Avg High
Whistler in September
Avg Low
Rain
Daylight
13h
What to expect
In Whistler, September sits in early autumn, a shoulder-season month where the feel can shift as the season turns. Most days land in a mild, easygoing zone, with evenings that ease back comfortably. Comfort is usually predictable, so a standard day plan works well. Daylight is moderate, so steady pacing works well.
September in context
How it compares to the rest of the year in Whistler.
Hottest (avg)
#3 / 12
Wettest (avg)
#8 / 12
Daylight Hours
#6 / 12
Windiest (avg)
#12 / 12
Highest UV
#6 / 12
Most Humid
#7 / 12
Monthly climate breakdown
Temperature
- Daytime high
-
- Nighttime low
-
- Feels like (avg)
-
Sunshine
- Daylight hours
- 12.6 h
- UV index (max)
- 6
- Typical sun hours
- 05:48 - 18:24
Rain & Snow
- Total rain
-
- Rainy days
- 13 days
- Cloud cover (avg)
- 64%
- Snowfall
-
Humidity & Wind
- Humidity (avg)
- 77%
- Wind (avg)
-
- Wind (max gusts)
-
Daily climate explorer
Day 15 selected for September. Typical high 18.8°C and low 10.2°C.
Typical disruptions in September
Based on 30 years of historical data, these are the disruption patterns most likely to affect plans in September.
Rain High impact
Rain disruption Measures: Likely rain disruption days. Observed about 24% of days (7.3 days/month) in September. Historical risk signal only, not a day-by-day forecast.
7.3 days / month
~24% of days
Why this matters
- Expected days 7.3 days / month
- Probability ~24% of days
- Intensity Up to ~41mm (P95)
Rain disruption risk appears on ~7 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Rain High impact
Washout risk Measures: Washout day risk. Observed about 24% of days (7.3 days/month) in September. Historical risk signal only, not a day-by-day forecast.
7.3 days / month
~24% of days
Why this matters
- Expected days 7.3 days / month
- Probability ~24% of days
- Intensity Up to ~41mm (P95)
Washout conditions are possible on ~7 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Cold High impact
Cold feels-like nights Measures: Cold feels-like nights (min <=5C). Observed about 23% of days (6.8 days/month) in September. Historical risk signal only, not a day-by-day forecast.
6.8 days / month
~23% of days
Why this matters
- Expected days 6.8 days / month
- Probability ~23% of days
- Intensity Up to ~5°C (P95)
Cold feels-like nights are possible on ~7 days. Long outdoor blocks become harder to sustain, so layer up and keep a warm indoor fallback nearby.
Rain High impact
Heavy rain days Measures: Heavy rain days (>=10mm). Observed about 15% of days (4.4 days/month) in September. Historical risk signal only, not a day-by-day forecast.
4.4 days / month
~15% of days
Why this matters
- Expected days 4.4 days / month
- Probability ~15% of days
- Intensity Up to ~49mm (P95)
Heavy rain is possible on ~4 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Wind High impact
Stormy conditions Measures: Storm-impact proxy days. Observed about 10% of days (2.9 days/month) in September. Historical risk signal only, not a day-by-day forecast.
2.9 days / month
~10% of days
Why this matters
- Expected days 2.9 days / month
- Probability ~10% of days
- Intensity Up to ~89km/h (P95)
Stormy conditions are possible on ~3 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Wind High impact
Strong gusts Measures: Strong gust days (>=60 km/h). Observed about 7% of days (2.2 days/month) in September. Historical risk signal only, not a day-by-day forecast.
2.2 days / month
~7% of days
Why this matters
- Expected days 2.2 days / month
- Probability ~7% of days
- Intensity Up to ~90km/h (P95)
Strong gusts are possible on ~2 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Show all disruptions (20 more)
Rain High impact
Washout run Measures: Multi-day washout runs. Observed about 1.9 days/month in September. Historical risk signal only, not a day-by-day forecast.
1.9 days / month
Probability unavailable
Why this matters
- Expected days 1.9 days / month
- Probability —
- Intensity Up to ~43mm (P95)
Multi-day washout runs are possible on ~2 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Rain High impact
Very heavy rain Measures: Very heavy rain days (>=25mm). Observed about 3% of days (1.0 days/month) in September. Historical risk signal only, not a day-by-day forecast.
