Antietam Creek near Sharpsburg
8.5 mi- Level
- 2.4 ft
- Flow
- 100 cfs
Forecast peak 2.3 ft Sat 8 PM
Reading from Sat 5:15 PM · NWS gauge page
Observed 5:54 PM EDT at KRSP
San Mar, MD weather
Sunny and 51°11°.
Today: low 36°2° (likely 36°2° to 40°4°), high 60°16° (likely 59°15° to 62°17°).
Now 51°11°
Sunny
- Wind
- 5 mph8 km/h
- From the east. Up to 5 mph8 km/h through 7 AM
- Dew point
- 45°7°
- Comfortable · down to 37°3° by 3 AM
- UV tomorrow
- 4Moderate
- Moderate 11 AM–5 PM · peak 4
- Air quality
- 34Good
- Ozone · tomorrow moderate
Next 2 hours
No precipitation expected in the next 2 hours.
From forecast models
Next 48 hours
About the same as this time yesterday (52°11° then, 51°11° now)
Good hours for
TonightDown to 39°4° by 4 AM · Clear
Tomorrow morningUp to 53°12° by 11 AM · Clear
Tomorrow afternoonUp to 63°17° by 3 PM · Clear
Tomorrow nightDown to 40°4° by 4 AM · Clear
Monday morningUp to 53°12° by 11 AM · Clear
Monday afternoonUp to 68°20° by 3 PM · Clear
| Hour | Conditions | Temperature | Feels like | Precipitation | Wind | Humidity | Cloud cover | UV index |
|---|---|---|---|---|---|---|---|---|
| Sat 7p | Clear | 52°11° (likely 50°10° to 54°12°) | 52°11° | 0% | 5 mph8 km/h from E, gusts 5 mph8 km/h | 59% | 1% | 0 |
| Sat 8p | Clear | 49°9° (likely 48°9° to 52°11°) | 48°9° | 0% | 3 mph5 km/h from E, gusts 6 mph10 km/h | 66% | 1% | 0 |
| Sat 9p | Clear | 48°9° (likely 47°8° to 52°11°) | 46°8° | 0% | 5 mph8 km/h from SE, gusts 7 mph11 km/h | 68% | 1% | 0 |
| Sat 10p | Clear | 47°8° (likely 47°8° to 51°11°) | 45°7° | 0% | 5 mph8 km/h from SE, gusts 8 mph12 km/h | 71% | 0% | 0 |
| Sat 11p | Clear | 46°8° (likely 46°8° to 51°11°) | 44°7° | 0% | 5 mph8 km/h from SE, gusts 8 mph13 km/h | 73% | 2% | 0 |
| Sun 12a | Clear | 45°7° (likely 45°7° to 50°10°) | 44°7° | 0% | 3 mph5 km/h from SE, gusts 8 mph12 km/h | 76% | 0% | 0 |
| Sun 1a | Clear | 44°7° (likely 44°7° to 50°10°) | 42°6° | 0% | 3 mph5 km/h from SE, gusts 8 mph12 km/h | 82% | 0% | 0 |
| Sun 2a | Clear | 41°5° (likely 41°5° to 49°9°) | 39°4° | 0% | 3 mph5 km/h from SE, gusts 7 mph11 km/h | 89% | 10% | 0 |
| Sun 3a | Clear | 40°4° (likely 40°4° to 48°9°) | 40°4° | 0% | 2 mph3 km/h from SE, gusts 7 mph10 km/h | 89% | 8% | 0 |
| Sun 4a | Clear | 39°4° (likely 39°4° to 48°9°) | 39°4° | 0% | 2 mph3 km/h from SE, gusts 6 mph10 km/h | 92% | 7% | 0 |
| Sun 5a | Clear | 39°4° (likely 39°4° to 47°8°) | 39°4° | 0% | 2 mph3 km/h from SE, gusts 5 mph7 km/h | 92% | 7% | 0 |
| Sun 6a | Clear | 39°4° (likely 39°4° to 45°7°) | 39°4° | 0% | 1 mph2 km/h from S, gusts 3 mph4 km/h | 92% | 7% | 0 |
| Sun 7a | Clear | 38°3° (likely 38°3° to 46°8°) | 38°3° | 0% | 2 mph3 km/h from SE, gusts 3 mph5 km/h | 96% | 1% | 0 |
| Sun 8a | Sunny | 39°4° (likely 39°4° to 45°7°) | 39°4° | 0% | 2 mph3 km/h from SE, gusts 3 mph5 km/h | 92% | 3% | 0 |
