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Best time to visit · Iowa, United States
May and August – October are the best time to visit Dubuque on the climate data: September scores 85/100, with highs around 76°F (24°C) and 3.9 in (98 mm) of rain. April and June & July are good shoulder-season months. The toughest months are December – February, mainly because of cool days.
Highs run from 28°F to 84°F across the year, and the yearly total is about 37.8 in (959 mm) of rain and snow.
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high | 28°F-2°C | 32°F0°C | 46°F8°C | 59°F15°C | 70°F21°C | 80°F27°C | 84°F29°C | 82°F28°C | 76°F24°C | 60°F16°C | 46°F8°C | 33°F0°C |
| Avg low | 12°F-11°C | 14°F-10°C | 26°F-3°C | 37°F3°C | 50°F10°C | 61°F16°C | 65°F18°C | 62°F17°C | 54°F12°C | 40°F5°C | 29°F-2°C | 18°F-8°C |
| Rain/snow | 1.2 in31 mm | 1.5 in37 mm | 2.2 in55 mm | 3.7 in95 mm | 4.3 in109 mm | 5.4 in137 mm | 4.4 in112 mm | 4.1 in103 mm | 3.9 in98 mm | 3.1 in79 mm | 2.1 in54 mm | 1.9 in49 mm |
| Humidity | 87% | 85% | 79% | 75% | 77% | 77% | 75% | 74% | 74% | 76% | 81% | 88% |
| Cloud | 65% | 64% | 64% | 62% | 64% | 57% | 49% | 50% | 46% | 58% | 64% | 71% |
| Comfort | 48 | 49 | 56 | 74 | 80 | 74 | 74 | 79 | 85 | 79 | 56 | 45 |
Source: NASA POWER (public domain), 2001–2025 monthly averages on a ~50 km satellite and reanalysis grid, so coasts and valleys can differ from what's shown. The grid cell sits at about 275 m (902 ft), close to Dubuque's own ~190 m. Precipitation includes snow as melted water; daylight is calculated from latitude. Check a forecast before you go.
The cold peaks here: highs of 28–33°F (-2–0°C), and nights reach 12°F (-11°C). It's the driest season, with only about 4.6 in (117 mm) of rain or snow, 12% of the year's total. December – February are cold enough for snow. It holds the toughest stretch on our comfort score (December – February), averaging 47/100.
Temperatures climb through the season, from 46°F highs in March to 70°F by May. About 10.2 in (259 mm) of rain or snow falls across these months, 27% of the year's total. March is cold enough for snow. May is among the best-scoring months (season average 70/100).
Peak warmth: highs of 80–84°F (27–29°C). It's the wettest season, with about 13.9 in (352 mm) of rain, 37% of the year's total. June & July feel humid, with humidity near 77%. Comfort peaks here: August ranks with the year's best, and the season averages 76/100.
Temperatures slide from 76°F highs in September to 46°F by November. About 9.1 in (231 mm) of rain falls across these months, 24% of the year's total. Nights dip below freezing in November. September & October are among the best-scoring months (season average 73/100).
By comfort score: 4 Great, 3 Good and 5 Fair. Great months: May and August – October. Tap a month for its own guide.
May and August – October are the best time to visit Dubuque on the climate data: September scores 85/100, with highs around 76°F (24°C) and 3.9 in (98 mm) of rain. April and June & July are good shoulder-season months. The toughest months are December – February, mainly because of cool days.
June is the wettest month, averaging about 5.4 in (137 mm) of rain. January is the driest, with about 1.2 in (31 mm). The yearly total is around 37.8 in (959 mm).
January is the coldest, with average lows of 12°F (-11°C) and highs of 28°F (-2°C). The warmest is July, with average highs of 84°F (29°C).
Yes: in June & July humidity averages 77% with warm temperatures, so it feels muggy. Summer highs peak around 84°F (29°C).
On average, yes: lows fall below 32°F (0°C) in November – March, bottoming out around 12°F (-11°C) in January.
Poll the group on May and August – October dates, then plan the days, packing and costs together.
