Cambridge weather in September
In September, Cambridge sees average daytime highs of 21°C and overnight lows near 11°C, with 78 mm of rain across 9.5 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 5th-wettest month of the year here.
Highs ease over the month, from about 24°C in the first days to 19°C by the end. The sky is clear or mostly clear about 34% of the time in September, and the air most often feels dry.
Daylight stretches from about 13 hours at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Cambridge's 3rd-clearest and 10th-windiest month. For the whole year in context, see Cambridge's year-round climate.
- Daytime high
- 21°
- 4th warmest
- Overnight low
- 11°
- 9th coldest
- Rainfall
- 78 mm
- 9.5 wet days
- Daylight
- 12 h 18 min
- 6:07 AM – 6:24 PM
- Cloud cover
- 56%
- 3rd clearest
- Wind
- 11 km/h
- 10th windiest
- Solar energy
- 4.15 kWh/m²
- Travel score
- 6.6
- out of 10
Cambridge is city in the Regional Municipality of Waterloo, Ontario, Canada.
- Founded
- 1973
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in September
Highs ease over the month, from about 24°C in the first days to 19°C by the end.
A typical September day in Cambridge reaches about 21°C in the afternoon and slips back to 11°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 27°C. Set against its neighbours, September runs about 4°C cooler than August and about 7°C warmer than October.
| 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 24 | 24 | 24 | 24 | 23 | 23 | 23 | 23 | 23 | 23 | 22 | 22 | 22 | 22 | 22 | 21 | 21 | 21 | 21 | 21 | 20 | 20 | 20 | 20 | 19 | 19 | 19 | 19 | 18 | 18 |
| Avg low (°C) | 14 | 14 | 13 | 13 | 13 | 13 | 13 | 13 | 12 | 12 | 12 | 12 | 12 | 11 | 11 | 11 | 11 | 11 | 10 | 10 | 10 | 10 | 9 | 9 | 9 | 9 | 9 | 8 | 8 | 8 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 24 | 14 |
| 2 | 24 | 14 |
| 3 | 24 | 13 |
| 4 | 24 | 13 |
| 5 | 23 | 13 |
| 6 | 23 | 13 |
| 7 | 23 | 13 |
| 8 | 23 | 13 |
| 9 | 23 | 12 |
| 10 | 23 | 12 |
| 11 | 22 | 12 |
| 12 | 22 | 12 |
| 13 | 22 | 12 |
| 14 | 22 | 11 |
| 15 | 22 | 11 |
| 16 | 21 | 11 |
| 17 | 21 | 11 |
| 18 | 21 | 11 |
| 19 | 21 | 10 |
| 20 | 21 | 10 |
| 21 | 20 | 10 |
| 22 | 20 | 10 |
| 23 | 20 | 9 |
| 24 | 20 | 9 |
| 25 | 19 | 9 |
| 26 | 19 | 9 |
| 27 | 19 | 9 |
| 28 | 19 | 8 |
| 29 | 18 | 8 |
| 30 | 18 | 8 |
How September really feels in Cambridge
Once humidity and wind are folded in, September averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.
September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Cambridge weather by month
How September compares with the rest of the year at a glance. September is the 4th-warmest and 5th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | -1° / -9° | 65 | 10.8 | 8.5 | 9.2 | 0.0 |
| Feb | -0° / -9° | 53 | 8.5 | 6.6 | 10.2 | 0.0 |
| Mar | 5° / -4° | 64 | 9.9 | 4.9 | 11.6 | 0.4 |
| Apr | 12° / 2° | 87 | 11.8 | 1.9 | 13.2 | 3.1 |
| May | 19° / 8° | 87 | 11.6 | 0 | 14.5 | 5.7 |
| Jun | 24° / 13° | 94 | 11.5 | 0 | 15.2 | 6.6 |
| Jul | 26° / 16° | 83 | 10.8 | 0 | 14.9 | 6.6 |
| Aug | 25° / 15° | 75 | 9.6 | 0 | 13.8 | 6.9 |
| Sep | 21° / 11° | 78 | 9.5 | 0 | 12.3 | 6.6 |
| Oct | 14° / 5° | 77 | 11 | 0.2 | 10.8 | 4.0 |
| Nov | 7° / -0° | 71 | 10 | 2.8 | 9.5 | 1.0 |
| Dec | 1° / -5° | 63 | 10.2 | 7 | 8.8 | 0.0 |
Cloud cover in September
The sky is clear or mostly clear about 34% of the time in September.
Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 50%. Skies tend to cloud over as the month goes on.
| 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 55 | 54 | 54 | 54 | 54 | 54 | 53 | 53 | 52 | 52 | 51 | 50 | 50 | 50 | 50 | 50 | 50 | 49 | 49 | 49 | 49 | 49 | 48 | 48 | 48 | 48 | 47 | 47 | 47 | 47 |
| Cloudier (%) | 45 | 46 | 46 | 46 | 46 | 46 | 47 | 47 | 48 | 48 | 49 | 50 | 50 | 50 | 50 | 50 | 50 | 51 | 51 | 51 | 51 | 51 | 52 | 52 | 52 | 52 | 53 | 53 | 53 | 53 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 55 | 45 |
| 2 | 54 | 46 |
| 3 | 54 | 46 |
| 4 | 54 | 46 |
| 5 | 54 | 46 |
| 6 | 54 | 46 |
| 7 | 53 | 47 |
| 8 | 53 | 47 |
| 9 | 52 | 48 |
| 10 | 52 | 48 |
| 11 | 51 | 49 |
| 12 | 50 | 50 |
| 13 | 50 | 50 |
| 14 | 50 | 50 |
| 15 | 50 | 50 |
| 16 | 50 | 50 |
| 17 | 50 | 50 |
| 18 | 49 | 51 |
| 19 | 49 | 51 |
| 20 | 49 | 51 |
| 21 | 49 | 51 |
| 22 | 49 | 51 |
| 23 | 48 | 52 |
| 24 | 48 | 52 |
| 25 | 48 | 52 |
| 26 | 48 | 52 |
| 27 | 47 | 53 |
| 28 | 47 | 53 |
| 29 | 47 | 53 |
| 30 | 47 | 53 |
Chance of precipitation in September
Cambridge gets around 78 mm of rain over 9.5 wet days in September. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 31% and peaks near 36% 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 29 | 30 | 30 | 31 | 31 | 31 | 32 | 32 | 32 | 32 | 31 | 31 | 31 | 30 | 30 | 30 | 29 | 29 | 29 | 29 | 30 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 36 | 36 |
| Rain chance (%) | |
|---|---|
| 1 | 29 |
| 2 | 30 |
| 3 | 30 |
| 4 | 31 |
| 5 | 31 |
| 6 | 31 |
| 7 | 32 |
| 8 | 32 |
| 9 | 32 |
| 10 | 32 |
| 11 | 31 |
| 12 | 31 |
| 13 | 31 |
| 14 | 30 |
| 15 | 30 |
| 16 | 30 |
| 17 | 29 |
| 18 | 29 |
| 19 | 29 |
| 20 | 29 |
| 21 | 30 |
| 22 | 30 |
| 23 | 31 |
| 24 | 32 |
| 25 | 33 |
| 26 | 34 |
| 27 | 35 |
| 28 | 36 |
| 29 | 36 |
| 30 | 36 |
Humidity in September
Most of September feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, September lands in the dry band about 59% of days. Sticky, muggy-or-worse air turns up on roughly 7% of them.