1.0 days / month
~3% of days
Why this matters
- Expected days 1.0 days / month
- Probability ~3% of days
- Intensity Up to ~64mm (P95)
Very heavy rain is possible on ~1 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Wind High impact
Severe gusts Measures: Severe gust days (>=80 km/h). Observed about 2% of days (0.5 days/month) in September. Historical risk signal only, not a day-by-day forecast.
0.5 days / month
~2% of days
Why this matters
- Expected days 0.5 days / month
- Probability ~2% of days
- Intensity Up to ~98km/h (P95)
Severe gusts are possible on ~1 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Rain High impact
Extreme rain Measures: Extreme rain days (>=50mm). Observed about 1% of days (0.2 days/month) in September. Historical risk signal only, not a day-by-day forecast.
0.2 days / month
~1% of days
Why this matters
- Expected days 0.2 days / month
- Probability ~1% of days
- Intensity Up to ~71mm (P95)
Extreme rain is possible on ~0 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Visibility Moderate
Fog-likely signal Measures: Fog-likely visibility proxy. Observed about 13% of days (4.0 days/month) in September. Historical risk signal only, not a day-by-day forecast.
4.0 days / month
~13% of days
Why this matters
- Expected days 4.0 days / month
- Probability ~13% of days
- Intensity Up to ~100% (P95)
Fog-likely conditions are possible on ~4 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Snow Moderate
Snow days Measures: Snow days (>=0.1mm snowfall). Observed about 8% of days (2.3 days/month) in September. Historical risk signal only, not a day-by-day forecast.
2.3 days / month
~8% of days
Why this matters
- Expected days 2.3 days / month
- Probability ~8% of days
- Intensity Up to ~18mm (P95)
Snowfall is possible on ~2 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Cloud Minor
Cloudy days Measures: Cloudy days (cloud cover >=60%). Observed about 61% of days (18.2 days/month) in September. Historical risk signal only, not a day-by-day forecast.
18.2 days / month
~61% of days
Why this matters
- Expected days 18.2 days / month
- Probability ~61% of days
- Intensity Up to ~100% (P95)
Cloudy skies are possible on ~18 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Rain Minor
Wet days Measures: Wet days (>=0.1mm). Observed about 50% of days (14.9 days/month) in September. Historical risk signal only, not a day-by-day forecast.
14.9 days / month
~50% of days
Why this matters
- Expected days 14.9 days / month
- Probability ~50% of days
- Intensity Up to ~28mm (P95)
Measurable rain is possible on ~15 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Rain Minor
Rainy hours Measures: Rain-hours signal (>=3h rain). Observed about 43% of days (13.0 days/month) in September. Historical risk signal only, not a day-by-day forecast.
13.0 days / month
~43% of days
Why this matters
- Expected days 13.0 days / month
- Probability ~43% of days
- Intensity Up to ~24h (P95)
Several rainy hours are possible on ~13 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Humidity Minor
High humidity Measures: High humidity days (RH >=80%). Observed about 42% of days (12.5 days/month) in September. Historical risk signal only, not a day-by-day forecast.
12.5 days / month
~42% of days
Why this matters
- Expected days 12.5 days / month
- Probability ~42% of days
- Intensity Up to ~99% (P95)
High humidity is possible on ~13 days. Comfort and pace can drop quickly, so plan shorter outdoor blocks with air-conditioned backup stops.
Cloud Minor
Mostly cloudy days Measures: Mostly cloudy days (cloud cover >=80%). Observed about 41% of days (12.2 days/month) in September. Historical risk signal only, not a day-by-day forecast.
12.2 days / month
~41% of days
Why this matters
- Expected days 12.2 days / month
- Probability ~41% of days
- Intensity Up to ~100% (P95)
Mostly cloudy skies are possible on ~12 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Rain Minor
Wet most of day Measures: Wet-most-of-day signal (>=6h rain). Observed about 36% of days (10.7 days/month) in September. Historical risk signal only, not a day-by-day forecast.
10.7 days / month
~36% of days
Why this matters
- Expected days 10.7 days / month
- Probability ~36% of days
- Intensity Up to ~24h (P95)
Wet-most-of-day conditions are possible on ~11 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Wind Minor
Gusty days Measures: Gusty days (>=40 km/h). Observed about 33% of days (10.0 days/month) in September. Historical risk signal only, not a day-by-day forecast.
10.0 days / month
~33% of days
Why this matters
- Expected days 10.0 days / month
- Probability ~33% of days
- Intensity Up to ~82km/h (P95)
Gusty conditions are possible on ~10 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Cloud Minor
Overcast days Measures: Overcast days (cloud cover >=95%). Observed about 19% of days (5.6 days/month) in September. Historical risk signal only, not a day-by-day forecast.