| Sun 9a | Sunny | 42°6° (likely 42°6° to 49°9°) | 42°6° | 0% | 1 mph2 km/h from S, gusts 3 mph5 km/h | 89% | 7% | 1 |
| Sun 10a | Sunny | 48°9° (likely 48°9° to 54°12°) | 48°9° | 0% | 1 mph2 km/h from S, gusts 6 mph9 km/h | 80% | 6% | 2 |
| Sun 11a | Sunny | 53°12° (likely 53°12° to 57°14°) | 53°12° | 0% | 1 mph2 km/h from SW, gusts 7 mph11 km/h | 69% | 4% | 3 |
| Sun 12p | Sunny | 57°14° (likely 57°14° to 59°15°) | 57°14° | 0% | 2 mph3 km/h from S, gusts 8 mph13 km/h | 62% | 9% | 4 |
| Sun 1p | Sunny | 60°16° (likely 60°16° to 62°17°) | 60°16° | 0% | 3 mph5 km/h from S, gusts 8 mph13 km/h | 55% | 9% | 4 |
| Sun 2p | Sunny | 62°17° (likely 61°16° to 63°17°) | 62°17° | 0% | 3 mph5 km/h from S, gusts 8 mph13 km/h | 52% | 10% | 4 |
| Sun 3p | Sunny | 63°17° (likely 61°16° to 63°17°) | 63°17° | 0% | 3 mph5 km/h from S, gusts 8 mph13 km/h | 48% | 10% | 4 |
| Sun 4p | Sunny | 62°17° (likely 61°16° to 64°18°) | 62°17° | 0% | 3 mph5 km/h from S, gusts 8 mph12 km/h | 52% | 9% | 3 |
| Sun 5p | Sunny | 62°17° (likely 60°16° to 63°17°) | 62°17° | 0% | 3 mph5 km/h from S, gusts 7 mph11 km/h | 52% | 3% | 1 |
| Sun 6p | Clear | 58°14° (likely 56°13° to 59°15°) | 58°14° | 0% | 2 mph3 km/h from S, gusts 7 mph11 km/h | 59% | 0% | 0 |
| Sun 7p | Clear | 55°13° (likely 53°12° to 56°13°) | 55°13° | 0% | 2 mph3 km/h from SE, gusts 5 mph8 km/h | 64% | 2% | 0 |
| Sun 8p | Clear | 50°10° (likely 50°10° to 54°12°) | 50°10° | 0% | 2 mph3 km/h from SE, gusts 6 mph9 km/h | 77% | 0% | 0 |
| Sun 9p | Clear | 49°9° (likely 49°9° to 53°12°) | 49°9° | 0% | 2 mph3 km/h from SE, gusts 6 mph9 km/h | 77% | 0% | 0 |
| Sun 10p | Clear | 48°9° (likely 48°9° to 52°11°) | 48°9° | 0% | 2 mph3 km/h from SE, gusts 5 mph9 km/h | 80% | 0% | 0 |
| Sun 11p | Clear | 46°8° (likely 46°8° to 52°11°) | 46°8° | 0% | 2 mph3 km/h from SE, gusts 5 mph9 km/h | 86% | 1% | 0 |
| Mon 12a | Clear | 44°7° (likely 44°7° to 51°11°) | 44°7° | 0% | 2 mph3 km/h from S, gusts 6 mph10 km/h | 89% | 11% | 0 |
| Mon 1a | Clear | 43°6° (likely 43°6° to 51°11°) | 43°6° | 0% | 1 mph2 km/h from S, gusts 5 mph8 km/h | 93% | 4% | 0 |
| Mon 2a | Clear | 43°6° (likely 43°6° to 49°9°) | 43°6° | 0% | 1 mph2 km/h from S, gusts 5 mph7 km/h | 93% | 2% | 0 |
| Mon 3a | Clear | 42°6° (likely 42°6° to 48°9°) | 42°6° | 0% | 1 mph2 km/h from S, gusts 4 mph6 km/h | 93% | 2% | 0 |
| Mon 4a | Clear | 40°4° (likely 40°4° to 48°9°) | 40°4° | 0% | 1 mph2 km/h from S, gusts 3 mph6 km/h | 100% | 2% | 0 |
| Mon 5a | Clear | 40°4° (likely 40°4° to 46°8°) | 40°4° | 0% | 1 mph2 km/h from S, gusts 2 mph4 km/h | 100% | 12% | 0 |
| Mon 6a | Mostly clear | 39°4° (likely 39°4° to 46°8°) | 39°4° | 0% | 1 mph2 km/h from S, gusts 5 mph7 km/h | 100% | 20% | 0 |
| Mon 7a | Clear | 38°3° (likely 38°3° to 45°7°) | 38°3° | 0% | 1 mph2 km/h from S, gusts 4 mph7 km/h | 100% | 32% | 0 |
