 km/h, gusts 7 mph11 km/h | 40% | 2% | 2 |
| Sun 5p | Sunny | 64°18° (likely 61°16° to 64°18°) | 64°18° | 0% | 0 mph0 km/h, gusts 6 mph9 km/h | 43% | 0% | 1 |
| Sun 6p | Clear | 59°15° (likely 56°13° to 59°15°) | 59°15° | 0% | 0 mph0 km/h, gusts 5 mph8 km/h | 53% | 0% | 0 |
| Sun 7p | Clear | 53°12° (likely 52°11° to 54°12°) | 53°12° | 0% | 0 mph0 km/h, gusts 5 mph9 km/h | 66% | 0% | 0 |
| Sun 8p | Clear | 46°8° (likely 46°8° to 52°11°) | 46°8° | 0% | 0 mph0 km/h, gusts 6 mph9 km/h | 83% | 0% | 0 |
| Sun 9p | Clear | 42°6° (likely 42°6° to 50°10°) | 42°6° | 0% | 0 mph0 km/h, gusts 5 mph8 km/h | 93% | 13% | 0 |
| Sun 10p | Clear | 40°4° (likely 40°4° to 48°9°) | 40°4° | 0% | 0 mph0 km/h, gusts 3 mph5 km/h | 100% | 13% | 0 |
| Sun 11p | Clear | 39°4° (likely 39°4° to 46°8°) | 39°4° | 0% | 0 mph0 km/h, gusts 3 mph5 km/h | 100% | 12% | 0 |
| Mon 12a | Clear | 37°3° (likely 37°3° to 45°7°) | 37°3° | 0% | 0 mph0 km/h, gusts 4 mph6 km/h | 100% | 12% | 0 |
| Mon 1a | Clear | 37°3° (likely 37°3° to 44°7°) | 37°3° | 0% | 0 mph0 km/h, gusts 3 mph5 km/h | 100% | 17% | 0 |
| Mon 2a | Clear | 36°2° (likely 36°2° to 42°6°) | 36°2° | 0% | 0 mph0 km/h, gusts 3 mph5 km/h | 100% | 16% | 0 |
| Mon 3a | Clear | 35°2° (likely 35°2° to 41°5°) | 35°2° | 0% | 0 mph0 km/h, gusts 4 mph6 km/h | 100% | 14% | 0 |
| Mon 4a | Clear | 35°2° (likely 35°2° to 41°5°) | 35°2° | 0% | 0 mph0 km/h, gusts 3 mph5 km/h | 100% | 16% | 0 |
| Mon 5a | Clear | 35°2° (likely 35°2° to 41°5°) | 35°2° | 0% | 0 mph0 km/h, gusts 4 mph7 km/h | 100% | 16% | 0 |
| Mon 6a | Clear | 35°2° (likely 34°1° to 40°4°) | 35°2° | 0% | 0 mph0 km/h, gusts 5 mph8 km/h | 100% | 18% | 0 |
| Mon 7a | Partly sunny | 35°2° (likely 33°1° to 40°4°) | 35°2° | 0% | 0 mph0 km/h, gusts 5 mph9 km/h | 100% | 30% | 0 |
| Mon 8a | Mostly sunny | 35°2° (likely 34°1° to 41°5°) | 35°2° | 0% | 0 mph0 km/h, gusts 6 mph10 km/h | 100% | 44% | 0 |
| Mon 9a | Partly sunny | 46°8° (likely 41°5° to 46°8°) | 46°8° | 0% | 0 mph0 km/h, gusts 6 mph9 km/h | 79% | 53% | 1 |
| Mon 10a | Mostly sunny | 53°12° (likely 51°11° to 54°12°) | 53°12° | 0% | 0 mph0 km/h, gusts 10 mph17 km/h | 66% | 25% | 2 |
| Mon 11a | Sunny | 58°14° (likely 57°14° to 59°15°) | 58°14° | 0% | 5 mph8 km/h from W, gusts 11 mph17 km/h | 64% | 9% | 3 |
| Mon 12p | Sunny | 62°17° (likely 60°16° to 63°17°) | 62°17° | 0% | 5 mph8 km/h from W, gusts 12 mph20 km/h | 56% | 7% | 4 |
| Mon 1p | Sunny | 65°18° (likely 63°17° to 66°19°) | 65°18° | 0% | 5 mph8 km/h from W, gusts 12 mph19 km/h | 50% | 0% | 4 |
| Mon 2p | Sunny | 67°19° (likely 65°18° to 68°20°) | 67°19° | 0% | 5 mph8 km/h from W, gusts 12 mph19 km/h | 49% | 1% | 4 |
| Mon 3p | Sunny | 68°20° (likely 64°18° to 69°21°) | 68°20° | 0% | 5 mph8 km/h from W, gusts 13 mph21 km/h | 47% | 7% | 3 |
| Mon 4p | Sunny | 69°21° (likely 65°18° to 69°21°) | 69°21° | 0% | 5 mph8 km/h from W, gusts 14 mph22 km/h | 47% | 1% | 2 |
| Mon 5p | Sunny | 67°19° (likely 63°17° to 67°19°) | 67°19° | 0% | 5 mph8 km/h from W, gusts 12 mph20 km/h | 52% | 0% | 1 |
Evening
6 PM–midnight
Dry
Overnight
midnight–6 AM
Dry
Official NWS forecast
Tonight: Clear, with a low around 31. West wind around 0 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