5.6 days / month
~19% of days
Why this matters
- Expected days 5.6 days / month
- Probability ~19% of days
- Intensity Up to ~100% (P95)
Overcast skies are possible on ~6 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Other Minor
Low visibility proxy: same as fog-likely (RH ≥90% AND cloud ≥95%) — true visibility requires hourly visibility data Measures: Low visibility proxy: same as fog-likely (RH ≥90% AND cloud ≥95%) — true visibility requires hourly visibility data. Observed about 13% of days (4.0 days/month) in September. Historical risk signal only, not a day-by-day forecast.
4.0 days / month
~13% of days
Why this matters
- Expected days 4.0 days / month
- Probability ~13% of days
- Intensity Up to ~100 (P95)
Low visibility proxy: same as fog-likely (RH ≥90% AND cloud ≥95%) — true visibility requires hourly visibility data is possible on ~4 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Cold Minor
Cold nights Measures: Cold nights (min <=5C). Observed about 9% of days (2.7 days/month) in September. Historical risk signal only, not a day-by-day forecast.
2.7 days / month
~9% of days
Why this matters
- Expected days 2.7 days / month
- Probability ~9% of days
- Intensity Up to ~5°C (P95)
Cold nights are possible on ~3 days. Long outdoor blocks become harder to sustain, so layer up and keep a warm indoor fallback nearby.
Cold Minor
Cold days Measures: Cold days (max <=10C). Observed about 4% of days (1.3 days/month) in September. Historical risk signal only, not a day-by-day forecast.
1.3 days / month
~4% of days
Why this matters
- Expected days 1.3 days / month
- Probability ~4% of days
- Intensity Up to ~10°C (P95)
Cold daytime conditions are possible on ~1 days. Long outdoor blocks become harder to sustain, so layer up and keep a warm indoor fallback nearby.
Other Minor
Heavy snowfall (INACTIVE until snowfall_sum units confirmed; set threshold once units are verified) Measures: Heavy snowfall (INACTIVE until snowfall_sum units confirmed; set threshold once units are verified). Observed about 1% of days (0.4 days/month) in September. Historical risk signal only, not a day-by-day forecast.
0.4 days / month
~1% of days
Why this matters
- Expected days 0.4 days / month
- Probability ~1% of days
- Intensity Up to ~39 (P95)
Heavy snowfall (INACTIVE until snowfall_sum units confirmed; set threshold once units are verified) is possible on ~0 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Heat Minor
Hot days Measures: Hot days (>=30C). Observed about 1% of days (0.2 days/month) in September. Historical risk signal only, not a day-by-day forecast.
0.2 days / month
~1% of days
Why this matters
- Expected days 0.2 days / month
- Probability ~1% of days
- Intensity Up to ~33°C (P95)
Hot days are possible on ~0 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options.
Cold Minor
Cold snap run Measures: Cold snap runs (>=3 cold days). Observed about 0.1 days/month in September. Historical risk signal only, not a day-by-day forecast.
0.1 days / month
Probability unavailable
Why this matters
- Expected days 0.1 days / month
- Probability —
- Intensity Up to ~10°C (P95)
Cold snap runs are possible on ~0 days. Long outdoor blocks become harder to sustain, so layer up and keep a warm indoor fallback nearby.
Frequently asked questions
Is September a good time to visit Whistler?
Typical September days in Whistler reach highs of 18°C (64°F) with nights around 9°C (48°F). It usually feels mild by day and cool after dark. Overall, September sits in the middle of the Whistler climate range.
What are temperatures like in September?
In September, you can usually expect highs of 18°C (64°F) and lows near 9°C (48°F). That means mild days and cool nights, so pack layers you can add or remove.
How much does it rain in September?
Rainfall in September averages 128 mm (5.0 in) across roughly 13 days. Overall it is a quite rainy time of year, so a light rain jacket and waterproof shoes are very handy.
How many hours of daylight are there in September?
You can expect about 13 hours of daylight in September. Sunrise is typically around 05:48 and sunset near 18:24. Daylight is fairly typical, with enough time for sightseeing.
How strong is the sun in September?
UV levels are often high (around 6). Regular sunscreen and a hat are recommended.
Is it windy in September?
In September, average wind speeds are around 4 km/h (2 mph), with gusts on the windiest days reaching about 56 km/h (35 mph). On the ground, it is it can feel quite windy at times, particularly when weather systems move through.