| Mon 8a | Sunny | 39°4° (likely 38°3° to 44°7°) | 39°4° | 0% | 1 mph2 km/h from NW, gusts 4 mph6 km/h | 96% | 36% | 0 |
| Mon 9a | Sunny | 42°6° (likely 41°5° to 48°9°) | 42°6° | 0% | 1 mph2 km/h from W, gusts 4 mph6 km/h | 93% | 33% | 1 |
| Mon 10a | Mostly sunny | 47°8° (likely 47°8° to 52°11°) | 47°8° | 0% | 2 mph3 km/h from W, gusts 7 mph11 km/h | 83% | 17% | 2 |
| Mon 11a | Sunny | 53°12° (likely 53°12° to 56°13°) | 53°12° | 0% | 2 mph3 km/h from W, gusts 7 mph12 km/h | 71% | 0% | 3 |
| Mon 12p | Sunny | 58°14° (likely 57°14° to 60°16°) | 58°14° | 0% | 3 mph5 km/h from NW, gusts 8 mph13 km/h | 59% | 0% | 4 |
| Mon 1p | Sunny | 62°17° (likely 61°16° to 64°18°) | 62°17° | 0% | 5 mph8 km/h from NW, gusts 8 mph13 km/h | 54% | 0% | 4 |
| Mon 2p | Sunny | 65°18° (likely 64°18° to 66°19°) | 65°18° | 0% | 6 mph10 km/h from NW, gusts 9 mph15 km/h | 52% | 1% | 4 |
| Mon 3p | Sunny | 68°20° (likely 65°18° to 68°20°) | 68°20° | 0% | 7 mph11 km/h from NW, gusts 11 mph17 km/h | 49% | 0% | 4 |
| Mon 4p | Sunny | 68°20° (likely 65°18° to 69°21°) | 68°20° | 0% | 3 mph5 km/h from NW, gusts 11 mph17 km/h | 51% | 0% | 3 |
| Mon 5p | Sunny | 68°20° (likely 64°18° to 68°20°) | 68°20° | 0% | 3 mph5 km/h from NW, gusts 9 mph14 km/h | 52% | 0% | 1 |
| Mon 6p | Clear | 65°18° (likely 60°16° to 65°18°) | 65°18° | 0% | 3 mph5 km/h from NW, gusts 4 mph7 km/h | 56% | 0% | 0 |
Days ahead
Shaded: typical range for these dates (1991–2020)
Today, Oct 24. Sunny. High 60°16°, low 36°2°. Typical 62°17° / 41°5°. Dry. Mostly agree.
Evening
6 PM–midnight
Clear, 49°9°Dry
Overnight
midnight–6 AM
Clear, 39°4°Dry
Official NWS forecast
Tonight: Clear, with a low around 36. Southeast wind around 5 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
- High, likely
- 59°15°–62°17°
- Low, likely
- 36°2°–40°4°
- Typical high / low
- 62°17° / 41°5°
- Wind
- 8 mph13 km/h, gusts 15 mph24 km/h
- UV peak
- 4
Tomorrow, Oct 25. Sunny. High 63°17°, low 37°3°. Typical 62°17° / 41°5°. Dry. Forecasts agree.
Morning
6 AM–noon
Sunny, 39°4°Dry
Afternoon
noon–6 PM
Sunny, 63°17°Dry
Evening
6 PM–midnight
Clear, 50°10°Dry
Overnight
midnight–6 AM
Clear, 40°4°Dry
Official NWS forecast
Day: Sunny, with a high near 63. South wind around 3 mph.
Night: Mostly clear, with a low around 37. South wind around 2 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
- High, likely
- 61°16°–64°18°
- Low, likely
- 37°3°–45°7°
- Typical high / low
- 62°17° / 41°5°
- Wind
- 8 mph13 km/h
- UV peak
- 4
Monday, Oct 26. Mostly sunny. High 69°21°, low 46°8°. Typical 62°17° / 41°5°. Dry. Mostly agree.
Morning
6 AM–noon
Sunny, 39°4°Dry
Afternoon
noon–6 PM
Sunny, 68°20°Dry
Evening
6 PM–midnight
Clear, 55°13°Dry
Overnight
midnight–6 AM
Clear, 47°8°Dry
Official NWS forecast
Day: Sunny, with a high near 69. West wind 1 to 7 mph.
