Tiffin, Iowa Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Tiffin weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Drizzle65%0.04″84°67°—
- SundayJul 5Overcast11%—85°69°+1°
- MondayJul 6Mostly Clear——81°65°-4°
- TuesdayJul 7Overcast——82°63°+1°
- WednesdayJul 8T-storm w/ Hail26%—84°65°+2°
- ThursdayJul 9Light Showers36%—80°68°-4°
- FridayJul 10Light Drizzle17%—82°66°+2°
AQI 29 (Good), driven by Ozone. AQI up 5 over the last 6 hours (gradual rise). Ozone at AQI 44 now. With UV 6.5 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 38 around 1 PM.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 44 now. With UV 6.5 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 38 around 1 PM.
- Present
- AQI 44
- UV peak
- 6.5 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 38
PM × Wind × Precip
PM2.5 at 7.5 µg/m³, PM10 at 10.2 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.74
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- background
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
- 11:03 PM
- Moonset
- 10:11 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Tiffin at a glance
- Today vs. normal: 14°F above the seasonal normal for this latitude
- Last frost: April 26 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 52340
16-Day Forecast — Tiffin
- Sat85°67°65%
- Sun85°69°11%
- Mon81°65°2%
- Tue82°63°2%
- Wed84°65°26%
- Thu80°68°36%
- Fri82°66°17%
- Sat73°61°8%
- Sun76°59°8%
- Mon76°58°9%
- Tue79°60°10%
- Wed78°59°23%
- Thu83°64°19%
- Fri80°67°26%
- Sat76°63°26%
- Sun74°59°23%
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 — Tiffin
SPC includes Tiffin in the general thunderstorm area today — no severe risk, but storms are possible.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3NONENo severe risk
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
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 Tiffin
- 52340