Norwalk weather in October
In October, Norwalk sees average daytime highs of 62°F and overnight lows near 51°F, with 4.0 in of rain across 8.5 wet days and about 10.9 hours of daylight. It is the 6th-warmest and 4th-wettest month of the year here.
Highs ease over the month, from about 67°F in the first days to 58°F by the end. The sky is clear or mostly clear about 38% of the time in October, and the air most often feels dry.
Daylight stretches from about 11 h 36 min at the start of October to 10 h 12 min by month's end. Set against the rest of the year, October is Norwalk's 1st-clearest and 7th-windiest month. For the whole year in context, see Norwalk's year-round climate.
- Daytime high
- 62°
- 6th warmest
- Overnight low
- 51°
- 7th coldest
- Rainfall
- 4.0 in
- 8.5 wet days
- Daylight
- 10 h 54 min
- 6:12 AM – 5:05 PM
- Cloud cover
- 53%
- 1st clearest
- Wind
- 8 mph
- 7th windiest
- Solar energy
- 3.11 kWh/m²
- Travel score
- 5.6
- out of 10
Norwalk is city in Fairfield County, Connecticut, United States.
- Density
- 940/km²
- people per km²
- Founded
- 1640
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in October
Highs ease over the month, from about 67°F in the first days to 58°F by the end.
A typical October day in Norwalk reaches about 62°F in the afternoon and slips back to 51°F overnight — a 11°F spread between the day's warmth and the night's chill. On most days the high lands between 54°F and 71°F. Set against its neighbours, October runs about 11°F cooler than September and about 10°F warmer than November.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 68 | 68 | 67 | 67 | 67 | 66 | 66 | 65 | 65 | 65 | 64 | 64 | 64 | 63 | 63 | 62 | 62 | 62 | 61 | 61 | 61 | 60 | 60 | 60 | 59 | 59 | 58 | 58 | 58 | 58 | 57 |
| Avg low (°F) | 56 | 56 | 56 | 55 | 55 | 55 | 54 | 54 | 53 | 53 | 53 | 52 | 52 | 52 | 51 | 51 | 51 | 50 | 50 | 50 | 49 | 49 | 49 | 48 | 48 | 47 | 47 | 47 | 46 | 46 | 46 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| 1 | 68 | 56 |
| 2 | 68 | 56 |
| 3 | 67 | 56 |
| 4 | 67 | 55 |
| 5 | 67 | 55 |
| 6 | 66 | 55 |
| 7 | 66 | 54 |
| 8 | 65 | 54 |
| 9 | 65 | 53 |
| 10 | 65 | 53 |
| 11 | 64 | 53 |
| 12 | 64 | 52 |
| 13 | 64 | 52 |
| 14 | 63 | 52 |
| 15 | 63 | 51 |
| 16 | 62 | 51 |
| 17 | 62 | 51 |
| 18 | 62 | 50 |
| 19 | 61 | 50 |
| 20 | 61 | 50 |
| 21 | 61 | 49 |
| 22 | 60 | 49 |
| 23 | 60 | 49 |
| 24 | 60 | 48 |
| 25 | 59 | 48 |
| 26 | 59 | 47 |
| 27 | 58 | 47 |
| 28 | 58 | 47 |
| 29 | 58 | 46 |
| 30 | 58 | 46 |
| 31 | 57 | 46 |
How October really feels in Norwalk
Once humidity and wind are folded in, October averages 0 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.
October sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Norwalk weather by month
How October compares with the rest of the year at a glance. October is the 6th-warmest and 4th-wettest month here — the current month is highlighted below.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 37° / 26° | 3.3 | 9 | 4.6 | 9.4 | 0.0 |
| Feb | 39° / 27° | 3.1 | 8.6 | 4 | 10.4 | 0.0 |
| Mar | 46° / 34° | 4.1 | 10.3 | 3.4 | 11.7 | 1.2 |
| Apr | 57° / 44° | 3.6 | 10.5 | 0.4 | 13.1 | 3.9 |
| May | 67° / 54° | 3.4 | 10.9 | 0 | 14.3 | 5.9 |
| Jun | 76° / 64° | 3.7 | 10.8 | 0 | 14.9 | 6.6 |
| Jul | 82° / 70° | 3.6 | 10.8 | 0 | 14.7 | 6.3 |
| Aug | 80° / 69° | 4.1 | 10.5 | 0 | 13.6 | 6.5 |
| Sep | 73° / 62° | 3.7 | 9 | 0 | 12.3 | 7.0 |
| Oct | 62° / 51° | 4.0 | 8.5 | 0 | 10.9 | 5.6 |
| Nov | 52° / 41° | 3.2 | 8.5 | 0.4 | 9.7 | 2.9 |
| Dec | 43° / 33° | 4.1 | 9.8 | 2.7 | 9.1 | 0.5 |
Cloud cover in October
The sky is clear or mostly clear about 38% of the time in October, the clearest month of the year.