| 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 36 | 38 | 39 | 41 | 43 | 44 | 46 | 48 | 49 | 50 | 53 | 53 | 55 | 56 | 59 | 59 | 61 | 62 | 65 | 65 | 67 | 69 | 70 | 72 | 73 | 74 | 76 | 77 | 78 | 79 |
| Comfortable (%) | 29 | 29 | 28 | 28 | 28 | 27 | 27 | 26 | 25 | 25 | 24 | 24 | 23 | 23 | 22 | 22 | 21 | 20 | 19 | 19 | 18 | 17 | 16 | 16 | 15 | 15 | 14 | 14 | 13 | 13 |
| Humid (%) | 19 | 18 | 17 | 17 | 16 | 16 | 15 | 15 | 15 | 15 | 14 | 14 | 14 | 14 | 13 | 13 | 13 | 13 | 12 | 12 | 12 | 11 | 11 | 10 | 10 | 9 | 9 | 8 | 8 | 7 |
| Muggy (%) | 14 | 14 | 13 | 13 | 12 | 11 | 11 | 10 | 10 | 9 | 8 | 8 | 7 | 7 | 6 | 6 | 5 | 5 | 4 | 4 | 3 | 3 | 3 | 2 | 2 | 2 | 1 | 1 | 1 | 1 |
| Oppressive (%) | 2 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | |
|---|---|---|---|---|---|
| 1 | 36 | 29 | 19 | 14 | 2 |
| 2 | 38 | 29 | 18 | 14 | 2 |
| 3 | 39 | 28 | 17 | 13 | 2 |
| 4 | 41 | 28 | 17 | 13 | 2 |
| 5 | 43 | 28 | 16 | 12 | 2 |
| 6 | 44 | 27 | 16 | 11 | 1 |
| 7 | 46 | 27 | 15 | 11 | 1 |
| 8 | 48 | 26 | 15 | 10 | 1 |
| 9 | 49 | 25 | 15 | 10 | 1 |
| 10 | 50 | 25 | 15 | 9 | 1 |
| 11 | 53 | 24 | 14 | 8 | 1 |
| 12 | 53 | 24 | 14 | 8 | 1 |
| 13 | 55 | 23 | 14 | 7 | 1 |
| 14 | 56 | 23 | 14 | 7 | 0 |
| 15 | 59 | 22 | 13 | 6 | 0 |
| 16 | 59 | 22 | 13 | 6 | 0 |
| 17 | 61 | 21 | 13 | 5 | 0 |
| 18 | 62 | 20 | 13 | 5 | 0 |
| 19 | 65 | 19 | 12 | 4 | 0 |
| 20 | 65 | 19 | 12 | 4 | 0 |
| 21 | 67 | 18 | 12 | 3 | 0 |
| 22 | 69 | 17 | 11 | 3 | 0 |
| 23 | 70 | 16 | 11 | 3 | 0 |
| 24 | 72 | 16 | 10 | 2 | 0 |
| 25 | 73 | 15 | 10 | 2 | 0 |
| 26 | 74 | 15 | 9 | 2 | 0 |
| 27 | 76 | 14 | 9 | 1 | 0 |
| 28 | 77 | 14 | 8 | 1 | 0 |
| 29 | 78 | 13 | 8 | 1 | 0 |
| 30 | 79 | 13 | 7 | 1 | 0 |
Wind in September
Winds average 11 km/h in September.
Across September, daily wind ranges from about 10 km/h on the calmest days to 12 km/h 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 10 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | light breeze |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 10 | calm |
| 2 | 11 | calm |
| 3 | 11 | calm |
| 4 | 11 | calm |
| 5 | 11 | calm |
| 6 | 11 | calm |
| 7 | 11 | calm |
| 8 | 11 | calm |
| 9 | 11 | calm |
| 10 | 11 | calm |
| 11 | 11 | calm |
| 12 | 11 | calm |
| 13 | 11 | calm |
| 14 | 11 | calm |
| 15 | 11 | calm |
| 16 | 11 | calm |
| 17 | 11 | calm |
| 18 | 11 | calm |
| 19 | 11 | calm |
| 20 | 11 | calm |
| 21 | 11 | calm |
| 22 | 11 | calm |
| 23 | 12 | calm |
| 24 | 12 | calm |
| 25 | 12 | calm |
| 26 | 12 | calm |
| 27 | 12 | calm |
| 28 | 12 | calm |
| 29 | 12 | calm |
| 30 | 12 | light breeze |
Sunrise & sunset in September