Night: Mostly clear, with a low around 46. Northwest wind around 3 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
- High, likely
- 66°19°–69°21°
- Low, likely
- 38°3°–46°8°
- Typical high / low
- 62°17° / 41°5°
- Wind
- 8 mph12 km/h, gusts 13 mph21 km/h
- UV peak
- 4
Tuesday, Oct 27. Cloudy. High 66°19°, low 42°6°. Typical 61°16° / 40°4°. Dry. Mostly agree.
Morning
6 AM–noon
Sunny, 47°8°Dry
Afternoon
noon–6 PM
Partly sunny, 65°19°Dry
Evening
6 PM–midnight
Partly cloudy, 55°13°Dry
Overnight
midnight–6 AM
Partly cloudy, 45°7°Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 66.
Night: Partly cloudy, with a low around 42.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
- High, likely
- 63°17°–67°19°
- Low, likely
- 42°6°–48°9°
- Typical high / low
- 61°16° / 40°4°
- Wind
- 7 mph11 km/h, gusts 16 mph26 km/h
- UV peak
- 4
Wednesday, Oct 28. Cloudy. High 64°18°, low 46°8°. Typical 61°16° / 40°4°. Dry. Forecasts agree.
Morning
6 AM–noon
Mostly sunny, 45°7°Dry
Afternoon
noon–6 PM
Cloudy, 62°17°Dry
Evening
6 PM–midnight
Cloudy, 54°12°Dry
Overnight
midnight–6 AM
Cloudy, 47°9°Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Partly sunny, with a high near 64.
Night: Mostly cloudy, with a low around 46.
Forecasts agreeIndependent forecasts are close; the range is narrow.
- High, likely
- 61°16°–64°18°
- Low, likely
- 42°6°–47°8°
- Typical high / low
- 61°16° / 40°4°
- Wind
- 9 mph15 km/h, gusts 17 mph28 km/h
- UV peak
- 4
Thursday, Oct 29. Partly sunny. High 70°21°, low 48°9°. Typical 60°16° / 40°4°. Dry. Mostly agree.
Morning
6 AM–noon
Sunny, 47°8°Dry
Afternoon
noon–6 PM
Sunny, 68°20°Dry
Evening
6 PM–midnight
Clear, 56°13°Dry
Overnight
midnight–6 AM
Clear, 47°9°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 48.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
- High, likely
- 65°18°–71°22°
- Low, likely
- 44°7°–49°9°
- Typical high / low
- 60°16° / 40°4°
- Wind
- 7 mph11 km/h, gusts 20 mph32 km/h
- UV peak
- 4
Friday, Oct 30. Mostly sunny. High 74°23°, low 50°10°. Typical 60°16° / 39°4°. Dry. Mostly agree.
Morning
6 AM–noon
Sunny, 47°8°Dry
Afternoon
noon–6 PM
Sunny, 73°23°Dry
Evening
6 PM–midnight
Clear, 60°15°Dry
Overnight
midnight–6 AM
Mostly clear, 49°9°Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 74.
Night: Mostly clear, with a low around 50.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
- High, likely
- 71°22°–74°23°
- Low, likely
- 44°7°–50°10°
- Typical high / low
- 60°16° / 39°4°
- Wind
- 8 mph13 km/h, gusts 19 mph30 km/h
- UV peak
- 4
Saturday, Oct 31. Partly sunny. High 71°22°, low 48°9°. Typical 60°16° / 39°4°. Dry. Forecasts differ.
Morning
6 AM–noon
Cloudy, 47°8°Dry
Afternoon
noon–6 PM
Cloudy, 70°21°Dry
Evening
6 PM–midnight
Cloudy, 58°14°Dry
Overnight
midnight–6 AM
Partly cloudy, 53°11°Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 71.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
- High, likely
- 64°18°–71°22°
- Low, likely
- 45°7°–51°11°
- Typical high / low
- 60°16° / 39°4°
- Wind
- 7 mph12 km/h, gusts 18 mph29 km/h
- UV peak
- 4
Sunday, Nov 1. Cloudy. High 66°19°, low 52°11°. Typical 59°15° / 38°3°. Rain 0.04 in1 mm, 30% chance. Forecasts differ.