Dry
Evening
6 PM–midnight
Dry
Overnight
midnight–6 AM
Dry
Official NWS forecast
Day: Sunny, with a high near 66. West wind 0 to 5 mph.
Night: Mostly clear, with a low around 35. West wind around 0 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
Dry
Evening
6 PM–midnight
Dry
Overnight
midnight–6 AM
Dry
Official NWS forecast
Day: Sunny, with a high near 69. West wind 0 to 5 mph.
Night: Clear, with a low around 43. Northwest wind 0 to 5 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
Dry
Evening
6 PM–midnight
Dry
Overnight
midnight–6 AM
Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 64.
Night: Mostly clear, with a low around 37.
Forecasts agreeIndependent forecasts are close; the range is narrow.
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
Dry
Evening
6 PM–midnight
Dry
Overnight
midnight–6 AM
Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 63.
Night: Partly cloudy, with a low around 42.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
Dry
Evening
6 PM–midnight
Dry
Overnight
midnight–6 AM
Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 70.
Night: Mostly clear, with a low around 47.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
Dry
Evening
6 PM–midnight
Dry
Overnight
midnight–6 AM
Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 73.
Night: Mostly clear, with a low around 47.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
Dry
Evening
6 PM–midnight
Dry
Overnight
midnight–6 AM
Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 70.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
20% chance
Evening
6 PM–midnight
30% chance · 0.04 in1 mm
Overnight
midnight–6 AM
40% chance · 0.14 in3.6 mm
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
Morning
6 AM–noon
30% chance · 0.12 in3 mm
Afternoon
noon–6 PM
30% chance · 0.1 in2.6 mm
Evening
6 PM–midnight
20% chance · 0.03 in0.6 mm
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
Dry, high 62°, low 31°.
Dry, high 66°, low 35°, warming up.
Dry, high 69°, low 43°, warming up.
Mostly dry, highs 63–73°.
Want the meteorologists’ reasoning? Read the NWS forecast discussion (PHI) (opens in a new tab)
No meaningful changes from yesterday’s forecast.
Forecast peak 1.1 ft Sat 8 PM
Reading from Sat 4:15 PM · NWS gauge page
Forecast peak 2.0 ft Sat 8 PM
Reading from Sat 4:15 PM · NWS gauge page
Forecast peak 8.1 ft Sat 8 PM
Reading from Sat 4:30 PM · NWS gauge page
Forecast peak 1.6 ft Sat 8 PM
Reading from Sat 5:15 PM · NWS gauge page
What this week’s weather means for heating, cooling, pipes and fresh air.
About 62% less heating than a typical week.
Heating degree days, base 65°F
47, 17 and 5°F are the test points heat pumps are rated at. About 22 hours are near freezing and damp, when outdoor units defrost more often.
Dry air outside (dew point 35°F).
Sun, 12:00 PM–5:00 PM
Good stretch to open the windows.
Today’s expected high is 2°1° colder than typical.
On average 1° colder than normal (daily mean temperature).
Green Lane weather by month: normals, records, snow and freeze dates
Sunrise 7:22 AM, sunset 6:08 PM.
Clear 6:36 PM–6:55 AM, but the moon is 99% lit and up.
Waxing gibbous
98% lit · growing