Beyond those clear spells, partly cloudy skies cover about 15% of October, with mostly cloudy or overcast conditions the remaining 47%.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 52 | 53 | 53 | 54 | 54 | 54 | 55 | 55 | 55 | 55 | 55 | 55 | 55 | 55 | 55 | 55 | 53 | 53 | 53 | 53 | 52 | 52 | 52 | 52 | 52 | 51 | 51 | 51 | 51 | 51 | 51 |
| Cloudier (%) | 48 | 47 | 47 | 46 | 46 | 46 | 45 | 45 | 45 | 45 | 45 | 45 | 45 | 45 | 45 | 45 | 47 | 47 | 47 | 47 | 48 | 48 | 48 | 48 | 48 | 49 | 49 | 49 | 49 | 49 | 49 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 52 | 48 |
| 2 | 53 | 47 |
| 3 | 53 | 47 |
| 4 | 54 | 46 |
| 5 | 54 | 46 |
| 6 | 54 | 46 |
| 7 | 55 | 45 |
| 8 | 55 | 45 |
| 9 | 55 | 45 |
| 10 | 55 | 45 |
| 11 | 55 | 45 |
| 12 | 55 | 45 |
| 13 | 55 | 45 |
| 14 | 55 | 45 |
| 15 | 55 | 45 |
| 16 | 55 | 45 |
| 17 | 53 | 47 |
| 18 | 53 | 47 |
| 19 | 53 | 47 |
| 20 | 53 | 47 |
| 21 | 52 | 48 |
| 22 | 52 | 48 |
| 23 | 52 | 48 |
| 24 | 52 | 48 |
| 25 | 52 | 48 |
| 26 | 51 | 49 |
| 27 | 51 | 49 |
| 28 | 51 | 49 |
| 29 | 51 | 49 |
| 30 | 51 | 49 |
| 31 | 51 | 49 |
Chance of precipitation in October
Norwalk gets around 4.0 in of rain over 8.5 wet days in October. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 28% and peaks near 30% on the wettest days.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 30 | 30 | 30 | 30 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 27 | 27 | 27 | 27 | 27 | 27 |
| Rain chance (%) | |
|---|---|
| 1 | 30 |
| 2 | 30 |
| 3 | 30 |
| 4 | 30 |
| 5 | 29 |
| 6 | 29 |
| 7 | 29 |
| 8 | 29 |
| 9 | 29 |
| 10 | 29 |
| 11 | 29 |
| 12 | 29 |
| 13 | 29 |
| 14 | 29 |
| 15 | 29 |
| 16 | 28 |
| 17 | 28 |
| 18 | 28 |
| 19 | 28 |
| 20 | 28 |
| 21 | 28 |
| 22 | 28 |
| 23 | 28 |
| 24 | 28 |
| 25 | 28 |
| 26 | 27 |
| 27 | 27 |
| 28 | 27 |
| 29 | 27 |
| 30 | 27 |
| 31 | 27 |
Humidity in October
Most of October feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, October lands in the dry band about 76% of days. It rarely turns muggy — the humid and sticky bands barely register.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 53 | 54 | 55 | 58 | 61 | 62 | 64 | 65 | 68 | 69 | 71 | 73 | 74 | 76 | 77 | 79 | 81 | 83 | 84 | 84 | 85 | 86 | 86 | 89 | 89 | 89 | 90 | 90 | 91 | 91 | 92 |
| Comfortable (%) | 22 | 22 | 22 | 22 | 21 | 21 | 21 | 20 | 19 | 19 | 18 | 17 | 16 | 16 | 15 | 14 | 13 | 12 | 11 | 11 | 10 | 9 | 9 | 8 | 8 | 8 | 7 | 7 | 7 | 7 | 6 |
| Humid (%) | 15 | 15 | 14 | 13 | 12 | 11 | 10 | 10 | 9 | 8 | 8 | 7 | 7 | 6 | 6 | 5 | 5 | 4 | 4 | 4 | 4 | 4 | 4 | 3 | 3 | 3 | 3 | 3 | 2 | 2 | 2 |
| Muggy (%) | 9 | 8 | 8 | 7 | 6 | 6 | 5 | 5 | 4 | 4 | 3 | 3 | 3 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Oppressive (%) | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | |
|---|---|---|---|---|---|
| 1 | 53 | 22 | 15 | 9 | 1 |
| 2 | 54 | 22 | 15 | 8 | 1 |
| 3 | 55 | 22 | 14 | 8 | 1 |
| 4 | 58 | 22 | 13 | 7 | 0 |
| 5 | 61 | 21 | 12 | 6 | 0 |
| 6 | 62 | 21 | 11 | 6 | 0 |
| 7 | 64 | 21 | 10 | 5 | 0 |
| 8 | 65 | 20 | 10 | 5 | 0 |
| 9 | 68 | 19 | 9 | 4 | 0 |
| 10 | 69 | 19 | 8 | 4 | 0 |
| 11 | 71 | 18 | 8 | 3 | 0 |
| 12 | 73 | 17 | 7 | 3 | 0 |
| 13 | 74 | 16 | 7 | 3 | 0 |
| 14 | 76 | 16 | 6 | 2 | 0 |
| 15 | 77 | 15 | 6 | 2 | 0 |
| 16 | 79 | 14 | 5 | 2 | 0 |
| 17 | 81 | 13 | 5 | 1 | 0 |
| 18 | 83 | 12 | 4 | 1 | 0 |
| 19 | 84 | 11 | 4 | 1 | 0 |
| 20 | 84 | 11 | 4 | 1 | 0 |
| 21 | 85 | 10 | 4 | 1 | 0 |
| 22 | 86 | 9 | 4 | 1 | 0 |
| 23 | 86 | 9 | 4 | 1 | 0 |
| 24 | 89 | 8 | 3 | 0 | 0 |
| 25 | 89 | 8 | 3 | 0 | 0 |
| 26 | 89 | 8 | 3 | 0 | 0 |
| 27 | 90 | 7 | 3 | 0 | 0 |
| 28 | 90 | 7 | 3 | 0 | 0 |
| 29 | 91 | 7 | 2 | 0 | 0 |
| 30 | 91 | 7 | 2 | 0 | 0 |
| 31 | 92 | 6 | 2 | 0 | 0 |
Wind in October
Winds average 8 mph in October.
Across October, daily wind ranges from about 7 mph on the calmest days to 8 mph at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (mph) | 7 | 7 | 7 | 7 | 7 | 7 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 |
| Feels | calm | calm | calm | calm | calm | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze |
| Wind speed (mph) | Feels | |
|---|---|---|
| 1 | 7 | calm |
| 2 | 7 | calm |
| 3 | 7 | calm |
| 4 | 7 | calm |
| 5 | 7 | calm |
| 6 | 7 | light breeze |
| 7 | 8 | light breeze |
| 8 | 8 | light breeze |
| 9 | 8 | light breeze |
| 10 | 8 | light breeze |
| 11 | 8 | light breeze |
| 12 | 8 | light breeze |
| 13 | 8 | light breeze |
| 14 | 8 | light breeze |
| 15 | 8 | light breeze |
| 16 | 8 | light breeze |
| 17 | 8 | light breeze |
| 18 | 8 | light breeze |
| 19 | 8 | light breeze |
| 20 | 8 | light breeze |
| 21 | 8 | light breeze |
| 22 | 8 | light breeze |
| 23 | 8 | light breeze |
| 24 | 8 | light breeze |
| 25 | 8 | light breeze |
| 26 | 8 | light breeze |
| 27 | 8 | light breeze |
| 28 | 8 | light breeze |
| 29 | 8 | light breeze |
| 30 | 8 | light breeze |
| 31 | 8 | light breeze |
Sunrise & sunset in October
Daylight runs from about 11 h 36 min at the start of October to 10 h 12 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 84 minutes over October. Sunrise moves from 5:56 AM to 6:30 AM, and sunset from 5:30 PM to 4:44 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 11.6 | 11.5 | 11.5 | 11.4 | 11.4 | 11.3 | 11.3 | 11.2 | 11.2 | 11.2 | 11.1 | 11.1 | 11.0 | 11.0 | 10.9 | 10.9 | 10.8 | 10.8 | 10.7 | 10.7 | 10.7 | 10.6 | 10.6 | 10.5 | 10.5 | 10.4 | 10.4 | 10.4 | 10.3 | 10.3 | 10.2 |