Morning
6 AM–noon
Cloudy, 56°13°20% chance
Afternoon
noon–6 PM
Cloudy, 65°18°30% chance · 0.02 in0.4 mm
Evening
6 PM–midnight
Drizzle, 61°16°30% chance · 0.12 in3 mm
Overnight
midnight–6 AM
Drizzle, 60°16°30% chance · 0.1 in2.6 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.
- High, likely
- 62°17°–69°21°
- Low, likely
- 48°9°–54°12°
- Typical high / low
- 59°15° / 38°3°
- Wind
- 11 mph18 km/h, gusts 23 mph37 km/h
- UV peak
- 2
Monday, Nov 2. Drizzle. High 69°21°, low 56°13°. Typical 59°15° / 38°3°. Rain 0.74 in19 mm, 30% chance. Forecasts differ.
Morning
6 AM–noon
Drizzle, 62°17°30% chance · 0.04 in1.1 mm
Afternoon
noon–6 PM
Cloudy, 68°20°20% chance · 0.13 in3.2 mm
Evening
6 PM–midnight
Drizzle, 61°16°30% chance · 0.58 in15 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.
- High, likely
- 62°17°–74°23°
- Low, likely
- 50°10°–63°17°
- Typical high / low
- 59°15° / 38°3°
- Wind
- 19 mph30 km/h, gusts 41 mph65 km/h
The outlook
Today
Dry, high 60°, low 36°.
Tomorrow
Dry, high 63°, low 37°, warming up.
Monday
Dry, high 69°, low 46°, warming up.
Rest of week
Mostly dry, highs 64–74°.
Want the meteorologists’ reasoning? Read the NWS forecast discussion (LWX) (opens in a new tab)
What changed since yesterday
No meaningful changes from yesterday’s forecast.
Radar
Radar data: NOAA MRMS, rendered by forecast.blue
Radar loads when scrolled into view
Rivers
NOAA river gauges within 25 mi
Below flood stage
Potomac River at Shepherdstown
12 mi- Level
- 2.6 ft
- Flow
- 2,420 cfs
Forecast peak 2.4 ft Sat 8 PM
Reading from Sat 5:30 PM · NWS gauge page
Conococheague Creek at Fairview
15 mi- Level
- 1.7 ft
- Flow
- 161 cfs
Forecast peak 1.6 ft Sat 8 PM
Reading from Sat 5:15 PM · NWS gauge page
Potomac River at Harpers Ferry
17 mi- Level
- 1.2 ft
- Flow
- 2,500 cfs
Forecast peak 1.1 ft Tue 8 AM
Reading from Sat 4:45 PM · NWS gauge page
For your home
What this week’s weather means for heating, cooling, pipes and fresh air.
Heating this week
About 69% less heating than a typical week.
This week 31Typical 100
Heating degree days, base 65°F
Heat-pump hours, next 7 days
- h below 47°F
- 24
- h below 17°F
- 0
- h below 5°F
- 0
47, 17 and 5°F are the test points heat pumps are rated at. About 15 hours are near freezing and damp, when outdoor units defrost more often.
Comfort
Dry air outside (dew point 45°F).
Open the windows?
Sun, 1:00 PM–5:00 PM
Good stretch to open the windows.
Is this typical?
Hagerstown 1e · official normals 1991–2020 · records 1899–2026
Oct 24, today vs a typical year
Today’s expected high is 2°1° colder than typical.
- Normal high / low
- 62°17° / 41°5°
- Forecast high / low
- 60°16° / 36°2°
- Record high
- 83°28° in 2001
- Record low
- 18°−8° in 1969
Last 7 days vs normal
On average 4°2° colder than normal (daily mean temperature).
- −7°−4°SunOct 18
- −4°−2°MonOct 19
- −2°−1°TueOct 20
- −3°−2°WedOct 21
- −4°−2°ThuOct 22
- −3°−2°FriOct 23
- —SatOct 24
San Mar weather by month: normals, records, snow and freeze dates
Sun & moon
Sun
Sunrise 7:30 AM, sunset 6:18 PM.
- Daylight
- 10 h 49 min
- Losing 2 min 25 s a day; shortest Dec 21, 1 h 26 min less
- Golden hour
- 5:41–6:35 PM
- Morning 7:13–8:07 AM
- Blue hour
- 6:35–6:46 PM
- Morning 7:02–7:13 AM; first light 7:02 AM
Stars tonight? Fair
Clear 7:13 PM–7:03 AM, but the moon is 99% lit and up.
Moon
Waxing gibbous
98% lit · growing
- Today
- sets 5:42 AM · rises 5:15 PM
- Full moon
- Oct 26
- New moon
- Nov 9
