Berwyn, Pennsylvania Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Berwyn weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Drizzle41%0.04″100°75°—
- SundayJul 5Rain89%0.37″95°71°-5°
- MondayJul 6Thunderstorm89%0.36″75°64°-20°
- TuesdayJul 7Light Drizzle72%0.01″67°60°-8°
- WednesdayJul 8Overcast16%—84°57°+17°
- ThursdayJul 9Light Drizzle28%—89°65°+5°
- FridayJul 10Drizzle33%—91°70°+2°
AQI 57 (Moderate), driven by PM2.5. AQI up 6 over the last 6 hours (gradual rise). PM2.5 at 16.6 µg/m³ (AQI 65) with a 0.89 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in calm air, not road dust.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 6 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 39 now. With UV 1.3 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 9 around 1 PM.
- Present
- AQI 39
- UV peak
- 1.3 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 9
PM × Wind × Precip
PM2.5 at 16.6 µg/m³ (AQI 65) with a 0.89 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.89
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 10:55 PM
- Moonset
- 10:05 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Berwyn at a glance
- Today vs. normal: 9°F above the seasonal normal for this latitude
- Last frost: April 16 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 19312
16-Day Forecast — Berwyn
- Sat100°75°41%
- Sun95°71°89%
- Mon75°64°89%
- Tue67°60°72%
- Wed84°57°16%
- Thu89°65°28%
- Fri91°70°33%
- Sat81°71°33%
- Sun73°65°30%
- Mon70°65°15%
- Tue82°63°16%
- Wed88°66°24%
- Thu91°71°23%
- Fri94°75°34%
- Sat78°70°39%
- Sun86°68°35%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 4, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
SPC Convective Outlook
Storm Prediction Center — Berwyn
SPC has placed Berwyn in the Slight Risk category for severe thunderstorms today.
- TODAYSLGTSlight Risk
- TOMORROWSLGTSlight Risk
- DAY 3TSTMGeneral Thunderstorms
Scattered severe storms possible. A few tornadoes, hail, and damaging wind gusts possible.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.
ZIP codes in Berwyn
- 19333
- 19301
- 19312
- 19398