| Sunrise (AM) | 5:56 | 5:57 | 5:58 | 5:59 | 6:00 | 6:01 | 6:02 | 6:03 | 6:04 | 6:05 | 6:07 | 6:08 | 6:09 | 6:10 | 6:11 | 6:12 | 6:13 | 6:15 | 6:16 | 6:17 | 6:18 | 6:19 | 6:20 | 6:22 | 6:23 | 6:24 | 6:25 | 6:26 | 6:28 | 6:29 | 6:30 |
| Sunset (PM) | 5:30 | 5:28 | 5:26 | 5:24 | 5:23 | 5:21 | 5:19 | 5:18 | 5:16 | 5:15 | 5:13 | 5:11 | 5:10 | 5:08 | 5:07 | 5:05 | 5:04 | 5:02 | 5:01 | 4:59 | 4:58 | 4:56 | 4:55 | 4:53 | 4:52 | 4:51 | 4:49 | 4:48 | 4:47 | 4:46 | 4:44 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 11.6 | 5:56 | 5:30 |
| 2 | 11.5 | 5:57 | 5:28 |
| 3 | 11.5 | 5:58 | 5:26 |
| 4 | 11.4 | 5:59 | 5:24 |
| 5 | 11.4 | 6:00 | 5:23 |
| 6 | 11.3 | 6:01 | 5:21 |
| 7 | 11.3 | 6:02 | 5:19 |
| 8 | 11.2 | 6:03 | 5:18 |
| 9 | 11.2 | 6:04 | 5:16 |
| 10 | 11.2 | 6:05 | 5:15 |
| 11 | 11.1 | 6:07 | 5:13 |
| 12 | 11.1 | 6:08 | 5:11 |
| 13 | 11.0 | 6:09 | 5:10 |
| 14 | 11.0 | 6:10 | 5:08 |
| 15 | 10.9 | 6:11 | 5:07 |
| 16 | 10.9 | 6:12 | 5:05 |
| 17 | 10.8 | 6:13 | 5:04 |
| 18 | 10.8 | 6:15 | 5:02 |
| 19 | 10.7 | 6:16 | 5:01 |
| 20 | 10.7 | 6:17 | 4:59 |
| 21 | 10.7 | 6:18 | 4:58 |
| 22 | 10.6 | 6:19 | 4:56 |
| 23 | 10.6 | 6:20 | 4:55 |
| 24 | 10.5 | 6:22 | 4:53 |
| 25 | 10.5 | 6:23 | 4:52 |
| 26 | 10.4 | 6:24 | 4:51 |
| 27 | 10.4 | 6:25 | 4:49 |
| 28 | 10.4 | 6:26 | 4:48 |
| 29 | 10.3 | 6:28 | 4:47 |
| 30 | 10.3 | 6:29 | 4:46 |
| 31 | 10.2 | 6:30 | 4:44 |
Solar energy in October
Average shortwave solar energy reaching the ground each day in October, about 3.11 kWh/m².
For context, solar energy here swings from a low near 1.73 kWh/m² to a high of 6.1 kWh/m² in June across the year — October's 3.11 kWh/m² falls in the middle.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 3.6 | 3.6 | 3.5 | 3.5 | 3.5 | 3.5 | 3.4 | 3.4 | 3.4 | 3.3 | 3.3 | 3.3 | 3.2 | 3.2 | 3.2 | 3.1 | 3.1 | 3.1 | 3.0 | 3.0 | 3.0 | 2.9 | 2.9 | 2.8 | 2.8 | 2.8 | 2.7 | 2.7 | 2.7 | 2.6 | 2.6 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 3.6 | Moderate |
| 2 | 3.6 | Moderate |
| 3 | 3.5 | Moderate |
| 4 | 3.5 | Moderate |
| 5 | 3.5 | Moderate |
| 6 | 3.5 | Moderate |
| 7 | 3.4 | Moderate |
| 8 | 3.4 | Moderate |
| 9 | 3.4 | Moderate |
| 10 | 3.3 | Moderate |
| 11 | 3.3 | Moderate |
| 12 | 3.3 | Moderate |
| 13 | 3.2 | Moderate |
| 14 | 3.2 | Moderate |
| 15 | 3.2 | Moderate |
| 16 | 3.1 | Moderate |
| 17 | 3.1 | Moderate |
| 18 | 3.1 | Moderate |
| 19 | 3.0 | Moderate |
| 20 | 3.0 | Moderate |
| 21 | 3.0 | Moderate |
| 22 | 2.9 | Moderate |
| 23 | 2.9 | Moderate |
| 24 | 2.8 | Moderate |
| 25 | 2.8 | Moderate |
| 26 | 2.8 | Moderate |
| 27 | 2.7 | Moderate |
| 28 | 2.7 | Moderate |
| 29 | 2.7 | Moderate |
| 30 | 2.6 | Moderate |
| 31 | 2.6 | Moderate |
Hazard calendar for Norwalk
In October, Norwalk sits inside its atlantic hurricane season. The full year is below, with each hazard's peak months called out.