Daylight runs from about 13 hours at the start of September to 11 h 36 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 84 minutes over September. Sunrise moves from 5:50 AM to 6:23 AM, and sunset from 6:52 PM to 5:58 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 13.0 | 13.0 | 12.9 | 12.9 | 12.8 | 12.8 | 12.7 | 12.7 | 12.6 | 12.6 | 12.5 | 12.5 | 12.4 | 12.4 | 12.3 | 12.3 | 12.2 | 12.2 | 12.1 | 12.1 | 12.0 | 12.0 | 11.9 | 11.9 | 11.8 | 11.8 | 11.7 | 11.7 | 11.6 | 11.6 |
| Sunrise (AM) | 5:50 | 5:51 | 5:52 | 5:53 | 5:54 | 5:55 | 5:57 | 5:58 | 5:59 | 6:00 | 6:01 | 6:02 | 6:03 | 6:05 | 6:06 | 6:07 | 6:08 | 6:09 | 6:10 | 6:11 | 6:13 | 6:14 | 6:15 | 6:16 | 6:17 | 6:18 | 6:20 | 6:21 | 6:22 | 6:23 |
| Sunset (PM) | 6:52 | 6:50 | 6:49 | 6:47 | 6:45 | 6:43 | 6:41 | 6:39 | 6:38 | 6:36 | 6:34 | 6:32 | 6:30 | 6:28 | 6:26 | 6:24 | 6:22 | 6:21 | 6:19 | 6:17 | 6:15 | 6:13 | 6:11 | 6:09 | 6:07 | 6:05 | 6:04 | 6:02 | 6:00 | 5:58 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 13.0 | 5:50 | 6:52 |
| 2 | 13.0 | 5:51 | 6:50 |
| 3 | 12.9 | 5:52 | 6:49 |
| 4 | 12.9 | 5:53 | 6:47 |
| 5 | 12.8 | 5:54 | 6:45 |
| 6 | 12.8 | 5:55 | 6:43 |
| 7 | 12.7 | 5:57 | 6:41 |
| 8 | 12.7 | 5:58 | 6:39 |
| 9 | 12.6 | 5:59 | 6:38 |
| 10 | 12.6 | 6:00 | 6:36 |
| 11 | 12.5 | 6:01 | 6:34 |
| 12 | 12.5 | 6:02 | 6:32 |
| 13 | 12.4 | 6:03 | 6:30 |
| 14 | 12.4 | 6:05 | 6:28 |
| 15 | 12.3 | 6:06 | 6:26 |
| 16 | 12.3 | 6:07 | 6:24 |
| 17 | 12.2 | 6:08 | 6:22 |
| 18 | 12.2 | 6:09 | 6:21 |
| 19 | 12.1 | 6:10 | 6:19 |
| 20 | 12.1 | 6:11 | 6:17 |
| 21 | 12.0 | 6:13 | 6:15 |
| 22 | 12.0 | 6:14 | 6:13 |
| 23 | 11.9 | 6:15 | 6:11 |
| 24 | 11.9 | 6:16 | 6:09 |
| 25 | 11.8 | 6:17 | 6:07 |
| 26 | 11.8 | 6:18 | 6:05 |
| 27 | 11.7 | 6:20 | 6:04 |
| 28 | 11.7 | 6:21 | 6:02 |
| 29 | 11.6 | 6:22 | 6:00 |
| 30 | 11.6 | 6:23 | 5:58 |
Solar energy in September
Average shortwave solar energy reaching the ground each day in September, about 4.15 kWh/m².
For context, solar energy here swings from a low near 1.34 kWh/m² to a high of 6.29 kWh/m² in June across the year — September's 4.15 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 4.7 | 4.7 | 4.7 | 4.6 | 4.6 | 4.5 | 4.5 | 4.4 | 4.4 | 4.3 | 4.3 | 4.3 | 4.2 | 4.2 | 4.2 | 4.1 | 4.1 | 4.0 | 4.0 | 4.0 | 3.9 | 3.9 | 3.8 | 3.8 | 3.7 | 3.7 | 3.6 | 3.6 | 3.5 | 3.5 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 4.7 | Bright |
| 2 | 4.7 | Bright |
| 3 | 4.7 | Bright |
| 4 | 4.6 | Bright |
| 5 | 4.6 | Bright |
| 6 | 4.5 | Bright |
| 7 | 4.5 | Bright |
| 8 | 4.4 | Bright |
| 9 | 4.4 | Bright |
| 10 | 4.3 | Bright |
| 11 | 4.3 | Bright |
| 12 | 4.3 | Bright |
| 13 | 4.2 | Bright |
| 14 | 4.2 | Bright |
| 15 | 4.2 | Bright |
| 16 | 4.1 | Bright |
| 17 | 4.1 | Bright |
| 18 | 4.0 | Bright |
| 19 | 4.0 | Bright |
| 20 | 4.0 | Moderate |
| 21 | 3.9 | Moderate |
| 22 | 3.9 | Moderate |
| 23 | 3.8 | Moderate |
| 24 | 3.8 | Moderate |
| 25 | 3.7 | Moderate |
| 26 | 3.7 | Moderate |
| 27 | 3.6 | Moderate |
| 28 | 3.6 | Moderate |
| 29 | 3.5 | Moderate |
| 30 | 3.5 | Moderate |
Is September a good time to visit Cambridge?
Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
September is a reasonable time to visit Cambridge for sightseeing.
What to pack for Cambridge in September
From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In September, Cambridge sees daytime highs around 21°C and nights near 11°C. Worth packing: rain gear. About 10 days see rain.
Sea temperature near Cambridge in September
The nearest coast averages about 19°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 56 km away) is warmest in August at about 21°C and coldest in February near 3°C.
It's comfortable for a long swim from Jul 22 to Sep 1 — about 1.4 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 4 | 3 | 3 | 4 | 8 | 15 | 20 | 21 | 19 | 13 | 8 | 5 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Cool | Refreshing | Cool | Bracing | Bracing | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 4 | Bracing |
| Feb | 3 | Bracing |
| Mar | 3 | Bracing |
| Apr | 4 | Bracing |
| May | 8 | Bracing |
| Jun | 15 | Cool |
| Jul | 20 | Cool |
| Aug | 21 | Refreshing |
| Sep | 19 | Cool |
| Oct | 13 | Bracing |
| Nov | 8 | Bracing |
| Dec | 5 | Bracing |
UV index in Cambridge in September
Clear-sky midday UV in September peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Cambridge peaks around June 23 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 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) | 1 | 2 | 4 | 5 | 6 | 9 | 8 | 7 | 5 | 3 | 2 | 1 |
| Level | Low | Moderate | Moderate | High | High | Very high | Very high | High | High | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 2 | Moderate |
| Mar | 4 | Moderate |
| Apr | 5 | High |
| May | 6 | High |
| Jun | 9 | Very high |
| Jul | 8 | Very high |
| Aug | 7 | High |
| Sep | 5 | High |
| Oct | 3 | Moderate |
| Nov | 2 | Low |
| Dec | 1 | Low |
Air quality in Cambridge in September
Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.
Air quality in Cambridge is worst in July — around 16 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (November, 8 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) | 9 | 11 | 13 | 13 | 14 | 15 | 16 | 14 | 13 | 8 | 8 | 8 |
| Level | Good | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 9 | Good |
| Feb | 11 | Good |
| Mar | 13 | Moderate |
| Apr | 13 | Moderate |
| May | 14 | Moderate |
| Jun | 15 | Moderate |
| Jul | 16 | Moderate |
| Aug | 14 | Moderate |
| Sep | 13 | Moderate |
| Oct | 8 | Good |
| Nov | 8 | Good |
| Dec | 8 | Good |
Where is Cambridge?
Cambridge sits at 43.4°N, 80.3°W, 272 m above sea level, in Canada. The nearest listed city is Christopher-Champlain, 2.0 km away.
Topography around Cambridge
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Cambridge.
Within 3 km, the terrain around Cambridge has only modest variations in elevation — a maximum elevation change of 82 m around an average of 294 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 175 m; within 80 km, significant variations in elevation — a maximum elevation change of 461 m.
The land around Cambridge is covered by artificial surfaces (41%) and trees (36%) within 3 km, trees (37%) and cropland (33%) within 16 km, and cropland (51%) and trees (24%) within 80 km.
Canada travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 83% of US
- price level, 2025
- GDP per capita
- $55,698
- 2025
- Happiness
- 6.7 / 10
- World Happiness, 2025
- Safe drinking water
- 97%
- of population, 2024
- Homicide rate
- 2
- per 100k, 2023
- Road deaths
- 5.3
- 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 Cambridge (43.3601°, -80.3127°, elevation 272 m), 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. 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).