SeasonMapHyannis (Cape Cod) weather in October
United States
October in Hyannis: nice, rainy, with clean air — a good time to visit.
#6 of 12 months in Hyannis · #1087 of 1383 destinations to visit in October · comfort 62/100 (tier C)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Hyannis in October
Notes from nearby Boston (101 km away)
Hyannis doesn't have its own notes for October yet — these are about Boston, close enough to share the season.
Boston's own foliage runs late, and the forum is consistent about it: early October is too early in the city, peak colour lands at the very end of October into the first days of November, and by around 20 October much of the greater-Boston leaf can already be down if there has been an early freeze or a heavy storm. For colour earlier in the month regulars send you out of the city — west to the Berkshires, or north into New Hampshire and Vermont, all car trips. The weather meanwhile is mild for the latitude: highs near 17°C, cooling to about 10 at night.
Add your own note from Hyannis's card on the map.
Hyannis climate normals — October
| Daytime high | 18°C / 64°F | 😎 nice |
|---|---|---|
| Nighttime low | 9°C / 48°F | |
| Feels like (high) | 16°C / 61°F | |
| Sea temperature | 17°C / 63°F | 🧊 bracing |
| Rainfall | 145 mm / 5.7 in | 🌧 rainy |
| Rainy days | 11 days | |
| Humidity | 77% | 💦 very humid |
| Dew point | 10°C / 50°F | |
| Sunshine | 7.4 h/day | |
| Daylight | 11.1 h | |
| Wind | 26 km/h / 16 mph | |
| Air quality (US AQI) | 37 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Hyannis in October
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
BusyIsland ferry high season(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Hyannis's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Fair weatherHyannis's weather peaks June–August, best around July.
Best weatherFair weatherToughest weather
What's on in Hyannis in October
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Opening
Island ferry high season
20 May – 15 Oct · usuallySummer season opensCrowdedBook earlyHyannis is the mainland end of the Nantucket boats, and the summer timetable adds fast ferries and extra sailings from late May. Car spaces on the traditional boat are released months ahead and go the day they open. Source ↗
- Nature
White shark season
1 Jun – 31 Oct · usuallyWildlife seasonRiskWhite sharks follow the grey seals into Cape waters from early summer and are gone by late autumn, with the tagged detections peaking in August and September. It is the ocean side that closes for sightings, not the calmer Nantucket Sound beaches in town. Source ↗
- Hazard
Hurricane season
15 Aug – 31 Oct · usuallyClosuresNew England catches the tail of Atlantic systems in late summer and autumn, and even a passing storm cancels the island ferries and takes the power out for a day or two. Direct hits are rare; disrupted travel is not. Source ↗
Nearby, and something's on
Within 300 km of Hyannis — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Hyannis?
Hyannis in October — FAQ
- Is October a good time to visit Hyannis?
- October in Hyannis: nice, rainy, with clean air — a good time to visit. It ranks #6 of 12 months for Hyannis on SeasonMap's comfort score (62/100).
- What is the weather like in Hyannis in October?
- In October, Hyannis averages a daily high of 17.7°C and a low of 8.7°C, with about 144.5 mm of rain over roughly 10.6 rainy days.
- What is the air quality in Hyannis in October?
- Hyannis has a mean US Air Quality Index of about 37 in October.
Other months in Hyannis
Compare Hyannis in October
Warmer or cooler than Hyannis in October
Similar destinations in North America — October
Within 300 km: Newport's Autumn on the Cliff Walk around 10 Oct – 10 Nov, and Boston's Whales on Stellwagen Bank around 15 Apr – 20 Oct.