Norwalk sits in the Atlantic hurricane belt; the season peaks August–October.
Is October a good time to visit Norwalk?
Our two travel scores rate October for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
October is a reasonable time to visit Norwalk for sightseeing.
What to pack for Norwalk in October
From October's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In October, Norwalk sees daytime highs around 62°F and nights near 51°F. Worth packing: a warm layer and rain gear. About 9 days see rain.
Sea temperature near Norwalk in October
The nearest coast averages about 64°F in October — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore is warmest in August at about 74°F and coldest in February near 35°F.
It's comfortable for a long swim from Jun 30 to Sep 30 — about 3.1 months when the water holds above 68°F.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 39 | 35 | 37 | 44 | 55 | 65 | 72 | 74 | 71 | 64 | 55 | 46 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Refreshing | Refreshing | Refreshing | Cool | Bracing | Bracing |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 39 | Bracing |
| Feb | 35 | Bracing |
| Mar | 37 | Bracing |
| Apr | 44 | Bracing |
| May | 55 | Bracing |
| Jun | 65 | Cool |
| Jul | 72 | Refreshing |
| Aug | 74 | Refreshing |
| Sep | 71 | Refreshing |
| Oct | 64 | Cool |
| Nov | 55 | Bracing |
| Dec | 46 | Bracing |
UV index in Norwalk in October
Clear-sky midday UV in October peaks around 3 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Norwalk peaks around July 11 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 23 at about 1 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 3 | 5 | 6 | 7 | 8 | 8 | 6 | 6 | 3 | 2 | 1 |
| Level | Low | Moderate | Moderate | High | Very high | Very high | Very high | High | High | Moderate | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Low |
| Feb | 3 | Moderate |
| Mar | 5 | Moderate |
| Apr | 6 | High |
| May | 7 | Very high |
| Jun | 8 | Very high |
| Jul | 8 | Very high |
| Aug | 6 | High |
| Sep | 6 | High |
| Oct | 3 | Moderate |
| Nov | 2 | Moderate |
| Dec | 1 | Low |
Air quality in Norwalk in October
Average fine-particle pollution (PM2.5) through the year — so you can see where October falls, not just the annual average.
Air quality in Norwalk is worst in July — around 20 µg/m³ PM2.5 (moderate), about 1.7× the cleanest month (November, 11 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 13 | 16 | 17 | 17 | 18 | 19 | 20 | 17 | 16 | 13 | 11 | 13 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 13 | Moderate |
| Feb | 16 | Moderate |
| Mar | 17 | Moderate |
| Apr | 17 | Moderate |
| May | 18 | Moderate |
| Jun | 19 | Moderate |
| Jul | 20 | Moderate |
| Aug | 17 | Moderate |
| Sep | 16 | Moderate |
| Oct | 13 | Moderate |
| Nov | 11 | Good |
| Dec | 13 | Moderate |
Where is Norwalk?
Norwalk sits at 41.1°N, 73.4°W, 36 ft above sea level, in United States. The nearest listed city is East Norwalk, 1.2 mi away.
Topography around Norwalk
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Norwalk.
Within 2 miles, the terrain around Norwalk has only modest variations in elevation — a maximum elevation change of 253 ft around an average of 85 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 781 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,913 ft.
The land around Norwalk is covered by trees (56%) and artificial surfaces (26%) within 2 miles, trees (54%) and water (36%) within 10 miles, and trees (55%) and water (30%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Norwalk (41.1176°, -73.4079°, elevation 36 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).